2023 Commercial Electrical Inspector – Flashcards

What means is permitted for capacitor overcurrent protection in induction and dielectric heating equipment?

What specific requirement must abandoned Optical Fiber Cables meet?

Which method is acceptable for determining the suitability of identified equipment for Zone 20, 21, and 22 locations?

No wall-mounted luminaire in a swimming pool shall be installed less than what minimum depth below the normal water level?

Raceways or cable trays containing electrical conductors shall not contain any pipe, tube, or equal for what other service?

Single-throw knife switches and switches with butt contacts must be connected so that their blades or terminals supplying the load are de-energized when the switch is in which position?

For what size HDPE conduit must the allowable radii of bends be in accordance with specifications provided by the manufacturer?

Is explosionproof equipment required in Class II locations?

The requirements of this Code address the fundamental principles of protection for safety contained in which International Electrotechnical Commission standard?

Openings around electrical penetrations into or through fire-resistant-rated walls, partitions, floors, or ceilings must be firestopped using approved methods to maintain what?

What is required to be provided to prevent contact with nonshielded cables or energized parts of oil-filled cutouts?

When the distribution equipment supplied by the feeder is replaced, what requirement applies regarding surge protection?

Luminaire studs that are not part of outlet boxes, hickeys, tripods, and crowfeet must be made of steel, malleable iron, or what other quality of material?

What documentation requirement must be field marked on the exterior of the transfer equipment enclosure for a Legally Required Standby System?

When must each run of cable tray be completed?

How much of the nonheating lead at the splice between the heating cable and nonheating leads must be embedded in plaster or dry board in the same manner as the heating cable?

Horticultural lighting equipment shall not be installed where it is likely to be subject to physical damage or where it is what?

In a recreational vehicle park, if direct-buried conductors or cables enter or leave a trench, what is the minimum distance the required protection must extend into the trench from finished grade?

Storage battery charging equipment in Class III locations must be located in separate rooms constructed to prevent the entrance of ignitible amounts of flyings or lint and must also be what?

For fixed electric space-heating equipment consisting of motors over 1/8(hp) and other loads, the marking shall specify the motor rating in volts, amperes, and frequency, and the heating load in volts and watts or in which other rating unit?

What additional information must be included in the marking on each length of RTRC unless it is visually identifiable?

Systems operating at 30 volts ac or less or 60 volts dc or less must be listed as what?

Where equipment grounding is required in an ENT system, what must be installed?

For conductors 14 AWG, what is the maximum number of Type THHN conductors permitted in metric designator 12 (trade size 3/8) FMC when using fittings inside the conduit?

For horizontal runs of RTRC supported by openings through framing members, they must be securely fastened within what maximum distance of termination points?

For multigrounded neutral primary systems using a spark gap or listed device for interconnection, what is the maximum required 60-Hz breakdown voltage?

Each service disconnect must be permanently marked to identify it as what?

Equipment receptacles rated at 125 volts, single phase, 15 and 20 amperes must be switched, and the mechanical ventilation system shall be electrically interlocked through which component?

SPDs must be located indoors or outdoors and shall be made inaccessible to unqualified persons unless they are what?

For the neutral conductor of feeders supplying solid-state phase control, 3-phase, 4-wire dimmer systems, how shall the neutral conductor be considered for purposes of ampacity adjustment?

Contact wires must be mounted on approved insulators so that the extreme limit of displacement of the wire does not bring the latter within less than what distance from the surface wired over?

Arc-fault circuit-interrupter type and ground-fault circuit-interrupter type replacement receptacles shall be installed in what type of location?

In Class I, Division 1 locations, cables shall be sealed at all terminations with sealing fittings installed within what maximum distance of the enclosure?

How frequently must EMT be clearly and durably marked?

In industrial establishments, which specific conductor types are permitted in messenger-supported wiring?

If a fuse associated with ESS equipment is energized from both directions and is accessible to other than qualified persons, what must be provided to disconnect the fuse from all sources of supply?

Outlets serving which specific equipment are permitted to be waived from branch-circuit load calculations?

Under an AEGCP, which component must be tested for continuity and correct attachment of the equipment grounding conductor?

What specific part of a ground-mounted Solar PV array is permitted to be considered a grounding electrode if it meets the requirements of 250.52?

Fixture wires other than thermoplastic insulated types must be marked by means of a printed tag attached to which item?

When installing portable switchboards, stage set lighting, or stage effects wiring using flexible cords and cables, what specific fastening method is prohibited?

Can remote controlled temperature-actuated devices serve as the disconnecting means for fixed outdoor deicing and snow-melting equipment?

What is the required volume allowance for each nonmetallic barrier securely installed in a box, if the barrier is not marked with its volume?

For Type PLTC-ER cable used in industrial establishments where the cable is not subject to physical damage, what is the maximum transition distance permitted without continuous support when moving between cable trays?

Fixed outdoor electric deicing and snow-melting equipment shall be considered what type of load?

For storage batteries and UPS supplying standby illumination in a Legally Required Standby System, what is the minimum duration the total load must be maintained without the voltage falling below 87 1/2 percent of nominal voltage?

For a large-scale PV electric supply station, where must the fence grounding requirements and details be included?

What is the minimum nominal insulation thickness in mils for Type HF ECTFE fixture wire?

The electrolytic cell line working zone encompasses space within what horizontal distance from energized surfaces of electrolytic cell lines or their energized attachments?

In addition to the requirements of 210.8(B), which specific receptacle outlets installed in relocatable structures must have GFCI protection for personnel?

What specific type of transformer is explicitly prohibited from being used in the electrical system of a park trailer?

If a roof surface is subject to pedestrian traffic, the vertical clearance for overhead conductors shall be maintained in accordance with which section?

What is the minimum required size for individual service-entrance conductors (not in multiconductor cable) used on circuits over 1000 volts?

Where Type AC cable is run from the last point of cable support to the point of connection to a luminaire or other electrical equipment, what is the maximum unsupported length permitted if the cable and connection point are within an accessible ceiling?

A germicidal irradiation system intended to safeguard against UV exposure by ensuring a building space will not be occupied during operation must be listed and identified as what?

The primary overcurrent protective device(s) for a transformer supplied by an individual source serving a fire pump shall be selected or set to carry indefinitely the sum of the locked-rotor current of the fire pump motor(s), the pressure maintenance pump motor(s), the full-load current of the associated fire pump accessory equipment, and what other load?

What documentation requirement must be field marked on the exterior of the transfer equipment enclosure for an Emergency System?

In unclassified anesthetizing locations, receptacles and attachment plugs must be listed as what specific grade?

The ampacity of the branch-circuit conductor(s) supplying fixed electric space-heating equipment shall not be less than what percentage of the load of the equipment and any associated motor(s)?

What must be installed for critical operations data systems in accordance with Part II of Article 242?

Locations are classified based on the properties of the material and what other primary factor?

Where must the remote emergency stop switch for generators over 15(kW) (other than one- and two-family dwellings) be located?

For dipping, coating, and printing processes, the space 3 ft. above the floor and extending 20 ft. horizontally in all directions from the Division 1 or Zone 1 location shall be classified as what?

Fixed industrial process heating equipment subject to physical damage must be protected in what manner?

In other than one- and two-family dwellings, where must a sign be placed for an Optional Standby Power Source?

Low-voltage lighting systems covered by Article 411 must be supplied from a maximum branch circuit rating of what size?

The restriction to 80 percent of the rating for an enclosed overcurrent device for continuous loads shall NOT apply to overcurrent devices installed in systems operating at what minimum voltage?

Securing or supporting of LFNC is NOT required when installed in lengths not exceeding what distance at terminals where flexibility is required?

Conductors passing above the overhanging portion of a roof may have a clearance reduced to not less than 450 mm (18 in.) if the voltage does not exceed 300, and no more than what horizontal distance of the conductors passes above the overhang?

If fluorescent or LED luminaires (double-ended lamps) are connected to multiwire branch circuits, the disconnecting means must simultaneously break which conductors?

For primary and secondary protection of transformers 1000Volts or less, where the transformer is equipped with coordinated thermal overload protection arranged to interrupt the primary current, what is the maximum primary current rating permitted for a transformer having not more than 6 percent impedance?

Where a crane operates over readily combustible material, the resistors are permitted to be located in a cage constructed of noncombustible material that encloses the sides of the cage from the floor to a point at least how far above the top of the resistors?

Which specific electrical supply source is not considered a reliable diversion load for regulating the speed of a wind turbine rotor?

How is a nonflammable dielectric fluid defined for the purposes of 450.24?

If the door of a metal cabinet is lined with an approved insulating material, what is the minimum required airspace between live metal parts and the door?

If an electrode boiler is rated 50(kW) or more, the conductors supplying the boiler electrode(s) are permitted to be sized at not less than 100 percent of the nameplate rating, provided a temperature- or pressure-actuated device controls which operation?

Where the rating specified in Table 430.52(C)(1) is not sufficient for the starting current of the motor, the rating of a nontime-delay fuse not exceeding 600(amperes) is permitted to be increased, but shall in no case exceed what maximum percentage of the full-load current?

In industrial establishments, if the cord or cable between the busway plug-in device and the tension take-up support device exceeds 1.8 m (6 ft), what is the maximum support interval required for the cord or cable?

Intrinsically safe circuits shall be identified at terminal and junction locations in a manner that is intended to prevent what?

Overcurrent protective devices, other than supplementary overcurrent protection, are prohibited from being located where?

Germicidal irradiation luminaires are prohibited from being installed in a dwelling unless what conditions are met?

For simple apparatus components with a total surface area ge 20text{ mm}^{2} and less than or equal to 10text{ cm}^{2} (excluding lead wires), what is the maximum surface temperature permitted for T4 classification according to Table 504.10(text{D})?

Trench-type flush raceways with removable covers are permitted to be laid flush with the floor surface, provided the cover plates offer adequate mechanical protection and rigidity equivalent to what?

What is the restriction on the branch circuit serving Emergency Systems lighting and power circuits?

When installing surface-type enclosures in damp or wet locations, what is the minimum required airspace between the enclosure and the supporting surface?

For installations under single management, the disconnecting means is permitted to be located elsewhere on the premises, provided the installation is monitored by which individuals?

GFCI protection for appliances shall be readily accessible, listed, and located in one of five locations. Which of the following is not one of the permitted locations?

Which of the following is a permitted use for flexible bus systems?

Flexible power cords and cables shall not be used for connection to what?

For a swimming pool water heater rated at more than 50 amperes and having specific instructions regarding bonding, which parts shall be bonded?

When calculating conductor fill, an unbroken loop or coil of conductor must be counted twice if it is not less than what minimum length?

Documentation classifying areas as hazardous or unclassified must be made available to the AHJ and whom else?

For motors 275 (mm)/ 11 (in) in diameter or less, rated 10(hp) or 15(hp) , what is the minimum cover opening dimension for the terminal housing that encloses wire-to-wire connections?

What is the minimum requirement for a GFCI-protected receptacle in an equipment room serving a swimming pool?

For a solidly grounded neutral system operating at 4160 volts, the insulated grounded conductor must have an insulation rating of not less than what voltage?

If listed or field-labeled equipment is unavailable for a large-scale PV electric supply station, what alternative method is permitted for equipment approval?

For connections within an accessible ceiling to a luminaire(s) or other equipment, what is the maximum length of unsecured FMC permitted from the last point where the raceway is securely fastened?

For center pivot irrigation machines, the equivalent locked-rotor current rating shall be equal to the numerical sum of two times the locked-rotor current of the largest motor plus what percentage of the sum of the motor nameplate full-load current ratings of all the remaining motors on the circuit?

Where a fuse in a wind electric system is energized from both directions and accessible to other than qualified persons, what must be provided to disconnect the fuse from all sources of supply?

In a combination electrical system within a recreational vehicle, circuits fed from AC transformers are not permitted to supply what type of appliance?

The rating of an adjustable-trip circuit breaker having external means for adjusting the current setting (long-time pickup setting), not meeting the requirements of 240.6(C), shall be considered what value?

In Class I, Division 2 hazardous locations, the cord used for flexibility to moving parts of a crane must be approved for what minimum usage rating?

A flame arrester prevents destruction of the cell due to ignition of gases within the cell by what?

Is HDPE conduit permitted to be installed in cinder fill?

What clearance must be secured between bare current-carrying metal parts and any metal surface in an auxiliary gutter?

A recreational vehicle with two to five 15- or 20-ampere branch circuits shall be equipped with a panelboard listed for what minimum application rating?

Plug-in-type overcurrent protection devices that are backfed must be secured in place by an additional fastener that requires which specific action to release the device from the mounting means on the panelboard?

For an individual seam welder that can be operated at different values of primary current or duty cycle, the ampacity of the supply conductors shall be not less than what percentage of the rated primary current?

If a portable stage switchboard contains a feed-through outlet of the same rating as its supply inlet, what is not required for that feed-through outlet?

What is the minimum operating temperature rating required for the insulation of conductors used for connections between resistance elements and controllers?

Equipment for outdoor electric deicing and snow melting must be identified as suitable for the environment and installed in accordance with which instructions?

If an Emergency System load is supplied by a single feeder, what provision must the system include to facilitate maintenance without jeopardizing continuity of power?

Low-voltage interior luminaires in a park trailer rated more than 4 watts, employing lamps rated more than 1.2 watts, must meet what requirement?

A 250 kcmil three-conductor portable cable rated 8001 to 15,000 Volts has a listed ampacity of:

The overcurrent protection for the runway supply conductors and main contact conductors shall not be greater than the largest rating or setting of any branch-circuit protective device plus the sum of the nameplate ratings of all the other loads with application of what factors?

Each luminaire or each secondary circuit of tubing having an open-circuit voltage of over 1000 Volts must have a clearly legible marking in letters not less than what minimum height?

Ground-fault protection of equipment is NOT required for a feeder disconnect rated 1000 amperes or more if the feeder supplies what type of load, where a nonorderly shutdown will introduce additional hazards?

When are straight LFMC fittings permitted for direct burial?

What column in Table 2, Chapter 9, shall be used to determine the minimum radius of the curve to the centerline of any bend in LFNC?

What is the minimum required ampacity for the grounded conductor of a 3-phase, 3-wire delta service?

Circuit breakers used for overcurrent protection of 3-phase circuits shall have a minimum of how many overcurrent relay elements?

If the disconnecting means for air-conditioning or refrigerating equipment is readily accessible to unqualified persons, what must be true about any enclosure door or hinged cover that exposes energized parts when open?

Which type of piping is not permitted in dedicated battery rooms?

When installing Class 1 Circuits and power-supply circuits in the same enclosure or raceway, under what condition is a barrier not required for separation?

What is the minimum thickness required for a grounded metal partition used to separate intrinsically safe and nonintrinsically safe circuits in raceways, cable trays, or cables?

Nonmetallic cable ties and other nonmetallic cable accessories used in other spaces used for environmental air (plenums) must be listed as having what properties?

The requirements of 555.33 concerning receptacle location and type shall apply to which specific type of work?

A meter disconnect switch installed on the supply side of the service disconnect, nominally rated not in excess of 1000 volts, must be legibly field marked on its exterior with what mandatory statement?

What type of devices are permitted for detecting and interrupting fault current in capacitor circuits over 1000 Volts?

How shall a Cablebus system be connected to grounding components?

Which of the following is NOT a permitted wiring method for flexible connections to motors and similar equipment on cranes and hoists?

Transformer top surfaces that are horizontal and readily accessible must be marked to prohibit what?

Guest rooms or guest suites in hotels, motels, and assisted living facilities that are provided with permanent provisions for cooking must have branch circuits installed to meet the rules for which occupancy type?

In recreational vehicle parks, GFCI protection shall only be required for what specific rating of receptacles installed in the recreational vehicle site equipment?

At least how many receptacle outlets must be located outdoors, accessible at grade level, and not more than 2.0 (m) / 6 frac{1}{2}(ft.) above grade on a mobile home?

At least how many of the disconnecting means in a motor circuit must be readily accessible?

Where marked on the equipment, what current is used instead of the rated-load current to determine the rating or ampacity of the disconnecting means, the branch-circuit conductors, the controller, and the branch-circuit short-circuit and ground-fault protection?

The optional school calculation method (220.86) shall NOT apply to which buildings?

Except for multiwire circuits tapped at the load end, all conductors of a multiwire branch circuit shall originate from which location?

What is the minimum required size for overhead service conductors made of aluminum?

Surface-mounted electric-discharge and LED luminaires designed not to be supported solely by the outlet box must be provided with suitable openings for what purpose?

Horizontal runs of Type AC cable installed in wooden or metal framing members shall be considered secured and supported if the support intervals do not exceed what maximum distance?

What shall be used as the grounding electrode for a separately derived system?

Which type of metal-covered multiconductor cable is specifically exempted from the requirement to use a marker tape located within the cable?

Emergency disconnects required for one- and two-family dwelling units must be installed in a readily accessible outdoor location on or within sight of the dwelling unit. What is the minimum required short-circuit current rating?

What is required for Type AC cable and its associated fittings?

In two-family dwellings, where is the other disconnecting means permitted to be located if a unit switch is used as the appliance disconnecting means?

The location of luminaires in battery spaces must not result in exposing personnel to energized battery components while performing maintenance on the luminaires in the battery space or what other hazard?

Wall-mounted ovens and counter-mounted cooking units must be permitted to be permanently connected or connected using what other means?

For an irrigation machine with inherent intermittent duty, how is the equivalent locked-rotor current rating calculated for the largest two motors?

What is the accessibility requirement for the branch-circuit overcurrent devices in Legally Required Standby Systems?

Where a premises wiring system has feeders supplied from more than one nominal voltage system, the ungrounded conductors must be identified by phase or line and system at all termination, connection, and splice points. Which identification method is permitted?

In other than one- or two-family dwellings, switchboards, switchgear, and panelboards supplied by a feeder(s) must be permanently marked with the identification and physical location of which element?

In Zone 22 locations, Type PLTC-ER cable is permitted, provided it includes what specific conductor type in addition to a drain wire that might be present?

The conductors installed within the track housing must be what minimum AWG size or equivalent, and made of what material?

Sheet steel boxes not over 1650 cm³ (100 in.³) in size shall be made from steel not less than what minimum thickness?

Which of the following locations is explicitly prohibited for the installation of heating cables?

The optional dwelling unit calculation (220.82) is permitted only if the single set of service or feeder conductors has an ampacity of what minimum value?

What is the minimum required vertical clearance for working space provided in accordance with 110.34, to ensure conductors in boxes over 1000 volts are accessible?

Are disconnecting means for individual motors and controllers on an irrigation machine required to be readily accessible?

Cord-and-plug-connected luminaires must comply with 680.8 if installed within what radial distance of any point on the swimming pool water surface?

What is the minimum trade size required for conduit or tubing used for neon secondary-circuit wiring over 1000 volts?

All fixed wiring in a hangar but not installed in a Class I location as classified in 513.3 shall be installed in metal raceways or shall be what types of cable?

What is the ampacity for 4/0 AWG bare AAC aluminum conductors in free air, based on 80°C total conductor temperature and 40°C ambient temperature?

Meter sockets supplied by and under the exclusive control of an electric utility are NOT required to be listed. True or False?

Overcurrent protection is not required to comply with Article 240 for which specific circuit within an electrolytic cell system?

Group E combustible dust atmospheres contain what type of metal dusts and their commercial alloys?

Where outside heating, air-conditioning equipment, or both, are supplied by a branch circuit, the conductors shall terminate in a listed outlet box or disconnecting means located where?

How must all feeders and branch-circuit conductors in a 60/120-volt system be identified at all splices and terminations?

Electrical nonmetallic tubing (ENT) and rigid nonmetallic conduit (RNC) are permitted to be installed concealed within walls, floors, and ceilings in certain spaces (like club rooms or courtrooms) provided the thermal barrier material has at least what minimum finish rating?

What type of stage switchboard contains only overcurrent protective devices and no control elements?

Where power is needed for fuel transfer pumps to deliver fuel to the source of a Legally Required Standby System, these pumps must be connected to what system?

Which wiring method is permitted to be installed in exposed or concealed locations under metal-corrugated sheet roof decking without maintaining the 38 mm (1 1/2 in.) spacing requirement?

For two-family dwellings where a fixed heater uses a unit switch as the disconnecting means, the other disconnecting means is permitted to be located where?

For mobile/portable high-voltage equipment, the branch-circuit protective device(s) shall provide short-circuit and locked-rotor protection and shall be permitted to be located where?

Where a required fuse or nonadjustable circuit breaker rating does not correspond to a standard rating, what rating or setting is permitted?

Luminaires located within the actual outside dimension of the bathtub or shower to a height of 8 ft. must be marked suitable for damp locations or what other marking?

When using a flexible cord for interconnection between office furnishings, what is the maximum length permitted for the cord?

What is the requirement regarding the grounding of the conductive surfaces of cranes and hoists that enter the cell line working zone?

What is the minimum required melting point for the sealing compound used in seals for Zone locations?

What must be provided as part of the heated length for heating cables installed under floor coverings?

If wet contact is likely to occur, what is the maximum permissible operating voltage for low-voltage lighting systems using direct current (dc)?

Which of the following luminaire types is not permitted in a clothes closet?

Which type of batteries are exempt from the listing requirement for stationary standby batteries?

What is the maximum ampacity permitted for 600 kcmil and larger single-conductor cables in uncovered cable trays?

What is the maximum temperature, at any location along its length, that a conductor can withstand over a prolonged time period without serious degradation, as referred to in an informational note?

When a box or conduit body is recessed into a finished surface, the access opening for internal contents of a box 1650 cm³ (100 in.³) or less must be centered not more than what maximum distance from the centerline of the box?

What is the minimum cover requirement for direct-buried cables or conductors (Column 1) in all locations not specifically detailed in Table 300.5(A)?

Fuses that expel flame in opening the circuit shall be designed or arranged so that they function properly without hazard to what?

In industrial installations only, secondary conductors not over 7.5 m (25 ft) long are permitted without protection at the secondary connection if the sum of the ratings of the overcurrent devices does not exceed what value?

If motor control circuit conductors extend beyond the motor control equipment enclosure, what is the maximum rating permitted for the protective device(s) when using 14 AWG copper conductors, if protected by the motor branch-circuit short-circuit and ground-fault protective device?

When a farm dwelling has electric heat and the farm has electric grain-drying systems, which Part shall NOT be used to calculate the dwelling load where dwelling and farm loads share a common service?

Where a cable or raceway passes through bored holes in wood members, the edge of the hole must be not less than what minimum distance from the edge of the wood member?

Where equipment operating at 1000 volts or less is located in a crawl space with limited access, what is the minimum size of the accessible opening required?

What is the minimum length of free nonheating lead required within the junction box for embedded equipment?

Luminaires installed on suspended ceiling systems must be securely fastened to the ceiling framing member by mechanical means, such as bolts, screws, or rivets, or by using what other method?

For back-in sites in a recreational vehicle park, the site electrical supply equipment must be located on the left (road) side of the parked vehicle, on a line that is 1.5 (m) to 2.1 (m) / 5text{ ft} to 7(ft.) from the left edge of the recreational vehicle stand, and located at any point on this line from the rear of the stand to what maximum distance forward?

A resistance-type boiler employing heating elements not contained in an ASME-rated and stamped vessel must have the heating elements protected at not more than what maximum ampere rating?

For a fire pump motor contactor actuation, what type of sensor is explicitly prohibited from being installed if it automatically or manually prohibits actuation?

Cablebus shall be protected against overcurrent in accordance with the ampacity of the cablebus conductors as specified in which NEC section?

Portable EVSE is permitted to connect to premises wiring by a nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated at 60 volts dc maximum, and which ampere ratings?

When cutting through the raceway wall and setting inserts, what tool design restriction applies?

What is the minimum fixture wire size permitted for control and operating circuits of X-ray and auxiliary equipment, provided they are protected by not larger than 20-ampere overcurrent devices?

Temporary electric power and lighting installations are permitted for which of the following specialized purposes?

Which type of Solar PV mating connector is required to be marked “Do Not Disconnect Under Load” or “Not for Current Interrupting”?

In a Class I, Division 2 location, where switches, circuit breakers, motor controllers, and fuses are intended to interrupt current, general-purpose enclosures are permitted if the current make-and-break contacts are oil-immersed with a minimum immersion of what depth for power contacts?

What is the maximum temperature rating that conductors in outlet boxes supplying luminaires shall be subjected to?

For a vault ventilated by natural circulation of air to an outdoor area, what is the minimum combined net area of all ventilating openings required per kVA of transformer capacity in service?

For circuits rated over 1000 Volts, resistors and reactors must be protected against what?

What is the minimum rating (hp or watts) for kitchen equipment that is fastened in place (other than cooking, heating, cooling) and is included in the calculations of 220.56?

Tap conductors on a 40-ampere branch circuit that supply individual outlets (other than receptacle outlets) must have an ampacity of not less than 20 amperes and a maximum length of what dimension?

The required surge-protective device (SPD) must be an integral part of the service equipment or located where?

Hoist functions protected by thermal sensing devices shall be considered protected if the sensing device limits the hoist to which action during an overload condition?

Receptacle outlets in a park trailer shall be installed at wall spaces 2 ft. wide or more so that no point along the floor line is more than what maximum horizontal distance from an outlet in that space?

When a permanently installed swimming pool is installed, the required 125-volt, 15- or 20-ampere general-purpose receptacle must be located not more than what maximum horizontal distance from the inside wall of the pool?

What requirement applies to CI (Circuit Integrity) cables installed in free air to maintain their listed fire rating?

When control conductors are spliced, terminated, or connected in the same luminaire as the branch-circuit conductors, the field-connected control conductor shall not be of a color reserved for which two specific conductors?

For neon secondary-circuit wiring of 1000 volts or less, conductors shall be listed, insulated, and not smaller than which size?

What type of conduit bodies are only intended to enable the installation of the raceway and contained conductors, and therefore shall not contain splices, taps, or devices?

What is the maximum distance permitted from the attachment plug that a GFCI device may be located if installed within the supply cord?

Enclosures for overcurrent devices shall generally be mounted in a vertical position, but listed busway plug-in units are permitted to be mounted in which orientation?

For RTRC intended for use aboveground, what characteristic is required regarding heat?

If 10 household ranges are individually rated 15 kW (over 12 kW but not over 27 kW), what is the required increase in maximum demand percentage over the Column C value for 10 ranges (25 kW)?

When transposing cable size into raceway size for a multioutlet assembly used as a pull box, which size raceway is used to determine bending space requirements?

If the required disconnecting means for high-rated EVSE is installed remote from the equipment, what must be installed on the equipment?

The bonding conductor used to connect parts of an equipotential plane shall be what size and material?

What is the maximum interval permitted for supporting flexible insulated bus conductors on identified mounting means for vertical runs?

What is the maximum number of 15- or 20-ampere circuits permitted to supply lights, receptacles, and fixed appliances in a park trailer using a 30-ampere-rated feeder assembly without an energy management system?

For powder coating processes, portable electric luminaires or other utilization equipment used during cleaning or repairing operations must be of a type identified for what hazardous location?

When an outlet is abandoned or removed, what must be done with the circuit conductors supplying the outlet?

For circuits containing an ESS diversion charge controller and a diversion load, what is the minimum required ampacity for the conductor and rating of the overcurrent device?

The nameplate for capacitors over 1000 Volts must include the volume of liquid identified as what, if such is the case?

What is the exception to the requirement that capacitor cases must be connected to the equipment grounding conductor?

Is a multioutlet assembly permitted where concealed?

Which of the following is a prohibited use for HDPE conduit?

Luminaires equipped with a flanged surface inlet shall be permitted to be supplied by cord pendants equipped with cord connectors. The ampere rating of the inlets and connectors must not be less than what percentage of the luminaire load current?

For loading tank vehicles or tank cars through closed dome with vapor control, what is the classification of the area within 3 ft. of the point of connection of both fill and vapor lines?

Where rear access is required only to work on nonelectrical parts on the back of enclosed dead-front equipment rated 1000 volts or less, what is the minimum horizontal working space required?

Which specific occupancies are excluded from the requirement for commissioning of Energy Storage Systems (ESS) upon installation?

What is the minimum required height for the letters in the marking “Fire Pump Disconnecting Means” on the disconnecting means enclosure?

How many 120-volt, 20-ampere branch circuits must be provided to supply the required bathroom receptacle outlet(s) and any countertop and similar work surface receptacle outlets in a dwelling unit?

A single installation of surge arresters is permitted to protect a number of interconnected circuits if no circuit is exposed to surges while disconnected from what device?

For PVC conduit installed in wet locations, what is required for all supports, bolts, straps, screws, and so forth?

Where resistance-type boilers are rated 50(kW) or more, the conductors supplying the supplementary overcurrent protective devices can be sized at 100 percent of the nameplate rating if what type of device controls the cyclic operation?

Circuits exceeding what nominal voltage between conductors are only permitted to supply utilization equipment in installations where conditions of maintenance and supervision ensure that only qualified persons service the installation?

Overload protection specified in Part VI of Article 440 is intended to protect the motor-compressor, the motor-control apparatus, and the branch-circuit conductors against excessive heating due to motor overload and what other condition?

Exposed vertical risers from industrial machinery or fixed equipment are permitted to be supported at intervals not exceeding what distance, provided the conduit is supported and securely fastened at the top and bottom of the riser?

The equipment grounding conductor must be connected to the system grounded conductor at the service disconnecting means or, in the case of a separately derived system, at what two locations?

All lamps for general illumination in a temporary installation shall be protected from accidental contact or breakage by which means?

Temporary wiring shall be removed immediately upon completion of which condition?

What is the minimum height required for the block-type letters used for the mandatory warning marking on covers for boxes over 1000 volts?

Reconditioned lampholders are permitted for use under which condition?

Class 2 cable used on the load side of a Class 2 power source for sign illumination shall have an ampacity not less than the load and shall not be sized smaller than which AWG size?

A switchboard containing an ungrounded ac electrical system must be permanently field marked with a caution label indicating the voltage between which components?

Additional feeders or branch circuits are permitted to supply installations under single management where what procedure is established and maintained?

Where individual open conductors enter a building, they shall enter through the wall in an upward slant through individual, noncombustible, nonabsorbent insulating tubes, and what must be formed on the conductors before they enter the tubes?

All metal raceways, metal armor/sheath on cables, and all non–current-carrying metal parts of fixed or portable electrical equipment, regardless of voltage, shall be what?

In Class I, Division 2 locations, what condition must listed threaded or threadless fittings meet when used with Rigid Metal Conduit (RMC) or Intermediate Metal Conduit (IMC)?

Conductors external to motors and controls shall be not smaller than which size?

What is the minimum required thickness for plastic laminates used for required safety labels in a park trailer?

When Type AC cable (with 90°C conductors) is installed in thermal insulation, the final ampacity calculation shall not exceed that of a conductor rated at what temperature?

A switch or circuit breaker is permitted to disconnect a grounded circuit conductor only if what condition is met?

What type of wiring is prohibited within a commercial cooking hood when supplying a luminaire?

Where an orderly shutdown is required to minimize hazards to personnel or equipment, a system of coordination may be permitted based on coordinated short-circuit protection and what other condition?

For service conductors over 1000 volts, a circuit breaker providing short-circuit protection must have a trip setting of not more than how many times the ampacity of the conductors?

Splices and taps made within the IMC system shall comply with the requirements of which NEC section?

If a screw penetrates the wall of a box not exceeding 1650 cm³ (100 in.³) and is not covered in 314.23(B)(1), how must it be installed?

What form of protection shall be provided to prevent physical damage to the raceway or cable during backfill?

What characteristic must strut-type channel raceways and accessories possess?

In printing processes, provision shall be made to dissipate static electric charges from what components?

For an instantaneous-trip circuit breaker used with motors other than design B energy-efficient and Design B premium efficiency motors, if the setting specified in Table 430.52(text{C})(1) is not sufficient, the setting shall be permitted to be increased but shall in no case exceed what maximum percentage of the motor full-load current?

Which of the following wiring methods is limited to a maximum length of 1.8 m (6 ft) when used for service-entrance conductors?

Single insulated conductors are permitted for temporary feeder installations if used for emergencies, tests, experiments, or developmental work, provided they are accessible only to which personnel?

What type of thread is prohibited from being used on RMC for connection at couplings?

If embedded units, panels, or cables are installed over other identified bases, what is the maximum thickness they shall be embedded within the concrete, masonry, or asphalt?

What must each generator nameplate provide regarding rating, in addition to manufacturer’s name, frequency, number of phases, power factor, and normal volts and amperes?

The receptacle supplying power to cord- and plug-connected freestanding office furnishings must be on a separate circuit serving only the office furnishing and located no more than what distance from the office furnishing?

The ampacity of conductors connecting a capacitor to the terminals of a motor or motor circuit conductors shall not be less than one-third the ampacity of the motor circuit conductors and in no case less than what percentage of the rated current of the capacitor?

Non–power-limited control power sources, other than transformers, shall be protected by overcurrent devices rated at not more than what percentage of the volt-ampere rating of the source divided by the rated voltage?

What restriction applies to the size of conductors installed in any nonmetallic wireway?

Where multiconductor cable is used with a suspended pushbutton station, the station shall be supported in a manner that protects the electrical conductors against what?

Which branch circuit configuration is permitted to supply any volt-ampere or wattage rating of fixed electric space-heating equipment for which the branch circuit is rated?

For a stationary motor rated at 1/8(hp) or less that is normally left running and cannot be damaged by overload or failure to start, what device is permitted to serve as the motor controller?

Interrupter switches must be coordinated electrically with accompanying fuses or circuit breakers so that they will safely withstand the effects of closing, carrying, or interrupting all possible currents up to what maximum rating?

For replacement or retrofit switches installed prior to local adoption of 404.2(C)}, the connection requirement for a grounded conductor does not apply if it cannot be extended without performing which action?

A handhole is not required in a pole 8 ft. or less in height abovegrade if the supply wiring method continues without splice or pull point, and access to the interior is gained by removing what?

Freestanding-type office furnishings (not fixed) are permitted to be connected to the building electrical system by which method?

What is the required methodology for sizing Class 4 cables for conductors ranging from 24 AWG to 17 AWG?

Which of the following heating components is required to be listed and labeled?

What is the maximum permitted weight for cover plates intended to be removed for inspection of energized parts or wiring, unless they are hinged and bolted or locked?

Switch mechanisms mounted within enclosures with doors that expose uninsulated live parts must restrict access to the interior when the switch is in the closed position by requiring the use of what means?

Where must the mobile home service equipment be mounted relative to the mobile home?

Securing or supporting of LFNC is NOT required when installed in lengths not exceeding 1.8 m (6 ft) from a luminaire terminal connection for tap conductors permitted in which section?

Is liquidtight flexible metal conduit (LFMC) permitted to be reconditioned?

Which equipment is excluded from the short-circuit current rating requirement for MDCs connected to branch circuits and feeders?

When electrical installations are made in hollow spaces, vertical shafts, and ventilation or air-handling ducts, the installation must be made so that the possible spread of fire or products of combustion will not be what?

If a resistance-type boiler (ASME-rated) is rated more than 120(amperes), the heating elements must be subdivided into loads not exceeding what maximum current?

Ground-fault protection of equipment must be provided for electric heat tracing and heating panels, unless which condition is met in industrial establishments?

Each motor-winding connection for a part-winding start motor must have branch-circuit short-circuit and ground-fault protection rated at not more than what amount compared to the standard specified by 430.52?

Service-entrance cables must be supported at intervals not exceeding what maximum distance?

Not more than how many feeders shall be permitted where feeder conductors originate in the same distribution equipment and each feeder terminates in a single disconnecting means?

If a wind turbine tower is installed in close proximity to galvanized foundation or tower anchor components, what type of grounding electrodes shall be used?

What facility must be provided in an Emergency System to ensure proper function under maximum anticipated load conditions?

For spray application operations in temporary membrane enclosures, the area within the membrane enclosure shall be considered what classified area?

Interlock switches must be used on all hinged access doors, sliding panels, or other easy means of access to what component of the dielectric heating equipment?

Where shall LFMC NOT be used?

Alternating-current power distribution boxes used in production areas shall contain receptacles of what specific type?

Each duct heater must be provided with an approved, integral, automatic-reset temperature-limiting control or controllers to perform what action?

Where structural members do not readily permit fastening IMC within 900 mm (3 ft) of a termination point, fastening shall be permitted to be increased to what maximum distance?

If a boat slip provides two receptacles with different voltages, only the receptacle with the larger what shall be required to be calculated?

What is the maximum rating permitted for branch-circuit overcurrent devices protecting a single appliance rated 13.3 amperes or more that is supplied by an individual branch circuit in a mobile home?

Each electrode-type boiler designed so that there is a change in state of the heat transfer medium from liquid to vapor must be equipped with a pressure-sensitive limiting means that directly or indirectly interrupts what?

The equipment grounding conductor contained within the conduit or tubing of a manufactured wiring system must be equivalent in size to which conductor?

If the 20-ampere branch circuit required for a dwelling unit garage supplies a single vehicle bay, outlets for other equipment within the same garage shall be permitted to be supplied in accordance with 210.23(B)(1) and (B)(2). This circuit is also permitted to supply what other type of receptacle outlet?

What additional information must concealable nonmetallic extensions be clearly and durably marked with, besides the requirements of 310.8(A)?

What is required at all points where irrigation cable terminates?

What must be provided for each motor controller and shall disconnect the motor controller?

Conduit bodies supported by PVC conduit (per 352.10(I)) shall NOT support luminaires or other equipment and shall NOT contain devices other than splicing devices as permitted by which two sections?

For a permanently connected motor-operated appliance with a motor rated over 1/8(hp) , the disconnecting means must comply with 430.109 and 430.110 and must be located where?

What type of protection must a recessed remote ballast for a high-intensity discharge luminaire have?

What is the minimum wire-bending space and minimum gutter space required in switchboards, switchgear, and panelboards?

What must normally non-current-carrying conductive materials enclosing electrical conductors or equipment be connected to, according to 250.4(A)(2)?

The site-isolating device for agricultural buildings is not required to provide what form of protection?

If control conductors between the fire pump power transfer switch and the standby generator are routed through a building, they must be protected from fire for 2 hours using what minimum concrete encasement thickness?

What two appliances are explicitly excepted from the requirement of an electrical operational test in a mobile home to demonstrate they are in working order?

If a storage battery is used for control, signal power, or starting the prime mover of a Legally Required Standby System generator set, what must it be equipped with?

What is the minimum rating of the individual branch circuit permitted to supply a single receptacle for refrigeration equipment in the small appliance area of a mobile home?

What must be done to all cut ends of PVC conduit?

If a ceiling-suspended (paddle) fan weighs more than 16 kg (35 lb), what mandatory marking is required on the interior of the outlet box or outlet box system?

Which of the following pieces of input data is required to be provided on the nameplate of each heating equipment?

Nonmetallic conduit (PVC or RTRC) or a listed cable may be used underground if buried under not less than what minimum cover?

Bushings having holes 7 (mm)/ 9/32 (in) in diameter are permitted for use with what specific type of cord?

An equipotential plane shall be installed adjacent to outdoor service equipment or disconnecting means that control equipment in or on water if the system voltage exceeds what value to ground?

What must the single disconnecting means provided in a readily accessible location for each relocatable structure consist of?

Wires not smaller than 20 AWG are permitted for which specific type of circuit?

Auxiliary equipment for electric-discharge lamps must be enclosed in what type of cases?

Where GFCI protection is provided using GFCI receptacles and the branch circuits use flexible cord, the GFCI protection must be listed, labeled, and identified for what use?

For unbonded portable generators, when is GFCI protection not required for the 125 volt receptacle outlets?

For adjustable-speed drive systems that utilize a bypass device, motor overload protection must be provided where?

Portable and mobile types of X-ray equipment of any capacity shall be supplied through a suitable hard-service cable or what other component?

Which cable types, when installed in raceways, are permitted for optical fiber cables in Class II, Division 1 locations?

How shall the insulated grounded conductor of a feeder be identified?

A location adjacent to a Class I, Division 1 location may be classified as Class I, Division 2 if ignitible concentrations might occasionally be communicated, unless communication is prevented by what protective measure?

What is the minimum trade size RMC shall NOT be smaller than?

Outlet boxes or fittings used at luminaire or lampholder outlets on a vertical surface that are permitted to support a luminaire weighing more than 23 kg (50 lb) must be marked on the interior of the box to indicate what?

Where specific fixed loads are supplied and a circuit breaker or molded-case switch is used as the disconnecting means, what is the minimum required ampere rating?

For electrode boilers designed such that fault currents do not pass through the pressure vessel, all exposed non–current-carrying metal parts, including the pressure vessel, supply, and return connecting piping, must be connected to what component?

What is the minimum calculated load for show window lighting when calculated per linear 300 mm (1 ft) of show window?

In the dual system of units used in the Code, the inch-pound units shall appear in which format relative to the SI units?

For a 6 AWG negative polarity ungrounded conductor in a dc system operating over 60 volts, what is the maximum interval permitted for imprinting the minus signs (–) or the word NEGATIVE or NEG along the conductor length?

If the overcurrent device assembly protecting a feeder is listed for operation at 100 percent of its rating, what is the minimum required ampere rating of the overcurrent device?

For overcurrent protection of conductors in systems rated over 1000 volts, what is the maximum continuous ampere rating of a fuse allowed, relative to the conductor ampacity?

What exception is provided to the rule prohibiting open flames and spark-producing equipment in classified areas (Division 2, Zone 2, or Zone 22)?

In addition to the required overcurrent device, an automatic circuit breaker actuated by a reverse-current relay set to open the circuit at not more than the rated secondary current of the transformer shall be provided in the secondary connection of which transformers?

Which wiring method is not permitted for wiring running from the fire pump controller(s) to the pump motor?

Insulated or bare busbars used in switchboards and switchgear must be mounted in what manner?

Where shall the grounding electrode conductor connection be made in a grounded AC service?

Where must the insulated equipment grounding conductor for a branch circuit serving equipment on a floating pier terminate?

What is the minimum required width for the clear working space in front of the panelboard in a mobile home?

When is a listed primary protector required for a communications circuit running partly or entirely in aerial wire or aerial cable?

If the output cable to the primary pad is installed in conditions where drive-over could occur, what must be provided?

In an agricultural setting, a site-isolating device must be installed at the distribution point where two or more buildings or structures are supplied from where?

Thermostats that do not directly interrupt all ungrounded conductors or thermostats that operate remote-control circuits shall not be permitted to serve as what component?

Which component, when installed near a storm retention basin, must be connected to an equipment grounding conductor run with the circuit conductors in the same raceway, cable, or trench?

Where connections in Class 2 cable conductors are made in a wall, the connections shall be enclosed in which type of protective component?

For indoor electrical equipment, which enclosure type provides protection against falling dirt and incidental contact but does NOT provide protection against falling liquids?

Is a multioutlet assembly permitted where subject to severe physical damage?

What is the restriction on the usage of transfer equipment specifically designed for an Emergency System?

An incandescent lamp for general use on lighting branch circuits shall not be equipped with a medium base if rated over what wattage?

Which two markings are required on all nonlocking-type, 125 volt , 15text{-} and 20(ampere) receptacles controlled by an automatic control device?

A luminaire that weighs more than 3(kg) / 6(lb) or exceeds 16 in. in any dimension shall not be supported by which component?

How is the requirement for ground-fault protection of equipment determined for the overcurrent protection device of the Power Production Source service disconnecting means?

For Class III, Division 1 locations, Type PLTC-ER cable is permitted, provided it includes what specific conductor type in addition to a drain wire that might be present?

For multimotor equipment employing a shaded-pole or permanent split-capacitor-type fan or blower motor, what rating is used instead of the horsepower rating to determine conductor and equipment sizing?

For a continuous duty wound-rotor ac motor, what is the minimum ampacity percentage required for the conductors connecting the secondary to its controller?

What can cause some types of nonmetallic conduits to become brittle and therefore more susceptible to physical damage?

For an irrigation machine with inherent intermittent duty, how is the equivalent continuous-current rating determined for a motor that operates continuously at its maximum percent duty cycle?

When using instantaneous trip circuit breakers for motor short-circuit protection, what value must be assumed for the purpose of calculating the maximum rating of the protective device for the circuit supplying the machine?

What is the largest conductor size permitted for Type KFF-1 tape insulated fixture wire?

Which ampacity factors apply to conductors installed in cellular concrete floor raceways?

What two types of metal conduit must be used for underground wiring or cable enclosures in bulk storage plants?

General-use and motor-circuit switches, where mounted in an enclosure, must indicate their open (off) or closed (on) position in a location that is visible when performing which action?

For portable switchboards designed for 3-phase, 4-wire with ground supply, the current rating of the supply neutral terminal and its associated busbar/wiring shall have an ampacity equal to at least what ratio of the largest ungrounded supply terminal?

What is the minimum volume required for a standard 100 mm × 38 mm (4 × 1 1/2) square box?

Luminaires located more than what height above the floor, and switches located outside of the patient care vicinity, are excepted from the specific equipment grounding conductor requirements of 517.13(A) and (B)?

Separable locking-type connectors used for showcase coupling must be of a listed grounding type rated 15(amperes) or what other ampere rating?

Who is responsible for selecting and documenting the selective coordination for Emergency System overcurrent protective devices (OCPDs)?

A nonmotor-generator arc welder has a rated primary current of 80 amperes and a 40 percent duty cycle. If the mathrm{I}_{1eff} is not given, what is the minimum ampacity of the supply conductors?

For an aboveground tank with a fixed roof, what is the extent of the Division 1 / Zone 1 classified area around the open end of a vent?

Portable electric luminaires or other utilization equipment shall not be used in a spray area during spray operations, except where required for operations in spaces not readily illuminated by fixed lighting, in which case they must be identified for what location?

What is the maximum interval permitted for securely supporting busways, unless otherwise designed and marked?

For circuits rated over 1000 Volts, why must metallic enclosures of reactors and adjacent metal parts be installed correctly regarding induced circulating currents?

A thermostatically controlled switching device permitted to serve as both a controller and a disconnecting means must be designed so that the circuit cannot be energized automatically after the device has been manually placed in which position?

The calculated load of a feeder or service for electrified truck parking spaces shall be calculated on the basis of not less than how much kVA per parking space?

Workspace must be provided to facilitate routine servicing and maintenance, which involves tasks that can be accomplished by employees and where what is not required?

When must cable installations be inspected and approved before cables are covered or concealed?

All 125 volt , single-phase, 15text{-} and 20(ampere) floor receptacles installed in food courts and waiting spaces of passenger transportation facilities where food or drinks are allowed must have which protection?

If a disconnecting means is not provided for a stationary standby battery, where must a label with the required marking information be placed?

What is the exception to the requirement that stationary generators must be listed?

When an electric-discharge luminaire is permitted to be connected with a cord terminating in a grounding-type attachment plug or busway plug, if grounding is not required by 410.42, what type of plug is permitted?

What is the maximum interval permitted for securing ENT along a run?

Where portable electric drying apparatus is used in spray booths, electrical equipment within 18 in. of the floor must be identified for what classified location?

When equipment rated 800 amperes or more that contains overcurrent devices is installed, and a personnel door is located less than 7.6 m (25 ft) from the nearest edge of the working space, how must the door be equipped?

Which NEC section dictates how IBP systems shall be permitted for use as exposed runs?

For a thermostatically controlled switching device to serve as both a controller and a disconnecting means, it must meet five conditions, including having a marked “off” position and directly opening which conductors when manually placed in the “off” position?

Luminaires installed in indoor sports, mixed-use, or all-purpose facilities that use a mercury vapor or metal halide lamp and are subject to physical damage must protect the lamp with what component?

Single-conductor cable shall only be permitted in what minimum size?

What specific warning marking is required on all electrode-type boilers regarding servicing?

For simple apparatus components with a total surface area ge 20text{ mm}^{2} (excluding lead wires), what is the maximum power permitted for T4 classification, based on a 40 (C) ambient temperature?

Where flammable gases or vapors are released from cannabis oil equipment (other than booths), how far horizontally must the floor-level (up to 460 (mm)[18text{ in.}] high) classified area extend beyond the outer 2 ft. boundary?

Bends in FMC shall be made so that the internal diameter of the conduit is not effectively reduced, and the radius of the curve to the centerline of any bend shall not be less than shown in Table 2, Chapter 9, using which column?

The clothes closet storage space extends vertically to a height of 6 ft. or to what other height?

What is the maximum size (metric designator) permitted for FMT?

When separate devices are used to disconnect the motor/controller power supply and the motor control circuit power supply, where must they be located?

How many types of separable power supply cable assemblies are specified in 626.32(A) for TRU spaces?

A bushing or the equivalent must be provided where flexible cord enters the base or stem of a portable luminaire. When is the bushing not required to be of insulating material?

For open construction piers, wharfs, or docks, what is the extent of the Class I, Division 2 classified area?

An AC system of less than 50 volts must be grounded if supplied by transformers and the transformer supply system exceeds what voltage to ground?

A branch circuit shall not be derived from an autotransformer unless the supplied circuit has a grounded conductor that is electrically connected to a grounded conductor of the system supplying the autotransformer, UNLESS the transformation is from what nominal voltage combination?

When calculating the load for lighting circuits in a park trailer with more than five circuits, the calculation is based on what volt-ampere value per square meter?

Extensions must consist of a continuous unbroken length without splices or exposed conductors. When are taps permitted?

For single-conductor and multiconductor thermoset and thermoplastic-insulated wire and cable, the AWG size or circular mil area must be repeated at intervals not exceeding what maximum distance?

When IBP penetrates an exterior wall, what must the entire length that penetrates the wall be listed for?

In a Critical Operations Power Systems (COPS) generator set using internal combustion engines, what is prohibited regarding the reliance on external municipal supplies?

If multiple feeders supply an intermediate stage switchboard (patch panel), the neutral conductors in a given raceway need not be greater than the ampacity of the neutral conductor supplying what?

Where Wireless Power Transfer Equipment (WPTE) includes a control box, it must be suitable for the environment and mounted at a height not less than how far above grade level for outdoor locations?

A single building or structure shall generally be supplied by how many services?

Receptacles on circuits supplied by an isolating transformer with an ungrounded secondary must be distinctively marked and shall not be used where else?

In industrial establishments, an assured equipment grounding conductor program (AEGCP) is permitted instead of GFCI protection for receptacles supplying equipment that would create a greater hazard if power were interrupted, provided that only which personnel are involved?

Generally, each motor must be provided with what?

In Class I, Division 1 locations, what is the maximum permitted distance from the explosionproof enclosure at which a conduit seal must be installed, unless required otherwise by the enclosure marking?

Control equipment operating at 1000 Volts or less can be installed in compartments with high-voltage parts only if the access means is interlocked and what other condition applies to remaining energized high-voltage parts?

When nonmetallic boxes are used with metal raceways, what internal means must be provided to permit this use, according to Exception No. 1?

What is the maximum number of 12 AWG conductors permitted in a standard 100 mm × 54 mm (4 × 2 1/8) round/octagonal box?

What is the ampacity for 500 kcmil copper conductor, Type RHW-2, installed in a raceway or earth (direct buried) under standard conditions (30°C ambient, 3 CCC)?

How shall the supply terminals of fused interrupter switches be installed?

Where exposed to physical damage, which of the following must be protected?

If the service transformer is located outside the building, where must at least one additional grounding connection be made from the grounded service conductor?

For Class I, Division 1 locations, what type of cable, terminated with fittings listed for the location, is permitted, and must be installed and supported to avoid tensile stress at the termination fittings?

What is the maximum permissible total degrees of bends in a single LFNC run between pull points?

The requirement for Ground-Fault Protection for Personnel (590.6) applies to temporary wiring installations used to supply temporary power to equipment used by personnel during which activities?

Service-entrance cables must be supported within what maximum distance of every service head or connection to a raceway?

Overcurrent protection for conductors 14 AWG copper and larger in non-power-limited remote-control and signaling circuits shall be provided in accordance with the conductor ampacity, without applying which factors?

When enclosures for switches or overcurrent devices are used for feed-through conductors, splices, or taps, what is required for conductors 4 AWG and larger?

Where field-installed wiring passes through an opening in an enclosure, a conduit box, or a barrier, what must be used to protect the conductors from the edges of an opening having sharp edges?

For indoor electrical equipment, which enclosure type is suitable for protection against hosedown and splashing water, temporary submersion, and falling dirt, but NOT against corrosive agents?

Where must Type 2 SPDs be connected at a building or structure that is supplied by a feeder?

When the calculated load for a feeder is determined using Part III or IV of Article 220, what must the rating of the disconnecting means be not less than?

Where are barriers required to be placed to prevent inadvertent contact with energized, uninsulated, ungrounded busbar or terminals?

Where wet contact is likely to occur, ungrounded 2-wire DC control circuits are limited to 30 volts maximum for continuous DC, or what maximum peak voltage if the direct current is interrupted at a rate of 10 to 200 Hz?

What must the disconnecting means for utilization equipment, other than car lighting, ventilation, and heating/AC, be provided with?

What type of lampholders shall not be used for fixed incandescent lighting in aircraft hangars?

What two characteristics must the disconnecting means have, according to 426.50(A)}?

Flexible cords and cables entering enclosures containing devices requiring termination shall be secured to the box with which type of fitting?

If no overcurrent protective device is used in a Solar PV system circuit, what rating must be assumed when applying Table 250.122 for sizing the equipment grounding conductor?

Where the nominal voltage does not exceed 1000 Volts and the surrounding structure is classified as fire-resistant construction, a vault is not required if the total capacity in one location does not exceed what maximum kVA?

Service-entrance conductors entering or on the exterior of buildings or other structures shall be insulated, except that a grounded conductor made of aluminum or copper-clad aluminum for direct burial is permitted to be uninsulated where it is part of which assembly?

A power-operated service switch or circuit breaker used as the service disconnecting means must be capable of being opened by hand in the event of what?

When cutting through the cell wall for setting inserts, what precautions must be taken regarding tools?

Where contained within an auxiliary gutter or a wireway, the sum of the cross-sectional areas of all contained conductors shall not exceed what percentage of the interior cross-sectional area?

Class 2 cable exposed to sunlight shall be listed and marked with what marking?

For motors rated 1000 Volts or less, a single motor controller is permitted to serve a group of motors under three conditions. Which of the following is one of these permitted conditions?

Where cables or raceways are laid in notches in wood studs, the required steel plate protection must be installed at what time?

According to Table 645.10(B), which cable type under raised floors is covered by section 645.5(E)(1)?

Where flammable gases or vapors are released from cannabis oil equipment (other than booths), the space extending 2 ft. beyond the Class I, Division 1 or Zone 1 location shall be classified as what?

What must be done to all cut ends of ENT?

Non-utility-owned premises distribution transformers installed in the vicinity of an MDC must be of the dry type or what other type?

When the branch-circuit overcurrent protection is located on the load side of the disconnecting means, the specific bonding means for Class III locations is permitted to end at what nearest point?

Extra-hard usage portable power cable, when used as a feeder to a floating building, must be listed for which two conditions?

What marking is permitted on nonmetallic wireways that have limited smoke-producing characteristics?

Solar PV equipment floating on bodies of water must be identified as being suitable for the purpose and shall utilize wiring methods that allow for what factor?

How is the identification of conductors or cables used in the NUCC assembly provided?

If a large-scale PV electric supply station does not comply with the DC arc-fault protection requirements of 690.11, what must be included in the engineered design documentation?

The disconnecting means for ungrounded conductors in a fuel cell system must consist of what type of switch or circuit breaker?

If two single-phase dryers are supplied by a 3-phase, 4-wire feeder or service, the total load calculation must be based on how many times the maximum number connected between any two phases?

What is required for nonmetallic wireways and associated fittings?

Torque motors must be marked in accordance with 430.7(A), except that what rating shall replace horsepower?

If an energy management system (EMS) is used to limit the current to a feeder or service, the single value used in load calculations shall be equal to what setting of the EMS?

In addition to the manufacturer’s name, rating in volts, and frequency, what other rating must be marked on the nameplate of a crane, monorail, or hoist?

Where must tie circuits be provided with overcurrent protection?

What is the configuration rating for the attachment plug cap used for a park trailer wired with two to five 15- or 20-ampere branch circuits?

Devices that combine control signals with Class 2 emergency power on a single circuit in an Emergency System must be listed as what specific type of device?

Exposed runs of braid-covered insulated conductors must have a flame-retardant braid. If they lack this protection, what must be applied to the braid covering after installation?

The factory-installed attachment plug of cord-and-plug-connected equipment is permitted to be the disconnecting means if the equipment is rated 20(amperes) or less and what maximum voltage to ground?

According to Table 400.44(B)(1), what is the required equipment grounding conductor size (AWG) for a portable power feeder cable utilizing 3/0 AWG power conductors?

What is the minimum number of persons gathered for a building or portion of a building intended for assembly purposes?

Where one or more internal cable clamps are present in the box, the single volume allowance for clamp fill shall be made based on what characteristic?

A panelboard must be protected by an overcurrent protective device having a rating not greater than that of the panelboard, located within or at any point on which side of the panelboard?

Is NUCC permitted to be installed in cinder fill?

Which two general types of locations is RTRC permitted for use in, provided they are not prohibited by 355.12?

According to Table 355.30(B), what is the maximum spacing permitted between supports for RTRC trade size 1 1/4?

For an underground tank fill opening, what classification applies to any pit, box, or space below grade level if any part is within a Division 1 or 2, or Zone 1 or 2 classified location?

What provision must be made in each metal box for connection of an equipment grounding conductor?

When calculating the radius of the curve to the centerline of any bend in LFMC, which column in Table 2, Chapter 9, shall be used?

As an alternative to using a listed PVHCS, a Solar PV system must provide shock hazard control for firefighters by limiting the highest voltage inside the array boundary to not more than what maximum voltage within 30 seconds of rapid shutdown initiation?

What is the minimum required size for Antenna conductors for transmitting and receiving stations according to Table 810.52 (not provided here, but referenced)?

When calculating the minimum ampacity for multiple motors on a single crane, what percentage of the nameplate full-load ampere rating of the next largest motor or group of motors is added to the largest motor’s rating?

Where multiple Solar PV systems with rapid shutdown functions are installed on a single service, the initiation devices shall consist of not more than how many switches or sets of circuit breakers?

Which organization publishes the Recommended Practice for the Classification of Combustible Dusts and of Hazardous (Classified) Locations for Electrical Installations in Chemical Process Areas?

In wet locations within agricultural buildings, boxes, conduit bodies, and fittings shall be listed for what specific use?

Secondary circuits of low-voltage lighting systems are generally prohibited from being grounded, unless what exception applies?

What specific additional marking is permitted on surface nonmetallic raceways?

What is the maximum spacing permitted for fasteners (rivets, bolts, or screws) holding the assembly of a metal wireway together?

If a portable power feeder cable rated greater than 2000Volts is used and two layers of cable remain wound on the reel, what is the required ampacity correction factor?

The requirement to maintain 900 mm (3 ft) vertical clearance from the edge of the roof does NOT apply to the final conductor span under which condition?

According to Table 430.52(C)(1), what is the maximum percentage of full-load current permitted for a nontime-delay fuse protecting a polyphase squirrel cage motor (other than Design B energy-efficient)?

If 1-year maximum demand data is unavailable, the calculated load for determining existing capacity shall be based on a minimum of how many continuous days of recording using a recording ammeter?

RMC shall be permitted to serve as what type of conductor?

Personnel doors on transformer vaults must be capable of opening not less than 90 degrees in which direction?

Where passing through doorways or other pinch points, what must be provided to flexible cords and cables to avoid damage in temporary installations?

Following a failure of the normal supply, what is the maximum time permitted before an Emergency System must make emergency power and lighting available?

Where a busway is used as a feeder, devices for tapping off feeder or branch circuits shall contain what type of protection?

When using raceways to support an enclosure that does NOT contain a device(s), other than splicing devices, or support a luminaire(s) (Raceway-Supported Enclosure), what is the maximum size permitted for the enclosure?

Where installed on flexible pipelines, the heating elements and assemblies must have what specific capability?

Electric-discharge lighting systems with an open-circuit voltage exceeding 1000 Volts shall be listed and installed in conformance with what criteria?

Any pit or depression below the level of the hangar floor shall be classified as what type of location, extending up to the floor level?

If a WPTE primary pad is located in an area requiring snow removal, where shall it NOT be located?

Type S adapters shall be designed so that once inserted in a fuseholder, they cannot be what?

Permanently wired utilization equipment and receptacles must be grounded by an equipment grounding conductor run with the circuit conductors and connected to what in the branch-circuit panelboard?

Single conductors comprising an AC circuit connected in parallel must be installed in groups consisting of not more than one conductor per phase, neutral, or grounded conductor to prevent what?

What condition defines a Zone 21 location in relation to normal operation?

Where fixed heating equipment is supplied by more than one source, feeder, or branch circuit, the disconnecting means must be grouped and identified as having what characteristic?

If a secondary tie consists of multiple conductors per phase or neutral and the conductors are not interconnected (Not Interconnected), what must the combined capacity ampacity of the tie conductors be?

Which characteristic is required to be marked on a Surge-Protective Device (SPD)?

Equipment that is used in the final processing stages of the extracted plant oil (e.g., vacuum ovens, rotary evaporators) is classified as Cannabis Oil Post-Processing Equipment and must be what?

How is the maximum number of conductors or cables permitted in RTRC determined?

Which type of surge-protective device (SPD) is required for dwelling units and similar occupancies supplied by a feeder?

Is a multioutlet assembly permitted if cord and plug connected?

The Type of Protection “n” technique (Type nA, nC, and nR) is permitted for equipment only in which zone?

What is a permitted use for PVC conduit regarding concrete?

In other than dwelling units, what is the maximum ampere rating for a three-phase branch circuit rated 150 volts or less to ground that requires GFCI protection?

Other nonshielded cables (not covered in 305.15(A)(1) or (A)(2)) must be installed in RMC, IMC, or rigid nonmetallic conduit encased in not less than what minimum thickness of concrete?

What is the maximum length of unsupported and unsecured Type AC cable permitted at terminals where flexibility is necessary?

Strut-type channel raceways are permitted where exposed and in what type of location?

In an outdoor electrical installation operating at 100 kV, what is the minimum required elevation of unguarded live parts above the working space?

If a grounding electrode conductor is connected only to rod, pipe, or plate electrodes, what is the maximum size required for a copper conductor?

What type of protection must the branch-circuit distribution equipment installed in each relocatable structure include?

Listed conduit bodies having a radius of the curve to the centerline not less than that indicated in Table 2 of Chapter 9 for one-shot and full-shoe benders are permitted for combinations of conductors allowed by Table 1 of Chapter 9, provided they are marked to show what?

Using crystalline silicon PV modules, what correction factor is applied to the rated open-circuit voltage when the lowest expected ambient temperature is between 14(C) and 10(C)?

In industrial installations, when is the X-ray equipment disconnecting means not required (if the controller disconnecting means is lockable open per 110.25)?

What means must be provided to simultaneously disconnect all fixed electric pipeline or vessel heating equipment from all ungrounded conductors?

For an outdoor dispensing device (except overhead type), what is the extent of the Division 2 / Zone 2 classified location above grade level?

The exception allowing 30-day monitoring for determining existing loads is NOT permitted if the feeder or service employs what method?

Which insulated conductor type is explicitly exempted from the rooftop ampacity adjustment (temperature adder)?

For fixed multioutlet assemblies where appliances are likely to be used simultaneously, each 300 mm (1 ft) or fraction thereof shall be considered as an outlet of not less than how many volt-amperes?

The demand factors listed in Table 626.11(B) correlate with those found on what map?

What is the maximum overcurrent protection permitted for a 16 AWG conductor used in a Class 1 Circuit?

How must all interlock switches be connected on access doors or panels to the dielectric heating applicator?

In Article 506 locations, which two types of contacts shall not be depended on for bonding purposes for metal raceways and enclosures?

Operating handles requiring more than 23(kg) / 50(lb) of force must be located no higher than what elevation?

What is the minimum fire rating required for the walls and roof of an electrical vault?

When a pole or tower supporting a wind turbine is used as a raceway, it must be approved in accordance with listing, field label application, or what other method?

Under what condition is LFMC permitted to be used as an equipment grounding conductor in fixed installations?

For dc motors operating from a rectified single-phase, half-wave power supply, what is the minimum required ampacity percentage for conductors between the rectifier output terminals and the motor?

When are concealable nonmetallic extensions permitted more than three floors above grade?

Reconditioned motors are permitted if the reconditioning has been conducted in accordance with the manufacturer’s instructions or, if no instructions are provided, with what?

When adding heating or cooling to an existing dwelling using the optional method, what percentage of the load applies to the remainder of all other loads (over 8 kVA)?

What is the minimum required size for open individual aluminum overhead conductors used for outside branch circuits and feeders over 1000 volts?

What type of cable is permitted for fixed wiring installed at an elevation above hazardous (classified) locations (other than above cannabis oil booths)?

When the number of current-carrying conductors in a raceway or cable exceeds three, what is the adjustment factor applied to the ampacity of each conductor if the number of conductors is 21 to 30?

What must a fault-sensing system guard against in a 3-phase, 4-wire grounding autotransformer system?

For an underground tank vent, what is the extent of the Division 2 / Zone 2 classified location extending in all directions?

A feeder supplying a specific fixed motor load(s) must be provided with a protective device having a rating or setting not greater than the largest rating or setting of the branch-circuit short-circuit and ground-fault protective device for any motor supplied by the feeder, plus what other motor load component?

Energized bare parts mounted on doors operating at 1000 Volts, nominal, or less must be guarded where the door must be opened for what purpose?

In which application is Type AC cable permitted to be unsupported and unsecured?

The continuous current rating of a circuit breaker shall not be less than what value?

Current limiting service overcurrent protective devices are required for solidly grounded wye services where the voltage to ground is more than 150 volts but not exceeding what maximum phase-to-phase voltage?

If a snap-fit metal cover for strut-type channel raceways is used to achieve electrical continuity, is this cover permitted as the means for providing electrical continuity for a receptacle mounted in the cover?

What is the restriction on using Reconditioned Transfer Switches within an Emergency System installation?

When the number of current-carrying conductors in a raceway or cable exceeds three, what is the adjustment factor applied to the ampacity of each conductor if the number of conductors is 7 to 9?

Where is PVC conduit permitted to be installed concerning walls, floors, and ceilings?

In dry board applications, heating cable must be installed parallel to the joist, leaving a clear space centered under the joist of what minimum width between centers of adjacent cable runs?

For fixed electrostatic equipment, transformers, high-voltage supplies, control apparatus, and all other electrical portions of the equipment must be installed outside the Class I location or be of a type identified for the location, except for what parts?

How must surface nonmetallic raceways and associated fittings be supported?

In a recreational vehicle, a receptacle shall not be installed in what specific position in any countertop or similar horizontal surface?

If a park trailer panelboard cover is exposed to the inside aisle space, one of the working clearance dimensions is permitted to be reduced to what minimum width?

What type of conductor material shall be used to carry current unless otherwise provided in this Code?

Where must the nameplate of fixed electric space-heating equipment be located?

The supply circuit to the mechanical ventilation equipment shall be electrically interlocked with the EVSE equipment and shall remain energized during which period?

What is the maximum permitted combined voltage drop of feeder and branch-circuit conductors supplying fixed equipment in a 60/120-volt system?

For exposed deicing and snow-melting equipment, if the heating element is not in direct contact with the surface being heated, what must the design ensure regarding its temperature?

Solidly grounded Solar PV source circuits with not more than how many modules in parallel, and not located on or in buildings, are permitted without GFDI protection?

Where is the panelboard explicitly not permitted to be located in a mobile home?

Where must feeder and branch-circuit conductors have overcurrent protection located?

Fixture wires are permitted for installation in luminaires provided they are enclosed or protected and not subject to which physical stresses in use?

Where structural members do not readily permit fastening RMC within 900 mm (3 ft) of a termination point, the fastening distance shall be permitted to be increased to what maximum distance?

For temporary wiring over 600 volts, nominal, suitable fencing, barriers, or other effective means shall be provided to limit access only to which personnel?

What is the single-phase, nominal voltage rating required for the mobile home park secondary electrical distribution system to mobile home lots?

Electrode enclosures installed in damp and wet locations shall be specifically listed, labeled, and identified for use in such locations, or what alternative?

Switches, circuit breakers, motor controllers, and fuses, including pushbuttons, relays, and similar devices, used in Class III, Divisions 1 and 2 locations, must be provided with what type of enclosure?

EMT shall not be used for the support of luminaires or other equipment, except for what?

For equipment operating at 1001 V to 2500 V to ground, what is the minimum clear distance required in the working space where there are exposed live parts on one side and grounded parts on the other (Condition 2)?

What is the abbreviation permitted for an impedance-protected motor rated 100(watts) or less and complying with 430.32(text{B})(4)?

For an electrical system to be classified as an Integrated Electrical System, what specific requirement is necessary regarding maintenance and supervision?

What type of conductor is permitted to be omitted from conductor fill calculations where it enters a box from a domed luminaire or similar canopy and terminates within that box?

When outdoor lampholders are attached as pendants, how must the connections to the circuit wires be arranged?

Equipment enclosed in a manner that excludes dusts and does not permit arcs, sparks, or heat generated inside the enclosure to ignite exterior accumulations of a specified dust is defined as what?

The panels of switchboards and switchgear must be made of which two material characteristics?

The documentation certifying that the construction of a large-scale PV electric supply station conforms to the engineered design must be available prior to what stage of the station’s operation?

Unless otherwise specified, what is the assumed condition for motors when determining normal operating conditions?

For heating equipment with supplementary overcurrent protection and containing no motor rated over 1/8text{ horsepower}, when is the disconnecting means specified in 425.19 permitted to serve as the required disconnecting means for both the motor controller(s) and heater?

A system or circuit conductor that is intentionally grounded is defined as the:

Which of the following items are auxiliary gutters prohibited from enclosing?

The current flow from the output circuit to ground must be limited to a value that does not cause what voltage or more to ground to appear on any accessible part of the heating equipment and its load?

The requirement for grouping or identifying neutral conductors in an enclosure does not apply if the conductors meet which condition?

IBP systems shall be used within what limitation?

How is the maximum number of conductors or cables permitted in PVC conduit determined?

If the Energy Storage System (ESS) disconnecting means is located outside of sight and more than 3 m (10 ft) away from the ESS, what security requirement must it meet?

If Critical Operations Power Systems (COPS) feeders are installed below the level of the 100-year floodplain, what specific installation requirement must the insulated circuit conductors meet?

An equipotential plane installed adjacent to outdoor service equipment controlling equipment in a natural body of water must encompass the area around the equipment and extend out not less than what minimum distance in all directions from which a person would be able to stand and come in contact with the equipment?

What is the maximum permissible total degrees of bends in a single run of FMC between pull points?

What are the permitted flat copper conductor sizes (equivalent AWG) used in concealable nonmetallic extensions?

If fuses are of the type that can be operated as a disconnecting switch, a set of such fuses shall be permitted to be used as what specific component in the service installation?

For an outdoor remote pump installation, what Class I location applies to the entire space within any pit or box below grade level, any part of which is within 10 ft. horizontally from any edge of the pump?

Using Table 625.52(B)(1)(2), what is the minimum single-phase ac ventilation requirement in cfm for one EVSE charging at 120 V with a 30 A branch circuit rating?

If ground-fault protection of equipment (GFPE) is provided on a service or feeder in a health care facility containing Category 1 spaces, an additional step of GFPE shall be provided in all next level feeder disconnecting means downstream toward the load, but shall not be installed where?

Audio amplifier output circuits carrying audio program signals shall be permitted to employ Class 1, Class 2, or Class 3 wiring provided the amplifier is what?

If a branch circuit supplies a continuous load, and the overcurrent device assembly is listed for operation at 100 percent of its rating, the rating of the overcurrent device shall be permitted to be not less than:

When a feeder supplies both a motor load and other load(s), the feeder protective device rating must not be less than the sum of the rating required for the other load(s) plus the rating permitted by 430.62 for which type of motor application?

Rigid polyvinyl chloride (PVC) conduit suitable for the location shall be used to protect wiring to a point at least how far above docks, decks of piers, and landing stages?

Communications, radio, and television coaxial cables must be installed at a height not less than what distance above the maximum water level of a swimming pool?

For tunnels over 1000 volts, what type of enclosure is required for switches or contactors?

Where the primary rated current of a control circuit transformer is less than 2(amperes), what is the maximum rating or setting permitted for the overcurrent device in the primary circuit?

Resistance-type boilers employing immersion heating elements contained in an ASME-rated and stamped vessel shall have the heating elements protected at not more than what maximum ampere rating?

What specific warning wording must be applied adjacent to the back-fed circuit breaker from a Power Source when the 120% busbar rule (705.12(B)(2)) is used?

On a 4-wire, delta-connected service where the midpoint of one phase winding is grounded, what color finish must the service conductor having the higher phase voltage to ground be durably and permanently marked with?

Circuit breakers and switches containing fuses shall be readily accessible and installed so that the center of the grip of the operating handle, when in its highest position, is not more than what maximum height above the floor?

What type of switch or circuit breaker is required for the main power supply disconnecting means?

For a grounding autotransformer used as a ground reference for fault protection devices, the overcurrent protection shall be rated or set at a current not exceeding 125 percent of the autotransformer continuous per-phase current rating or what percentage of the continuous-current rating of any series-connected devices in the autotransformer neutral connection?

If a meter disconnect is used as the emergency disconnect, it must be integral to the meter mounting equipment and not marked as suitable only for use as what?

What protection technique is permitted for current-interrupting contacts in Class I, Division 2 locations?

If a separate equipment grounding conductor (EGC) is used for extensions from a metal wireway, which two NEC sections must govern the connection of the EGC to the wireway?

For surface marking, information other than the AWG size or circular mil area shall be repeated at intervals not exceeding what maximum distance?

What is the minimum trade size permitted for Intermediate Metal Conduit (IMC)?

In Class III locations, what type of joint is permitted for metal ventilating pipes where some flexibility is necessary, such as at connections to motors?

If Critical Operations Power Systems (COPS) loads are supplied by a single feeder, what measure must be included to facilitate maintenance without jeopardizing continuity of power?

For a service rated 200 amperes supplying the entire load associated with a one-family dwelling, what is the minimum required size for copper service conductors, if no adjustment or correction factors are required?

What must a hermetic refrigerant motor-compressor nameplate indicate in addition to the manufacturer’s identification, designation, voltage, and frequency?

When using a listed electrical circuit protective system, a junction box must be installed ahead of the fire pump controller a minimum of 300 mm (12 in.) beyond what specific structural boundary?

Ungrounded conductors tapped from a grounded system must be controlled by switching devices that manually switch all poles together if the device serves as a disconnecting means for which appliance?

If switching devices in busways over 1000 volts are not load-break, what must be installed?

What must nonmetallic auxiliary gutters installed indoors be listed for?

Except for protection of transformer primaries provided in 695.5(C)(2), branch-circuit and feeder conductors supplying a fire pump motor must be protected only against what type of electrical fault?

During factory testing of a park trailer’s electrical system, what is the required duration and voltage for the AC dielectric strength test (with all switches closed) between ungrounded and grounded conductors and the park trailer ground?

Unused current transformers associated with potentially energized circuits shall be:

Each factory-assembled heating unit must be legibly marked with identification symbols, catalog numbers, and ratings within what maximum distance of each end of the nonheating leads?

In a Type 1 essential electrical system, conductors of the life safety branch or critical branch shall not enter the same raceways, boxes, or cabinets with each other or any other wiring system, except in which specific locations?

Where couplings and connectors used with EMT are buried in masonry or concrete, what type must they be?

What is the minimum spacing required between live parts and ground for a nominal voltage not over 600 Volts in a motor control center, according to Table 430.97(text{D})?

Overcurrent protection provided by an assembly listed for fire pump service shall not open with a re-start transient of what magnitude relative to the full-load current of the fire pump motor(s)?

When installing the header, how must the end joints be closed and sealed?

In a major repair garage (Class I liquids/gaseous fuels), the area up to 18 in. above floor level is unclassified if the room is provided with ventilation of at least 0.3text{ m}^{3}/text{min}/text{m}^{2} / 1text{ ft}^{3}/text{min}/text{ft}^{2}) with suction taken from what location?

Flexible cords and flexible cables must be connected to devices and fittings so that tension is not transmitted to joints or terminals, unless what condition applies?

What must be installed with high-voltage circuit conductors in tunnels?

When extending transversely through dry walls, dry partitions, or dry floors, what condition is required regarding the length of surface nonmetallic raceway passing through?

A fire pump shall be permitted to be supplied by a separate service or from a connection located ahead of and not within the same cabinet, enclosure, or section as what other component?

Under what condition is LFMC permitted to be unsecured and unsupported?

In walls of concrete, tile, or other noncombustible material, what is the maximum distance the front edge of a cabinet can be set back from the finished surface?

Each resistance-type boiler designed so that in normal operation there is a change in state of the heat transfer medium from liquid to vapor must be equipped with what specific device to limit maximum pressure?

Battery compartments in a PV powered sign must include which security feature?

Is equipment housed in a turbine nacelle required to have a disconnecting means?

Areas designated as hazardous (classified) locations or determined to be unclassified must be documented on an area classification drawing and other associated documentation, and must be made available to whom?

What type of limitation must be provided for separately excited DC motors and series motors?

Lamps (bare bulbs) installed in backstage and ancillary areas that might contact scenery must provide an air space of not less than what minimum distance between the lamp and any combustible material?

Under what condition is EMT not permitted to be used?

A copper conductor grid used for bonding a conductive swimming pool shell must be secured within or under the pool no more than what maximum distance from the outer contour of the pool shell?

Totally enclosed motors supplied with positive-pressure ventilation or inert gas in Class I, Division 1 locations shall have no external surface with an operating temperature in degrees Celsius in excess of what percentage of the autoignition temperature of the gas or vapor involved?

When installing audio transformers and autotransformers, what is the limitation on their use?

Where exhaust air is permitted to be recirculated in an enclosed spray booth, the interior of any recirculation path from the secondary particulate filters up to and including the air supply plenum shall be classified as what?

The 20 ft. separation distance between gaseous fuel storage tanks and dispensing equipment does not apply if both the gaseous fuel storage and dispensing equipment are at least what minimum distance from any other aboveground motor fuel storage or dispensing equipment?

Fixed and stationary X-ray equipment shall be connected to the power supply by means of a wiring method meeting the general requirements of this Code, except when the branch circuit rating is not over what amperage?

Which Class II, Division 1 listed equipment is permitted to be used in Zone 20 locations for Group IIIA materials?

Which transformer secondary conductors are NOT considered protected by the primary overcurrent protective device?

The laundry branch circuit required in a dwelling unit must be rated at least 20 amperes and shall supply which outlets?

Outdoor service equipment or disconnecting means that control equipment in or on water and are likely to become energized must be bonded to what component?

Each electrode boiler designed so that in normal operation there is no change in state of the heat transfer medium must be equipped with a temperature-sensitive limiting means that directly or indirectly interrupts what?

Fittings and connectors intended to be concealed for Solar PV module interconnection must be equal to the wiring method employed in insulation, temperature rise, short-circuit current rating, and what other characteristic?

When PVC or RTRC conduit is used underground in Zone 1 locations, it must be encased in a minimum of what thickness of concrete?

The number of conductors or cables installed in surface nonmetallic raceway shall not be greater than what maximum number?

If a device or utilization equipment is wider than a single 50 mm (2 in.) device box, how many double volume allowances must be provided for each gang required for mounting?

Which wiring method is permitted in buildings or portions of buildings that are not required to be of fire-rated construction?

What is a functional requirement for Power Production Sources operating in parallel with a primary source or other power production sources?

If a location is adjacent to a Zone 0 location, it may be classified as Zone 1 unless communication is prevented by adequate positive-pressure ventilation using what type of air source?

If an equipment disconnecting means is not within sight or not within 3 m (10 ft) of the Solar PV equipment, what additional requirement must the disconnecting means or its remote operating device meet?

The field marking of the available short-circuit current must include the date the calculation was performed and what other property?

When is the equipment grounding conductor permitted to be run separately from the ENT raceway when grounding dc circuits?

Using Table 625.52(B)(1)(1), what is the minimum dc ventilation requirement (DC ge 50V) in m^3/min for one EVSE charging with a 100 A branch circuit rating?

The disconnecting means for each portable structure shall be located within sight of and within what maximum distance of the operator’s station?

For explosionproof equipment provided with threaded entries for NPT-threaded conduit or fittings, listed conduit, listed conduit fittings, or listed cable fittings shall be used, and the NPT-threaded entries must be made up with at least how many threads fully engaged?

Service raceways exposed to the weather must be arranged to drain and must be listed or approved for use in which type of location?

Where must Type 2 SPDs be connected in a service-supplied building or structure?

Part V of Article 425 applies to any heater mounted in the airstream of a forced-air system where which component is not provided as an integral part of the equipment?

For a Legally Required Standby System connected ahead of the service disconnecting means, how must the standby service be installed relative to the normal main service disconnecting means?

Flexible cords and cables used to connect moving parts of Power Production Equipment must be listed and identified as DG cable or what other specific requirement?

All receptacle outlets in a mobile home bathroom must be supplied by at least one 20-ampere branch circuit. What outlets, other than the receptacles themselves, are permitted on this circuit?

When the interrupting device of the personnel protection system is located at the attachment plug or within the first 300 mm (12 in.) of the power-supply cord, what is the maximum overall cord length permitted?

For indoor use, which enclosure type provides protection against oil and coolant seepage, circulating dust, and falling liquids, but does NOT protect against hosedown?

For Class I, Division 1 and Division 2 locations, the cross-sectional area of the conductors or optical fiber tubes permitted in a seal shall not exceed what maximum percentage of the cross-sectional area of a rigid metal conduit of the same trade size?

What type of communications wire, such as distributing frame wire or jumper wire, must be listed as being resistant to?

How must all joints between NUCC conduit, fittings, and boxes be made?

When is Cablebus permitted to be installed outdoors?

What is the minimum required height of the door sill or curb provided for a vault doorway?

For an existing panelboard used as service equipment for an individual residential occupancy, is individual protection required?

Screwless terminals of the conductor push-in type construction on snap switches shall be installed on not greater than 15(ampere) branch circuits and shall be connected with which specific conductor type?

Fixed industrial process heating equipment must be provided with a nameplate identifying the manufacturer and the rating in volts and watts or in what other rating unit?

For mogul-base or medium-base screw shell lampholders used in pendant conductors (not festoon wiring), what is the minimum permitted conductor size?

The common-return conductor is permitted to be installed as a separate conductor, provided it is permitted to be in contact with what other component?

What is a generally permitted use for nonmetallic wireways?

Luminaires permitted in commercial cooking hoods must be constructed so that what materials are excluded from the lamp and wiring compartment?

What characteristic defines a Zone 22 location?

What type of battery must have insulating support if a voltage is present between the container and ground?

How is the maximum number of conductors permitted in HDPE conduit determined?

For conductors supplying multiple motor-compressors, with or without additional motor loads, the required ampacity is the sum of the rated-load or branch-circuit selection current of all motor-compressors, plus the sum of the full-load current rating of all other motors, plus what final component?

When more than one DC cell line process power supply serves the same cell line, where must a disconnecting means be provided for each power supply?

Compliance with the numbers shown in which system constitutes compliance with this Code?

What is the maximum distance EMT shall be securely fastened from each outlet box, junction box, cabinet, or other termination?

A detection system for flammable gases is permitted as a means of protection only in what specific type of establishment?

How must the manufactured phase conductors be identified in all accessible locations?

RTRC is prohibited where subject to ambient temperatures in excess of what value, unless listed otherwise?

Auxiliary equipment, such as reactors, capacitors, resistors, and similar equipment, not installed as part of a luminaire assembly, must be enclosed in what type of cabinet?

Listed tamper-resistant receptacles shall be provided where replacements are made at receptacle outlets required to be tamper-resistant, except when a nongrounding receptacle is replaced with what other type?

What is the maximum interval permitted for supporting flexible insulated bus conductors on identified mounting means for horizontal runs?

What is the only type of fitting permitted to be installed on lighting track?

What type of equipment must each dwelling unit be equipped with to use the optional calculation for multifamily dwellings (220.84)?

For resistance-type boiler heaters rated 50(kW) or more, the conductors supplying the supplementary overcurrent protective device are permitted to be sized at not less than 100 percent of the nameplate rating, provided a temperature- or pressure-actuated device controls which operation?

What must the interior surfaces of cellular metal floor raceways be free from?

The overall system governing the starting, stopping, direction of motion, acceleration, speed, and retardation of the moving member is defined as the:

What is the ampacity for 4/0 AWG aluminum conductor, Type XHHW-2, installed in a raceway or earth (direct buried) under standard conditions (30°C ambient, 3 CCC)?

The converting device of induction and dielectric heating equipment (excluding component interconnections) shall be completely contained within an enclosure(s) made of what type of material?

RTRC is prohibited from being used in any hazardous (classified) location, except as permitted by what?

For metal-enclosed busways over 1000 volts, what is the goal regarding temperature rise from induced circulating currents in adjacent ferrous metal parts?

What is the ampacity for 4 AWG copper single-insulated conductor supported on a messenger, Type THW, installed in a 40°C (104°F) ambient temperature?

Where bus enclosures terminate at machines cooled by flammable gas, what must be provided to prevent accumulation of flammable gas in the enclosures?

Power-limited control power sources, other than transformers, shall be protected by overcurrent devices rated at not more than what percentage of the volt-ampere rating of the source divided by the rated voltage?

If multiple disconnecting means are used and parts of the controllers remain energized from another source, what warning sign must be mounted on or next to the disconnecting means?

What is the minimum required ampacity for the service conductors connected to the Power Production Source service disconnecting means?

For resistance welders wired for a specific operation, which duty cycle requires a greater supply conductor ampacity multiplier: 40 percent or 50 percent?

If metal raceway or metal cable tray is used to connect auxiliary equipment mounted on an energized surface, what must be installed to prevent a potentially hazardous electrical condition?

The branch-circuit requirements for cord-and-plug-connected equipment rated not greater than 250 Volts, single-phase (like household refrigerators), are determined by what?

In locations where only moderate accumulations of ignitible fibers/flyings are likely, and the machine is readily accessible for routine cleaning and maintenance, which type of motor is permitted as an exception?

For buildings or structures supplied by additional feeders permitted under Common Supply Equipment (225.30(B)), how must all feeder disconnects supplying the building or structure be located?

Conductors supplying several motors must have an ampacity not less than the sum of 125 percent of the full-load current rating of the highest rated motor plus what other motor load component?

Type SO flexible cords must be durably marked on the surface at intervals not exceeding what distance?

When setting inserts or providing access openings between header and cells, what action must be taken regarding chips and dirt?

The point of entrance of a power-supply assembly on a recreational vehicle must be located within 15 ft. of the rear, on the left (road) side or at the rear, left of the longitudinal center of the vehicle, within what maximum distance of the outside wall?

If primary-only protection is used for a transformer rated 1000 Volts or less with rated primary current less than 2(amperes), what is the maximum percentage rating permitted?

Under which condition regarding conductor ampacity is overcurrent protection not required for Solar PV system DC circuits?

Where must the separately derived 60/120-volt system be clearly marked on a panelboard?

The means required to reduce the strain on the plug and receptacle caused by the weight and catenary angle of the shore power cord is called:

Wiring methods permitted in marinas shall be identified for use in wet locations and must contain what type of conductor?

A power transformer connected toward the interactive inverter output in a Solar PV system is permitted without overcurrent protection from the inverter if its current rating on the side connected toward the inverter output is not less than what value?

What is the maximum permitted interval for securing nonmetallic surface extensions?

If conductors operate at 25 kV to ground, by what minimum distance must the clearances specified in Table 235.360(A) be increased?

Fixed lighting branch circuits supplied by a normal grounded service in anesthetizing locations must have the luminaires located at least what minimum height above the floor?

What is required concerning grounding for metal-enclosed busway over 1000 volts?

Panelboards must be dead-front and mounted in cabinets, cutout boxes, or identified enclosures, except where accessible only to whom?

When connecting an expandable unit to the main body of a park trailer using a cord-and-plug connection, what specific type of parallel cord is permitted if the connection is located within the park trailer’s interior?

For 10 AWG stranded copper PV wire connected to moving parts of tracking PV arrays, what is the minimum required number of strands?

How are receptacles supplied from an Emergency System required to be identified?

If the required distance from the edge of a wood member cannot be maintained when boring a hole, what is the minimum required thickness for the steel plate or bushing used for protection?

What must happen to openings around penetrations of cables and communications raceways through fire-resistant–rated walls to prevent the spread of fire or products of combustion?

Any areas of ITE that require servicing of parts that are greater than 42 volts peak shall comply with which workspace requirements?

Which cable type is permitted as a substitute for CL2X cable?

Where portable power cables are used between floating pier sections, which alternative is permitted in lieu of a corrosion-resistant junction box with permanently installed terminal blocks?

The Code does not cover installations under the exclusive control of an electric utility where they consist of service drops or service laterals, and what associated equipment?

For connections within an accessible ceiling to luminaire(s) or other equipment, what is the maximum length of unsecured ENT permitted from the last point where the raceway is securely fastened?

The size of branch-circuit conductors and overcurrent protective devices for electrode-type boilers shall be calculated on the basis of what percentage of the total load (motors not included)?

In skin-effect heating systems, when is the ampacity of the electrically insulated conductor inside the ferromagnetic envelope permitted to exceed the values given in Table 310.16?

Where the disconnecting means for a fluorescent or LED luminaire is external, what is the maximum number of devices permitted, and where must it be located?

The ampacities under subheading D of Table 400.5(A)(2) permit single-conductor flexible cables to pass through the wall of an enclosure without being adjusted, provided the length passing through does not exceed:

For a dc branch circuit operating at 120 volts, what is the required identification for the positive ungrounded conductor of 6 AWG or smaller, if it uses imprinted marking on insulation other than green, white, gray, or black?

For a separately derived system, where must the SPD be connected?

What is the minimum conductor size permitted for festoon lighting if the conductors are NOT supported by messenger wires?

For Type ACT cable, where is a moisture-resistant fibrous covering required?

For battery chemistries with corrosive electrolyte, what substance alone shall not be considered as an insulating material for metallic support structures?

When connecting aluminum conductors, the terminals shall be identified for which specific condition?

Which requirement must be met by all conductors and equipment used on circuits over 1000 volts, nominal?

For overcurrent devices rated 800 amperes or less, the next higher standard rating above the conductor ampacity shall be permitted, provided the conductors being protected are NOT part of a branch circuit supplying what?

In an existing premises where a new, different voltage system is added, identification is required only for the new system. What wording must be included on the new system label(s)?

For pull and junction boxes used on systems over 1000 volts, which section covering conductor fill is specifically required to be complied with?

Where are Solar PV system DC circuits with a maximum voltage greater than 1000 volts explicitly not permitted?

For flexible connections in Class II, Division 1 locations, which wiring method is explicitly permitted using listed fittings and bonded in accordance with 502.30(B)?

If a Zone 1 location is classified as such solely due to inadequate ventilation and is provided with a detection system, what level of installation suitability is permitted for the electrical equipment?

If dimmers are installed in ungrounded conductors, each dimmer shall have overcurrent protection not greater than what percentage of the dimmer rating?

When a branch-circuit overcurrent plug-in device directly supplies a readily accessible disconnect, what is NOT required?

The conductors supplying the supplementary overcurrent protective devices shall be considered what type of conductors?

Which types of conductors are NOT considered current-carrying when determining ampacity adjustment factors in sheet metal auxiliary gutters?

Listed cord sets or devices incorporating listed GFCI protection are permitted for use with 15-kW or less portable generators manufactured or remanufactured prior to which date?

According to Table 344.30(B), what is the maximum distance between supports for straight runs of trade size 3 RMC?

Equipment having an open circuit voltage exceeding 1000 volts shall not be installed in or on which type of occupancy?

For an individual branch circuit supplying an appliance, the ampacities of the conductors shall not be less than which rating?

Which of the following is NOT permitted as a means of identifying a grounded conductor 6 AWG or smaller?

If a permanent marking means, such as sleeving, is used to identify a 6 AWG or smaller negative polarity dc ungrounded feeder conductor, what insulation colors are NOT permitted for the permanent marking means itself?

What size information is required to be marked on all IBP?

Which type of conduit or tubing is NOT listed as a permitted component for a manufactured wiring system assembly?

What type of flexible cords or cables, as defined by Article 400, must be used for the supply to a portable equipment rack?

Which of the following is not required to be secured in place when installed under raised floors?

Splices and taps are permitted in surface nonmetallic raceways having a cover capable of being opened in place, provided they do not fill the raceway more than what percentage of its area?

Projectors and enclosures for arc, xenon, and incandescent lamps and rectifiers, transformers, rheostats, and similar equipment must all meet what mandatory requirement before installation?

Adjustable luminaires that are cord-connected without an attachment plug must use an exposed cord suitable for hard-usage or extra-hard-usage and must not be subject to what two hazards?

Cords on the load side of a listed Class 2 power source for lighting accessories are not required to contain which conductor?

When RMC or IMC conduit is used for the last portion of an underground run to emergence in a Class I, Division 1 location, what is the minimum required length of the run for the RMC or IMC?

For a system rated not over 1000 Volts, nominal, what is the minimum spacing required between uninsulated metal parts of opposite polarity when held free in air?

If a fused panelboard is used as the disconnecting means in a mobile home, what is the minimum required height for the lettering that plainly marks the maximum fuse size for the mains?

Are guy wires used to support turbine towers required to be connected to an equipment grounding conductor?

Single-conductor PV wire or cable permitted in cable trays in outdoor locations must be supported at intervals not to exceed what distance?

Parts of the same polarity at switches or enclosed fuses can be placed as close together as convenience in handling will allow, provided what condition is met?

For series capacitors over 1000 Volts, switching procedure must be ensured by use of one of three methods, including mechanically sequenced isolating and bypass switches, interlocks, or what other method?

Where secondary ties are used, an overcurrent device rated or set at not more than what maximum percentage of the rated secondary current of the transformers must be provided in the secondary connections of each transformer?

For floating structures installed on a storm retention basin designed to permit rise and fall response to water level, what is the minimum height required for the electrical datum plane above the level of the deck?

For systems requiring orderly shutdown, what grounding status is permitted for two-wire dc circuits in an Integrated Electrical System?

How is the maximum number of conductors or cables permitted in NUCC determined?

Where is positive-pressure ventilation permitted in vehicle charging applications that require ventilation?

Short sections of raceways used to provide support or protection of cable assemblies from physical damage are NOT required to be what?

In a 3-wire circuit consisting of two phase conductors and the neutral conductor of a 4-wire, 3-phase, wye-connected system, how shall the neutral conductor be counted?

According to Table 430.7(B), what is the range of kilovolt-amperes per horsepower with locked rotor corresponding to Code Letter J?

If flexibility is necessary in Class I, Division 1 locations, what condition must Type TC-ER-HL cable meet to be permitted as a flexible connection in restricted industrial establishments?

If conductors of higher ampacity are used for a branch circuit rated 30 amperes, what determines the circuit rating?

What is the minimum required size for hard-drawn copper overhead service conductors supplying only limited loads of a single branch circuit?

The rating of the service disconnect for GFPE consideration is considered to be the rating of the largest fuse that can be installed or what setting for a circuit breaker?

In Zone locations, uninsulated exposed electrical parts shall not operate at more than what maximum voltage (or maximum voltage in wet locations)?

For flexible connections in Class I, Division 2 locations, what is the maximum permitted length for liquidtight flexible metal conduit that is listed for grounding and does not require an equipment bonding jumper, provided overcurrent protection is limited to 10(amperes) or less and the load is a meter, instrument, or relay circuit?

Attachment plugs and receptacles installed in Class I locations in aircraft hangars must be identified for the location or be designed to prevent what?

In a minor repair garage (no transfer/dispensing), the area up to 18 in. above floor level extending 3 ft. horizontally in all directions from the opening to any unventilated pit, belowgrade work area, or subfloor work area is classified as what?

Where circuit breaker handles are operated vertically, which position of the handle shall be the “on” position?

Supply conductors on the load side of the final disconnecting means and overcurrent device(s) permitted by 695.4(B) for a fire pump system must comply with which routing requirement?

For motor circuits rated over 1000 Volts, nominal, what is the maximum length permitted for flexible metal conduit or liquidtight flexible metal conduit used for raceway connection to a motor terminal enclosure?

For prewiring an air-conditioning unit in a park trailer, the maximum ampere rating marked on the safety label shall not exceed what percentage of the circuit rating?

If the span of bridge wire contact conductors exceeds 25 m (80 ft), insulating saddles shall be placed at intervals not exceeding what maximum distance?

Which Group classification corresponds to atmospheres containing combustible metal dust, including combustible metal fibers/flyings?

In dormitory units, 120-volt, single-phase, 15-ampere branch circuits supplying outlets or devices installed in which location shall be protected by AFCI?

What type of equipment is permitted to be used for atmospheres containing butadiene if all conduit runs into explosionproof equipment are provided with explosionproof seals installed within 18 in. of the enclosure?

Which type of X-ray equipment is not required to comply with the grounding requirements of this Code?

Where multiple switch locations control the same lighting load, the grounded conductor is only required at one location, provided which condition is met?

All unused openings in equipment provided with threaded entries shall be closed with blanking elements or close-up plugs that are listed for what?

Alternating-Current General-Use Snap Switches rated for 347 Volts ac shall not be rated less than what ampere value?

Inverters, PV modules, and dc-ac converters intended for use in PV powered sign systems shall be listed for which specific application?

For an installation operating at 1001 V to 2500 V to ground, what is the minimum clear distance required in the working space where exposed live parts on one side are effectively guarded by insulating materials (Condition 1)?

Cable tray systems shall not be used in which two locations/conditions?

According to Table 400.44(B)(3), what is the required size (AWG) for the equipment grounding conductor in a 6 AWG power feeder cable rated 2000 to 5000Volts?

Receptacles for portable lighting equipment, supplied by single-phase branch circuits rated 150 volts or less to ground, installed in welder work areas, shall have ground-fault circuit-interrupter protection for personnel if rated 125 volts and what amperage?

What is the maximum length LFNC is generally permitted to be installed in, unless secured in accordance with 356.30 or a longer length is approved for required flexibility?

Adjustment factors shall not apply to conductors installed in raceways having a length not exceeding what maximum distance?

How is the maximum current for a wind turbine output circuit calculated for circuit sizing purposes?

Boilers operating over 1000 Volts must be supplied only from what type of electrical supply system?

If portable hard usage (junior hard service) cord/cable is used in a protected application, what is the maximum length permitted for the cord or cable?

If fused cutouts are not suitable to interrupt the circuit manually while carrying full load, what must be installed?

For a power inlet used with a portable generator, which specific warning must be displayed if the system is intended for connection of a bonded neutral system?

Where are power distribution blocks permitted for connections of conductors in pull and junction boxes?

Where single conductor cables of an AC circuit are connected in parallel, how must the conductors be installed in metal wireways?

Electrical equipment installed in agricultural buildings must function at full rating without developing surface temperatures exceeding what?

The rating or setting of the overcurrent protective device for the circuit supplying the machine shall not be greater than the sum of 125 percent of the full-load current rating of all resistance heating loads plus what largest rating/setting?

Which of the following is required to be included on the permanent nameplate of industrial machinery related to protective devices?

For a continuous duty motor rated more than 1(hp) with a marked temperature rise of 40 (C) or less, a separate overload device must be rated at no more than what percentage of the motor nameplate full-load current rating?

Where are conductors prohibited from being installed in precast cellular concrete floor raceways?

If unusual type loads or duty cycles permit reduced-size conductors for industrial machinery, where must the required capacity be included?

Capacitors must be provided with a means of doing what to stored energy?

Where transformers are replaced in a marina, the transformers and enclosures must be identified for which type of location?

What is the minimum trade size permitted for NUCC?

What condition is required regarding the grounding of secondary circuits for low-voltage fixed electric space-heating equipment?

Cartridge fuses in circuits of any voltage, and all fuses in circuits over 150 volts to ground, must be provided with what device on their supply side?

An equipotential plane shall be installed adjacent to outdoor service equipment or disconnecting means that control equipment in or on water if the equipment is located within what distance of the body of water?

What must LFMC suitable for direct burial be marked with?

When operating portable and vehicle-mounted generators, exhaust must be vented away from structures and other areas where what might occur?

The main disconnecting means for an irrigation machine must provide overcurrent protection, be readily accessible and lockable open in accordance with 110.25, and be located where?

Overcurrent protection provided by an assembly listed for fire pump service shall not open within what time frame when subjected to 300 percent of the full-load current of the fire pump motor(s)?

What is the maximum number of elevators permitted on a single feeder before the demand factor reaches its minimum value?

Overcurrent protective devices supplying a fire pump in a multibuilding campus-style complex must be selectively coordinated with all supply-side overcurrent protective devices, and this selection must be performed by whom?

Where a swimming pool luminaire operates over the low-voltage contact limit, the connected junction box must be located not less than what minimum vertical distance above the pool deck or ground level?

If nonmetallic raceways are used for permanent wiring, they must be encased in not less than what minimum thickness of concrete?

When calculating the lighting load for mobile homes, the calculation is based on 33 volt-amperes/m2 (3 VA/ft2) times the outside dimensions of the mobile home, excluding what dimension?

What is the requirement for plugs and receptacles used to connect power-supply cords to information technology equipment?

Screwless terminals of the conductor push-in type construction on receptacles shall be installed on branch circuits not greater than what ampere rating?

For power conductors below communications conductors on poles, what is the minimum required horizontal climbing space?

A separate control device, in addition to the disconnecting means, shall be incorporated in the X-ray control supply or in the primary circuit to what component for fixed and stationary equipment?

Which 125-volt, single-phase receptacle rating requires a listed Class A GFCI type when installed in elevator pits?

ENT is prohibited where subject to ambient temperatures in excess of what value, unless listed otherwise?

When installing neon secondary-circuit wiring over 1000 volts in conduit or tubing, what is the maximum number of conductors permitted in the raceway?

If spans longer than 3.7 m (12 ft) are required for Cablebus, what condition must be met?

For electroplating systems exceeding 60 volts direct current, insulated conductors are permitted to be run on insulated supports, provided they are protected from what?

Adjacent areas (such as stock rooms or electrical control rooms) in aircraft hangars shall be unclassified where mechanically ventilated at a rate of what minimum number of air changes per hour?

All receptacles installed in a wet location for electric vehicle charging shall have an enclosure that is weatherproof when what condition is met?

What is the minimum required distance from live parts to ground for a system rated not over 250 Volts, nominal?

What is the minimum conductor size permitted within a listed component or as part of the wiring of a listed assembly?

Are phase converters permitted to supply power to a fire pump?

Where must a sign be placed for a permanently installed Optional Standby Power Source in one- and two-family dwelling units?

Where the term “Class I” is used with respect to Zone classifications within Article 511, what Zone designations does it apply to?

To whom shall access be restricted for the electrical circuits and equipment related to Critical Operations Power Systems (COPS)?

Where must the required surge-protective device (SPD) be installed?

For electrical installations operating at 1001 volts to 2500 volts, what is the minimum clear distance required between a fence enclosure and exposed live parts?

A box or conduit body is NOT required where Type MI cable uses what specific fittings for straight-through splices?

Unless specifically listed for locations containing deposits of dangerous quantities of residues, what types of wiring are permitted in any spray area where combustible residue could readily accumulate?

The main overcurrent protective device that feeds the floating building shall have ground-fault protection not exceeding what current value?

What is the maximum current calculation method for Power Source Output where not elsewhere required, if the equipment is not controlled by an EMS?

For low-voltage wiring in a park trailer, what metal component is permitted as the return path to the source of supply?

When reconditioned equipment is required to be listed by the Code, which action must be taken?

What type of flexible cord is permitted as a connection for the top-of-car operating device?

Backfill is prohibited from containing large rocks, paving materials, cinders, large or sharply angular substances, or what other type of damaging material?

Which type of branch circuit is permitted to supply any volt-ampere or wattage rating of fixed industrial process heating equipment for which the branch circuit is rated?

Which wiring method is permitted for connecting auxiliary electrical equipment mounted on an electrolytic cell to premises wiring systems?

The two to six service disconnecting means permitted are permitted to consist of service disconnects in switchgear, transfer switches, or metering centers, provided each disconnect is located where?

In Zone 2 locations, space heaters used to reduce condensation must have an exposed surface temperature that does not exceed what maximum percentage of the autoignition temperature in degrees Celsius of the gas or vapor involved?

A resistance-type boiler employing immersion heating elements contained in an ASME-rated and stamped vessel must have the heating elements protected at not more than what maximum ampere rating?

The 3 ft. clearance requirement between the top of the equipment and a combustible ceiling does not apply if what alternative is provided?

Where grounded conductors of different nominal voltage systems originate, the means of identification used must be documented in a manner that is readily available or must be permanently what?

Which insulation color is permitted to identify a grounded conductor of 6 AWG or smaller?

The equipment grounding conductor of the supply circuit shall be permitted to serve as the bonding means if the metal frames or parts are likely to become energized in the event of what?

What is the maximum size conductor generally permitted to be installed in cellular concrete floor raceways?

For an Optional Standby System utilizing manual or nonautomatic load connection, whose responsibility is it to select the load connected to the system?

A bonding conductor must be connected between the panelboard and what other accessible terminal on the chassis of a relocatable structure?

Process-connected electrical equipment that incorporates a single process seal must be provided with an additional means to mitigate a single process seal failure. Which of the following is not listed as a possible additional means?

A permanent nameplate for industrial machinery must be attached to the outside of the control equipment enclosure or immediately adjacent to it, and what other characteristic must it possess?

In Zone 2 locations, open or nonexplosionproof/nonflameproof enclosed motors (such as squirrel-cage induction motors without brushes or switching mechanisms) are permitted if they are not identified for use in Zone 2, due to what characteristic?

What is required to be provided to disconnect simultaneously all ungrounded single-phase supply conductors to the phase converter?

For electric cranes, hoists, and similar equipment operating over combustible fibers/flyings, the power supply to contact conductors must be electrically isolated from all other systems, ungrounded, and equipped with an acceptable ground detector that gives an alarm and automatically does what?

Which generation system is permitted to be connected to premises wiring without a grounded conductor, provided the connected premises wiring or utility system includes one?

For calculating the number of lighting branch circuits in a mobile home, the load shall be based on what value per square meter?

For which size conductors is protection against abrasion referenced in an informational note regarding EMT entry into an enclosure?

Circuits in a wind electric system connected to more than one electrical source shall have overcurrent devices located to provide protection from which sources?

A receptacle or switch with integral enclosure and mounting means is permitted to be installed in manufactured buildings if it is what?

What is the maximum distance two pieces of equipment can be separated while still being considered “in sight from” (within sight)?

Where there is no machine room or control room outside the hoistway, where must the overcurrent device protecting the car lights branch circuit be located?

To reduce sparking in electric cranes and hoists used over combustible fibers/flyings, what minimum number of separate surfaces of contact must be provided for each contact conductor?

To minimize mechanical strain on battery terminals, what may conductors be pre-formed to eliminate?

For electroplating systems not exceeding 60 volts direct current, insulated conductors are permitted to be run without insulated support, provided they are protected from what?

When flexible bus systems are reduced in size, where is overcurrent protection required?

All 125-volt receptacles used for 60/120-volt technical power must have a unique configuration and be identified for use with this class of system, except for which locations where standard receptacles are permitted?

Where are angle connectors prohibited from being used with LFNC?

The electrical loads within a large-scale PV electric supply station are restricted to powering what type of equipment?

How can extensions be made from metal wireways?

A grounded conductor’s electrical continuity shall not depend on a connection to which of the following?

The radius of the curve to the centerline of bends in HDPE conduit (for sizes smaller than metric designator 129) shall not be less than shown in which table?

What is the minimum bending radius required for nonshielded conductors during or after installation?

Portable feeder cables are permitted to temporarily penetrate fire-rated walls, floors, or ceilings if the opening is made of noncombustible material, the penetration is sealed with a temporary listed firestop material when in use, and what is required when the penetration is not in use?

What type of ENT is required when exposed to the direct rays of the sun?

What is the required color identification for Isolated Conductor No. 2 in an isolated power circuit?

Multiple power sources of the same type connected in parallel to form one system supplying premises wiring shall be treated as what?

If an appliance is supplied by more than one branch circuit or feeder, what must be provided for the disconnecting means?

When extending through dry walls, dry partitions, or dry floors, what condition is required regarding the length of surface metal raceway passing through?

When auxiliary equipment for electric-discharge lamps is supplied by the ungrounded conductors of a circuit, the switching device must simultaneously disconnect all which conductors?

Where must metal covers used on pull boxes, junction boxes, and conduit bodies be connected?

When remote disconnect controls are used for electronic equipment power and HVAC systems, what is permitted regarding the grouping of controls?

Which of the following is a permitted use for Cablebus?

Flexible cords are permitted in show windows and showcases as supply cords for portable luminaires and other displayed merchandise, or for which other wiring use?

If cables operating over 1000 volts are installed in the same tray as cables 1000 volts or less, the high voltage cables must either be Type MC or what must separate them?

For track lighting in commercial occupancies, what is the additional load that must be included for every 600 mm (2 ft) of lighting track or fraction thereof?

The equipment branch in a Type 1 EES must be installed and connected to the alternate power source such that the automatically connected equipment is restored to operation at appropriate time-lag intervals following the energizing of which two other branches?

If a DC system is supplied by a 3-wire balancer set, the grounding electrode conductor shall not be smaller than the neutral conductor and not smaller than what minimum copper size?

If fire pump feeder conductors are routed through a building, they must be protected from fire for 2 hours using what minimum concrete encasement thickness?

What protection must be provided for all 15- and 20-ampere receptacles used as a means of connecting equipment in the 60/120-volt system?

When are service-entrance conductors for manufactured buildings permitted to be installed prior to the erection at the building site?

Are equipotential planes required for the controlled equipment itself (e.g., pumps, controls) that is supplied by the service equipment or disconnecting means in a body of water installation?

Connectors used to connect lengths of portable cable over 600Volts up to 2000Volts in a run must be of a type that performs which action?

Replacement electrical connections on a fixed or floating structure shall be located at least how far above the deck?

What minimum thickness of concrete encasement is required when using Schedule 40 PVC conduit, flexible nonmetallic or jacketed metallic raceways, or jacketed metallic cable assemblies for LSB/CB wiring?

Pendant lampholders shall not be installed in which areas of a facility covered by Article 520?

Neon tubing shall be supported within what maximum distance from the electrode connection?

Aircraft energizers (external power sources for aircraft) must be designed and mounted such that all electrical equipment and fixed wiring will be at least what minimum height above floor level?

Where flammable gases or vapors are released from cannabis oil equipment (other than booths), the space within 3 ft. in all directions and extending to the floor or grade level shall be classified as what?

What is the minimum number of dwelling units required to use the optional multifamily dwelling calculation (220.84)?

The insulated copper equipment grounding conductor that is an integral part of the flexible cord supplying a wet-niche swimming pool luminaire shall not be smaller than the supply conductors and not smaller than what minimum size?

What is the maximum length permitted for feeder tap conductors that must have an ampacity not less than one-third of the rating of the overcurrent device protecting the feeder conductors?

Bare conductors for indoor low-voltage installations must not be installed less than what minimum height above the finished floor, unless specifically listed for a lower installation height?

Cellular metal floor raceways or cellular concrete floor raceways are permitted only for supplying ceiling outlets or extensions to the area below the floor, and such raceways shall have no connections leading into or through what type of location above the floor?

What is the maximum load permitted on a single conductor portable feeder cable?

In a completed seal, what is the minimum required thickness of the sealing compound, in the absence of other thickness limitations?

The interrupting rating of power fuses shall not be less than what value?

If a switch is connected to circuits inherently capable of providing a backfeed source of power, allowing load-side terminals to be energized when the switch is open, what specific warning sign must be installed?

The rating of a receptacle or of a separable connector used as a disconnecting means shall not be less than what rating?

What marking must metal wireways have that will be visible after installation?

If metal conduit is used for underground wiring in a classified location, electrical wiring below the surface of the classified location must be sealed within what distance of the point of emergence above grade?

Where a phase converter supplies specific fixed loads and conductors are sized per 455.6(text{A})(2), the conductors must be protected in accordance with their ampacity, but the overcurrent protection shall not exceed what maximum percentage of the phase converter nameplate single-phase input amperes?

All used or reconditioned X-ray equipment moved to and reinstalled at a new location shall be of what type?

When the highest continuous current trip setting for a circuit breaker is 1200 amperes or higher, which method is specifically prohibited for temporary adjustment to achieve arc energy reduction?

Neon secondary conductor(s) shall be supported not more than how far from the electrode connection to the tubing?

An insulated grounded conductor that is 4 AWG shall be identified by which of the following means?

For a negative polarity ungrounded conductor of a dc feeder system (6 AWG or smaller) that does not serve as the grounded connection, which of the following is NOT permitted as an identification means?

The length and design of neon tubing shall not cause a continuous overcurrent beyond which limit?

Areas adjacent to classified locations (such as stock rooms or switchboard rooms) shall be unclassified where mechanically ventilated at a rate of four or more air changes per hour, designed with positive air pressure, or what else?

Where ladder or ventilated trough cable trays having a usable inside depth of 150 mm (6 in.) or less contain only multiconductor control and/or signal cables, what is the maximum fill percentage permitted?

The sum of the cross-sectional area of the individual conductors in a metal or nonmetallic wireway shall not be more than what percentage of the interior cross-sectional area of the wireway?

Where passing through wood cross members in plastered partitions, conductors must be protected by noncombustible, nonabsorbent insulating tubes extending how far beyond the wood member?

Runway contact conductors shall be guarded, and bridge contact conductors shall be located or guarded in such a manner that persons cannot inadvertently touch what?

When supplying two dwelling units with a single feeder, if the calculated load using Part III exceeds the load calculated for three identical units using 220.84, which load is permitted to be used?

What is required regarding the electrical continuity of the header?

All branch circuits serving patient care spaces must be provided with an effective ground-fault current path by installation in a metal raceway system or a cable having what type of assembly?

The conductors in messenger-supported wiring shall not be permitted to come into contact with the messenger supports or which other surfaces?

Where a swimming pool luminaire operates over the low-voltage contact limit, the connected junction box must be located not less than what minimum vertical distance above the maximum pool water level?

In a park trailer, ground connections to the chassis or frame must be cleaned and free from oxide or paint, or electrically connected through the use of what specific type of washer?

For conductor sizing purposes in a wind electric system, wind turbine electric system currents shall be considered what type of current?

In Class I, Division 1 locations, Type MC-HL, Type TC-ER-HL, and Type P cables shall be sealed with a listed fitting after the jacket and any other covering have been removed so that the sealing compound can surround what component?

For DC power resistors used for constant voltage DC motors, if the resistor duty is “Continuous Duty” according to Table 430.29, what is the minimum ampacity percentage required for the conductors?

The receptacle supplying a cord-and-plug-connected range hood or microwave oven/range hood combination must be supplied by what specific circuit configuration?

What is the minimum required gutter width for deflecting a 2 AWG copper conductor (All Other Conductors) with only one wire per terminal in a cabinet or cutout box?

For bonded portable generators / 15(kW) or smaller), where must GFCI protection be provided?

What is the minimum number of intersystem bonding conductors an Intersystem Bonding Termination (IBT) device must have capacity for?

For infrequent flexing use of metric designator 16 (trade size 1/2) FMT, what is the minimum radius (in mm) of bends measured to the inside of the bend?

Wet procedure locations must be provided with special protection against electric shock by either isolated power systems or a power distribution system in which the power supply is interrupted if the ground-fault current exceeds what value?

For a permanently installed outdoor housed generator set, if the readily accessible disconnecting means is located within sight of the building supplied, is an additional disconnecting means required where ungrounded conductors pass through the building?

In concrete or poured masonry installation, heating panels or heating panel sets shall not be installed where they bridge expansion joints unless provision is made for what?

When PVC, RTRC, or HDPE conduit is used underground, what type of metal conduit must be used for the last 2 ft. of the underground run to emergence?

Overcurrent protection for a busway used as a feeder shall be provided in accordance with what?

The vertical clearance above a roof surface must be maintained for a minimum distance of what measurement in all directions from the edge of the roof?

In land areas subject to tidal fluctuations, the electrical datum plane for a recreational vehicle park must be what distance above the highest high tide level occurring under normal circumstances?

Group IIA atmospheres contain materials like methane, propane, and gasoline and are equivalent to which Class I Group classification?

Electrical equipment shall be installed in what type of manner?

Organic material that is carbonized or excessively dry is highly susceptible to what specific hazard?

Where must splices and taps be made within the ENT system?

How is the maximum circuit current calculated for an ESS inverter output circuit?

For individual open conductors exposed to the weather and operating at 1000 volts, what is the minimum required distance between supports when conductors are separated by 150 mm (6 in.)?

What is the minimum AWG size required for a contact wire if the distance between end strain insulators is 9.0 m (30 ft)?

Interior metal water piping used to extend the connection to an electrode must be located not more than what maximum distance from the point of entrance to the building?

PVC conduit is permitted in locations subject to severe corrosive influences, provided it complies with 300.6 and what other condition?

Where must all system components for a germicidal irradiation system be sourced from, if not provided by the system manufacturer?

What specific warning must be marked on a Source Disconnecting Means if the line and load terminals are capable of being energized in the open position?

Where a feeder supplies branch circuits requiring equipment grounding conductors, the feeder must include or provide an equipment grounding conductor to which what conductors shall be connected?

Open conductors must be separated at least what minimum distance from metal raceways, piping, or other conducting material?

When calculating farm loads for buildings other than the dwelling unit, what percentage applies to the Next 60 amperes of all other loads (at 240 Volts Maximum)?

If a motor rated more than 1(hp) has a motor full-load current greater than 20(amperes), the ultimate trip current of a thermally or electronically protected motor shall not exceed what maximum percentage of motor full-load current?

Extra-hard usage portable power cable is permitted to be used as permanent wiring on the underside of which type of pier?

The conductors in portable power feeder cables over 2000Volts must be copper or larger than what size AWG?

When feeders are derived from an autotransformer, the supplied system must have a grounded conductor electrically connected to a grounded conductor of the supply system, unless the transformation is between which nominal voltages?

Free nonheating leads of cables must be installed from the junction box to a location within the ceiling using which wiring methods?

If an industrial control panel is supplied by more than one electrical source and requires multiple disconnecting means to de-energize all circuits 50(volts) or more, what must the panel be marked to indicate?

The number of conductors or cables permitted in EMT shall not exceed the percentage fill specified in which table?

If permitted reconditioned equipment has been damaged by corrosive influences or water, who must specifically evaluate it prior to being returned to service?

For a single Solar PV system requiring rapid shutdown, which device is not permitted to serve as an initiation device?

What is the minimum ampere rating required for receptacles in DC plugging boxes?

What identifies the grounded conductor in multiconductor flat cable with conductors that are 4 AWG or larger?

For battery chemistries with corrosive electrolyte, metallic support structures must be provided with what specific component for the cells, or be constructed with a continuous insulating material?

What is the maximum trade size (metric designator) permitted for RTRC?

The intrinsic safety type of protection “ic” in Zone 22 locations permits the use of simple apparatus not shown on the control drawing, provided it does not interconnect the intrinsic safety circuit to what?

The disconnecting means used to isolate each boat from its supply connection(s) shall consist of which of the following?

If a separate equipment grounding conductor is used for branches from busways, which NEC sections must the connection of the EGC comply with?

What is the minimum spacing required between the lowest surface of the roof decking and the top of a luminaire installed in exposed or concealed locations under roof decking where subject to physical damage?

Which color shall the identification of terminals to which a grounded conductor is to be connected be in devices or utilization equipment with polarized connections?

A junction box connected to a forming shell for a swimming pool luminaire must be located not less than what horizontal distance from the inside wall of the pool?

Separation between intrinsically safe and nonintrinsically safe circuit conductors in raceways, cable trays, or cables is not required if all conductors of either circuit type are contained in what type of cable?

Where must the disconnecting means for a transformer (other than Class 2 or Class 3) be located?

When installing Class 2 and Class 3 Circuit conductors in enclosures with electric light or power circuits, what minimum separation distance must be maintained if voltage is not 150 volts or less to ground?

When running conductors in parallel, what must be true about the insulation type of all paralleled conductors that comprise each ungrounded conductor, grounded conductor, neutral conductor, equipment grounding conductor, equipment bonding jumper, or supply-side bonding jumper?

Factory-wired multimotor and combination-load equipment must be marked with the minimum supply circuit conductor ampacity and what other rating?

For a multispeed motor, the selection of branch-circuit conductors on the line side of the controller must be based on what rating?

In industrial occupancies, autotransformers are permitted to supply nominal 600-volt loads from nominal 480-volt systems without a connection to a grounded conductor, provided what condition is met regarding personnel?

What limit applies to the maximum number of conductors or cables in NUCC?

What type of bushings shall NOT be used for flexible cord pendants passing through covers of outlet boxes and conduit bodies?

If field-installed skeleton tubing is readily accessible to other than qualified persons, it must be protected by which means?

Motor overload devices, other than fuses or thermal protectors, must simultaneously open a sufficient number of ungrounded conductors to interrupt what?

How many minimum volt-amperes must be calculated for each required branch circuit supplying sign and outline lighting?

For capacitor installations over 1000 Volts, switches must be capable of carrying continuously not less than what minimum percentage of the rated current of the capacitor installation?

The splice connection between the nonheating lead and heating element within concrete, masonry, or asphalt shall be located no more than what maximum distance from the metal raceway?

If a floating building has multiple occupancy, how many sets of feeder conductors are permitted to supply each occupant?

What is the maximum current rating for devices (other than polarized plugs/receptacles) that are required to have grounded conductor terminal identification?

Where electrical distribution equipment is located on land to serve a fish farm pond, and the live parts are elevated a minimum of 300 mm (12 in.) above the electrical datum plane, what minimum horizontal distance from the shoreline is required?

A fuel cell system must be listed for the application or meet what alternative requirement for approval?

Group IIC atmospheres include acetylene and hydrogen and are equivalent to a combination of which two Class I Division groups?

For electroplating systems not exceeding 60 volts direct current, bare copper or aluminum conductors are permitted under what condition?

Solar PV conductors not greater than 3 m (10 ft) in length and not in buildings are permitted to be protected from overcurrent on one end, provided they meet which condition?

For explosionproof enclosures in Class I, Division 1 locations containing terminals, splices, or taps, a conduit seal is required if the conduit entry is metric designator 53 or larger, which corresponds to what minimum trade size?

For arc and xenon projectors of the professional type, conductors supplying outlets shall not be smaller than what minimum AWG size?

Nonmetallic cabinets must be listed, or they shall be submitted for what prior to installation?

What restriction applies to joints in vertical runs of nonmetallic wireways between supports?

What must be installed or made to the wiring methods used for extensions from a nonmetallic wireway?

In dwelling units, the nominal voltage between conductors supplying the terminals of luminaires shall not exceed what value?

If showcases are cord-connected, the secondary circuit(s) of each electric-discharge lighting ballast shall be limited to how many showcases?

For temporary branch circuits installed for holiday decorative lighting, single insulated conductors are permitted provided the voltage to ground does not exceed what value?

What is the maximum output voltage permitted for a listed DC power supply used to supply power to a pipe organ?

The EGC installed with feeder taps shall not be required to be larger than which conductors?

Walking surfaces directly below the outdoor service equipment (within 900 mm/36 in.) that controls equipment in or on water must be bonded to the equipotential plane using wire mesh or other conductive elements placed how far under the walk surface?

Which of the following is permitted to be used as the disconnecting means for a dc power supply in an electroplating system?

Where ungrounded conductors are supplied from multiple nominal voltage systems, the method used for identification originating within the branch-circuit panelboard must be documented and permanently posted. This label must be of sufficient durability and must not be:

For an ungrounded AC service, where is the grounding electrode conductor connected?

In addition to the requirements of Article 470, the installation of oil-filled reactors shall comply with applicable requirements of which two specific Parts of Article 450?

Where a luminaire is provided over a bathtub or in a shower stall in a park trailer, it must be of the enclosed and gasketed type, listed for the installation type, and what other mandatory protection?

Where raceways and cables are installed into the bottom of open bottom equipment, such as switchboards or motor control centers, they are NOT required to be what?

Which of the following is a permitted use for Type AC cable?

In a working space intended for equipment operating over 1000 volts, if equipment is less than 1.8 m (6 ft) wide, what entrance requirement applies?

In outdoor swimming pool areas, luminaires installed above the pool or within 1.5 m (5 ft) horizontally must be installed at a height not less than what distance above the maximum water level of the pool?

Where are splices or taps permitted within auxiliary gutters?

A junction box connected to a conduit that extends directly to a forming shell of a swimming pool luminaire must be provided with a number of grounding terminals that shall be no fewer than what quantity?

For portable cables rated over 600Volts up to 2000Volts, the copper conductors shall not be smaller than which AWG size?

Where Wireless Power Transfer Equipment (WPTE) includes a control box, it must be suitable for the environment and mounted at a height not less than how far above the floor level for indoor locations?

The lighting switch for hoistway pit lighting shall be so located as to be readily accessible from what location?

A listed emergency shutoff device or electrical disconnect for a marina power outlet must be clearly marked with which words in accordance with 110.22(A)?

In addition to being identified as suitable for wall installation, heating panels installed in walls must be protected by which two specific devices?

Every truck parking space with electrical supply must be equipped with a maximum of how many 20-ampere, 125-volt, 2-pole, 3-wire grounding type receptacles?

What is required to protect all through-wall penetrations for Class 2 conductors?

The flexible cord for cord-and-plug connected equipment of a permanently installed swimming pool must have a copper equipment grounding conductor sized in accordance with 250.122 but not smaller than what size?

Class III, Division 2 locations include locations where ignitible fibers/flyings are stored or handled, other than during what process?

Dispensing devices for LP-Gas may be located at least 5 ft. from any Class I liquid dispensing device if the LP-Gas nozzle and filler valve release no more than 4text{ cm}^{3} / 0.1text{ oz}) of liquid upon disconnection, and what other condition exists?

How is the type, size, and quantity of conductors used in prewired manufactured assemblies identified?

If a short-circuit and ground-fault protective device is used for both windings of a part-winding motor (Exception), and time-delay (dual-element) fuses are used, what is the maximum permissible rating?

Overload protection for motor-compressors and equipment used on 15text{-} or 20(ampere), 120 volt , or 15(ampere), 208text{-} or 240 volt , single-phase branch circuits that are not cord- and attachment-plug-connected is permitted in accordance with 440.54. What must the short-circuit and ground-fault protective device protecting the branch circuit have?

Documentation classifying areas as hazardous or unclassified must be made available to the AHJ and whom else?

Which of the following markings is required to be attached to either the inside or outside of the industrial control panel enclosure?

If a mobile home power-supply cord is rated 50 amperes, what specific marking must the cord bear?

Where shall aircraft batteries not be charged if they are installed in an aircraft?

The rated-load current in amperes of the motor-compressor must be marked by the equipment manufacturer on which component(s)?

The values given in Tables 430.247 through 430.250 shall be used instead of the actual current rating marked on the motor nameplate to determine the ampacity of conductors and current ratings of switches, except for which types of motors?

Where caution, warning, or danger hazard markings are required by the Code, how must the marking be applied?

When cables are installed in a dedicated cable tray for welding cables, the cable tray shall provide support at intervals not greater than what distance?

What is the minimum unit load required for general lighting calculations in a Fire station, in volt-amperes/ft²?

What is the minimum required size for underground service conductors made of copper?

What is the required class of fit for metric-threaded fittings installed into explosionproof equipment?

Where flammable gases or vapors are released within a cannabis oil booth, how is the space within 3 ft. of any opening classified?

For a permanently connected appliance rated at not over 300text{ volt-amperes} or 1/8(hp) , when can the branch-circuit overcurrent device serve as the disconnecting means?

Which TRU receptacle rating listed is permitted to be 3-phase, 3-pole, 4-wire and 1000 volts?

Individual dry-type transformers of more than 112.5(kVA) rating must be installed in a transformer room of fire-resistant construction having what minimum fire rating?

In addition to 210.8, what protection must be provided for heating cables installed under floor coverings?

Tap conductors running from a recessed luminaire terminal connection to an outlet box placed at least 1 ft. away must be run in suitable raceway or Type AC or MC cable of what minimum length?

Where written safety procedures are in place for industrial installations with supervision, the runway conductor disconnecting means for electrolytic cell lines is permitted to be placed out of view of the runway contact conductors, provided that only which personnel service the equipment?

Which circuit is permitted to be connected on the supply side of the service overcurrent device where separately provided with overcurrent protection?

Where two or more motors are used together, or where one or more motors are used in combination with other loads, the rating of the disconnecting means shall be determined from the sum of all currents at the full-load condition and also at what other condition?

If the rated short-time withstand current duration is greater than 2 seconds, what must be marked on the IBP?

Where a building with more than one occupancy has a single service, one set of service-entrance conductors is permitted for each service run to each occupancy or group of occupancies, provided the number of service disconnect locations for any given classification does not exceed what number?

What is the maximum length permitted for secondary circuit conductors from a high-voltage terminal to the first neon tube electrode if installed in nonmetallic conduit?

Luminaires that have exposed ballasts, transformers, LED drivers, or power supplies shall be installed such that these components are not in contact with combustible material unless what condition applies?

For solidly grounded systems over 1000 volts, what is considered the maximum continuous operating voltage for surge arrester rating selection?

For a grounding autotransformer used as a ground reference for fault protection devices, the overcurrent protective device must open simultaneously which conductors?

Is overcurrent protection required for a common return conductor in a pipe organ circuit?

What is the maximum overall usable length permitted for the cord and cable of the EVSE unless equipped with a listed cable management system?

A load where the maximum current is expected to continue for 3 hours or more is known as a/an:

What is the minimum required duration of the on-site fuel supply for a generator serving a Legally Required Standby System?

Where a circuit supplies portables or pendants and includes a grounded conductor, the grounded conductor of the flexible cord shall be connected to the screw shell of any lampholder or to what component of any utilization equipment supplied?

For an arc welder with a 30 percent duty cycle, which type of welder requires a larger multiplier for determining minimum supply conductor ampacity?

When insulated conductors are deflected within a nonmetallic wireway greater than 30 degrees, which table dimension applies?

Provisions for supports or other mounting means for nonmetallic boxes shall be installed where?

Where high-voltage secondary circuit conductors emerge from permitted wiring methods, they shall be enclosed in what component?

Insulators used to support conductors over 1000V must be rated for applied phase-to-phase voltage, mechanical strength, and what impulse rating?

In Category 2 spaces, all required receptacles must be listed and identified as what specific grade?

Nonshielded single-conductor cables with insulation types up to 2000 volts listed for direct burial are permitted to be directly buried only in which location type, provided maintenance ensures only qualified persons service the cable?

Where Wireless Power Transfer Equipment (WPTE) is fastened-in-place, how is the output cable to the primary pad measured?

What type of protection must adjustable-speed drive systems provide, in addition to conductor protection required in 430.32, where the motor is not rated to operate at the nameplate rated current over the speed range required by the application?

A motor secondary circuit has a duty cycle of 15 seconds On and 30 seconds Off. To determine the minimum size of the secondary resistor conductors, the motor secondary current must be multiplied by what percentage factor from Table 610.14(B)?

Is PVC conduit permitted for the support of luminaires?

Where must the instructions for the course of action to be taken in the event of an indicated ground fault be located for a Legally Required Standby System?

Where motor controller enclosures have provisions for one or two wires per terminal, the wire-bending space must comply with which specific NEC section?

When grounding metal enclosures for the DC cell line process using a grounding electrode conductor, what is the minimum required size if copper is used?

What must be avoided in IBP systems to eliminate the possibility of galvanic action?

In a Solar PV power source employing a common-return conductor with multiple output circuit voltages, the ampacity of the common-return conductor shall not be less than what summation?

For constant voltage DC motors, conductors connecting the motor controller to separately mounted power accelerating and dynamic braking resistors must have an ampacity not less than the value calculated from Table 430.29 using what current rating?