2023 Commercial Electrical Inspector – Flashcards

What is the maximum spacing permitted for warning notices on high voltage cable trays?

IBP systems shall not be used in any hazardous (classified) location except when?

If wiring located above a heated ceiling is situated above thermal insulation having a minimum thickness of 2 in. or more, what is it subject to?

If boxes, conduit bodies, outlet box hoods, and fittings are installed in wet locations, they shall be what?

Openings through which conductors enter cabinets, cutout boxes, or meter socket enclosures must be closed in what manner?

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?

Where demand factors from Table 220.120 are applied to shore power receptacles in marinas, which demand factor specified in 220.61 is NOT permitted?

A soldered connection to busbar grid rails must be made how before being soldered?

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?

If showcases are cord-connected, the secondary circuit(s) of each electric-discharge lighting ballast shall be limited to how many showcases?

Knob-and-tube wiring shall not be used in hollow spaces of walls, ceilings, and attics where such spaces are insulated by what types of material?

Where equipment receives electrical power from more than one source on a multicar installation, how many disconnecting means must be provided?

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

Which cable types listed in Table 770.154(a) are explicitly not permitted to be installed in risers (vertical runs)?

Where single conductor cables of an AC circuit are connected in parallel, how must the conductors be installed in metal wireways?

Where must the nameplate for fixed industrial process heating equipment be located?

Where is the listed ground-fault circuit interrupter (GFCI) permitted to be installed to protect a feeder in lieu of the GFCI provisions specified in 210.8 and 590.6(A)?

Transformer secondary conductors of a separately derived system are permitted to be installed without ground-fault protection if they do not exceed what length and are installed in a raceway?

Ventilating pipes for rotating electrical machinery or enclosures in Class III locations must lead directly to a source of clean air where?

What physical condition is noted as potentially causing some nonmetallic conduits to become brittle and more susceptible to damage?

Pendant lampholders shall not be installed in which areas of a facility covered by Article 520?

What is the minimum conductor size permitted for communications circuits in traveling cables?

The conductors in messenger-supported wiring shall not be permitted to come into contact with the messenger supports or which other surfaces?

When raceways contain 4 AWG or larger insulated circuit conductors, what is one permitted method of protecting the conductors where they enter a cabinet, box, or enclosure?

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?

What is the minimum clearance required between a recessed fluorescent luminaire installed in the wall or ceiling and the nearest point of the clothes closet storage space?

How must all Critical Operations Power Systems (COPS) sources of power be grounded unless they fall under a specified exception related to feeder wiring?

Power distribution blocks installed in metal wireways must meet what listing requirement?

For household-type appliances with surface heating elements having a maximum demand of more than 60(amperes), the power supply must be subdivided into how many circuits?

When are expansion fittings required in auxiliary gutters?

If service conductors have an ampacity of 55 amperes or less and the feeder conductors carry the total load supplied by those service conductors, the feeder conductor ampacity shall be not less than what value?

What type of overcurrent protective device must be provided for both ungrounded conductors in all feeders and branch circuits of the 60/120-volt system?

How is the branch-circuit load calculated for a counter-mounted cooking unit and one wall-mounted oven supplied from a single branch circuit and located in the same room?

Group IIC atmospheres include acetylene and hydrogen and are equivalent to a combination of which two Class I Division groups?

Direct-current conductors in electroplating systems shall be protected from overcurrent by one or more of the following: Fuses or circuit breakers, a current-sensing device that operates a disconnecting means, or what other method?

Where two or more motors have the same highest rated-load current, how many of them are considered the highest rated (largest) motor?

Where HDPE conduit is intended for direct burial without concrete encasement, what additional capability must the material possess regarding loading?

Flexible cords listed in Table 400.4 are permitted to be surface marked to indicate special characteristics, including limited smoke and what other characteristic?

What is the maximum vertical spacing interval for supporting 6 AWG copper conductors in a vertical raceway?

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?

When must the markings on flexible bus systems be visible?

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

Collectors shall be designed so as to reduce to a minimum what operational issue between them and the contact conductor?

When installing neon secondary-circuit wiring over 1000 volts in conduit or tubing, what is the maximum number of conductors permitted in the raceway?

External surfaces of pipeline and vessel heating equipment that operate at temperatures exceeding 60 (C) / 140 (F) must be protected against contact by personnel by what means?

What is one of the permanent wiring methods permitted for general use in motion picture and television studios?

If multiple interrupter switches are installed with interconnected load terminals for alternate connection to different supply conductors, what must each switch be provided with?

What is the required configuration rating for the 3-pole, 4-wire, grounding-type attachment plug cap used for mobile home supply cords?

Amplifiers, loudspeakers, and other equipment must be located or protected to guard against environmental exposure or physical damage that might result in fire, shock, or what other hazard?

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?

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

According to Table 430.52(C)(1), what is the maximum percentage of full-load current permitted for an instantaneous-trip breaker protecting a Design B energy-efficient polyphase motor?

Where portions of a raceway or sleeve are known to be subjected to different temperatures, and condensation is known to be a problem, what action must be taken?

In addition to being identified as suitable for wall installation, heating panels installed in walls must be protected by which two specific devices?

For power conductors alone or above communications conductors on poles, where the voltage is 300 volts or less, what is the minimum required horizontal climbing space?

Flexible cords used in Class III locations must be of a type listed for what specific usage?

Are fittings listed for use with LFNC permitted as a means of support for the conduit?

When using fixed electrostatic equipment, goods being coated shall be supported on conveyors or hangers arranged to ensure that the parts are electrically connected to ground with a resistance of what maximum value?

Where Class I liquids or gaseous fuels are stored, handled, or transferred, a Class I location shall not extend beyond what physical barrier?

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

Using Table 625.52(B)(1)(2), what is the minimum three-phase ac ventilation requirement in cfm for one EVSE charging at 600 V (or 600Y/347 V) with a 300 A branch circuit rating?

PVC conduit is permitted for use in which two general types of locations, provided they are not prohibited by 352.12?

When a flexible cable contains 7 current-carrying conductors, what percentage of the three-conductor rating shall be used as the ampacity adjustment factor?

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?

According to Table 400.50, what is the required ground check conductor configuration for Type SHD-GC cable?

When must each run of cable tray be completed?

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?

Field-wired conductors between the heater and the supplementary overcurrent protective devices must be sized at not less than what percentage of the load served?

Which of the following occupancies is explicitly covered by Article 518?

When the output of an interconnected electric Power Source is connected to the load side of the service disconnecting means, how must the feeder ampacity relate to the power-source output circuit current?

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?

Which underground wiring method for service conductors must be identified for direct burial applications?

What demand factor percentage applies when calculating the load for 10 shore power receptacles in a marina (Table 220.120)?

Listed utilization equipment for this system must be capable of operating at a maximum of 30 volts ac or what maximum DC voltage?

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

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

What is the maximum length permitted for an unlisted conductive or nonconductive outside plant optical fiber cable within a building from its point of entrance (measured before entering an RMC/IMC enclosure)?

Which of the following is required to be included on the permanent nameplate of industrial machinery?

What specific requirement must a Microgrid Interconnect Device (MID) meet regarding overcurrent devices?

When conductors or cables rated at a higher temperature than the listed temperature rating of ENT are installed, what condition must be met regarding operation temperature?

What is the minimum AWG size permitted for the copper bonding conductor connecting multiple sources of supply that serve portable structures separated by less than 12 ft.?

In addition to the requirements of 110.21, what must be included in the marking on each length of HDPE conduit?

What information must be provided on the permanent nameplate for busway runs over 1000 volts?

Where a portable generator rated 15 kW or less uses a flanged inlet connection, is a disconnecting means required where ungrounded conductors pass through a building?

Which two power classifications are assigned to Network-Powered Broadband Communications Systems sources?

To ensure the integrity of the Emergency System source control wiring, what action must occur if a loss of integrity is detected for generators?

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

When a surface extension is made from the cover of a box, what requirement applies to the wiring method used?

Luminaires intended to emit germicidal irradiation must be listed and identified as what?

If a recreational vehicle is provided with an electrical installation intended to be energized from a 120-volt, 208Y/120-volt, or 120/240-volt, nominal, AC power-supply system, it must meet all applicable requirements of Article 551, even if it does not meet the requirements of which Part, due to its non-standard use?

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

As viewed from the front of the equipment, what is the required alternating-current phase arrangement on 3-phase buses for A, B, C phases?

To comply with the 1000 volt-ampere limitation of 522.10(A), the maximum output of power sources (other than transformers) shall be limited to 2500 volt-amperes, and the product of the maximum current and maximum voltage shall not exceed what value?

In a large-scale PV electric supply station, are disconnecting means required to be located within sight of the equipment they isolate?

Open individual (aerial) overhead conductors must be insulated for the nominal voltage if they are installed within what minimum distance of any building or structure other than supporting poles or towers?

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

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

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?

In a functionally grounded Solar PV system, the device providing GFDI protection fed by the faulted circuit must automatically cease to supply power to output circuits and interrupt the faulted PV system DC circuits from what reference?

For a single-phase hermetic refrigerant motor-compressor, what is the minimum rated-load current at 115 Volts that requires the locked-rotor current to be marked on the nameplate?

For nonmetallic surface extensions, what maximum floor level above grade is permitted for residential or office buildings?

Remote controlled temperature-actuated devices are permitted to serve as the controller but shall not be permitted to serve as what component?

In no case shall the point of attachment of overhead service conductors to a building be less than what minimum height above finished grade?

The disconnecting means must open all ungrounded supply conductors and must be designed so that no pole can be operated how?

What must be disregarded when determining the motor circuit conductor rating in accordance with 430.22?

The GFDI protection equipment for a Solar PV system must provide indication of ground faults at what type of location?

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

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?

What is the maximum horizontal distance allowed between audio system equipment supplied by branch-circuit power and the inside wall of a pool, spa, hot tub, or fountain?

If a crane has five simultaneously energized power conductors in a raceway, the ampacity of each power conductor must be reduced to what percentage of the value shown in Table 610.14(A)?

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?

For sales, storage, or rest rooms adjacent to dispensers, what is the resulting classification if there is any opening to the room within the extent of a Division 1 or Zone 1 classified location?

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?

For a static phase converter, the single-phase disconnecting means for the input is permitted to serve as the disconnecting means for the phase converter and a single load if what condition is met?

For boiler ground current detection, the circuit-interrupting device must trip if the sum of the neutral conductor and equipment grounding conductor currents exceeds an instantaneous value of what maximum percentage of the boiler full-load current?

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?

If branch-circuit wiring in a family room (dwelling unit) is extended, AFCI protection shall be provided by any of the approved means described in 210.12(A)(1) through (A)(6), or by installing a listed outlet branch-circuit-type AFCI located where?

For circuits rated 1000 Volts, nominal, or less, where shall resistors and reactors not be placed?

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

Duct heaters intended for use with elevated inlet air temperature must be identified as suitable for what specific use?

Is a fuel cell system permitted to supply a building or other structure in addition to any other electricity supply system?

Is HDPE conduit permitted for installation within a building?

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?

For tap conductors between the branch circuit and listed manual motor controllers, what is the maximum length permitted if the ampacity of the tap conductors is not less than one-tenth of the rating or setting of the branch-circuit short-circuit ground-fault protective device?

What is required to be installed on doors that provide unqualified persons access to live parts over 1000 Volts?

Ground-fault circuit-interrupter protection for personnel shall not be required for receptacles installed in Category 1 and Category 2 spaces where what plumbing fixture is installed in the patient bed location?

The grounded circuit conductor must be installed at switch locations that control lighting loads supplied by a grounded general-purpose branch circuit serving which types of spaces?

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?

Type 3 SPDs are permitted to be installed on the load side of branch-circuit overcurrent protection up to the equipment served. If specified in manufacturer’s instructions, what is the minimum conductor distance required from the service or separately derived system disconnect?

Wiring located within the cavity of a non-fire-rated floor–ceiling or roof–ceiling assembly shall NOT be secured to or supported by the ceiling assembly, including the ceiling support wires, unless what condition applies?

What is the lowest maximum operating temperature for fixture wires listed in Table 402.3?

For temporary wiring in exhibition halls, which specific requirement of Article 590 does not apply?

When securing exposed cables and conductors on ceilings and sidewalls, the installation must conform with 300.4 and 300.11, and the securing hardware must be designed and installed to avoid what?

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

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?

What type of circuits are explicitly prohibited from being connected when an Island Mode System supplies 120 volts to single-phase, 3-wire, 120/240-volt distribution equipment?

For a Legally Required Standby System ground-fault signal device where circuit-protective devices are rated 1000 amperes or more, what is the maximum setting permitted for the ground-fault current signal device?

If the voltage between conductors is 300 or less, and the roof slope is 100 mm in 300 mm (4 in. in 12 in.) or greater, what is the maximum permitted reduction in clearance above the roof surface?

Which location within a building containing a fire pump is not required to meet the fire protection requirements of 230.6(1) or (2) for supply conductors?

Where the actual measured size of a product is not the same as the nominal size, what shall be used rather than dimensions?

Which cable type is permitted under a building without installation in a raceway if it is listed for direct burial or concrete encasement?

Where the wiring space of enclosures for switches or overcurrent devices is used for conductors feeding through, spliced, or tapping off, what is the maximum cross-sectional area permitted for all conductors installed at any cross section of the wiring space?

To ensure safety, cord-and-plug-connected appliances used near an aeration pond must be grounded by means of an equipment grounding conductor in the cord and a grounding-type attachment plug, unless the appliance is what?

For circuit breakers providing overcurrent protection for individual fire pump sources, what characteristic of the trip point is mandatory?

What is prohibited from being stored in transformer vaults?

What type of assembly is LFNC-B, when provided as a prewired manufactured assembly?

When nonmetallic conduit (PVC, RTRC, or HDPE) is used for underground wiring below a classified location, what is the minimum required cover?

Receptacles shall be mounted not less than how far above the deck surface of the pier and not below the electrical datum plane on a fixed pier?

The disconnecting means for a shore power connection shall be readily accessible, located in the supply circuit ahead of the receptacle, and located not more than how far from the receptacle it controls?

What must be provided for testing all Critical Operations Power Systems (COPS) to ensure proper operational capability?

What is the minimum height required for the signal word “WARNING” on the safety label affixed to the exterior skin at the electrical entrance of a park trailer?

All metal parts in contact with the water and other non-current-carrying metal parts likely to become energized must be bonded using solid copper conductors not smaller than which size?

Nonmetallic raceways exposed to sunlight must be listed as what?

Every professional-type projector shall be located within what specific structure?

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

Nonheating power supply leads for exposed equipment shall be enclosed in a rigid conduit, intermediate metal conduit, electrical metallic tubing, or what other means?

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

Fuseholders of the Edison-base type shall only be installed where they are made to accept what type of fuses by the use of adapters?

What is the minimum required thickness for the nonmetallic jacketing material used in irrigation cable?

Equipment intended to interrupt current at fault levels must have an interrupting rating at nominal circuit voltage at least equal to what?

When portable power cables pass through structural members, they must be protected against chafing by which method?

Motor overload devices, other than fuses or thermal protectors, must simultaneously open a sufficient number of ungrounded conductors to interrupt what?

Overcurrent protection for a busway used as a branch circuit shall be provided in accordance with which NEC section?

What marking is required for power distribution blocks installed on the line side of the service equipment in a metal wireway?

For Class III, Division 1 locations, what must all boxes and fittings be?

The portion of an overhead crane or hoist that contacts an energized electrolytic cell must be insulated from what?

Which two occupancy types listed in Table 220.42(A) require the highest minimum unit load for general lighting calculation (VA/ft²)?

Cord sets or devices incorporating listed GFCI protection for personnel identified for portable use are permitted for generators manufactured or remanufactured prior to what date?

Switchboards, switchgear, and panelboards must have a short-circuit current rating not less than what value?

The minimum load used for calculating an individual household electric clothes dryer in a dwelling unit shall be the nameplate rating or what minimum wattage, whichever is larger?

Heating panel sets shall not be cut through or nailed through any point closer than what distance to the element?

Where the voltage between conductors that enter a building exceeds 35,000 volts, the conductors shall terminate in a switchgear compartment or what other location?

Overload protection is not required where a power loss would cause a hazard, such as in the case of what equipment?

What is the general requirement for all electrical equipment covered by Article 680 and used for a swimming pool installation?

Based on Table 400.4, what is the maximum standard voltage rating for Type EVJT electric vehicle cable?

How many 20-ampere small-appliance circuits are required for kitchens, pantries, dining rooms, and breakfast rooms in a mobile home?

What information must the flexible insulated bus itself be marked with along the insulation?

Nonmetallic raceways must be resistant to moisture and chemical atmospheres, flame retardant, resistant to impact and crushing, resistant to heat distortion, and resistant to what other condition?

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

For bonding requirements of a swimming pool, the perimeter surface is considered to extend up to what maximum vertical height above the maximum water level?

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

All ventilation openings to the indoors must be provided with automatic closing fire dampers that possess what minimum standard fire rating?

Extra-hard usage portable power cables containing an insulated equipment grounding conductor are permitted as permanent wiring on the underside of which structure associated with bodies of water?

Boilers operating over 1000 Volts must be supplied only from what type of electrical supply system?

Cabinets and cutout boxes must be deep enough to allow the closing of the doors when 30-ampere branch-circuit panelboard switches are in what position?

For indoor electrical equipment, which enclosure type provides protection against falling dirt, falling liquids, and settling airborne dust but NOT against circulating dust or hosedown?

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 wire-type equipment grounding conductor required for installation in a marina must be insulated and sized in accordance with 250.122, but not smaller than which size?

The ballast of a fluorescent luminaire installed indoors must have what specific feature?

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

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 Type AC cable is installed in a cable tray, how is the ampacity determined?

A permanent sign must be attached to the dedicated cable tray for welding cables at intervals not greater than 6.0 m (20 ft) and must include what wording?

Which component used in a Critical Operations Power Systems (COPS) installation is explicitly prohibited from being reconditioned?

Where are power distribution blocks permitted for connections of conductors in pull and junction boxes?

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 arc and xenon projectors of the professional type, conductors supplying outlets shall not be smaller than what minimum AWG size?

Horizontal runs of LFMC supported by openings through framing members shall be permitted if the support intervals do not exceed what maximum distance?

Systems qualifying under 220.82(C)(6) (electric thermal storage and other continuous heating systems) shall be calculated at what percentage of the full nameplate value?

For the purpose of determining the number of supplies to a building or other structure served by a feeder, a multiwire branch circuit shall be considered as what?

Each outlet installed for the purpose of supplying EVSE greater than 16 amperes or 120 volts shall be supplied by which type of circuit?

Capacitors that are part of X-ray equipment shall be mounted within grounded metal enclosures or what other type of enclosure?

Which operating characteristic is required for circuit breakers covered by Article 245?

All high-voltage parts of X-ray equipment, including X-ray tubes, must be mounted within what type of enclosure?

If primary-only protection is used for a transformer rated 1000 Volts or less with rated primary current of 9(amperes) or more, what is the maximum percentage rating permitted?

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

If flexible bus systems extend vertically through floors or platforms in wet locations, what is required to prevent waterflow through the opening?

A recessed luminaire that is not identified for contact with insulation (Non-Type IC) must have all recessed parts spaced not less than what distance from combustible materials?

Panelboards shall not be installed in which two physical orientations?

The duty rating for escalator and moving walk driving machine motors shall be rated as what duty cycle?

Thermal protection is not required for a recessed incandescent luminaire if it is identified for use and installed in what specific material?

When conductors or cables rated at a temperature higher than the listed temperature rating of LFNC are installed, what condition must be met regarding operation temperature?

Which conductors in a Solar PV system are required to comply with the rapid shutdown function requirements?

An insulated grounded conductor that is 4 AWG shall be identified by which of the following means?

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

What is the minimum bending radius permitted for portable power feeder cables rated 10,000Volts?

Where practicable, what practice shall be avoided in the IMC system to eliminate the possibility of galvanic action?

For fused cutouts used as the disconnecting means for outside conductors, simultaneous disconnection of all ungrounded supply conductors is not required if a permanent legible sign is installed adjacent to the cutouts reading what?

If the electrified truck parking space supply equipment provides heating, air-conditioning, and comfort-cooling without requiring a direct electrical connection at the truck, how many 20-ampere, 125-volt receptacles are required?

Using the formula for single-phase ac or dc ventilation in cubic meters per minute / m^3/min), what is the denominator used?

What is the maximum length permitted for feeder tap conductors if their ampacity is at least one-third that of the feeder conductors and they are suitably protected or enclosed in a raceway?

Switches and circuit breakers installed adjacent to motors, appliances, or other equipment that they supply are permitted to be located higher than 6ft 7in, provided they are accessible by what means?

Where Type AC cables are run across the top of framing members in accessible attics, protection by guard strips is required within what minimum distance of the scuttle hole if the space is NOT accessible by permanently installed stairs or ladders?

For ungrounded conductors in a wind electric system, the disconnecting means must consist of manually operable switches or circuit breakers and must meet which specific requirement regarding live parts?

Which items are explicitly prohibited from being used as connections for a separable power-supply cable assembly?

If multiple grounding connections result in objectionable current, and the effective ground-fault current path requirements are met, which remedial action is permitted?

Grounding is not required on an irrigation machine if the control voltage is 30 volts or less, the circuits are current limited by Chapter 9, Tables 11(A) and 11(B), and what other condition is met?

When heating cables are installed in concrete or poured masonry floors, what must be used to protect the leads where they leave the floor?

What is the minimum number of dwelling units required to use the optional multifamily dwelling calculation (220.84)?

If the commutator end of a motor-generator is enclosed by a wire screen or perforated metal, the maximum dimension of any opening in the screen or metal shall not exceed what size?

Working space about a battery system in an MDC shall be measured from the edges of the battery racks, cabinets, or what other component?

Which parts of Article 706 must flow battery Energy Storage Systems (ESS) also meet, in addition to Part V requirements?

Equipment that might produce arcs, sparks, or particles of hot metal, such as cutouts, switches, or motors, must be totally enclosed or constructed to prevent the escape of sparks/hot metal particles if located less than what minimum height above the floor level?

In walls constructed of wood or other combustible material, how must cabinets be installed relative to the finished surface?

To determine the rating or ampacity of the disconnecting means and branch-circuit conductors for a hermetic refrigerant motor-compressor, which current is generally used?

Using the formula for three-phase ac ventilation in cubic feet per minute / cfm), what number is used in the numerator, besides Volts and Amperes?

Which type of backfed circuit breaker is permitted to omit the additional fastener normally required by 408.36(D)?

Where a hoist operates over readily combustible material, the resistors are permitted to be located in a well-ventilated cabinet composed of what type of material?

A maximum of how many service disconnects shall be permitted for each service permitted by 230.2?

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

Each resistance welder shall have an overcurrent device rated or set at not more than what percentage of the rated primary current of the welder?

The listed Class 2 power supply or transformer primary shall be protected at not greater than what amperage?

In Class I, Division 2 locations, which of the following cable types are permitted, including installation in cable tray systems, provided they are terminated with listed fittings?

Where are conductor splices and taps permitted in messenger-supported wiring?

What material shall junction boxes be made of in cellular metal floor raceways?

When an emergency shutoff condition is reset, what is required?

Each length of RTRC shall be clearly and durably marked at least every what maximum distance?

Vegetation shall not be used for support of overhead spans of temporary branch circuits or feeders, except for which specific use case?

For a 3-phase ac motor, where devices other than fuses are used for overload protection, how many overload units are required, and where must they be located?

Pier power distribution systems shall not exceed what voltage phase to phase?

When PVC, RTRC, or HDPE conduit is used underground below classified locations, RMC or IMC conduit must be used for the last 2 ft. of the run to emergence, and what must also be included?

The ampacity of service conductors supplying a dwelling unit shall be permitted to be not less than what percentage of the service rating (100A through 400A)?

How must all joints between lengths of ENT, and between tubing and couplings, fittings, and boxes, be made?

Which wiring method is not listed as an approved method for electric motor-driven fire pump control wiring?

How must embedded cables, units, and panels be secured in place while the concrete, masonry, or asphalt finish is applied?

Industrial control panel enclosures shall not be used as junction boxes or raceways for conductors feeding through or tapping off to other equipment if the conductor fill exceeds what percentage of the cross-sectional area of the wiring space?

The output cable to the primary pad must be secured in place over its entire length for the purpose of restricting its movement and preventing what?

What maximum ampere rating is permitted for Emergency System lighting loads supplied by branch circuits that are transferred using a listed branch circuit emergency lighting transfer switch?

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?

If the voltage between overhead service conductors does not exceed 300, and no more than 1.8 m (6 ft) of conductors pass above the roof overhang (1.2 m horizontally), what is the minimum permitted vertical clearance above the overhang?

Where multiple switch locations control the same lighting load, the grounded conductor is only required at one location, provided which condition is met?

For lighting circuits in traveling cables, 20 AWG copper conductors or larger are permitted in parallel, provided the ampacity is equivalent to at least that of what minimum AWG copper size?

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

For a permanently connected appliance rated over 300text{ volt-amperes}, when is the branch-circuit switch or circuit breaker permitted to serve as the disconnecting means?

What is the minimum required ampacity for feeder conductors supplying a combination of continuous and noncontinuous loads, if the overcurrent protective device assembly is NOT listed for 100 percent operation?

The requirements regarding GFCI and AFCI protection for heating cables and cable sets installed in walls became effective on what date?

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

For pendants used in aircraft hangars (but not in Class I locations), the flexible cord must be suitable for the type of service and identified for what usage?

For an individual hermetic refrigerant motor-compressor, what is the maximum percentage of the motor-compressor rated-load current or branch-circuit selection current (whichever is greater) permitted for the branch-circuit short-circuit and ground-fault protective device rating?

According to Table 355.30(B), what is the maximum spacing permitted between supports for RTRC trade size 5?

Temporary electric power and lighting installations are permitted during which of the following periods?

For electrical equipment using type of protection “e” in Zone 1 locations, the available fault current must be limited to what maximum value unless listed for higher, to reduce the likelihood of ignition by an arc?

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?

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?

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

What is the minimum nominal discharge current rating (In) required for a surge-protective device (SPD) installed on a feeder supplying a dwelling unit?

Finished ceilings containing heating cables shall not be covered with decorative panels or beams constructed of materials that have what property?

If conductors or cables rated at a temperature higher than the listed temperature rating of PVC conduit are installed, what condition must be met regarding operation temperature?

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?

What is the ampacity for 4 AWG copper conductor, Type THW, installed in a raceway or earth (direct buried) under standard conditions (30°C ambient, 3 CCC)?

What is the minimum required airspace between any live metal part (including live metal parts of enclosed fuses) and the door of a cabinet or cutout box?

Field-installed terminals used for bonding and equipment grounding in damp or wet locations for a swimming pool must be composed of copper, copper alloy, or stainless steel and must be listed for what specific use?

When the Legally Required Standby source operates in parallel with the normal source, what criterion must be met regarding the required capacity?

In Zone 20 restricted industrial establishments, which cable type is permitted if it has a continuous corrugated metallic sheath, an overall jacket, and a separate equipment grounding conductor(s) in accordance with 250.122?

Electrified truck parking space equipment supplied from an overhead gantry must utilize what type of cable?

When single conductor cables comprising each phase, neutral, or grounded conductor of an AC circuit are connected in parallel, how must they be installed in auxiliary gutters?

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

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?

For circuits rated over 1000 V up to 22 kV, what is the minimum cover required for direct-buried cables (Column 1) in general conditions?

What is the required class of fit for metric-threaded fittings installed into explosionproof equipment?

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?

Are Medium-Power Network-Powered Broadband Communications Cables permitted in the same raceway, cable tray, box, or enclosure as Class 2 and Class 3 remote-control, signaling, and power-limited circuits?

When is Cablebus permitted to be installed outdoors?

The ampacity of Type AC cable must be determined in accordance with which NEC section?

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

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

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

Flexible cords used in Zone 20, Zone 21, and Zone 22 locations must be of a type listed for what specific usage?

Supplementary overcurrent protective devices for subdivided loads in resistance-type boilers must be accessible but need not be what other condition?

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

What specific parts of luminaires, portable luminaires, lampholders, and lamps shall have no live parts normally exposed to contact?

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?

Where metal-clad or nonmetallic-sheathed cables pass through 2 by 2 wood studs in a park trailer and are less than 32 (mm)/ 1 frac{1}{4}(in.) from the surface, they must be protected by steel plates or a steel tube with a wall thickness of not less than what minimum dimension?

What must be done with unused conductors in an enclosure within an elevator system?

Which type of LFNC is permitted as a listed manufactured prewired assembly in metric designator 16 through 27 (trade size 1/2 through 1)?

What is expressly prohibited from being used on conduit for connection at couplings?

Insulations marked for limited smoke after the type designation must also meet the requirements for what other characteristic?

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

Means shall be provided at which location to open the power circuit to all motors of the crane or monorail hoist?

For machines requiring electrical grounding, metal-to-metal contact with a part that is connected to the equipment grounding conductor and the non–current-carrying parts of the machine is considered what?

What is the minimum trade size (metric designator) permitted for RTRC?

Which flexible connection method, when used in Class III, Division 1 locations, requires bonding in accordance with 503.30(B)?

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?

Where shall an isolated ground receptacle not be installed?

Splices in concealed knob-and-tube wiring must be soldered unless what condition is met?

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?

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

What does the letter suffix “D” designate when used alone on a conductor type letter?

What specific exception allows the installation of appurtenant electrical equipment for the control of lights, curtains, and audio equipment within a projection room?

If electrical equipment enclosures on piers are not attached to mounting surfaces by means of external ears or lugs, what step must be taken regarding the internal screw heads?

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

For circuits rated over 1000 Volts, resistors and reactors shall be isolated by enclosure or elevation to protect personnel from accidental contact with what?

When Class I liquids are stored, handled, or dispensed, a Class I location shall not extend beyond what physical barrier?

The primary pad base plate for Wireless Power Transfer Equipment (WPTE) shall be made of what type of material?

In concrete or poured masonry installations, grounded metal-clad heating panels are permitted to be in contact with what component?

What is the minimum required duration (in hours) for the power source of an Emergency System to supply and maintain the total load?

All shields on portable cables rated over 600Volts up to 2000Volts shall be connected to what component?

Intrinsically safe apparatus, enclosures, and raceways, if of metal, shall be connected to what component?

What characteristic defines a Zone 20 location?

TRU spaces shall be supplied from 3-phase branch circuits of which voltages?

What is the minimum internal depth required for outlet boxes that do not enclose devices or utilization equipment?

What specific warning must be stated on the sign installed at the normal power source equipment if removing a grounding connection interrupts the grounding electrode connection to the alternate power source grounded conductor?

If a single section of lighting track is 4 ft. or shorter in length, how many supports must it have, unless identified for supports at greater intervals?

What must raceways, cable trays, cablebus, auxiliary gutters, and other ferrous metal equipment be protected against, inside and outside (except threads at joints)?

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

The 1 1/2 in. spacing requirement for luminaires under roof decking is not required where metal-corrugated sheet roof decking is covered with a minimum thickness of what material?

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?

When a Solar PV circuit conductor is connected at one end to a current-limited supply, but also connected to sources with an available maximum current greater than the conductor ampacity, where must the conductor be protected from overcurrent?

As viewed from the front of the industrial control panel, what is the required phase arrangement (A, B, C) on 3-phase horizontal common power and vertical buses?

When are nonmetallic wireways permitted to be used in wet locations?

What is noted as potentially causing nonmetallic wireways to become brittle and therefore more susceptible to damage from physical contact?

Motion picture projection rooms shall not be considered what type of location?

An isolating device that is part of listed equipment is permitted to serve as a Solar PV disconnecting means if an interlock or similar means prevents what action under load?

Flexible cords shall be examined and tested at the factory and must be marked with a label before what action?

Secondary conductors operating over 1000 volts shall be separated from each other and from all objects other than insulators or neon tubing by a spacing of not less than what distance?

When insulated conductors are deflected within a metal wireway and the direction of the metal wireway is deflected greater than 30 degrees, which table dimension applies?

If fixed industrial process heating equipment consists of motors over 1/8(hp) and other loads, what must the marking specify for the heating load?

Which current rating, in addition to the input/output current, must be marked on the nameplate of an Energy Storage System (ESS)?

For open containers of Class I liquids, what classification applies to the area extending 2 ft. beyond the Division 1 or Zone 1 classified location?

For heaters rated 50(kW) or more, the ampacity of field-wired conductors between the heater and the supplementary overcurrent protective devices is permitted to be sized at not less than 100 percent of the load of their respective subdivided circuits, provided what condition is met regarding conductor size?

In a 3-phase, 4-wire, delta-connected system used in an industrial control panel, which phase must be the phase having the higher voltage to ground?

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?

Is NUCC permitted to be installed inside buildings?

A loudspeaker installed in a fire resistance–rated wall must be listed and labeled, or identified as a speaker assembly for fire resistance, or installed in an enclosure or recess that maintains what?

Underground service conductors that are not encased in concrete and buried 450 mm (18 in.) or more below grade must have their location identified by a warning ribbon placed in the trench at least what minimum distance above the underground installation?

Motor controllers are permitted outside the designated machinery space if they are in enclosures with doors or removable panels that are capable of being locked in the closed position, and if the disconnecting means is located where?

What general rule applies to wiring methods for installing intrinsically safe apparatus?

For a screw shell device with attached leads, the conductor attached to the screw shell must have what color finish?

How must all surfaces, both interior and exterior, of auxiliary gutters be protected?

Where must decorative lighting and similar accessories be listed?

Equipment having an open-circuit voltage exceeding 300 Volts shall not be installed in dwelling occupancies unless designed so that there will be no exposed live parts during which three actions?

Which load must be calculated as the larger connected load for the purpose of applying the demand factors in Table 220.84(B) for multifamily dwellings?

Foot switches used to operate induction and dielectric heating equipment must be provided with what?

When using an individual power source to supply an electric motor-driven fire pump, the source must be capable of carrying indefinitely the sum of the locked-rotor current of the fire pump motor(s) and what two other loads?

If an appliance is supplied by more than one branch circuit or feeder, what must be provided for the disconnecting means?

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?

AFCI protection is not required where the extension of existing branch-circuit conductors does not include any additional outlets or devices, other than splicing devices, and the extension length is not more than what dimension?

What is the minimum unit load required for calculating lighting and general receptacle loads in a one-family dwelling?

When nonmetallic conduit (PVC or RTRC) or cable with a nonmetallic sheath is used underground, what must be included to provide electrical continuity and grounding of non–current-carrying metal parts?

Multimotor and combination-load equipment used in one- and two-family dwellings is not required to be marked with what rating?

The disconnecting means used to isolate each boat from its supply connection(s) shall consist of which of the following?

When flexible bus systems are subject to physical damage, what must be installed?

In restricted industrial establishments in Class II, Division 1 locations, Type MC-HL cable is permitted if it has a gas/vaportight continuous corrugated metallic sheath, an overall jacket, and what specific type of conductor(s) in accordance with 250.122?

During factory testing of a recreational vehicle’s electrical system, what is the required voltage and duration for the DC dielectric strength test (or its equivalent) between ungrounded and grounded conductors and the vehicle ground?

Portable stage lighting equipment not identified for outdoor use is permitted for temporary outdoor use if it is supervised by qualified personnel while energized and also what?

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

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

For permanent audio system installations, flexible cords and cables used for the electrical connection of equipment racks to the premises wiring system are permitted for the purpose of isolating what?

For an underground tank fill opening, what is the extent of the Division 2 / Zone 2 classified location above grade level, extending horizontally from any loose-fill connection?

For a 500 kcmil copper conductor (All Other Conductors) with five wires per terminal, what is the minimum required gutter width for deflection?

Germicidal irradiation luminaires shall not be installed as lighting for general illumination unless which condition is met?

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

In dwelling units, 125-volt through 250-volt receptacles supplied by single-phase branch circuits rated 150 volts or less to ground must have GFCI protection if installed within 1.8 m (6 ft) of the outside edge of which location?

Where multiple branch or feeder grounded circuit conductor load terminals are grouped together, they must be located so that it is not necessary to reach across uninsulated ungrounded bus, whether or not it is energized, in order to make connections. What is considered energized in this context?

Heating elements and assemblies shall not be installed where they bridge expansion joints unless what provision is made?

If a conductor with white insulation is reidentified to serve as an ungrounded conductor in a 240-volt circuit, the reidentification tape must encircle the insulation and must be applied where?

Insulated conductors or cables exposed to direct rays of the sun must be listed as being what?

What type of protection must cord-and-plug-connected portable, freestanding hydromassage units and hand-held hair dryers be constructed to provide?

The insulation of conductors intended for use in the secondary circuit of electric welders shall be what characteristic?

For platform lifts and stairway chairlifts, what is the maximum length permitted for flexible cords and cables that are components of listed equipment operating at 30 volts rms or less?

A plaque must be installed at or adjacent to the wind turbine location providing basic instructions for what?

What is the minimum kVA rating for which a transformer nameplate must provide the impedance?

What is the requirement regarding the interconnection components required for a complete heating equipment installation?

A feeder or service supplying household ranges and dryers is permitted to have an additional demand factor of what percentage applied to the maximum unbalanced load derived from those appliances?

A grounding autotransformer used to create a 3-phase, 4-wire system must be directly connected to the ungrounded phase conductors and shall not be switched or provided with overcurrent protection that is independent of what?

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

To ensure continuity of power and signaling, how must Vertical installations of CI cables and fire-resistive cable systems conductors be installed in a raceway?

Where an overcurrent device protects more than one set of parallel-connected PV string circuits, the ampacity of each conductor protected by the device must be not less than the sum of the device rating and what other current value?

What is the maximum amount of material permitted to be sprayed in a limited finishing workstation in any 8-hour period?

Which method is NOT listed for identifying the equipment grounding conductor layers of a concealable nonmetallic extension?

Under what condition are unbroken lengths (without coupling) of ENT permitted to be fished without securing in concealed work in finished buildings or prefinished wall panels?

Where must the transfer of power to the fire pump controller between the individual source and one alternate source take place?

Under what condition is FMC permitted to be used as an equipment grounding conductor?

Overcurrent protection for feeders and branch circuits supplying EVSE and WPTE shall be sized for continuous duty and shall have a current rating of not less than what percentage of the maximum load of the equipment?

For facilitating replacements in Class I, Division 2 locations, process control instruments are permitted to be connected through flexible cord and attachment plug and receptacle, provided the flexible cord does not exceed what maximum length?

The receptacle supplying a cord-and-plug-connected range hood or microwave oven/range hood combination must be supplied by what specific circuit configuration?

How frequently must LFNC be clearly and durably marked?

In a 100 mm (4 in.) wide ventilated channel cable tray, if only one multiconductor cable is installed, what is the maximum allowable fill area in square inches?

All lamps for general illumination installed inside of tents and concessions shall be protected from accidental breakage by a luminaire or lampholder with what?

In the case of nonmetallic sheathed cables entering through a raceway at the top of a surface-mounted enclosure (Exception No. 1), the cable sheath must extend into the enclosure beyond the fitting not less than what minimum distance?

What marking is required for receptacles rated 20(amperes) or less that are designed for the direct connection of aluminum conductors?

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?

Extra-hard usage cables used for TRU connections must have an outer jacket rated to be resistant to all of the following EXCEPT:

Under what condition is a maximum ESS DC voltage of 600 volts permitted in one- and two-family dwelling units?

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

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

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

The main overcurrent protective device that feeds the floating building shall have ground-fault protection not exceeding what current value?

What must be installed for locating cells in the future?

What specific marking is required for nonlocking-type, 125-volt, 15- and 20-ampere receptacles supplied from the Critical Operations Power Systems (COPS) when other power systems are present?

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

For a conduit passing completely through a Division 1 location without requiring a seal (Exception No. 1), what is the minimum distance required for the conduit run to be free of fittings on either side of the boundary?

Under what condition is the ampacity of the conductors from the generator output terminals permitted to be less than 115 percent of the nameplate current rating?

Each electrical appliance must be provided with a nameplate giving the identifying name and the rating in volts and amperes, or in what other rating unit?

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

When service-entrance conductors are installed in a cable tray, how must the cable tray be identified?

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

Which installation is NOT covered by this Code?

What is the minimum unit load required for general lighting calculations in a Fire station, in volt-amperes/ft²?

Transformer secondary conductors that are not over 3 m (10 ft) long are permitted without overcurrent protection at the secondary if their ampacity is not less than the combined calculated loads, and they do not extend beyond what devices or enclosures they supply?

In industrial establishments, working space less than that required by 110.26 or 110.34 is permitted with special permission, provided that conditions of maintenance and supervision ensure what?

Cablebus is permitted at any voltage or current for which the spaced conductors are rated, provided it is installed only for what type of work?

Alternating-Current General-Use Snap Switches rated for 347 Volts ac shall not be rated less than what ampere value?

If the open-circuit voltage of an over 1000Volts transformer is over 7500 Volts, what is the maximum secondary short-circuit current rating permitted?

Where equipment is operating at 1001 V to 2500 V, what minimum clear distance is required in the working space where there are exposed live parts on both sides (Condition 3)?

Where high-voltage secondary circuit conductors emerge from permitted wiring methods, they shall be enclosed in what component?

When electrical equipment is designed for use in the ambient temperature range between -20 (C) and +40 (C), what ambient temperature marking is required?

Where storage batteries are installed in a compartment in a park trailer, what minimum area of ventilation openings is required at both the top and at the bottom?

Seals complying with the requirements of 501.15 and 501.15(text{B})(2) shall be provided and shall apply to which boundaries of the defined Class I locations?

What is the maximum ampere rating permitted for branch circuits supplying two or more outlets for fixed electric space-heating equipment?

What must be provided where fire walls, floors, or ceilings are penetrated by IBP systems?

Gas detection equipment used as a protection technique must be listed for the detection of the specific gas or vapor encountered and listed for what specific zone?

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?

Are flexible bus systems permitted to be installed in hoistways?

Luminaires must be installed so that connections between the luminaire conductors and the circuit conductors can be inspected without requiring disconnection of any part of the wiring, unless the luminaires are connected by what means?

Electrical equipment that is an integral part of the MDC, such as ITE, lighting, control, power, HVAC, and alarm circuits, must comply with the requirements for its use and installation and must be what?

For the purpose of ampacity adjustment, the neutral conductor of feeders supplying solid-state, sine wave 3-phase, 4-wire dimming systems shall be considered what type of conductor?

What is the minimum required height for the unobstructed entrance or passageway accessing electrified truck parking space supply equipment?

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:

How must surface nonmetallic raceways and associated fittings be supported?

When conductors are run in parallel in accordance with 310.10(G), where shall the requirement to run all circuit conductors within the same enclosure apply?

Can a temperature controlled switching device that does not have an “off” position serve as the disconnecting means?

Under which condition is a single unbroken length of rigid or intermediate metal conduit permitted to support a box used for luminaire or lampholder support?

What wire bending space requirements apply at the terminals of power distribution blocks installed in a metal wireway?

PVC conduit is permitted to support nonmetallic conduit bodies, provided the conduit bodies are not larger than what size?

What is the minimum load, in volt-amperes/linear meter, that must be included for show-window lighting?

For pendants installed above hazardous (classified) locations, the flexible cord used must be suitable for the type of service and listed for what specific usage?

Control circuit conductors shall be considered as protected by overcurrent devices that are rated or set at not more than what percentage of the ampacity of the control conductors?

For one- and two-family dwelling units, where must an emergency shutdown device be located for fixed generators (other than cord-and-plug-connected portable generators)?

What continuous operational requirement must be met for a large-scale PV electric supply station?

What must the support brackets for flexible bus systems be secured to?

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

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?

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

When nonincendive field wiring systems (Type “ic”) are installed in multiconductor cables in Zone 2 locations, the conductors of each circuit must have insulation with what minimum thickness if not separated by a grounded metal shield?

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

Type TC-ER cable used for fixed wiring above hazardous locations must include what conductor in addition to any drain wire?

For a single household cooking appliance rated not over 12 kW, what is the maximum demand required in kW according to Column C of Table 220.55?

What is the maximum rating permitted for a single cord-and-plug-connected appliance on a circuit having no other outlets in a mobile home?

What is the requirement regarding electrical equipment used for electric arc welding, resistance welding, plasma cutting, and similar processes that are connected to an electrical supply system?

The secondary voltage of isolating transformers used in isolated power systems shall not exceed what voltage between conductors of each circuit?

Which grounding electrodes, if present at each building or structure served, must be bonded together to form the grounding electrode system?

When calculating additional loads for an existing dwelling unit without adding air-conditioning or electric space heating, what percentage applies to the first 8 kVA of load?

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

What must the “off” position of the initiation device for an ESS emergency shutdown function in a dwelling unit specifically perform?

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?

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?

Splices and taps in cables for stage set wiring are permitted if the total connected load does not exceed what limit?

A location where ignitible concentrations of flammable gases or vapors are likely to exist under normal operating conditions is classified as what zone?

To ensure continuity of power for a fire pump, the supply conductors must directly connect the power source to a listed fire pump controller, a listed combination fire pump controller and power transfer switch, or what other listed device?

Where the throw of a double-throw knife switch is vertical, what is required to hold the blades in the open position when set?

The continuous ampere rating of the switch or circuit breaker required by 610.32 shall not be less than 50 percent of the combined short-time ampere rating of the motors or less than what percentage of the sum of the short-time ampere rating of the motors required for any single motion?

What specific requirement applies to pipes or ducts foreign to the electrical installation in the vicinity of high-voltage service equipment or switchgear?

Where individual conductors pass through a metal cover, how must a separate hole for each conductor be provided?

Which characteristic is required for wiring methods used for installation in and adjacent to natural or artificially made bodies of water?

In spaces used for environmental air, electrical equipment having a nonmetallic enclosure must be listed for use within an air-handling space and have adequate fire-resistant and what other characteristic?

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?

A receptacle or switch with integral enclosure and mounting means is permitted to be installed in manufactured buildings if it is what?

According to Table 352.30(B), what is the maximum spacing permitted between supports for PVC conduit trade size 2 1/2?

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?

What demand factor percentage applies to the portion of non-dwelling receptacle load remainder over 10 kVA in Table 220.47?

According to Table 352.44(A), what is the expected length change of PVC conduit (in./100 ft) for a temperature change of 50°F?

An individual office furnishing of the freestanding type is permitted to be connected to the building electrical system by a single flexible cord and plug if it does not exceed what length when assembled with other electrically connected, mechanically contiguous units?

Under a raised floor of approved construction, which of the following is permitted to be installed if the area is accessible and openings minimize debris entrance?

Field-wired conductors between the heater and the supplementary overcurrent protective devices for subdivided loads shall be sized at not less than what percentage of the load served?

Conductors running to hoistway door interlocks from the hoistway riser must be flame retardant and suitable for a temperature of not less than what value?

Which components of a crane system are generally NOT considered electrically bonded through their metal-to-metal bearing surfaces?

The tests required for an AEGCP must be performed before the equipment is returned to service following which condition?

Open conductors must be supported on knobs, racks, brackets, or strain insulators made of glass, porcelain, or what other required material?

Boxes used to enclose flush devices or flush equipment must be designed to provide substantial support for the devices or equipment and ensure they are completely enclosed on what sides?

The conditions of maintenance and supervision for permanent amusement attractions must ensure that only what type of persons service the equipment?

The clearance requirements of 110.26(A) are not required if conditions of maintenance and supervision ensure that only qualified persons service the equipment and the live parts are suitably guarded, isolated, or insulated to reduce inadvertent contact with parts operating at voltages greater than which value?

Series ratings shall not be used where motor circuits are connected between the higher-rated overcurrent device and the lower-rated circuit breaker, and the sum of the motor full-load currents exceeds what percentage of the interrupting rating of the lower-rated circuit breaker?

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

Field bends or modifications must be made such that what two characteristics of the cable tray system are maintained?

What is the primary purpose of this Code?

Main contact conductors carried along runways shall be supported on insulating supports placed at intervals not exceeding what distance?

What must happen to the accessible portion of abandoned supply circuits and interconnecting cables?

For cord-and-plug-connected appliances, what is permitted to serve as the disconnecting means?

For what purpose are Fire-Resistive Cable Systems used in critical circuits?

Flexible cords and cables rated 105 (C), when used in ambient temperatures other than 30 (C) / 86 (F), must apply temperature correction factors from which column of Table 310.15(B)(1)(1)}?

What demand factor percentage applies when calculating the load for 4 units of commercial kitchen equipment using Table 220.56?

What must the entire RTRC conduit system, including boxes and fittings, be installed and equipped to prevent in wet locations?

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

In which occupancies is the separately derived 60/120-volt system permitted to be installed?

The WPTE control box is permitted to be mounted in all of the following forms EXCEPT:

For equipment installed in a Zone 20 or Zone 21 location, the operating temperature shall be based on operation of the equipment when blanketed with the maximum amount of dust (or with dust-simulating fibers/flyings) that can accumulate on the equipment, and the combustible dusts or combustible fibers/flyings shall be less than the lower of what two ignition temperatures?

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?

The selection of a power source for an electric motor-driven fire pump shall be performed by what type of device?

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

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

What is the maximum number of floors above grade a building can have for ENT to be generally permitted in both exposed and concealed work within walls, floors, and ceilings?

Uninterruptible Power Supply (UPS) systems installed within the information technology equipment room must comply with 645.10, except for power sources limited to how many volt-amperes or less derived from UPS equipment or integral battery circuits?

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?

Where is RTRC permitted to be used concerning severe corrosive influences?

If ampacity adjustment factors are waived for surface metal raceways (2500 mm² cross-section minimum and 20% fill maximum), what is the maximum number of current-carrying conductors permitted?

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?

Which component of a Microgrid System is responsible for coordinating the interaction between multiple power sources of similar or different types?

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

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?

The parts specified for equipotential bonding around a swimming pool shall be bonded together using solid copper conductors not smaller than what size?

What is the maximum load permitted on a single conductor portable feeder cable?

What is the maximum overall length permitted for a mobile home power-supply cord, measured from the end of the cord, including bared leads, to the face of the attachment plug cap?

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

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

What type of cable is permitted in restricted industrial establishments for applications limited to 600 Volts nominal or less, where not subject to physical damage, and terminated with fittings listed for Class I, Division 1 or Zone 1 locations?

All insulated low-voltage conductors in a park trailer shall be surface marked at intervals not greater than what maximum distance?

To locate electrical distribution equipment at the shoreline of a natural body of water, what minimum elevation above the electrical datum plane is required for the live parts of the equipment?

Where must electric motor-driven fire pump controllers and power transfer switches be located relative to the motors they control?

For busways over 1000 volts, how must the neutral bus, where required, be sized?

In panelboards, fuses of any type shall generally be installed on which side of any switches?

Conductors in open wiring on insulators within what distance from the floor are considered exposed to physical damage?

In addition to 210.8, ground-fault circuit-interrupter protection for personnel must be provided for cables installed in electrically heated floors of bathrooms, kitchens, and in what other specific location?

A surge arrester shall not be installed where its rating is less than the maximum continuous phase-to-ground voltage available at what point?

For a 3-wire, 2-phase system, the maximum unbalanced load is multiplied by what percentage?

What is the listed ampacity for 20 AWG Type E elevator cables, based on the footnote associated with Table 400.5(A)(1)?

What is the ampacity permitted for 4 AWG Type XLPE, EPDM 125(C) conductors used in a Solar PV system installation?

For Solar PV system DC circuits with a maximum voltage greater than 1000 volts installed on the exterior of buildings, the wiring methods connected to this equipment shall not attach to the building greater than what maximum length along the building surface from the equipment?

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?

Plug fuses of 15-ampere and lower rating must be identified by what specific configuration?

Working space shall be measured from the edge of which components?

What must suitable disconnecting switches or plug connectors be installed to permit the disconnection of?

When are identified handle ties permitted on multiwire temporary branch circuits?

Service conductors shall be connected to the service disconnecting means by what approved means?

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?

Only those conductors intended for termination in a vertical section of a switchboard or switchgear shall be located in that section, aside from what exceptions?

Which listed device is NOT considered a service disconnecting means, for the purpose of maximum number limitations?

Nonmetallic conduit containing a conductor operating at 100 Hz or less for neon secondary wiring over 1000 volts must be spaced not less than what distance from grounded or bonded parts?

Faceplates of insulating material shall be noncombustible and not less than what thickness, unless formed or reinforced?

When an electrical enclosure is part of an industrial wiring system (Part V) and operates under supervised conditions ensuring service by only qualified persons, how shall the design and installation be permitted?

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

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

Resistive heating elements in an electric swimming pool water heater shall be subdivided into loads not exceeding what amperage?

For a power feed bus rail with a circular cross section, what is the minimum required diameter?

If a portable power feeder cable is rated 15001 to 25,000 Volts and uses 4/0 AWG power conductors, what is the required equipment grounding conductor size (AWG) based on Table 400.44(B)(3)?

Means must be provided to simultaneously disconnect the heater, motor controller(s), and supplementary overcurrent protective device(s) of all fixed electric space-heating equipment from which conductors?

What specialized wiring method is permitted in Class III, Division 2 locations in sections, compartments, or areas that do not contain machinery and are used solely for storage, provided physical damage protection is provided?

Class I equipment must not have any exposed surface that operates at a temperature in excess of what specific material property?

Service-drop or overhead service conductors shall not be attached to a service mast between a weatherhead and a coupling, where the coupling is located above what?

If the motor controller for an elevator without generator field control is located in the hoistway, where must the main disconnecting means be located?

What is a permitted use for PVC conduit regarding concrete?

When PVC or RTRC conduit is used underground, RMC or IMC conduit must be used for not less than what minimum length of the conduit run to emergence?

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?

Where shall the lighting switch for the machine room, control room/machinery space, or control space be located?

If pendant conductors are longer than 3 ft. and not cabled in a listed assembly, what must be done to them?

What is the maximum percentage of the gutter area that the conductors, including splices and taps, shall not fill?

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 the minimum rating or setting required for the disconnecting means for a capacitor bank rated 1000 Volts, nominal, or less?

Meter sockets are generally NOT considered service equipment but must be listed and rated for what characteristics of the service?

Cabinets, cutout boxes, and meter socket enclosures shall be equipped with what?

What is the maximum length permitted for a flexible cord used as a transition between manufactured wiring system components and utilization equipment not permanently secured?

What mandatory sign wording must be installed immediately adjacent to fuseholders?

Where must the receptacle for a built-in dishwasher be located?

All unused openings in equipment provided with threaded entries shall be closed with blanking elements or close-up plugs that are listed for the location and will maintain what requirement?

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?

Contact conductors along runways, crane bridges, and monorails shall be permitted to be bare and may be made of which materials?

Where a phase converter supplies specific fixed loads and the conductor ampacity is less than 125 percent of the nameplate single-phase input full-load amperes, what is the minimum required ampacity for the conductors if the input and output voltages are identical?

Circuit breakers used to control oil-filled transformers in a vault shall either be located outside the transformer vault or be capable of what action?

Where are galvanized steel and stainless steel EMT permitted to be installed in corrosive environments?

The identification method utilized for ungrounded conductors originating within each feeder panelboard supplied from multiple nominal voltage systems must be documented in a manner that is readily available or must be what?

Which wiring method does NOT require steel plates to protect it when installed through bored holes in wood members where the 32 mm (1 1/4 in.) distance cannot be maintained?

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 track lighting is supplied through a device that limits the current to the track, how is the load permitted to be calculated?

Are reconditioned reactors permitted to be installed on electrical circuits?

To prevent the entrance of moisture, service-entrance conductors shall be connected to the service-drop conductors either below the level of the service head or below the level of what other component?

For devices mounted within a cabinet where the nominal voltage is 251 to 1000, what is the minimum required airspace between the walls, back, or door and the nearest exposed current-carrying part?

Nonheating leads installed in concrete, masonry, or asphalt must be provided with a grounding sheath or braid, or enclosed in specific metal raceways, except for which circumstance?

In a building or enclosed space located in a Class I, Division 2 location that is provided with a detection system (and does not contain a source of flammable materials), an alarm must be sounded at not more than what percentage of the lower flammable limit?

What is the minimum AWG size required for a contact wire if the distance between end strain insulators is 9.0 m (30 ft)?

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

Connections to busbar grid rails, cables, and conductors must be made with listed insulating devices and must be what after installation?

The two to six disconnects permitted by 225.33 shall be grouped, with the exception of one disconnect used only for which specific equipment?

Which of the following wiring methods is NOT generally permitted for conductors used in connection with cranes and hoists?

For cords having insulation on the individual conductors integral with the jacket, what difference in the individual conductor strands can serve as the grounded conductor identification per 400.22(E)}?

Solar PV conductors not greater than 3 m (10 ft) in length and in buildings are permitted to be protected from overcurrent on one end, provided they are contained in what type of wiring method?

For land areas not subject to tidal fluctuation, how high above the highest normal water level is the electrical datum plane set for determining equipment location limits?

For busways over 1000 volts, what must be accessible for installation, connection, and maintenance?

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

An individual overcurrent device for an autotransformer 1000Volts or less must be installed in series with which conductors?

Detachable panels not normally used for access to energized parts employing voltages exceeding 1000 volts ac or dc must be fastened in what manner?

Process-connected electrical equipment that incorporates a single process seal must be provided with an additional means to mitigate single process seal failure. If a drain or vent is used as the additional means, what maximum pressure is permitted to be exerted on the conduit or cable seal?

Short-circuit current rating markings are not required for industrial control panels containing only which components?

Panelboards equipped with snap switches rated at 30(amperes) or less shall have overcurrent protection of what maximum rating?

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

When calculating loads, calculations are permitted to be rounded to the nearest whole ampere, provided decimal fractions smaller than what value are dropped?

If Type MI, Type MC, or Type AC cable is used as permanent wiring, it must contain what conductor, sized in accordance with Table 250.122?

Where must a sign be placed indicating the type and location of each on-site Legally Required Standby Power Source?

When using actual maximum demand data for existing installations, the maximum demand at 125 percent plus the new load shall not exceed what requirement?

What must be coordinated to prevent damaging or dangerous temperatures in conductors or conductor insulation under short-circuit conditions?

Cabinets and cutout boxes that contain devices connected to more than how many conductors (excluding the supply circuit or a continuation thereof) must have back-wiring spaces, gutters, or wiring compartments?

When electrical equipment is being replaced in an existing building, Condition 2 working clearance is permitted between dead-front switchboards located across the aisle from each other, provided written procedures have been adopted to prohibit what action?

Which of the following is not a general wiring method permitted by 518.4(A), unless encased in concrete?

What is the maximum length permitted for FMT runs?

What specific requirement must the power source for circuits intended to provide power over communications cables to remote equipment in a Premises-Powered Broadband Communications System comply with, regarding interconnection?

Metric threaded fittings installed into explosionproof or flameproof equipment entries shall have a class of fit of at least what specification?

For a straight pull in boxes over 1000 volts containing nonshielded conductor or cable, the length of the box shall not be less than how many times the outside diameter of the largest conductor or cable?

The power unit for low-voltage fixed electric space-heating equipment must be an isolating type with a rated output not exceeding 25(amperes) and what maximum ac or dc voltage limits?

For fastened-in-place EVSE, where the personnel protection system interrupting device is within the supply equipment enclosure, what is the maximum length permitted for the power-supply cord?

The switch or circuit breaker controlling an over 1000Volts luminaire installation must be located within sight from the luminaires or lamps, or meet what alternative requirement?

For an outdoor remote pump, what is the extent of the Division 2 / Zone 2 classified location up to 18 in. above grade level?

Where a natural draft ventilation system prevents the accumulation of gases, what type of electrical equipment enclosure is permitted?

What must all junction box covers be clearly marked with in a 60/120-volt system installation?

A separable connector or a plug and receptacle combination in the supply line to a wall oven or cooking unit must be identified for what condition?

If a machine has a total connected resistance heating load of 50 A, a highest rated motor of 30 A, and other connected motors/apparatus totaling 40 A, what is the minimum required ampacity of the supply conductor if all loads may operate simultaneously?

If a recessed luminaire is installed in fire-resistant construction, and it is not listed for use in a fire resistance-rated construction, it must be installed in or used with what type of enclosure?

Thermal insulation shall not be installed above a recessed luminaire or within what minimum distance of the luminaire’s enclosure, unless the luminaire is identified as Type IC?

A conductor having no covering or electrical insulation whatsoever is defined as a/an:

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?

Receptacles and connectors used in manufactured wiring systems must be of which specific type?

Overhead lines for fire ladder zones in buildings exceeding 15 m (50 ft) in height must begin not over what maximum distance from the buildings?

A wind electric system must be listed or meet what alternative requirement for approval?

All shields on portable power feeder cables over 2000Volts shall be grounded at least at what location?

Circuit breakers protecting multiwire branch circuits that serve only single-phase line-to-neutral loads shall be permitted to use individual single-pole circuit breakers, provided they have what identified component?

For the purpose of calculating the maximum number of receptacles permitted in office furnishings (605.9(C)), how many receptacles are considered to be within one duplex receptacle?

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

When calculating farm loads for buildings other than the dwelling unit, what percentage applies to the Remainder of other loads?

If wiring for stage set lighting is subject to physical damage, what usage rating is required for the flexible cords and cables?

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

For a Vapor Processing System, if the equipment enclosure does not contain flammable vapor or liquid under normal operating conditions, what is the classification of the entire space within the enclosure?

What is the maximum operating voltage for low-voltage lighting systems using alternating current (ac)?

Conduits or raceways through which moisture might contact live parts shall be sealed or plugged at either or both ends. Which other type of raceway must also be sealed?

Flexible power cords and cables are permitted for connections between equipment enclosures of an MDC system provided they are not subject to what?

According to the general rule in Article 545, when shall service-entrance conductors be installed for manufactured buildings?

In other than dwelling units, single-phase 125-volt through 250-volt receptacles installed in locker rooms must be GFCI protected if the locker room includes what associated feature?

Where cable is used, each cable entering a cabinet, cutout box, or meter socket enclosure shall be what?

For transformers with ventilating openings, where must the required clearances be clearly marked?

For a switchboard or switchgear, where must the legible and permanent description for every circuit or circuit modification be located?

Which of the following specific appliances rated 150 volts or less to ground and 60 amperes or less requires GFCI protection for the branch circuit or outlet supplying it?

Equipment that has an open-circuit voltage exceeding 1000 Volts shall not be installed in which occupancy type?

What restriction applies to joints in vertical runs of metal wireways between supports?

Low-voltage lighting systems must be installed not less than what minimum horizontal distance from the nearest edge of the water of a pool, spa, fountain, or similar location, unless otherwise permitted?

In a Class I, Division 1 location, where two or more explosionproof enclosures requiring conduit seals are connected by nipples or conduit runs, what is the maximum length of the nipple or conduit run permitted for a single seal to be sufficient?

What is the minimum ampere rating required for switches used for lighting circuits in a recreational vehicle?

When is the machine required to be marked “overcurrent protection provided at machine supply terminals”?

What is the maximum interval permitted for securing Type AC cable?

Where a range, clothes dryer, or other appliance in a mobile home is connected by metal-covered cable or flexible metal conduit, what is the minimum length of unsupported cable or conduit required to service the appliance?

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

Messenger-supported wiring shall not be used in which two locations/conditions?

For alternating-current adjustable voltage motors, if the maximum operating current is not marked on the nameplate, the current rating determination for conductor ampacity and protection shall be based on what percentage of the values given in Tables 430.249 and 430.250?

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

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

Fastened-in-place EVSE is permitted to connect to premises wiring by a nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated 125 volts or 250 volts, single phase, up to what maximum ampere rating?

The short-circuit current rating of an industrial control panel must be based on one of two criteria: the rating of a listed and labeled assembly, or what other method?

When must electric power production equipment used in a Stand-Alone System be approved for use in island mode?

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

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

What is the maximum fill percentage permitted for conductors and cables in the cross-sectional area of the cell or header?

Time switches mounted so they are accessible only to qualified persons are permitted without barriers, provided any energized parts within what distance of the manual adjustment are covered by suitable barriers?

What is the minimum bending radius required for shielded or lead-covered conductors during or after installation?

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?

When establishing a new Legally Required Standby System, who is responsible for conducting or witnessing the commissioning of the complete installed system?

Replacement trip units must be listed for use with what component?

How frequently must NUCC be clearly and durably marked?

For tap conductors not over 3 m (10 ft) long, the ampacity of the tap conductors shall be not less than the rating of the equipment containing an overcurrent device(s) supplied by the tap conductors OR not less than the rating of what device?

Luminaires must be constructed, installed, or equipped with shades or guards so that combustible material is not subjected to temperatures in excess of what value?

When installed in lengths exceeding 1.8 m (6 ft), LFNC must be securely fastened within what maximum distance of every outlet box, junction box, cabinet, or fitting?

Which types of conductors are permitted to be assembled as a composite within the irrigation cable?

Conductors that are more finely stranded than Class B and Class C stranding shall use connectors and terminals that are identified for what?

Each grounded conductor must terminate within the panelboard in what type of terminal?

What must a circuit breaker have to show the open or closed position of the main contacts?

Which two criteria are used to determine if a section of switchboard or switchgear requires rear or side access to make field connections?

Which enclosure type is suitable for outdoor use and provides a degree of protection against incidental contact, rain, snow, and sleet, but NOT windblown dust?

In dry locations, conductors in open wiring on insulators enclosed in flexible nonmetallic tubing must be in continuous lengths not exceeding what distance?

In what type of location must the nonmetallic extension be run?

In which specific instance are terminals for grounded conductors permitted to be permanently identified at the time of installation by a distinctive white marking instead of having white or silver color?

The connection from high-voltage equipment to X-ray tubes and other high-voltage components must be made with what type of cable?

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 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?

Where an agricultural site is supplied by more than one distribution point, what permanent marking must be installed at each of these distribution points?

What is the maximum length permitted for the cord or cable from a busway plug-in device to a suitable tension take-up support device?

The splice connection between the nonheating lead and heating element within concrete, masonry, or asphalt shall be located no less than what minimum distance from the metal raceway?

A hand-operable circuit breaker equipped with a lever or handle is permitted to serve as a switch provided it has what feature?

What specific means must be provided to disconnect an Energy Storage System (ESS)?

What type of device is required in non-grid-interactive fuel cell systems that utilize utility grid backup?

For bonding requirements of a swimming pool, the perimeter surface is considered to extend for what horizontal distance beyond the inside walls of the pool?

The overcurrent protective device(s) for a feeder-supplied transformer must 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 percentage of the remaining loads supplied by the transformer?

Which component of a wind electric system shall not require a turbine output circuit disconnecting means if the turbine uses that circuit for regulating rotor speed?

Where shall the wind electric system disconnecting means be installed?

Which joining method is suggested for HDPE conduit in an informational note to 353.48?

A maximum of how many cord-connected showcases, other than fixed, are permitted to be coupled together by flexible cord and separable locking-type connectors?

If an Optional Standby System operates automatically and uses an Energy Management System (EMS) in accordance with 750.30, what capacity must the standby source have?

Overcurrent protection for an industrial control panel supply circuit must be provided by either a device located ahead of the panel or by what other device?

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?

If a disconnecting means is accessible to unqualified persons, what condition must the disconnecting means meet?

For a multispeed motor, the selection of branch-circuit conductors on the line side of the controller must be based on what rating?

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

When generator field control is used, the conductor ampacity shall be based on the nameplate current rating of which motor?

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

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?

Supplementary overcurrent protective devices for subdivided heating loads must be factory-installed within or on the heater enclosure or supplied for use as a separate assembly by the heater manufacturer, accessible, and suitable for what purpose?

The conductor used to connect the surge arrester to line, bus, or equipment and to the grounding connection shall not be any longer than necessary and shall avoid what?

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?

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

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

Monorail, tram rail, or crane runway tracks are permitted as a conductor for one phase of a 3-phase, ac system, provided the voltage does not exceed what value?

If a replacement snap switch (not connected to an EGC) is located within 5 ft. horizontally of ground or exposed grounded metal objects, what type of faceplate must be provided, unless the circuit is protected by a GFCI?

Where is NUCC generally prohibited from being used?

In tunnel installations over 1000 volts, how must electrical controls for the ventilation system be arranged?

A 12 AWG Type E elevator cable intended for 300Volts operation must have a minimum nominal insulation thickness of:

What must be provided on a phase converter for attachment of an equipment grounding conductor termination?

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

Where equipment grounding is required in a surface nonmetallic raceway, what must be installed?

In Class I, Division 2 locations, space heaters used to prevent condensation of moisture during shutdown must have an exposed surface temperature that does not exceed what maximum percentage of the autoignition temperature of the gas or vapor involved?

If the rated input current of an autotransformer 1000Volts or less is less than 9(amperes), what is the maximum percentage rating or setting permitted for the overcurrent device?

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

The number of conductors permitted in strut-type channel raceways is determined by the percentage fill using which table?

A one-family dwelling unit and its accessory structures are permitted to have how many sets of service-entrance conductors run to each from a single service lateral?

In completed installations, each box must have a cover, faceplate, lampholder, or luminaire canopy, and conduit body enclosures shall be installed with what?

Where multiple services or separately derived systems supply portable structures separated by less than 12 ft., the equipment grounding conductors of all sources shall be bonded together at what location?

The ampere rating of the disconnecting means for a resistance welder shall not be less than the supply conductor ampacity determined in accordance with what requirement?

For luminaires in fixed lighting in Class III, Divisions 1 and 2 locations, what is the maximum exposed surface temperature permitted under normal conditions of use?

When calculating the heating and air-conditioning load using the optional dwelling unit method, what percentage of the supplemental electric heating is added to the heat pump compressor rating for central systems?

For open containers of Class I liquids, how far horizontally must the floor-level (up to 460 (mm)[18text{ in.}] high) classified area extend beyond the outer 2 ft. boundary?

Which of the following is a required marking on all electrode-type boilers?

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?

The insulated copper equipment grounding conductor installed with the circuit conductors for swimming pool underwater luminaires shall be sized in accordance with 250.122 but shall not be smaller than what minimum size?

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?

All panelboards must have a rating not less than the minimum feeder capacity required for the load calculated in accordance with which part(s) of Article 220?

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

Where are conductors and cables required to be located in tunnels over 1000 volts?

Where the term “Class I” is used with respect to Zone classifications within Article 513, what Zone designations does it apply to?

If the controls for a remote-actuated disconnecting means are not located within sight of the battery, what is required for the disconnecting means?

If a prime mover-driven generator set requires more than 10 seconds to develop power for the Emergency System, what provision is required?

The maximum setting of the ground-fault protection system shall be 1200 amperes, and the maximum time delay shall be what value for ground-fault currents equal to or greater than 3000 amperes?

What is the ampacity permitted for 12 AWG Type PVC, CPE, XLPE 105(C) conductors used in a Solar PV system installation?

Under what condition is a conductor assembly in a Solar PV system permitted to be used at 100 percent of its rating instead of 125 percent?

What must nonmetallic auxiliary gutters installed indoors be listed for?

All appliances supplied by a voltage of 50 Volts or higher must have what qualification?

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

When 3-wire feeders utilize a common neutral conductor and are installed in a metal raceway, where must all conductors of all feeders be enclosed?

In Zone 2 locations, cables that do not have a gas/vaportight continuous sheath must be sealed at the boundary of the Zone 2 and unclassified location to minimize the passage of what material?

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

Single-throw knife switches shall be placed so that which external force will not tend to close them?

Switches and circuit breakers used as switches must be installed such that the center of the grip of the operating handle, when in its highest position, is not more than what height above the floor or working platform?

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

A disconnecting means serving a hermetic refrigerant motor-compressor must be selected on the basis of what minimum ampere rating?

If a single non-motor-operated appliance is rated over 13.3(amperes) and has no marked overcurrent protection rating, what is the maximum overcurrent protection rating permitted?

If two or more relocatable structures are structurally connected, and each has a factory-installed panelboard, how shall each panelboard be supplied?

Conductors of what size or larger installed in raceways shall be stranded, unless specifically permitted or required elsewhere in the Code to be solid?

Which of the following is NOT considered a splice or tap in cellular concrete floor raceways?

PVC conduit shall be fastened so that movement from what is permitted?

What is the minimum required melting point for the sealing compound used in seals for Class I, Division 1 and Division 2 locations?

Flexible bus systems must be terminated with what kind of fittings or connectors?

Flexible bus systems are permitted to be installed in support trays supplied as associated fittings, but what condition applies to these support trays?

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

If electrical equipment is deployed on remote locations, restricted public access must be provided in the form of physical barriers or what other measures?

For a circuit operating at 25 kV to ground, what is the minimum distance required between a fence enclosure and exposed live parts?

For a cord-and-plug-connected motor, an attachment plug and receptacle, flanged surface inlet and cord connector, or attachment plug and cord connector shall be permitted to serve as the disconnecting means if they have ratings not less than what rating?

High-voltage instrument or control transformers and space heaters are permitted to be installed in the high-voltage compartment without what restrictions?

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?

What minimum rated feeder assembly must be used for recreational vehicles wired with six or more circuits without a listed energy management system?

For a rectifier derived system, what nominal voltage is used to determine the voltage of the system?

For Power Source Output Conductors, what is the minimum required ampacity if calculated without adjustment or correction factors?

In one- and two-family dwellings, what is the maximum length permitted for the bonding conductor or grounding electrode conductor used for the non–current-carrying metallic members of an Optical Fiber Cable?

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

Where wires pass through an opening in an enclosure, conduit box, or barrier, what must be used if the opening has sharp edges?

For a separable power-supply cable assembly rated 30 amperes, 208Y/120 volts or 125/250 volts, how many conductors must the cord have for single-phase connection?

What construction must pull boxes for outdoor skin-effect heating installations be?

Which type of box is permitted to be used with stainless steel RMC when not subject to severe corrosive influences?

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

Where fuses are used for motor overload protection, where must a fuse be inserted in the supply system?

For Class 4 cables used in systems requiring Fault-Managed Power, what applications are explicitly prohibited unless the cable is listed for those other applications?

For equipment rated 1200 amperes or more and over 1.8 m (6 ft) wide, where shall an entrance and egress from the working space be provided?

The runway conductor disconnecting means for electrolytic cell lines is permitted to be placed out of view of the runway contact conductors when which condition is met?

If Type AC cable is installed parallel to the sides of rafters, studs, or ceiling or floor joists in accessible attics, what protection is NOT required?

Where an on-site standby generator is used to supply a fire pump, is an additional disconnecting means permitted between the generator and the controller?

Where must the disconnecting means for individual motors and controllers on an irrigation machine be located?

In Zone 20 locations, which types of conduit are permitted as wiring methods?

Where flexibility is required, listed flexible cord or cable, or listed festoon cable, shall be permitted to be used, and where necessary, what device(s) shall also be used?

If more than one emergency disconnecting means is provided for a dwelling unit, how shall they be installed?

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?

For Flywheel ESS (FESS) installations, what specific restriction applies regarding dwelling units?

To whom shall access be restricted for the electrical circuits and equipment related to Critical Operations Power Systems (COPS)?

Part VI of Article 425 applies to boilers employing what type of heating element?

If a luminaire is supported by a single conduit, what is the maximum weight permitted to be supported by the single conduit?

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

What is the maximum distance permitted between end strain insulators for a 2 AWG contact wire?

What is the minimum clearance required between bare current-carrying metal parts of different voltages mounted on the same surface in an auxiliary gutter?

If a resistance-type boiler not contained in an ASME-rated vessel is rated more than 48(amperes), the heating elements must be subdivided into loads not exceeding what maximum current?

All knife switches rated 600 to 1000 Volts and designed for use in breaking current over 200(amperes) must be provided with auxiliary contacts of what type?

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

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?

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?

If a replacement panelboard is not listed for the specific enclosure but the available fault current is 10,000(amperes) or less, what must be done to the replacement panelboard?

Busways shall not be installed in any hazardous (classified) location, unless what condition is met?

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 interconnection between paired wired luminaire sections, what is the maximum length permitted for metric designator 12 (trade size 3/8) flexible metal conduit?

What is required to protect Network-Powered Broadband Communications Cables attached to buildings or structures and located within 2.5 m (8 ft) of finished grade?

Which components must be durably and legibly marked with the manufacturer’s name or trademark?

Which factor is a principal determinant of a conductor’s operating temperature?

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

Listed receptacle faceplates with integral night light, USB charger, or both, that rely solely on spring-tensioned contacts, must be connected to only brass or copper alloy receptacle terminal screws and shall be rated no more than what wattage?

Where must the receptacle for an in-sink waste disposer cord-and-plug connection be located?

What demand factor percentage applies to the remainder of general lighting load over 120,000 VA in a Dwelling Unit?

For existing branch circuit installations without an EGC, the frame of an electric range or clothes dryer may be connected to the grounded conductor if the supply circuit is 120/240-volt, single-phase, 3-wire, or what other system?

A general-use or sign-specific retrofit kit for a sign or outline lighting system shall include installation instructions and what required listing status?

Which of the following is a permitted use for FMT?

In luminaires wired with screw shell lampholders, the grounded conductor, where connected to the screw shell, must be connected to which specific part of the lampholder?

When connecting two pieces of electrical equipment using flexible cable in a Class I, Division 2 location, what is required for the cable connectors on both ends if 501.141(text{B})(2)(A) is used?

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?

For a floating building, how many sets of service conductors are permitted to serve more than one set of service equipment?

A sump pump located in the elevator pit is permitted to be cord connected. What is the maximum length permitted for this hard usage oil-resistant cord?

A permanent, readily visible label indicating the highest maximum DC voltage in a PV system must be provided by the installer at which of the following locations?

Where equipment grounding is required, what must be installed in the nonmetallic wireway?

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

Where installed inside buildings, Solar PV system DC circuits that exceed 30 volts or 8 amperes must be contained in metal raceways, metal enclosures, or what specific type of cable?

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?

Which conductors are not required to be cabled?

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

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?

If a Primary Power Source and another Power Source are located at opposite ends of a busbar containing loads, the sum of 125 percent of the power-source output circuit current and the rating of the OCPD protecting the busbar shall not exceed what percentage of the busbar ampere rating?

Fittings and connectors intended to be concealed at the time of on-site assembly of manufactured building components must be permitted for on-site interconnection if they are what?

This Code covers installations used to export electric power from vehicles to premises wiring or for what other type of current flow?

Which conductors are NOT considered as current-carrying when calculating the fill and applying adjustment factors in nonmetallic wireways?

Where direct burial cables are shielded, what condition must be maintained across the splice or tap?

What is the maximum current rating for devices (other than polarized plugs/receptacles) that are required to have grounded conductor terminal identification?

If an industrial control panel is required to be marked with a short-circuit current rating, what two pieces of documentation must be made available to those authorized to inspect, install, or maintain the installation?

Conductors used in pipe organ systems must have which type of insulation?

Unless specifically permitted otherwise, what is the maximum overcurrent protection permitted for 16 AWG copper conductors, after correction factors are applied?

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

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

The connection between a large-scale PV electric supply station and the utility system must be through which method?

What is the minimum size of EMT generally permitted (metric designator)?

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

What types of contacts shall not be depended on for bonding purposes for metal raceways and enclosures in Zone locations?

For an installation to supply only limited loads of a single branch circuit, what is the minimum required rating of the branch circuit disconnecting means?

Edges of radiant heating panels and panel sets must be separated by not less than what minimum distance from the edges of any outlet boxes and junction boxes used for mounting surface luminaires?

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?

Open conductors shall be separated from open conductors of other circuits or systems by not less than what minimum distance?

Lampholders of the screw shell type shall be installed for use only as what?

For a circuit operating at 50 kV to ground, what is the minimum clear distance required between a fence enclosure and exposed live parts?

Motors rated less than 1/8 hp connected to a lighting circuit in a dwelling unit shall be considered part of what load?

In a supervised installation, feeder conductor sizing is permitted to be determined by qualified persons under whose direction?

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

Conductors used for neon secondary-circuit wiring over 1000 volts must be listed as gas tube sign and ignition cable type GTO and have a minimum temperature rating of what value?

The prime mover shutdown provisions must include equipping the generator with provisions to disable all prime mover start control circuits to render the prime mover incapable of what?

For electrode boiler designs other than those where fault currents do not pass through the pressure vessel, the pressure vessel containing the electrodes must be what?

What information must nonmetallic wireways be marked with that will be visible after installation?

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?

In installations within a surface of concrete, tile, gypsum, or other noncombustible material, what is the maximum distance the front edge of the box, plaster ring, extension ring, or listed extender can be set back from the finished surface?

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?

Where must the required surge-protective device (SPD) be installed?

A multi-pole switching device that serves as a disconnecting means for a fixed electric space-heating unit tapped from the ungrounded conductors of a grounded system must comply with which requirement?

Radiographic- and fluoroscopic-type industrial/commercial laboratory equipment must be effectively enclosed or provided with what to prevent ready access to live current-carrying parts?

Which cable wiring method is permitted in Class I, Division 2 locations for nonincendive field wiring applications?

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?

Where a feeder supplies a remote panelboard serving equipment on a fixed pier, an insulated equipment grounding conductor must extend from a grounding terminal in the service to which component in the remote panelboard?

Where is FMC permitted to be used?

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

What warning sign must mobile stanchions complying with 513.7(text{E}) carry?

Flexible bus systems shall have a short circuit current rating sufficient for what condition?

What is the maximum run length permitted for 18 AWG fixture wire when tapped to a 15-ampere or 20-ampere branch circuit?

Service conductors installed in conduit and under not less than 450 mm (18 in.) of earth beneath a building are considered to be where?

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?

Portable EVSE is permitted to connect to premises wiring by a nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated at 250 volts, single phase, and which maximum ampere rating?

A general requirement for office furnishings is that a wired partition shall not extend from what point to what point?

Under what condition is a listed molded case switch not required to have a horsepower rating when used as a main controller for an irrigation machine?

For fire-resistive cables and conductors, their support methods and spacing intervals shall comply with any restrictions provided in the listing of the system and shall not exceed what maximum values?

If a feeder supplies a continuous load of 40 amperes and a noncontinuous load of 20 amperes, and the overcurrent device assembly is listed for 100 percent operation, what is the minimum required ampacity for the feeder conductors?

What type of protection is required for the internal wiring of a recreational vehicle having only one 15- or 20-ampere branch circuit?

Which Class 2 cable type is permitted for use in environmental air spaces plenums?

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

Warning signs shall be posted to indicate the presence of what component in an electroplating installation?

If an industrial control panel is intended for use as service equipment, what is required regarding its type?

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?

A Zone 2 location is defined as an area where ignitible concentrations are not likely to occur in normal operation and, if they do occur, will exist only for how long?

How is prewired manufactured assembly ENT provided?

Type 1 essential electrical systems (EES) are comprised of three separate branches. What are these three branches?

Which item is explicitly exempted from complying with the support requirements of 590.4(J)?

Which of the following is not listed as a permitted fixed wiring method above hazardous (classified) locations in motor fuel dispensing facilities?

What is the accessibility requirement for the single overcurrent protective devices used to protect Solar PV system DC circuits?

If nonmetallic raceways are used as a general wiring method in assembly occupancies, they must be encased in not less than what minimum thickness of concrete?

What demand factor percentage applies when calculating the feeder load for 16 dwelling units in a multifamily dwelling using the optional method (Table 220.84(B))?

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

Which method is not listed as a way to supervise the fire pump disconnecting means in the closed position?

For CNG dispensing devices, what is the extent of the Class I, Division 2 classified area?

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?

Which table provides the expansion characteristics that are identical to those of PVC nonmetallic wireway?

What information must each section of a flexible bus system be marked with?

The power supply to a park trailer shall be a feeder assembly consisting of not more than one listed 30-ampere or 50-ampere power-supply cord, or what alternative?

In a limited finishing workstation, if industrial air heaters are used for drying, curing, or fusing operations, a high limit switch must automatically shut off the drying apparatus if the air temperature exceeds the maximum discharge-air temperature allowed by the heater listing or what maximum temperature?

Metal covers must be of the same material as the box or conduit body they are used with, or they must be lined with firmly attached insulating material not less than what minimum thickness?

What type of screws must be used for attaching a flush-type general-use snap switch to a box, if they are not the type provided with a listed device?

What is the maximum duration that temporary feeder conductors used to connect a generator for repair or emergencies are permitted to operate without ground-fault protection of equipment?

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

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)?

Under whose supervision must flexible bus systems be installed?

In agricultural buildings, cables installed using nonmetallic components shall be secured within what maximum distance of each cabinet, box, or fitting?

Installations under the exclusive control of an electric utility located on property owned or leased by the utility for the purpose of transformation are not covered by this Code. True or False?

The size of the DC system bonding jumper shall not be smaller than what conductor?

If reconditioned equipment is marked with the term “reconditioned” or equivalent, what must be done with the original listing mark?

When grounded neutral conductors of size 2 AWG and 1 AWG are installed in parallel for existing installations, what is required?

Cable trays are permitted to extend through walls/partitions or floors provided the installation, complete with installed cables, is made in accordance with which section?

Where interruption of the circuit would create a hazard (e.g., in a material-handling magnet circuit), conductor overload protection shall not be required, provided what type of protection is still provided?

Where multiple sources supply a single set of fuses, what must be placed at the fuses?

The protective device(s) shall be capable of detecting and interrupting all values of current that can occur at their location in excess of what?

How shall bends in NUCC be made?

Based on Table 400.44(B)(2), a 4 AWG power conductor requires a nominal insulation thickness of 150 mils when the cable is rated for which voltage range?

If an ESS operates in parallel with other AC sources, what specific characteristic must the inverters used possess?

Type 2 essential electrical systems (EES), generally used for nursing homes and limited care facilities, are comprised of which two separate branches?

For unbonded (floating neutral) portable generators / 15(kW) or smaller) with both 125 volt and 125/250 volt receptacle outlets, where must listed GFCI protection be provided?

If a resistance-type boiler is designed so that in normal operation there is no change in state of the heat transfer medium, it must be equipped with what specific device to limit maximum liquid temperature?

Besides the ESS output voltage, what required information must be legibly marked in the field on the ESS disconnecting means?

Which 3-phase system is required to be grounded if the neutral conductor is used as a circuit conductor?

Where high-voltage fuses are provided with an isolation switch, the switch must be of the load-interrupter type, unless what condition is met?

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?

Decorative lighting used for holiday lighting and similar purposes must meet which specific product requirement?

For the purposes of complying with 430.24, 430.53(B) and (C)}, and 430.62(A), the highest rated (largest) motor shall be considered the motor that has the highest what?

Which portable power feeder cable types are restricted to use only from 2000Volts to 5000Volts?

The ampacity of the supply conductor for an industrial control panel must not be less than 125 percent of the full-load current rating of all heating loads plus what other component of the calculation?

For a high-impedance grounded neutral ac system, the caution sign must indicate the voltage between conductors and the voltage to ground under fault conditions, which may persist for what duration?

A readily accessible disconnecting means must be provided to disconnect each heating equipment from its supply circuit. This disconnect must be located within sight from the controller or what other condition must be met?

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?

Splices are only permitted in portable cables rated over 600Volts up to 2000Volts if they are of which specific type?

What is the maximum inductive load rating, relative to the switch’s ampere rating, for an Alternating-Current or Direct-Current General-Use Snap Switch?

What type of wire connector system is required for conductor splices located above the waterline but below the electrical datum plane on floating structures serving a natural body of water?

For concealed work in finished buildings, what condition permits unbroken lengths (without coupling) of EMT to be fished without securing?

Cable tray systems shall not be limited to what type of facilities?

Thermal sensing devices used for overload protection on traverse functions shall be considered protected if the sensing device limits the travel in both directions during which condition of either motor?

Locations containing open tanks or vats of volatile flammable liquids are typically classified as what type of hazardous location?

Where open conductors cross ceiling joists and are exposed to physical damage, guard strips used for protection shall not be less than what nominal thickness?

When the frames and enclosures of portable electrical equipment used within the cell line working zone are permitted to be grounded, what physical protection must be provided?

What condition is required regarding the grounding of secondary circuits for low-voltage fixed electric space-heating equipment?

Fixed metal parts (like metal piping or metal fences) located no greater than what horizontal distance from the inside walls of a swimming pool must be bonded?

What is the maximum length permitted for the flexible cord connecting a range hood or microwave oven/range hood combination?

When a non-dwelling building complies with an energy code and the energy code unit value is used for lighting calculation, what continuous load multiplier must still be applied?

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

Means shall be provided to completely isolate an item of equipment from what components?

For an installation with a nominal voltage of 601 V to 1000 V between ungrounded conductors, what is the minimum elevation required for guarding live parts by elevation above the floor?

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

For nonincendive field wiring systems in Class III, Division 1 locations, simple apparatus not shown on the control drawing is permitted if it does not interconnect the nonincendive field wiring circuit to what?

What specific means must be provided for a Legally Required Standby System to confirm its operational status?

Where flammable gases or vapors are released within a cannabis oil booth, how is the space within the booth classified?

For the purpose of applying rapid shutdown requirements to a Solar PV installation, the array boundary is defined as what distance from the array in all directions?

What must corrosion protection maintain for the ferromagnetic envelope in skin-effect heating systems?

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

Electronic power converters intended for use in Solar PV systems must be listed or what alternative requirement must be met for the application?

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

If the circuitry supplying multiple motor-compressors is interlocked to prevent the starting and running of a second motor-compressor or group, how is the conductor size determined?

What is the maximum length of flexible metal conduit permitted in escalator wellways?

Alternatively, galvanized steel and stainless steel EMT shall be permitted to be installed in cinder fill where subject to permanent moisture when the tubing is installed at least how far under the fill?

Each electrode-type boiler designed so that 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?

Which type of device is explicitly permitted as a Solar PV system disconnecting means?

Where used at a point on a circuit, to which conductors must a surge arrester be connected?

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

Access doors to internal compartments containing equipment employing voltages exceeding 1000 volts ac or dc must be provided with a disconnecting means equipped with mechanical lockouts to prevent access while the equipment is energized, or what alternative measure must be taken?

The main disconnecting means must be legibly marked in the field with which information, in addition to the date of calculation?

Central heating equipment, other than fixed electric space-heating equipment, must be supplied by what type of branch circuit?

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?

After installation, receptacle faces must project a minimum of what distance from metal faceplates?

If CL3P cable is required, which substitution cable type, if available, is permitted in its place according to Table 600.33(A)(2)?

The bonding requirements contained in 250.97 shall apply only to solidly grounded Solar PV system circuits operating over what voltage to ground?

What is the minimum required distance from live parts to ground for a system rated not over 250 Volts, nominal?

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?

What must nonmetallic auxiliary gutters installed outdoors be marked with regarding temperature?

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

What must activate the damper operation of an HVAC system serving other occupancies that also serves the information technology equipment room?

The lighting outlets providing illumination for working spaces containing stationary standby batteries shall not be controlled by what means only?

For small motors not covered by Tables 430.247 through 430.250, what is the locked-rotor current assumed to be when calculating the combined load for the disconnecting means?

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?

What is the minimum required rating for overcurrent devices in interconnected Power Sources (other than generator systems)?

The conductors in portable power feeder cables over 2000Volts must be copper or larger than what size AWG?

For inspections and cleaning, the terminals of all cells or multicell units must be readily accessible, as well as one side of what?

If an ESS employs a diversion charge controller as the sole means of regulating charging, what essential safety feature must the system be equipped with?

Is PVC conduit permitted for the support of luminaires?

For low-voltage wiring in a park trailer, what metal component is permitted as the return path to the source of supply?

In other than horizontal runs, how shall cables be secured to the cable tray?

Electrical equipment enclosures installed on piers above deck level shall be securely and substantially supported by what means?

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

Where is LFNC prohibited from being used, due to exposure to high temperatures?

Where is the fuse or inverse time circuit breaker size marking permitted for an overload relay or other overload device used in equipment containing a motor-compressor?

Switchboards and switchgear that have exposed live parts must be located in permanently dry locations and accessible only to whom?

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

If placed in the projection room, the commutator end or ends of motor-generator sets must comply with several conditions, including being of which two specific types?

For the purpose of calculating the maximum number of receptacles permitted in office furnishings (605.9(C)), how many receptacles are considered to be provided within a single enclosure if there are up to two simplex receptacles within 0.3 m (1 ft) of each other?

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?

The collector ring assemblies on revolving-type machines (shovels, draglines, etc.) must be guarded to prevent accidental contact with energized parts by whom?

Overcurrent protection for a busway used as a feeder shall be provided in accordance with what?

Under an Assured Equipment Grounding Conductor Program (AEGCP), how often shall required tests be performed, at maximum?

In readily accessible locations, wind turbine output circuits that operate at voltages greater than 30 volts shall be installed in what specific wiring method?

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?

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?

Wiring from an Emergency System source must be kept entirely independent of all other wiring and equipment, except when located in which specific location?

Where motors are provided with terminal housings, the housings must generally be made of what material?

Metallic shielding components (tapes, wires, braids) must be connected to an equipment grounding conductor, an equipment grounding busbar, or what other component?

Emergency shutoff devices or electrical disconnects must disconnect power to all dispensing devices, remote pumps, associated power/control/signal circuits, and what other electrical equipment?

What must be provided to ensure that the fan circuit, where present, is energized when any heater circuit is energized in a duct heater system?

A ceiling-suspended (paddle) fan weighing not more than 3 kg (6 lb) is permitted to be supported on other boxes or plaster rings secured to other boxes, provided the fan or its supporting yoke is secured to the box with how many screws of what minimum size?

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?

Overcurrent protective devices that have been previously used and are installed in a temporary installation must be examined to ensure there is no evidence of what condition?

Power fuses of the vented type shall not be used in which location unless identified for the use?

A motor provided with a thermal protector complying with 430.32(text{A})(2) or (text{B})(2) must be marked with what phrase?

LFNC is permitted for direct burial only if what condition is met?

If the controls to activate the battery disconnecting means in an ESS are not located within sight of the battery, what is the required condition for the disconnecting means regarding security?

Battery chargers, their control equipment, and batteries being charged, shall not be located within what areas?

When an electrical installation is modified affecting the available fault current at the service, what action is required regarding the existing field marking?

When the mathrm{I}_{1eff} value is not given for an individual nonmotor-generator arc welder, what is the required multiplier for determining the minimum ampacity of the supply conductors if the duty cycle is 50 percent?

In wet locations, such as laundries, the entire PVC conduit system must be installed and equipped to prevent what?

Single-phase cord- and plug-connected room air conditioners must be provided with one of three factory-installed devices. Which of the following is not one of the listed devices?

A unit switch with a marked “off” position that is part of a fixed heater and disconnects all ungrounded conductors is permitted as the disconnecting means. What other component is permitted as the “other disconnecting means,” provided it is readily accessible for servicing?

What characteristics of zirconium, thorium, and uranium dusts necessitate safeguards beyond those required for typical Group E dusts?

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

If a thermal protector complying with 440.52(A)(2)} and (B)(2)} is used, what phrase must be marked on the motor-compressor nameplate or equipment nameplate?

If an industrial control panel is intended as service equipment, what marking is required?

What must be provided at low points in busway runs over 1000 volts to remove condensed moisture?

Listed electric-discharge luminaires complying with 410.62(C) are permitted to use conductors smaller than 12 AWG in the flexible cord assembly.

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

Heating cables installed under floor coverings shall not be installed where they bridge expansion joints unless what provision is made?

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

A unit switch with a marked-off position that is a part of an appliance and disconnects all ungrounded conductors is permitted as the disconnecting means, provided what other means for disconnection is present in multifamily dwellings?

Grounding for a single-section industrial control panel requires an equipment grounding conductor sized in accordance with 250.122 to be connected to which component?

The requirement for an isolating switch is waived where the disconnecting means is mounted on removable truck panels or switchgear units, provided all energized parts are automatically disconnected when the circuit breaker or switch is removed from where?

What is required for surface metal raceway and associated fittings?

The feeder or service neutral load shall be the maximum net calculated load between the neutral conductor and which other conductor?

If a floating building has multiple occupancy, how many sets of feeder conductors are permitted to supply each occupant?

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 individual lengths of horizontal metal wireways longer than 1.5 m (5 ft), where must they be supported?

What is the minimum vertical clearance required for overhead service conductors over residential property and driveways where the voltage exceeds 300 volts to ground?

Busbars in industrial control panels must be protected from physical damage and satisfy what other requirement?

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

What is the maximum ground-fault trip current permitted for the SPGFCI protection required for branch circuits supplying a swimming pool and operating at voltages above 150 volts to ground, not exceeding 480 volts phase-to-phase?

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

What must be provided where fire walls, floors, or ceilings are penetrated by busways over 1000 volts?

If grounded conductors of different nominal voltage systems are installed in the same raceway, cable, or box, how shall each grounded conductor be identified?

Pendant conductors used for intermediate or candelabra-base lampholders must not be smaller than what size AWG?

Where must a disconnecting means for the Class 2 supply be located?

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

How must exposed heating element assemblies be secured to the surface being heated?

The equipotential plane in an agricultural confinement area must encompass the area where the livestock stands while accessing what type of equipment that may become energized?

Which listed cable types are permitted in elevator hoistways and pits, provided they are supported and protected from physical damage?

For a building supplied by more than one service, a permanent plaque or directory must be installed at each service disconnect location denoting what?

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

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

Tap conductors supplying electric ranges from a branch circuit not exceeding 50 amperes must have an ampacity of not less than 20 amperes and shall not be longer than necessary for what purpose?

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

What temperature class (T Code) corresponds to a maximum surface temperature of less than or equal to 100 (C)?

When are expansion splice plates required for cable trays?

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?

For one-family and two-family dwellings with a wind electric system, where must a disconnecting means or manual shutdown button/switch be located?

For pendant luminaires in Class III locations, if the supporting stem is longer than 12 (in.) what must be provided?

Lampholders installed in damp locations must be listed for damp locations or listed for which other location type?

Overcurrent devices used in Solar PV source circuits shall be rated not less than what percentage of the maximum currents calculated in 690.8(A)?

Services used for temporary installations shall be installed in conformance with which parts of Article 230, as applicable?

Capacitors that are not an integral part of the rotary-phase conversion system but are installed for a motor load shall be connected where in relation to that motor’s overload protective device?

Conductors smaller than 8 AWG in open wiring on insulators must be rigidly supported at intervals not exceeding what maximum distance?

Service equipment shall not be installed in a location that is accessible to unqualified persons, unless the equipment meets what condition?

When a grounded conductor is reidentified for use as an ungrounded conductor in a single-pole switch loop, it shall be used only for which portion of the circuit?

If field-installed screws or fasteners are located within 10 mm (3/8 in.) of an enclosure wall, what is the maximum permitted extension into the enclosure?

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?

Is NUCC permitted to be installed in cinder fill?

A single entrance to and egress from the required working space for equipment over 1.8 m (6 ft) wide or deep is permitted if the location permits what type of way of egress travel?

Suspended ceiling power distribution systems shall not be installed as part of a fire-rated floor-ceiling or roof-ceiling assembly, unless what condition is met?

When operating portable and vehicle-mounted generators, exhaust must be vented away from structures and other areas where what might occur?

If all terminals of the wind electric system disconnecting means are capable of being energized in the open position, which required warning phrase must be mounted on or adjacent to the disconnect?

When lampholders have terminals that puncture the insulation, they shall be attached only to conductors of which type?

For floating piers installed to permit rise and fall response to water level, the electrical datum plane shall be a minimum of how far above the level of the deck?

Which of the following utilization equipment is NOT required to have an equipotential plane installed adjacent to it?

Class I, Group C atmospheres have a maximum experimental safe gap (MESG) value greater than 0.45 (mm)and less than or equal to what maximum size?

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

For fixed appliances on a circuit without lighting outlets in a mobile home, what is the maximum load permitted for motor loads or continuous loads?

What is the minimum thickness required for metal ventilating pipes used in Class III locations?

A listed leakage current measurement device shall be available and used where more than how many receptacles supply shore power to boats?

What is the maximum interval permitted for supporting individual conductors in a vertical run of Cablebus?

Where must permanent plaques, labels, or directories identifying Power Sources be installed?

The WPTE primary pad base plate is required to be connected to the circuit equipment grounding conductor unless the listed WPTE employs which alternative system?

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

Which provision shall not apply to the installation of a single conductor in a ferromagnetic envelope in skin-effect heating?

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

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?

What is the minimum required ampacity for feeder conductors supplying two or more X-ray branch circuits?

In addition to its control thermostat, all storage or instantaneous-type water heaters must be equipped with what to disconnect all ungrounded conductors?

When one or more pieces of EVSE equipment are provided with an integral load management control, what is required regarding marking?

Receptacles, attachment plugs, cord connectors, and flanged surface devices that have been reconditioned are permitted under which condition?

Handhole enclosure covers shall require the use of tools to open or they shall weigh over what minimum weight?

Which of the following is an approved means for supporting and securing Type AC cable?

What feature must a prime mover-driven generator set for a Legally Required Standby System include to avoid retransfer in case of short-time reestablishment of the normal source?

What type of coupling method is NOT permitted to be the sole means for bonding electrical continuity at service equipment, service raceways, and enclosures?

Direct-buried cables emerging from grade (Column 1 of Table 300.5(A)) must be protected by enclosures or raceways extending from the minimum cover distance below grade to a point at least what minimum height above finished grade?

For simple apparatus components with a surface area smaller than 10text{ cm}^{2} (excluding lead wires), they may be classified as T5 if their surface temperature does not exceed what maximum temperature?

Arrangement of direct-current ungrounded buses must be field marked as to polarity, grounding system, and what other characteristic?

Which of the following is NOT listed as a construction material for EMT?

Neon tubing shall be supported within what maximum distance from the electrode connection?

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?

Outlets for other than shore power, supplied by single-phase branch circuits, shall be provided with GFCI protection for personnel if they do not exceed 150 volts to ground and what maximum ampere rating?

What is the minimum ampere rating of the feeder assembly or service-entrance conductors that the manufacturer must provide in the written installation instructions for manufactured homes?

Is a wind electric system permitted to supply a building or other structure in addition to other sources of supply?

When the aircraft is stored in a hangar and whenever possible during maintenance, what must be done with the aircraft electrical systems?

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

If IBP is extended vertically through dry floors, what is required where it passes through the floor and for a minimum distance of 1.8 m (6 ft) above the floor?

When is it required to inspect factory-installed internal wiring or the construction of equipment that has been listed by a qualified electrical testing laboratory?

Each motor on a crane or hoist shall be provided with an individual controller unless otherwise permitted by which of the following exceptions?

If a metal panelboard cabinet is used with nonmetallic raceway or cable, what must be secured inside the cabinet?

When a remotely accessible adjustable-trip circuit breaker is connected through a networked interface, which condition must be met to use the adjusted current setting as the circuit breaker rating?

Which wiring method is NOT listed as being permitted to support a conduit body of any size, including a conduit body constructed with only one conduit entry, provided the trade size of the conduit body is not larger than the largest trade size of the conduit or tubing?

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?

Which Class I group classification is assigned to atmospheres containing Acetylene?

Which device is explicitly prohibited from being used as the emergency electrical disconnect handle?

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?

In a park trailer panelboard, the grounded circuit conductor terminals shall be insulated from what components?

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

If a resistance heating element is not in direct contact with the pipeline or vessel being heated, means must be provided to prevent overtemperature of the heating element unless what design condition applies?

What is the minimum vertical clearance required for overhead service conductors above the tracks of railroads?

Which type of equipment shall NOT be reconditioned?

Gas detection equipment used as a protection technique must be listed for the detection of the specific gas or vapor to be encountered and listed for what specific Class and Division?

Type PAF fixture wire is restricted for use only with which conductor material?

An overhead span of open conductors operating at 240 volts to ground over a residential driveway must have a minimum clearance of what dimension?

When a nonmetallic wireway is used as a pull box for insulated conductors 4 AWG or larger, what distance must be maintained for angle pulls?

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?

In Class III locations, which type of contact shall not be depended on for bonding purposes for metal raceways, fittings, boxes, cable trays, and enclosures?

Branches from busways are permitted to be made using which wiring method?

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?