2023 Commercial Electrical Inspector – Flashcards

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?

How must the messenger be grounded?

What voltage shall be considered when determining the required interrupting rating of equipment intended to interrupt current at fault levels?

A wind electric system using a diversion load controller to regulate rotor speed must be equipped with an additional, independent, reliable means to prevent what operational hazard?

What is the maximum interval permitted for securing a surface mount strut-type channel raceway?

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

Ampacities of conductors not shown in the tables but meeting general wiring requirements shall be permitted to be determined by interpolation based on what characteristic?

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

In one- and two-family dwellings, live parts in wind electric circuits over 150 volts to ground shall not be accessible to whom while energized?

Busways used in manufactured wiring systems shall be rated nominal 600 volts and which of the following ampere ratings?

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

What safety requirement must all luminaires, lampholders, and retrofit kits meet before installation?

Where a pipe heating cable outlet is installed in a park trailer, it must be located within what maximum distance of the cold water inlet?

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

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

The size of the DC system bonding jumper shall not be smaller than what conductor?

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

Means must be provided to ensure uniform airflow over the face of a duct heater in accordance with which instructions?

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

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

Which NEC section sets forth the demand factors permitted for each service and/or feeder circuit supplying receptacles that provide shore power for boats?

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

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?

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?

How must the capacity of the power supply to premises wiring systems fed by a Stand-Alone System relate to the load posed by the largest single utilization equipment connected?

The main disconnecting means for an irrigation machine must provide overcurrent protection, be readily accessible and lockable open in accordance with 110.25, and be located where?

Where a panelboard is supplied through a transformer, the required overcurrent protection must generally be located on which side of the transformer?

In dormitory units, 120-volt, single-phase, 15-ampere branch circuits supplying outlets or devices installed in which location shall be protected by AFCI?

What type of switch or circuit breaker is permitted as a Source Disconnecting Means if it is power-operated or remote-controlled?

For temporary feeder installations, Type SE cable shall be permitted to be installed in a raceway under which specific condition?

What must corrosion protection maintain for the ferromagnetic envelope in skin-effect heating systems?

Low-voltage cables connecting to oil-filled units that are not completely sealed (such as transformers or condensers) must have insulation of what type?

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

What monitoring and control components must Flywheel ESS (FESS) be provided with to avoid catastrophic failure?

The supply to a portable stage switchboard must be by means of listed what type of cords or cables?

When is securing nonmetallic-sheathed cable to a single gang nonmetallic box (not larger than 57 mm × 100 mm) NOT required?

Where multiconductor extra-hard usage portable cords are used for portable stage equipment supply, and the ampacity adjustment factors of Table 520.44(C)(2)(2) are applied (for more than three current-carrying conductors), what must the load diversity be?

FMT shall not be used in which of the following locations?

If a multifamily dwelling has 15 clothes dryers, what demand factor percentage applies to the total connected dryer load?

For service equipment supplying a nursing home, a surge-protective device (SPD) is required only for which specific area?

Any utilization equipment capable of producing sparks or particles of hot metal that is located above or adjacent to either the spray area or the surrounding Division 2, Zone 2, or Zone 22 areas must be of what specific type?

For a 90°C rated conductor, what is the ambient temperature correction factor for an ambient temperature range of 41–45°C (105–113°F) when using Table 310.15(B)(1)(2)?

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

Conductors for foot, border, proscenium, or portable strip lights must have insulation suitable for the temperature, but not less than what minimum rating?

Class I locations are those in which what type of materials are or may be present in the air in quantities sufficient to produce explosive or ignitible mixtures?

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?

What must each Cablebus system include at each terminating end?

What type of coupling method is NOT permitted to be the sole means for bonding electrical continuity at service equipment, service raceways, and enclosures?

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

What is the maximum total number of disconnects permitted for a separately derived 6-phase “wye” system with 60 volts to ground?

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

How is the maximum circuit current calculated for an ESS inverter utilization output circuit?

Is flexible metal conduit (FMC) permitted to be reconditioned?

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

Cable assemblies and insulated conductors entering enclosures covered by Article 312 must be protected from what?

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

If a bushing is used where oils, grease, or other contaminants may be present, what requirement applies to the bushing material?

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

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

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?

If insulated, equipment grounding conductors of the wire type must have what continuous outer finish?

The required markings on a panelboard must be visible after installation without disturbing which component?

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?

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

Overcurrent protective devices for critical operations data system(s) must be selectively coordinated with all supply-side overcurrent protective devices, and this selection must be documented and made available to whom?

For Group IIIC combustible dusts or metal combustible fibers/flyings, which Zone 2 classification is explicitly not permitted?

In a major repair garage (Class I liquids/gaseous fuels), the area up to 18 in. above floor level of the room for the entire floor area is classified as what, except as noted below?

For a 3-wire, dc generator, the protective devices must be interlocked so that no one pole can be opened without simultaneously disconnecting what?

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

What protection is required for secondary control devices and wiring provided as part of the metal-enclosed bus run over 1000 volts from all primary circuit elements?

Exposed live parts of motors and motor controllers operating at 50 Volts or more between terminals must be guarded against accidental contact by enclosure or by location, such as by elevation how far above the floor?

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

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

For tank storage installations inside buildings, what classification applies to all equipment located below grade level?

What minimum clearance must be maintained between a concealed knob-and-tube conductor and the surface over which it passes?

Is RTRC permitted to be installed in cinder fill?

Which of the following required markings shall be attached to the outside of the industrial control panel enclosure?

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

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

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

Cartridge fuses in circuits of any voltage, and all fuses in circuits over 150 volts to ground, must be provided with what device on their supply side?

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?

In Class I, Division 2 locations, general-purpose enclosures are permitted for resistors and similar equipment if the equipment is without make-and-break or sliding contacts, and if the marked maximum operating temperature will not exceed what percentage of the autoignition temperature in degrees Celsius of the gas or vapor involved?

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

For an enclosed spray booth or room, when automated spray application equipment is used, the area outside the access doors shall be unclassified provided what interlock condition is met?

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

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

What is the maximum size conductor permitted in surface metal raceway?

What temperature rating is required to be marked on all IBP?

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

Industrial machinery shall be considered as an individual unit and must therefore be provided with what?

For CNG dispensing devices, what is the extent of the Class I, Division 2 classified area?

What is the minimum size of a round access opening in a manhole intended for personnel entry?

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

Where flammable gases or vapors are released within a cannabis oil booth, how is the space within the booth classified?

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

When the ampacity of supply conductors is determined by the nameplate rating for a group of machines, the ampacity shall be not less than the sum of the nameplate ratings for the largest group capable of simultaneous operation plus what percentage of the standby currents of the remaining machines?

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

For a multibuilding campus-style complex where normal sources are impractical, two or more feeders are permitted as more than one power source if such feeders are derived from what component?

Panelboards must be durably marked by the manufacturer with the voltage, the current rating, and the number of ac phases or dc buses for which they are designed, and what other piece of information?

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

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

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?

For a grounded system, if the substantial structure supporting service conductors over a roof is metal, it shall be bonded by means of a bonding jumper and listed connector to where?

If a monorail track is used as a circuit conductor for one phase of a 3-phase, ac system, the power for all phases must be obtained from what device?

Where up to four equipment grounding conductors enter a box, how is the volume allowance calculated for equipment grounding conductor fill?

What is the maximum current permitted for a 16 AWG Type SJTW multiconductor cord connected to utilization equipment so that only two conductors are current-carrying (Column B)?

When PVC or RTRC conduit is used underground in Zone 1 locations, how far must RMC or IMC conduit extend for the last portion of the underground run to emergence?

When the depth of the working space is doubled (twice that required by 110.26(A)(1)), what is permitted regarding the entrance to and egress from the working space?

Reconditioned panelboards are permitted for use under which condition?

What minimum marking requirement must be field-applied at the permanent connection point for a temporary generator serving an Emergency System?

Portable EVSE is permitted to connect to premises wiring by a nonlocking, 2-pole, 3-wire grounding-type receptacle outlet rated at 125 volts, single phase, and which maximum ampere rating?

For concealed work in finished buildings where securing IMC is impracticable, what condition must apply to the lengths of IMC that are permitted to be fished?

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?

Nonmetallic enclosures are permitted to be installed without the required airspace on which surfaces?

Branch-circuit wiring, other than 2-wire or multiwire branch circuits supplying power to luminaires connected together, shall not be passed through an outlet box that is an integral part of a luminaire unless the luminaire is identified for what?

What is the minimum required clearance for overhead spans of open conductors above the track rails of railroads?

What material is PVC conduit required to be made of?

If cables operating over 1000 volts are installed in the same tray as cables 1000 volts or less, the high voltage cables must either be Type MC or what must separate them?

For a Vapor Processing System, if the equipment enclosure contains flammable vapor or liquid under normal operating conditions, what is the classification of the entire space within the enclosure?

Lampholders for portable lighting equipment shall be of what type and shall not provide means for plug-in of attachment plugs?

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

If an alternating-current motor rated 1/2(hp) or more is marked, what must be included on the marking in addition to the horsepower rating?

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

When surface-type snap switches are mounted for open wiring on insulators, what is NOT required?

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

What is the minimum conductor size permitted for taps to individual motors on an irrigation machine circuit?

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

Where a busway extends vertically through a dry floor, what construction is required where passing through and for a minimum distance of 1.8 m (6 ft) above the floor?

What is the minimum conductor size permitted for electromagnetic valve supply and similar circuits in a pipe organ?

Pier power distribution systems, where qualified personnel service the equipment under engineering supervision, shall not exceed what maximum voltage phase to phase?

The individual power grid rails must be mechanically secured to what?

How shall the transformer secondary center tap of the 60/120-volt, 3-wire system be grounded?

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

What is the maximum voltage permitted between conductors supplying an autotransformer-type dimmer?

Is a listed metal wireway permitted to be used as an equipment grounding conductor?

Motor overload protection is generally intended to protect motors, motor-control apparatus, and motor branch-circuit conductors against excessive heating due to motor overloads and what other condition?

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

The Enclosed-Break protection technique shall be permitted for equipment in which location type?

Where listed hard usage (junior hard service) cords are used in breakout assemblies, what is the maximum length permitted for the longest cord in the assembly?

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

Connections, taps, or extensions made from paralleled conductors must connect to which conductors of the paralleled set?

Low-voltage fixed electric space-heating equipment shall be considered what type of load for branch-circuit purposes?

What is the minimum internal depth required for boxes that enclose devices or utilization equipment supplied by 8, 6, or 4 AWG conductors?

Armories and auditoriums are considered what type of occupancy for lighting load calculations?

What is the minimum rating required for a panelboard employing a 40-ampere supply cord in a mobile home?

Luminaires recessed in ceilings, floors, or walls shall not be used to access outlet, pull, or junction boxes unless what specific condition is met?

Article 500 does not cover equipment features that involve what type of potential sources of ignition?

The EVSE load shall be calculated at the nameplate rating of the equipment or what minimum wattage (volt-amperes), whichever is larger?

What metric designators and trade sizes are permitted for LFNC when used as a listed manufactured prewired assembly?

When flexible cords are used in Class I, Division 1 and Division 2 locations, what must they contain in addition to the conductors of the circuit?

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?

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

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

When sizing the supply conductors to industrial machinery, what percentage of the full-load current rating of the highest rated motor must be included?

Each factory-assembled heating unit must be legibly marked with the permanent identification symbol, catalog number, and ratings in volts and watts or in volts and amperes within what maximum distance of the termination end of all nonheating leads?

If a Flow Battery System experiences an electrolyte leak, what safety measure must be provided?

Insulated conductors and cables installed in raceways in wet locations above grade shall be either moisture-impervious metal-sheathed or of a type listed for what specific use?

Wires used as contact conductors shall be secured at the ends by means of which approved component?

For land areas not subject to tidal fluctuation in a recreational vehicle park, the electrical datum plane shall be a horizontal plane that is what distance above the normal high water level for the area occurring under normal circumstances?

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?

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

Factory-installed receptacle outlets that are part of a permanently installed electric baseboard heater shall not be connected to which circuits?

Where adjustment or other attendance is necessary during the operation of motors or motor controllers operating at over 50 Volts to ground and guarded only by location, what must be provided for the attendant?

What is the minimum wire-bending space required in an enclosure for a single 1/0 AWG wire per terminal, measured in a straight line from the end of the lug?

For angle or U pulls in boxes over 1000 volts, the distance between each cable entry and the opposite wall shall not be less than how many times the outside diameter, over sheath, of the largest cable or conductor?

What system condition shall be avoided where practicable when installing EMT to eliminate the possibility of galvanic action?

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

Except for the connection in the service equipment, the grounded circuit conductor (neutral) in a floating building must be insulated from which components?

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

What information related to current is required to be marked on all IBP?

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

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?

A surge-protective device (SPD) is required where a feeder supplies which type of occupancy?

For transformers rated over 1000 Volts with impedance more than 6 percent and not more than 10 percent , what is the maximum permissible primary fuse rating in any location?

For indoor pumps, bleeders, or withdrawal fittings, what is the extent of the Division 2 / Zone 2 classified area horizontally from any edge of such devices up to 3 ft. above floor or grade level?

The optional calculation for new restaurants (220.88) is permitted when the feeder serves what portion of the total load?

Flexible cord is permitted to connect appliances to facilitate their frequent interchange or to prevent the transmission of which two conditions?

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?

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

In Zone 2 locations, Type TC-ER cable is permitted, provided it includes what specific conductor(s) in addition to a drain wire that might be present?

In recreational vehicle parks, what is the minimum percentage of all recreational vehicle sites with electrical supply that shall be equipped with a 30-ampere, 125-volt weather-resistant receptacle?

In which hazardous location is FMC generally NOT permitted to be used?

Where it is impracticable to provide supports, conductors can be fished through hollow spaces provided each conductor is individually enclosed in what?

For dipping, coating, and printing processes, the space inside a dip tank, ink fountain, ink reservoir, or ink tank shall be classified as what?

What restriction applies to cable wiring methods regarding support?

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

For a branch circuit supplying continuous loads, the rating of the overcurrent device shall not be less than the noncontinuous load plus what percentage of the continuous load, unless the assembly is 100% rated?

Oil-insulated transformers installed indoors must generally be installed in a vault constructed as specified in which Part of Article 450?

What specific requirement must abandoned Optical Fiber Cables meet?

Where a feeder supplies guest rooms and guest suites of hotels and motels, what protection device is required to be installed?

What is the maximum capacity for a fixed storage-type water heater that is required to have an overcurrent device and conductors rated not less than 125 percent of the water heater’s ampere rating?

Masts used to support final spans of feeders or branch circuits must be installed in accordance with 225.17(A) and (B). True or False?

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

Fixed electric space-heating equipment subject to physical damage must be protected in what manner?

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)?

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?

The length limitation of 1.8 m (6 ft) for flexible metal conduit is NOT required between risers and which elevator devices?

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

When lampholders have terminals that puncture the insulation, they shall be attached only to conductors of which type?

The disconnecting means for a monorail hoist or hand-propelled crane bridge installation is permitted to be omitted if which condition is met?

Dry-type transformers installed indoors and rated 112.5(kVA) or less must have a minimum separation of what distance from combustible material, unless a fire-resistant, heat-insulated barrier is provided?

Which specific installation is covered by this Code?

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

Conductive parts bonded together to reduce voltage gradients in a designated area are defined as a/an:

For a part-winding connected motor, what is the minimum required ampacity percentage for the conductors between the controller and the motor?

Overcurrent protection for storage battery conductors shall be permitted to be installed as close as practicable to the storage battery terminals in which location(s)?

A junction box connected to a conduit that extends directly to a forming shell of a swimming pool luminaire must be provided with a number of grounding terminals that shall be no fewer than what quantity?

Where a portable optional standby source is used as a nonseparately derived system, what action must be taken regarding the equipment grounding conductor?

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?

If resistance-type heating elements in fixed industrial process heating equipment are rated more than 48(amperes), they must be subdivided, and each subdivided load shall not exceed what maximum current?

What is the minimum vertical distance above energized surfaces of electrolytic cell lines that defines the extent of the cell line working zone space envelope?

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

A motor controller must be marked with the manufacturer’s identification, voltage, phase, full-load and locked-rotor current (or horsepower) rating, and what other data?

The ampere rating of busbars in portable distribution or termination boxes shall be not less than the overcurrent device supplying what component?

Boxes that enclose devices or utilization equipment supplied by conductors larger than 4 AWG must be identified for what?

All receptacles installed in a wet location for electric vehicle charging shall have an enclosure that is weatherproof when what condition is met?

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

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

If an irrigation machine has a stationary point, a grounding electrode system in accordance with Article 250, Part III, must be connected to the machine at the stationary point for what purpose?

Which of the following is a permitted use for metal wireways?

What must the isolating means provide for capacitors rated over 1000 Volts?

Regarding electrical equipment behind panels designed to allow access, what practice is prohibited?

When installing metallic electrical equipment (rated 50V to 1000V) in locations where physical damage is likely, what strength requirement applies to the enclosures or guards?

Heating cables installed under floor coverings shall not be installed where they bridge expansion joints unless what provision is made?

Where supply conductors for a portable switchboard are 20 ft. or less in length, their ampacity shall be permitted to be reduced, provided the ampacity is at least what minimum fraction of the current rating of the supply overcurrent protective device?

Which marking is required on cartridge fuses (by printing on the barrel or by an attached label) only when it is other than 10,000 amperes?

Secondary circuits of current and potential instrument transformers shall be grounded if the primary windings are connected to circuits of what voltage or more to ground?

If a surface (other than a structural member or grade) does not provide rigid and secure support for a mounted enclosure, what must be provided?

Where shall the grounded conductor of each separately derived system be bonded to the metal water piping system?

What is a typical Class I, Group B material mentioned in the informational note?

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?

What system is permitted to limit current and loading on busbars and conductors supplied by the output of one or more interconnected electric Power Production Sources?

What type of provision must be made in the supply circuit for each arc welder that is not equipped with an integral disconnect?

What type of switch connections are explicitly prohibited for controlling Emergency Systems lighting circuits?

Which wiring method is explicitly listed as suitable for underground wiring located within 1.5 m (5 ft) horizontally from the inside wall of the swimming pool?

Where are exposed bare conductors and current-carrying parts of the low-voltage secondary circuit permitted?

Conductors that are 18 AWG copper shall be permitted for non-power-limited remote-control and signaling circuits if they supply loads that do not exceed the ampacities specified in 402.5 and are installed in which component?

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)?

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

Which of the following locations is explicitly not covered by Article 500?

What temperature class (T Code) corresponds to a maximum surface temperature of less than or equal to 100 (C)?

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

When may an Emergency System feeder supply both emergency and nonemergency loads from the same common bus using overcurrent protection?

When rigid metal conduit or intermediate metal conduit is terminated at an enclosure in a park trailer using a locknut and bushing connection, how many locknuts must be provided?

A Class II, Division 1 location is defined as a location where combustible dust is in the air under normal operating conditions in quantities sufficient to produce what?

What type of equipment must be connected to an equipment grounding conductor according to Article 520?

What is the minimum branch-circuit rating required for an appliance that is a continuous load, other than a motor-operated appliance, if the branch-circuit device and its assembly are not listed for continuous loading at 100 percent of its rating?

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?

The lighting switch for hoistway pit lighting shall be so located as to be readily accessible from what location?

Which protection technique is permitted for equipment in Zone 0, Zone 1, or Zone 2 locations?

For individual open conductors not exposed to the weather and operating at 1000 volts, what is the minimum required clearance from the surface?

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

The output circuit of induction and dielectric heating equipment shall be permitted to have what connection status regarding ground?

If a feeder supplies 55 household electric clothes dryers, what is the required demand factor according to Table 220.54?

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

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

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

For boxes larger than 1650 cm³ (100 in.³), how large must the access openings in the building surface be?

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

How is unpowered equipment and enclosures considered grounded in a CATV system if the equipment is powered by the coaxial cable?

For circuits rated over 100 amperes, equipment termination provisions shall be used only for conductors rated at least:

Which of the following is NOT listed as a construction material for RMC?

Fastened-in-place EVSE is permitted to connect to premises wiring by a nonlocking, 3-pole, 4-wire grounding-type receptacle outlet rated 125/250 volts, single phase, and which minimum ampere rating?

Which of the following utilization equipment is NOT required to have an equipotential plane installed adjacent to it?

How shall bends in ENT be permitted to be made?

What method is permitted for making connections between parts of an equipotential plane system near bodies of water, besides exothermic welding?

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

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

Working space is not required to comply with 646.19 about ITE where any live parts exposed during routine servicing operate at not greater than what DC voltage?

The neutral conductor of a 3-wire branch circuit supplying a household electric range rated 8 3/4 kW or more must have an ampacity of not less than what percentage of the branch-circuit rating, and shall not be smaller than 10 AWG?

When running conductors in parallel, what must be true about the insulation type of all paralleled conductors that comprise each ungrounded conductor, grounded conductor, neutral conductor, equipment grounding conductor, equipment bonding jumper, or supply-side bonding jumper?

Each smoothing iron and other cord-and-plug-connected electrically heated appliance intended to be applied to combustible material shall be equipped with what component?

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

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

Supplementary overcurrent protective devices required for resistance-type heating elements rated more than 48(amperes) must be factory-installed within or on the heater enclosure or provided as a separate assembly by the heater manufacturer, accessible, and what other characteristic?

What must be installed on or at the access door for compartments containing equipment employing voltages from 150 volts to 1000 volts ac or dc, which must remain in place with or without the lock installed?

When a fire pump is supplied by an on-site power production facility, how must the source facility be located and protected?

If a drain or vent is used as an additional means to mitigate a single process seal failure, what is the maximum pressure permitted to be exerted on the conduit or cable seal?

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

All heating elements that are replaceable in the field and are part of an electric heater must be legibly marked with the ratings in volts and watts or in what other rating unit?

ENT is permitted to be embedded in a concrete slab on grade provided it is placed on what?

Where corrosive conditions (such as wet dust or excessive moisture) are present in agricultural buildings, what properties must equipment enclosures, boxes, conduit bodies, and fittings have?

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

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

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?

Based on Table 800.154(b), is a General-Purpose Communications Raceway permitted for use in vertical runs (risers)?

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

What specific marking suffix must be surface marked on Fire-Resistive Cable Systems cables and conductors?

What specific warning must be marked on a Source Disconnecting Means if the line and load terminals are capable of being energized in the open position?

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

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

Manufactured wiring systems are generally permitted in which two location types?

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?

When are expansion fittings required for RTRC?

Who is responsible for selecting and documenting the selective coordination of Legally Required Standby System overcurrent protective devices (OCPDs)?

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?

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

If immediate automatic shutdown of a motor by a motor overload protective device would introduce additional hazard(s), what alternative is permitted for the motor overload sensing device(s)?

The branch circuits supplying the lighting and the receptacles in machine rooms, control rooms, machinery spaces, control spaces, or truss interiors shall be which type relative to each other?

A suitable marker must be installed at or near each end of each straight run of underfloor raceways to locate what component?

For portable EVSE, how is the cord-exposed usable length measured?

Which of the following is a prohibited use for busways?

Feeder and branch-circuit conductors that are installed on fixed piers must be provided with ground-fault protection not exceeding what current value?

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

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

Luminaires installed between 1.5 m (5 ft) and 3.0 m (10 ft) horizontally from the inside walls of a swimming pool must have GFCI protection unless what exception applies regarding mounting height?

What is the minimum exposed usable length for a power-supply cord if the point of entrance is at the side of the park trailer?

What is the maximum interval at which Type G portable power feeder cable must be durably marked on the surface with required information?

What is the maximum length permitted for flexible metal conduit used as a wiring method in an elevator hoistway or pit?

Which type of branch circuit is permitted to supply any volt-ampere or wattage rating of fixed industrial process heating equipment for which the branch circuit is rated?

A storage water heater with a capacity of 60(kW) or above that is identified as suitable for use with a supply water temperature of 82 (C) / 180 (F) or above is exempt from what requirement?

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

Where two or more motors are used together, or where one or more motors are used in combination with other loads, the rating of the disconnecting means shall be determined from the sum of all currents at the full-load condition and also at what other condition?

For copper-clad aluminum conductors, what is the minimum percentage of the cross-sectional area that the copper must form?

What is the maximum circuit voltage permitted for branch circuits and feeders supplying motor controllers, driving machine motors, and machine brakes?

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

What is the required background color for the label on a rapid shutdown switch for a Solar PV system?

Which of the following is NOT a permitted installation location for flexible bus systems?

Where passing through wood cross members in plastered partitions, conductors must be protected by noncombustible, nonabsorbent insulating tubes extending how far beyond the wood member?

Motor branch-circuit short-circuit and ground-fault protection and motor overload protection shall be permitted to be combined in a single protective device, provided the rating or setting of the device furnishes what specified protection?

Battery circuits exceeding 240 Volts dc nominal between conductors or to ground and subject to field servicing must have provisions to disconnect the series-connected strings into segments not exceeding what maximum voltage for maintenance by qualified persons?

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

Is increasing the size of the equipment grounding conductor to address voltage drop considerations required for Solar PV system circuits?

What is the minimum space required between the top of a switchboard or switchgear (other than totally enclosed) and any combustible ceiling?

What item must be permanently identified at the fire alarm control unit location for a Non–Power-Limited Fire Alarm (NPLFA) Circuit?

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

The turbine disconnecting means shall consist of not more than how many switches or circuit breakers?

In agricultural buildings where excessive dust could be present, equipment enclosures shall have no openings through which what substance could enter?

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

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 rating information must the system nameplate for flexible bus systems include?

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

Which mandatory information must be marked on all conductors and cables?

What specific type of transfer equipment is not permitted for use in an Emergency System?

On a 4-wire, 3-phase wye circuit where the major portion of the load consists of nonlinear loads, how shall the neutral conductor be counted?

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

In a major repair garage where lighter-than-air gaseous fueled vehicles (such as hydrogen or natural gas) are repaired or stored, the area within 18 in. of the ceiling is classified as what?

Neon secondary conductor(s) shall be supported not more than how far from the electrode connection to the tubing?

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

For service and feeders supplying electrified truck parking spaces, which Climatic Temperature Zone yields the highest minimum allowable demand factor?

In addition to current and voltage, what information must switches be marked with if they are horsepower rated?

Rigid type contact conductors along runways must be spaced apart sufficiently to give a clear electrical separation of conductors or adjacent collectors of not less than what distance?

Electrified truck parking space electrical wiring system demand factors are based upon which specific characteristic of the installation location?

An equipotential plane shall be installed adjacent to outdoor service equipment or disconnecting means that control equipment in or on water if the equipment is located within what distance of the body of water?

What is the maximum interval permitted for supporting RMC along a straight run, unless otherwise permitted by the table in 344.30(B)?

An attachment plug and receptacle or cord connector is permitted to serve as the disconnecting means for a single-phase room air conditioner rated 250 Volts or less if the manual controls on the air conditioner are readily accessible and located within what maximum distance of the floor?

If motor overload protection external to the appliance is required, what marking must be present on the appliance nameplate?

The maximum permitted length for the flexible power supply cord connecting freestanding office furnishings to the building electrical system is what distance?

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

Nonmetallic extensions are permitted to run in any direction from an existing outlet, but where are they specifically prohibited from being run?

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?

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

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?

For nonmetallic auxiliary gutters, the adjustment factors specified in 310.15(C)(1) are applicable up to what maximum fill percentage?

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

For branch circuits other than individual circuits, which of the following is NOT a recognized circuit rating?

What function must an SPD provide to show that it is operational?

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?

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?

For electrostatic hand-spraying equipment, the high-voltage circuits shall be designed so as not to produce a spark of sufficient intensity to ignite the most readily ignitible vapor–air mixtures encountered or result in what other hazard?

What must be done to the dead ends of metal wireways?

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

Cables with entirely nonmetallic sheaths entering the top of a surface-mounted enclosure through nonflexible raceways (Exception No. 1) must ensure the raceway length is not less than what minimum distance?

Outlets for heavy-duty lampholders shall be calculated at a minimum of how many volt-amperes?

In aircraft maintenance and storage hangars, the classified area around power plants or fuel tanks extends upward from the floor to what height?

Conductors on the load side of a GFCI for a swimming pool light circuit shall not occupy raceways containing other conductors unless those other conductors meet which requirement?

Three-wire, dc generators must be equipped with overcurrent devices, one in each armature lead, and connected so as to be actuated by what current?

Bushings shall be used in neon secondary-circuit wiring of 1000 volts or less to protect wires passing through an opening in which material?

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?

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?

Supports for conductors 8 AWG and larger installed across open spaces are permitted up to what maximum distance apart, provided spacers are used?

Where enclosures for switches or overcurrent devices contain power monitoring or energy management equipment, the total area of all conductors, splices, taps, and equipment at any cross section shall not exceed what maximum percentage of the cross-sectional area of that space?

Where must a listed expansion/deflection fitting or other approved means be used in a raceway?

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

All electrical components within electrical equipment, excluding wiring methods, and connections not intended for operation while submerged shall be located at least how far above the deck of a fixed or floating structure?

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 setting inserts, what two conditions must be met regarding chips, dirt, and tools?

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

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

Are Legally Required Standby sources permitted to be solely dependent on a municipal water supply for their cooling systems?

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

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

For Liquidtight Flexible Metal Conduit (LFMC) in Class III locations, when is an equipment bonding jumper not required?

Where a Power Source connects to distribution equipment with no specific listing for combining multiple sources, which formula is used to determine the required busbar ampere rating (General Rule)?

When nonmetallic-sheathed cables pass through holes in metal framing members, how must the cable be protected?

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?

In a multigrounded neutral system, at least one grounding electrode shall be installed and connected to the multigrounded neutral conductor every what maximum distance?

If overcurrent protection is furnished as part of the machine, the supply conductors shall be considered either as feeders or as what, as covered by 240.21?

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

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

The rapid shutdown function required for Solar PV systems installed on or in buildings is intended to reduce the shock hazard for whom?

According to 422.5(A)}, which appliance requires Class A protection for personnel?

Where is NUCC generally prohibited from being used?

Which generation system is permitted to be connected to premises wiring without a grounded conductor, provided the connected premises wiring or utility system includes one?

When IBP penetrates an exterior wall, how must the opening in the wall be sealed?

In no case shall the distance between supports for nonmetallic auxiliary gutters exceed what maximum distance?

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

For fixed multioutlet assemblies in commercial occupancies where appliances are unlikely to be used simultaneously, each 1.5 m (5 ft) or fraction thereof shall be considered as one outlet of not less than how many volt-amperes?

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

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

What is the minimum ampere rating that the branch-circuit short-circuit and ground-fault protective device shall not be required to be less than?

Which type of pipe or duct system is prohibited from entering or passing through a transformer vault?

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

What must Energy Storage Systems (ESS) markings or labels comply with regarding legibility and durability?

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

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?

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 type of switches are explicitly prohibited from being reconditioned?

Oil-filled cutouts shall have a fault closing rating not less than what type of fault current that can occur at the cutout location?

Intermediate Metal Conduit (IMC) is permitted to serve as what type of conductor?

Where a building with more than one occupancy has a single service, one set of service-entrance conductors is permitted for each service run to each occupancy or group of occupancies, provided the number of service disconnect locations for any given classification does not exceed what number?

Connections between cellular metal floor raceways and distribution centers shall be made by means of which wiring methods?

The equipment grounding conductor for the feeder conductors supplying a floating building, when 6 AWG or smaller, must have a continuous outer finish of which color(s)?

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?

Utilization equipment supplied by a rotary-phase converter must be controlled in such a manner that power to the equipment will be disconnected in the event of what?

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

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

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

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

Which nominal ac system voltage is NOT listed as acceptable to supply equipment covered by Article 626?

What is the minimum vertical clearance required for overhead service conductors over public streets?

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

Steel cable trays shall not be used as equipment grounding conductors for circuits with ground-fault protection above what current rating?

What listed device must be installed in or on the fire pump controller?

What specific type of transformer is not permitted to be used in the electrical system of a recreational vehicle?

The cell line working zone is not required to extend through or beyond which of the following structural components?

What is the required voltage and ampere rating for a 3-phase, 3-pole, 4-wire receptacle required for TRU supply?

What is the maximum interval permitted for securing and supporting sheet metal auxiliary gutters throughout their entire length?

What are two specific environments where metal wireways are NOT permitted?

Supplementary overcurrent protective devices used for internal circuits and components of equipment are NOT required to be:

Switches and circuit breakers used as disconnecting means must be of which specific type?

What type of protection must industrial machinery with safety circuits have?

Where must the disconnecting means for a transformer (other than Class 2 or Class 3) be located?

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

Multiconductor jacketed cables that are not in raceways in a Solar PV system must be secured within what maximum distance of mating connectors or entering enclosures?

For 250 Volts or less nominal voltage, what is the minimum spacing required between line terminals and other uninsulated metal parts where terminal housings enclose rigidly mounted motor terminals?

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

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

Where a 125/250-volt receptacle is used in mobile home service equipment, what warning must be marked on the service equipment adjacent to the receptacle outlet?

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?

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

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

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?

How must the header be installed relative to the cells?

For angle or U pulls, the distance between raceway entries enclosing the same conductor shall not be less than how many times the metric designator (trade size) of the larger raceway?

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?

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

In a multisection switchboard, disconnects for the grounded conductor are permitted to be in any section of the equipment, provided the section is marked to indicate what?

What is required for branch circuits and feeders in the 60/120-volt system to disconnect all ungrounded conductors?

The equipment grounding terminal buses of the normal and essential branch-circuit panelboards serving the same individual patient care vicinity must be connected together with an insulated continuous copper conductor not smaller than what size?

What is required for nonmetallic wireways and associated fittings?

Which conductors are permitted to be attached to a service mast?

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)?

When is Cablebus permitted to be installed outdoors?

Heating element assemblies must be secured to the surface being heated by means other than what component?

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 must the flanged inlet or other cord-and-plug-type connection for a portable generator rated 15 kW or less be located?

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

In multiconductor extra-hard usage cords and cables, neutral conductors shall be white without stripe or identified by a distinctive white marking. Equipment grounding conductors shall be green with or without yellow stripe or identified by what marking?

All temporary branch circuits shall originate in which of the following approved locations?

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

Which type of wiring method is permitted in Zone 2 locations, where metal conduit does not provide the corrosion resistance needed, provided the wiring method is marked with the suffix -XW?

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

What must be excluded from a spray area or any surrounding area classified as Division 2, Zone 2, or Zone 22?

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

In buildings above 23 m (75 ft) in height, if the Emergency System feeder circuit wiring is not installed in spaces fully protected by an automatic fire protection system, what minimum fire rating is required if protected by an electrical circuit protective system?

Which factor is NOT required for consideration when calculating the minimum volume of a box or conduit body?

What is HDPE conduit required to be composed of?

What is the minimum horsepower rating for a motor required to be marked with its rated horsepower?

What are the insulation materials typically associated with Column B in Table 310.4(2) for conductors over 2000V?

What type of conductors are specifically disallowed in raceways when related to abandoned outlets on loop wiring?

How is prewired manufactured assembly ENT provided?

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?

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

All exposed lamps in dressing or makeup areas that are less than 8 ft. from the floor shall be equipped with what specific protective device?

All receptacle outlets in 626.24 must be provided with which specific type of protection for personnel?

The marking for the emergency disconnecting means must have a red background and white text, and the letters shall be at least what minimum height?

For jacketed cords furnished with appliances, 400.22(C)} permits one conductor’s insulation to be colored light blue, provided the other conductors have insulation of a readily distinguishable color other than which colors?

Portable power feeder cables over 2000Volts are permitted for connection of portable equipment and machinery or for which other application?

What is the minimum number of receptacles required in each operating room in a Category 1 space, divided between at least two branch circuits?

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?

Forming shells used with nonmetallic conduit systems for wet-niche swimming pool luminaires must include provisions for terminating an 8 AWG copper conductor, unless they are part of what type of listed system?

In a dwelling unit, which 120-volt, single-phase circuit supplying outlets or devices is required to have AFCI protection?

In solidly grounded wye Emergency Systems of more than 150 volts to ground and circuits rated 1000 amperes or more, what is the maximum setting permitted for the sensor devices that signal a ground fault?

When an existing receptacle outlet is connected to an inlet via a flexible cord assembly as permitted in 400.10text{(A)(11)}, the wiring interconnecting the inlet to the single receptacle outlet must be what type of method?

To reduce sparking in electric cranes and hoists used over combustible fibers/flyings, what minimum number of separate surfaces of contact must be provided for each contact conductor?

For a school with a total connected load of 40 VA/m², what calculation applies to the amount of load over 33 VA/m²?

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

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

Lighting equipment used with office furnishings must be listed, labeled, and identified for use with office furnishings and must comply with which subsections of 605.6?

What specific requirement must be met for PVC conduit when used for underground installations?

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?

In Class I, Division 2 locations, switches, circuit breakers, and make-and-break contacts of pushbuttons, relays, alarm bells, and horns that interrupt current must have enclosures identified for Class I, Division 1 locations, unless they meet certain exceptions. Which of the following is not an exception listed for allowing general-purpose enclosures?

Mating connectors for Solar PV systems that are readily accessible and used in circuits operating at over 30 volts DC or 15 volts AC shall require what for opening?

The two to six service disconnecting means permitted are permitted to consist of service disconnects in switchgear, transfer switches, or metering centers, provided each disconnect is located where?

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?

What type of protection must be provided for fixed outdoor electric deicing and snow-melting equipment?

Switches shall not be installed within tub or shower spaces unless they are installed as part of which assembly?

A conductor(s) exposed to external heat or connected to resistors shall have a flame-resistant outer covering or be covered with flame-resistant tape in which configuration?

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

Equipment listed and marked for Zone 20, 21, or 22 locations shall be permitted in what Class II Division location?

For an individual resistance welder wired for a specific operation with a known and unchanged actual primary current, what is the required multiplier for determining the minimum supply conductor ampacity if the duty cycle is 15 percent?

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?

What characteristic of the switching means, including interlocks, is required to prevent inadvertent interconnection of power sources when using a portable or temporary source for an Emergency System?

What is the maximum length permitted for a luminaire tap that contains conductors smaller than 12 AWG?

For a multi-occupancy building with more than six service disconnect locations for any given supply classification, what must be clearly described using graphics or text on one or more plaques?

Overload protection for motor-compressors and equipment used on 15text{-} or 20(ampere), 120 volt , or 15(ampere), 208text{-} or 240 volt , single-phase branch circuits that are not cord- and attachment-plug-connected is permitted in accordance with 440.54. What must the short-circuit and ground-fault protective device protecting the branch circuit have?

What labeling is required for the remote emergency stop switch for generators?

The maximum number of disconnecting means for each supply permitted by 225.30 shall consist of not more than six switches or six circuit breakers grouped in any one location. Which disconnect is NOT considered a supply disconnecting means?

What must be the result of operating the readily accessible manual shutdown button or switch on a wind turbine?

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

Splices and taps are permitted in surface metal raceways with a removable cover, provided they do not fill the raceway more than what percentage of its area?

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

The feeder or service neutral load shall be the maximum net calculated load between the neutral conductor and which other conductor?

What must danger signs conspicuously posted at points of access to conductors in raceway systems and cable systems state?

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

What is the purpose of having all parallel conductor sets within the same group?

Underfloor raceways shall be laid so that a straight line from the center of one junction box to the center of the next junction box coincides with what?

Factory-wired multimotor and combination-load equipment must be marked with the minimum supply circuit conductor ampacity and what other rating?

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

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

What is the minimum required insulation rating for current-carrying conductors in Cablebus?

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

Electric heating equipment must be installed in such a manner as to be afforded protection from what type of damage?

When are expansion fittings required in auxiliary gutters?

Under what condition are unbroken lengths of RMC permitted to be fished for concealed work in finished buildings?

Ground-fault protection of equipment is not required on the feeder disconnect if GFPE is provided on the supply side of the feeder and on the load side of which piece of equipment supplying the feeder?

When must the installation of 4-pair communications cables carrying power for remote equipment in a Premises-Powered Broadband Communications System comply with 725.144?

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

The short-circuit current rating requirement for SPDs does NOT apply to which specific devices?

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

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?

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

What is the maximum permitted length of unsecured LFMC for tap connections to luminaires as permitted in 410.117(C)?

A neutral conductor that carries only the unbalanced current from other conductors of the same circuit shall generally be counted when applying the provisions of 310.15(C)(1). True or False?

For an arc welder with a 30 percent duty cycle, which type of welder requires a larger multiplier for determining minimum supply conductor ampacity?

For transformers rated over 1000 Volts with impedance not more than 6 percent , what is the maximum permissible primary circuit breaker setting in any location?

For the purpose of calculating voltage drop on branch circuits supplying receptacles for cord-connected equipment, what percentage of the branch-circuit rating shall the connected load be considered?

For a single Solar PV system requiring rapid shutdown, which device is not permitted to serve as an initiation device?

Open motors that have commutators or collector rings must be located or protected so that what cannot reach adjacent combustible material?

Cords that comply with the requirements for outdoor cords and are designated with the suffix “W” are suitable for use in wet locations and must also possess which characteristic?

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

In Class II, Division 1, locations, boxes and fittings used in Group E locations must be identified for what general location classification?

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

What must be done to all cut ends of ENT?

Each length of RMC shall be clearly and durably identified with the manufacturer’s identification at least every what maximum distance?

Refrigerant machinery rooms using ammonia shall be permitted to be classified as “unclassified” if equipped with adequate mechanical ventilation that operates continuously or is initiated by a detection system at a concentration not exceeding what parts per million (ppm)?

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

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

Where conductors are drawn, what must the surfaces of cellular metal floor raceways be like?

What is the maximum voltage permitted for a listed Class 4 power transmitter (source) output?

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

Heating cables identified only for ceiling use shall not be installed in walls, unless necessary for what specific condition?

What is prohibited from being stored in transformer vaults?

For interconnected Power Production Sources that operate in Island Mode, how is capacity calculated?

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

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?

Grounding of both electrical and nonelectrical parts in a floating building shall be achieved through connection to which component?

What is the minimum clearance required between the edges of radiant heating panels/sets and recessed luminaires and their trims, ventilating openings, and other such openings in room surfaces?

What is required if two power fuses are used in parallel to protect the same load?

The EGC installed with feeder taps shall not be required to be larger than which conductors?

Ungrounded portable electrical equipment used within the cell line working zone must be distinctively marked and must employ plugs and receptacles that prevent what two things?

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

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?

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?

From what type of existing outlet must a nonmetallic extension originate, concerning amperage?

For the alternative wiring methods to be permitted, the information technology equipment room must be separated from other occupancies by fire-resistant-rated walls, floors, and ceilings with what provision?

The sum of the cross-sectional area of the individual conductors in a metal or nonmetallic wireway shall not be more than what percentage of the interior cross-sectional area of the wireway?

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?

What must be done to all cut ends of LFNC?

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

An on-site standby generator serving a fire pump must have sufficient capacity to allow normal starting and running of the motor(s) while supplying what other required simultaneous load?

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 is the maximum current calculation method for Power Source Output where not elsewhere required, if the equipment is not controlled by an EMS?

How close must a surface mount strut-type channel raceway be secured to each outlet box, cabinet, junction box, or other channel raceway termination?

What type of construction is required for the female half of multipole branch-circuit cable connectors for flexible conductors?

Cleat-type lampholders are permitted to have exposed terminals only if located at least what minimum height above the floor?

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

A power transformer connected to a wind electric inverter output is permitted without overcurrent protection at the inverter if its current rating on that side is not less than what value?

When are the adjustment factors in 310.15(C)(1) applied to conductors in a metal wireway?

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

Fixture wires are generally prohibited from being used as which type of conductors?

If safety circuits for personnel protection in an industrial control panel are subject to damage from surge events, where must surge protection be installed?

What is the maximum percentage of the interior cross-sectional area that the sum of the cross-sectional areas of all contained conductors and cables shall not exceed in a nonmetallic wireway?

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?

What is the minimum spacing required between the bottom of an enclosure and noninsulated busbars, their supports, or other obstructions, where raceways enter from the bottom?

In other than a dwelling unit, what is the maximum ampere rating permitted for branch circuits supplying fixed infrared heating equipment?

When the wiring to motors is metal-enclosed cable or in metal raceways, the junction box used to house motor terminals must be permitted to be separated from the motor by not more than what maximum distance?

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

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

HDPE conduit is permitted to be installed above ground only if encased in not less than what minimum thickness of concrete?

What is the maximum interval permitted for supporting individual conductors in a horizontal run of Cablebus?

Reconditioned motors identified for use in hazardous (classified) locations must be listed as reconditioned if installed in what type of location?

When the service equipment in a one- or two-family dwelling unit is replaced, which requirement applies regarding emergency disconnects?

What is the maximum output voltage permitted for the secondary winding of the isolation transformer connected to the pipeline or vessel being heated, under general conditions?

If a fuse is used to protect a feeder or branch circuit, how many fuses must be connected in series with each ungrounded conductor?

What length of busway is permitted to be extended through dry walls?

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

Overcurrent protection provided by an assembly listed for fire pump service shall not open within what time frame when subjected to 600 percent of the full-load current of the fire pump motor(s)?

Luminaires designed for end-to-end connection to form a continuous assembly are permitted to contain the conductors of a 2-wire branch circuit or one multiwire branch circuit supplying the connected luminaires. How many additional 2-wire branch circuits are also permitted?

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?

What protection is required for a luminaire installed over a bathtub or in a shower stall in a mobile home?

If a metal lampholder is attached to a flexible cord, the inlet shall be equipped with an insulating bushing that, if threaded, is not smaller than what metric designator?

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

Flammable gas detection systems are permitted as a means of protection only in what specific type of establishment?

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

For other than one- and two-family dwelling units, generators with greater than 15(kW) rating must be provided with what type of switch?

When calculating the required converter rating for a combination electrical system in a park trailer, what percentage load factor must be applied to the second 20 amperes of 12-volt equipment load?

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

Where multiple sources supply a single set of fuses, what must be placed at the fuses?

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?

Fluorescent or LED luminaires that utilize double-ended lamps and contain ballast(s) or LED driver(s) that can be serviced in place, installed in indoor locations other than dwellings, must have what component?

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

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

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

If more than two Type AC cables (each containing two or more current-carrying conductors) are installed in contact with thermal insulation without maintaining spacing, how must the ampacity of each conductor be adjusted?

The disconnecting means for a motor must be located in sight from the motor location and what other location?

What characteristic defines a Zone 22 location?

What must nonmetallic auxiliary gutters installed outdoors be marked with regarding temperature?

What is the maximum nominal voltage rating required for electrical equipment connected line-to-line in a recreational vehicle rated for connection to a 120/240-volt nominal system?

Group IIA atmospheres contain materials like methane, propane, and gasoline and are equivalent to which Class I Group classification?

Elevator driving machines and motor controllers must be installed in a room or space set aside for that purpose unless otherwise permitted, and this room or space must be secured against what?

In land areas not subject to tidal fluctuation, the electrical datum plane shall be a horizontal plane located how far above the highest water level for the area occurring under normal circumstances?

Where nonmetallic conduit is used from the forming shell to a junction box in a swimming pool installation, what minimum size bonding jumper must be installed in the conduit?

What is the maximum voltage permitted between conductors for the primary circuits of isolating transformers supplying ungrounded receptacles in the cell line working zone?

Where must the instructions for the course of action to be taken in the event of an indicated ground fault be located for a Legally Required Standby System?

The total load on a branch circuit shall not exceed the rating of the branch circuit nor what other requirement?

What is the maximum overcurrent protection rating permitted for each circuit supplying household-type appliances with surface heating elements having a maximum demand of more than 60(amperes)?

Which component is not permitted to be included in auxiliary nonelectrical connections to an electrolytic cell?

What is the maximum permitted DC voltage for Solar PV system DC circuits located within or originating from arrays on or attached to buildings?

When one or more pieces of EVSE equipment are provided with an integral load management control, what is required regarding marking?

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?

Where must decorative lighting and similar accessories be listed?

If a temperature-controlled switching device indicates an “off” position and interrupts line current, it must open all ungrounded conductors when placed in this “off” position and shall not be permitted to serve as the disconnecting means unless what condition is met?

What marking must metal wireways have that will be visible after installation?

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

Circuit breakers and switches installed in gasketed enclosures shall be arranged to permit required manual operation without exposing what part of the enclosure?

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?

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

Where a service raceway enters a building or structure, it shall be sealed in accordance with 300.5(G) and which other section?

How shall bends in NUCC be made?

What is the maximum length permitted for FMT runs?

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

In Zone 2 locations, when is an equipment bonding jumper not required for Liquidtight Flexible Metal Conduit (LFMC)?

A motor controller (other than inverse time circuit breakers and molded case switches) must have a horsepower rating at the application voltage not lower than what rating?

Type TC-ER cable, Type PLTC-ER cable, or Type ITC-ER cable used for fixed wiring above hazardous locations shall include what conductor in addition to any drain wire?

When temporary flexible cords or cables identified for hard or extra-hard usage are installed in cable trays under conditions of supervision and maintenance by qualified persons, what labeling must be attached to the cable tray at intervals not exceeding 25 ft.?

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

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

If cartridge fuses are used to provide supplementary overcurrent protection for subdivided circuits in a resistance-type boiler, how many disconnecting means are permitted for the several subdivided circuits?

For a dispensing device (except overhead type), what Class I location applies to the entire space within and under the dispenser pit or containment?

A cable, raceway, or box installed under metal-corrugated sheet roof decking must be supported so there is not less than what minimum clearance measured from the lowest surface of the roof decking to the top of the installation?

If a combined switching device (controller/disconnect) is manually placed in the “off” position, what must its design ensure regarding the circuit?

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

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 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?

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

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

What is the minimum required interrupting rating for branch-circuit overcurrent protective devices?

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

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

Where a raceway enters from an underground system, the end within the building must be sealed with an identified compound to prevent the entrance of what?

Where two or more relocatable structures are structurally connected and use a common grounding electrode conductor arrangement, what conductor is permitted to be used as the tap conductor?

In outdoor swimming pool areas, luminaires installed above the pool or within 1.5 m (5 ft) horizontally must be installed at a height not less than what distance above the maximum water level of the pool?

What is the minimum required ampacity for PV circuit conductors if calculated without adjustment and correction factors?

For an indoor dispensing device with mechanical ventilation (except overhead type), what is the extent of the Division 2 / Zone 2 classified location?

If ferrous metal raceways are protected from corrosion solely by enamel, they shall NOT be used in which locations?

Which wiring method is explicitly permitted in Class I, Division 1 locations for optical fiber cables, provided they are installed in raceways in accordance with 501.10(A) and sealed in accordance with 501.15?

If an outlet box has a surface area of 1160(mm) squared / 180(in.) squared or more, and combustible wall or ceiling finish is exposed between the edge of the luminaire canopy and the box, what must be done?

For which motor component must the motor nameplate current ratings be used to determine the necessary values, regardless of motor type?

In Class I locations, bonding jumpers used for metal raceways, fittings, boxes, cable trays, and enclosures must have what type of fittings?

Effective January 1, 2026, what listed device is required to be permanently installed between the feeder assembly connection and the panelboard or transfer switch in each recreational vehicle?

What condition is required regarding the grounding of secondary circuits for low-voltage fixed electric space-heating equipment?

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

Electrical equipment with a metal enclosure is permitted to be installed in other spaces used for environmental air (plenums), provided what condition is met regarding associated wiring material?

What must be provided at low points in busway runs over 1000 volts to remove condensed moisture?

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

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

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

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?

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

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?

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

In bathrooms and shower spaces, metal parts of ceiling-suspended (paddle) fans shall not be located within a zone measured 3 ft. horizontally and 8 ft. vertically from where?

Listed Ground-Fault Protection of Equipment (GFPE) shall be provided for feeders installed on docking facilities (other than floating buildings) and rated not more than what current value?

What is the maximum system voltage permitted for FMT use in branch circuits?

When is a separate equipment grounding conductor NOT required in a nonmetallic wireway?

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

In footlights, regardless of the trough construction type, how must the circuit conductors be connected to the lampholder terminals?

What is the maximum distance permitted between the 100-mm (4-in.) curb and the floor opening for riser busways in non-industrial establishments?

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

How is the maximum current calculated for a Solar PV DC-to-DC converter circuit?

Which type of SPD is permitted to be installed anywhere on the load side of the service disconnect to provide overvoltage protection for a wind electric system?

Which of the following is required to be included in a Cablebus system?

If a motor(s) of more than 1/8(hp) and the heater are provided with a single unit switch complying with 422.34(A)}, (B), (C), or (D), the disconnecting means shall be permitted to be located where?

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

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

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

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

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

What specific properties must HDPE conduit material possess to withstand handling and installation abuse?

All receptacles installed for the connection of electric vehicle charging shall have what specific protection?

What minimum height must a fence or screen be to enclose an outdoor electrical installation operating over 1000 volts to deter access by unqualified persons?

If overcurrent protection is omitted at a point where busway ampacity is reduced in industrial establishments, what is the minimum required ampacity of the smaller busway relative to the next upstream overcurrent device rating?

If nonmetallic raceways are used for permanent wiring, they must be encased in not less than what minimum thickness of concrete?

Raceways installed on poles for conductors emerging from the ground must extend from the minimum cover depth to a point at least how high above finished grade?

In dwelling units, the nominal voltage between conductors supplying the terminals of luminaires shall not exceed what value?

The ampacity of conductors supplying multimotor and combination-load equipment must not be less than what marked rating on the equipment?

This Code covers the installation of electrical conductors, equipment, and raceways for which type of premises?

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?

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?

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

How can the grounded conductor of aerial cable be identified if it does not have a continuous white or gray outer finish?

When an interactive single-phase, 2-wire fuel cell output is connected to the grounded or neutral conductor of a 3-wire system, the sum of the maximum unbalanced neutral load current plus the fuel cell system output rating shall not exceed what property of the grounded or neutral conductor?

In urban water-pipe areas, if the grounded conductor has at least four water-pipe connections, the metal interconnection shall be permitted to be made to the secondary neutral conductor with omission of what direct connection?

What condition does a ground-fault signal device indicate in a Legally Required Standby System?

When multiconductor jacketed cables that are not in raceways are used in Solar PV systems, they must be secured at intervals not exceeding what maximum distance?

For Communications Systems in one- and two-family dwellings, which listed cable is permitted to be installed in locations other than air-handling spaces or risers?

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

Which condition permits the use of soft conversion instead of hard conversion for units of measurement?

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?

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?

Where multiple control points are used for applicator energization, a means shall be provided and interlocked so that the applicator can be energized from how many control points at a time?

Cannabis oil preparatory equipment, extraction equipment, booths, and post-processing equipment must be listed and marked to show what characteristic?

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?

If replacement receptacles are made in locations specified in 210.12(A)}, (B), or (C), which replacement option is not permitted?

If load connection in an Optional Standby System is automatic, the standby source must be capable of supplying the full load that is automatically connected, or what alternative measure must be in place?

In addition to the manufacturer’s name, model identification, and input data, what other information is required on the nameplate of each heating equipment?

For bonded portable generators / 15(kW) or smaller), where must GFCI protection be provided?

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

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

For a one-family dwelling supplied by a feeder, what is the minimum required rating for the feeder disconnecting means?

If an alternate source for a Legally Required Standby System does not provide ground-fault protection of equipment with automatic disconnecting means, what required indication must be provided?

How shall busway be connected to grounding components?

Electrode-type boilers are covered in Part VIII of Article 424 for operation at what maximum nominal voltage?

When cables are installed in a pipe organ, how must they be secured?

After installation and inspection of heating panels or heating panel sets, the surface covering them must be secured so that what specific action is prevented?

Receptacle assemblies for installation in countertop surfaces must be listed for what specific application?

When there is no control box for WPTE, the cord or cable supplying power to the primary pad shall be secured in place to restrict movement and prevent strain at the connection points. Where subject to vehicular traffic, what is required?

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

Which of the following is a permitted use for NUCC?

Supplementary overcurrent protective devices for subdivided loads must be accessible and suitable for branch-circuit protection, but they are not required to be what?

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?

The temperature-limiting means on a water heater must be installed to sense maximum water temperature and be either a trip-free, manually reset type or what other type?

Where shall the disconnecting means for a building or structure supplied by a feeder be installed?

External surfaces of outdoor electric deicing and snow-melting equipment that operate at temperatures exceeding 60 (C) / 140 (F) shall be protected by which means?

For indoor equipment installed where flammable vapor–air mixtures can exist under normal operation, what is the extent of the Division 2 / Zone 2 classified area above the floor or grade level?

Flexible cords used in Zone 1 and Zone 2 locations must be of a type listed for what specific usage?

If the supply conductors from a permanently installed outdoor generator set terminate at a disconnecting means in or on a building, what requirements must that disconnecting means meet?

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?

A receptacle outlet required for connection of pipe heating cable(s) must be located on the underside of a mobile home unit within what maximum distance of the cold water inlet?

For fixed wiring above hazardous (classified) locations in printing, dipping, and coating processes, which type of cable is permitted if terminated with listed fittings and installed and supported to avoid tensile stress?

Under an Assured Equipment Grounding Conductor Program (AEGCP), how often shall required tests be performed, at maximum?

What is the maximum overall usable length permitted for the cord and cable of the EVSE unless equipped with a listed cable management system?

Open service conductors must be attached to fittings identified for use with service conductors or to noncombustible, nonabsorbent insulators that are securely attached to what?

In supervised industrial installations (Part VIII), where the overcurrent device is rated over 800 amperes, the ampacity of the conductors it protects shall be equal to or greater than what percentage of the rating of the overcurrent device?

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

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

Ground-fault circuit-interrupter protection for personnel shall be provided for all EVPE receptacles. Where must the GFCI indication and reset be installed?

Cellular metal floor raceways or cellular concrete floor raceways are permitted only for supplying ceiling outlets or extensions to the area below the floor, and such raceways shall have no connections leading into or through what type of location above the floor?

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?

If fixed industrial process heating equipment requires supply conductors with over 60 (C) insulation, where is the required marking permitted to be located?

Receptacles mounted in boxes set back from the finished surface must be installed so the mounting yoke or strap is held rigidly at which location?

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

Mechanical interlocks in the housing of circuit breakers prevent complete withdrawal of the circuit breaker when the stored energy mechanism is fully charged, unless a suitable device is provided to prevent what function?

Suitability of identified equipment for a hazardous location can be determined by equipment listing or labeling, evidence of equipment evaluation from a qualified testing laboratory, or what other evidence?

How is the maximum current calculated for a Solar PV inverter output circuit?

The height requirements for the storage or location of the EVSE coupling means do NOT apply to which type of EVSE?

Where a luminaire is provided over a bathtub or in a shower stall in a park trailer, it must be of the enclosed and gasketed type, listed for the installation type, and what other mandatory protection?

Where two to six service disconnecting means in separate enclosures are grouped at one location, how many sets of service-entrance conductors are permitted to supply each or several such service equipment enclosures?

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

If a flexible cord is used to supply a room air conditioner, what is the maximum length permitted for a nominal, 120 volt rating?

For cord-connected equipment such as household refrigerators and freezers, what is permitted to serve as the disconnecting means?

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?

How is the type, size, and quantity of conductors used in prewired manufactured assemblies identified?

Two-wire dc circuits are permitted to be tapped from the ungrounded conductors of circuits having a grounded neutral conductor. What provision applies to the switching devices in each tapped circuit?

A demand factor of 75 percent is permitted for what minimum number of fixed appliances (1/4 hp or greater, or 500 watts or greater) served by the same feeder or service in a dwelling unit?

Which warning signal is not required to be provided (where practicable) for a permanently installed Optional Standby Source?

Which listed means of connection is not permitted for electrical connections at a fire pump motor terminal box?

What is the maximum fill percentage permitted for conductors, including splices and taps, at the point of the splice or tap in a nonmetallic wireway?

If power conversion equipment is listed and marked as “Suitable for Output Motor Conductor Protection,” the conductor between the power conversion equipment and the motor shall have an ampacity equal to or greater than the larger of 125 percent of the motor full-load current or what other minimum size?

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

An SPD is prohibited from being installed in circuits over what maximum nominal voltage?

Splices in portable power feeder cables over 2000Volts are not permitted. The terminations on these cables must be accessible only to whom?

When is mechanical ventilation NOT required for charging an electric vehicle in an indoor enclosed space?

If liquidtight flexible metal conduit (LFMC) or liquidtight flexible nonmetallic conduit (LFNC) is used for connections and installed in concrete, what must they be?

What is the maximum trade size permitted for NUCC?

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

Type 1 essential electrical systems shall be required for which category of patient care spaces?

Where required to be grounded, cord-connected appliances in a floating building shall be grounded by means of an equipment grounding conductor in the cord and what type of attachment plug?

Power distribution blocks installed on service conductors must be marked with what specific equivalent wording?

Which piece of information must be included on the manufacturer’s nameplate for each unit of an information technology system supplied by a branch circuit?

A motor provided with a thermal protector complying with 430.32(text{A})(2) or (text{B})(2) must be marked with what phrase?

Under what condition is FMT permitted as an equipment grounding conductor?

The demand factors set forth in Table 626.11(B) do NOT apply to the portion of electrical wiring systems that supply which units?

Which of the following is permitted to be used as the disconnecting means for a dc power supply in an electroplating system?

Means must be provided to disconnect the Solar PV system from all wiring systems including power systems, energy storage systems, and what other systems?

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?

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?

Which equipment is permitted to be connected to the supply side of the service disconnecting means?

The grounded conductor of overhead service conductors shall not be less than the minimum size required by which section?

According to Table 400.51(A)(2), when portable power feeder cables rated greater than 2000Volts are used in an ambient temperature of 10 (C) / 50 (F), what is the required multiplying correction factor?

Which load is permitted to have one set of service-entrance conductors installed to supply its circuits in two-family dwellings and multifamily dwellings?

What is the required background/letter color for labels used to mark Solar PV system DC circuit conductors on exposed raceways?

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?

A temperature-controlled switching device that indicates an “off” position and interrupts line current is permitted to serve as the disconnecting means only if it meets what condition?

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

For wiring between control panels and machine motors in a machine room, liquidtight flexible nonmetallic conduit (LFNC-B) of metric designator 12 (trade size 3⁄8) or larger shall be permitted in lengths up to what maximum distance?

In industrial establishments, the isolation transformer output voltage is permitted to be up to 132 Volts ac to ground, provided the pipeline or vessel being heated is completely enclosed in what?

Where is a multioutlet assembly prohibited regarding corrosive conditions?

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

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

How many 125-volt ac convenience outlets, rated 15- or 20-ampere, are required in each work area of the MDC?

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

If the opening to an outlet, junction, or switch point is less than 200 mm (8 in.) in any dimension, each conductor must be long enough to extend at least what distance outside the opening?

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

For non-solidly grounded Solar PV systems connected to associated distribution equipment, the equipment grounding conductor for the PV system output is permitted to serve as what?

Sealing requirements in bulk storage plants shall apply to what boundaries of the defined Class I locations?

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?

A listed self-protected combination motor controller is permitted in lieu of the devices specified in Table 430.52(text{C})(1). What is the maximum permitted adjustable instantaneous-trip setting for Design B energy-efficient and Design B premium efficiency motors?

A 12 AWG fixture wire has an ampacity that is how much greater than an 18 AWG fixture wire?

Where an attachment plug and receptacle serve as the disconnecting means in accordance with 440.13, what is required regarding their location?

All exterior surfaces of portable lighting equipment that might come in contact with battery terminals, wiring terminals, or other objects shall be of nonconducting material or shall be effectively protected with what?

The frames and enclosures of portable electrical equipment used within the cell line working zone shall not be grounded, except under which condition regarding voltage?

Which equipment is explicitly not permitted to be installed in projection rooms?

Under what conditions is it permissible to extend a metal multioutlet assembly through dry partitions?

What must be installed to isolate from all sources of voltage each capacitor, capacitor bank, or capacitor installation that will be removed from service as a unit?

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

In areas subject to vehicular traffic (Column 6), what is the minimum cover required for direct-buried cables (Column 1), regardless of voltage level?

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

If a Power Source output connection is made to a feeder at a location other than the opposite end from the primary source overcurrent device, what is one method to protect the portion of the feeder on the load side of the connection?

If a separate equipment grounding conductor (not part of a listed cable assembly) is installed underground in an agricultural building environment, what condition must be met?

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

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

To prevent submersion of unlisted electrical equipment enclosures used adjacent to a fish farm pond, no portion of the enclosure not specifically identified for operation while submerged shall be located below which established horizontal plane?

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

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

Wiring that exits a portable equipment rack for connection to other equipment must be terminated in a manner that ensures a pull on the flexible cord or cable will not increase the risk of fire or what else?

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

For spray painting operations in temporary membrane enclosures, what must be done to the scaffolding used?

A listed emergency shutoff device or electrical disconnect for a marina power outlet must be clearly marked with which words in accordance with 110.22(A)?

Electrical equipment in the hoistway or on the car is exempted from full working space requirements if it is provided with flexible leads to all external connections so that it can be:

For high-impedance grounded systems where the maximum ground-fault current is designed to be not more than 10(amperes) and the equipment is rated for continuous duty, what is the maximum rating permitted for the overcurrent device installed on the line side of the grounding autotransformer?

For heating equipment containing no motor rated over 1/8text{ horsepower}, the disconnecting means must be within sight from the motor controller(s) and the heater, or shall be lockable as specified in 424.19, or shall be what?

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

When adding electric space heating or air-conditioning to an existing dwelling, the central electric space heating load shall be calculated at what percentage, according to Table 220.83(B)?

What is the minimum size of bare copper conductor required for a ground ring encircling the building or structure?

Switchboards and switchgear that have exposed live parts must be located in permanently dry locations and accessible only to whom?

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

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?

For a stairway chairlift supplied by batteries as the primary source, what connection method is permitted instead of a fused motor circuit switch or circuit breaker?

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?

If the personnel protection system interrupting device for a fastened-in-place EVSE is located within the supply equipment enclosure, what installation requirement applies regarding the power-supply cord?

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?

Conductors and cables in the boatyard shall be routed to avoid wiring closer than what minimum distance from the outer edge or any portion of the yard that can be used for moving vessels or stepping/unstepping masts?

Where is Type AC cable permitted to be run or fished in masonry block or tile walls?

Where NUCC enters a box, fitting, or other enclosure, what must be provided to protect the conductor or cable from abrasion, unless equivalent protection is provided?

What is the maximum percentage of the interior cross-sectional area that the sum of the cross-sectional areas of all contained conductors and cables shall not exceed in a nonmetallic auxiliary gutter?

How frequently must NUCC be clearly and durably marked?

For a circuit operating at 15 kV between phases, what is the minimum required elevation for unguarded live parts above the working space?

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?

No functions other than those specifically listed in 517.33 shall be connected to which branch of the Type 1 essential electrical system?

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

Angle connectors used with FMC shall not be what?

What action is an Energy Management System (EMS) explicitly prohibited from performing regarding Emergency Systems?

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

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

Each feeder disconnect rated 1000 amperes or more installed on a solidly grounded wye electrical system must be provided with ground-fault protection of equipment, provided the system voltage phase-to-phase does not exceed what value?

What characteristic defines a Zone 20 location?

GFCI protection for personnel shall be provided for outlets not exceeding what maximum voltage that supply a boat hoist installed at docking facilities?

Bridge wire contact conductors shall be kept at least how far apart?

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

Switches or other equipment operating at 1000 Volts, nominal, or less and serving only equipment within a transformer enclosure shall be permitted to be installed in the enclosure if accessible only to whom?

Receptacles used for shore power, rated 60 amperes or higher, shall be of which specific type?

When fixed electrical equipment is mounted on an energized conductive surface, what bonding action is required?

If cable tray systems are made of ferrous material, how must they be protected from corrosion?

The main disconnecting means must be legibly marked in the field with which information, in addition to the date of calculation?

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

Electrical equipment enclosures installed on piers above deck level shall be securely and substantially supported by what means?

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?

What material characteristics must ENT not exceed?

Where is the control drawing identification typically marked on the apparatus?

For a power inlet used with a portable generator, which specific warning must be displayed if the system is intended for connection of a bonded neutral system?

What is the mandatory listing requirement for Energy Storage Systems (ESS)?

Under what condition is EMT not permitted to be used?

Markings on electric radiant heating panels and heating panel sets must be permanent and in a location that is visible prior to application of what component?

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?

Overcurrent protection for infrared lamp commercial and industrial heating appliances shall not exceed what maximum rating?

Battery and other low-voltage circuits in a park trailer must be physically separated from circuits of a different power source by at least what minimum gap?

What is the minimum required rating for the feeder or branch-circuit disconnecting means for all installations other than one- or two-circuit or one-family dwelling installations?

Equipment, other than in dwelling units, rated 1000 amperes or more and supplied by a feeder, must have a permanent arc flash label applied that includes what specific item, in addition to meeting 110.21(B) requirements?

For replacement electrical connections located below the electrical datum plane in a body of water installation, what is the required characteristic regarding their listing?

A Type G portable power cable must include equipment grounding conductor(s) and is rated 2000Volts. If this cable has four power conductors, how many equipment grounding conductors are required by the Trade Name description in Table 400.4?

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

Noncombustible surfaces that are broken or incomplete around a flush-type cabinet or cutout box cover must be repaired so that the gaps do not exceed what maximum dimension?

Permanently wired radiant electric heaters serving a swimming pool deck area must be mounted at least what vertical distance above the pool deck, unless otherwise approved?

Which outdoor enclosure type protects against incidental contact, rain/snow/sleet, and windblown dust, and whose operating mechanism is operable when ice covered?

If a metal conduit passes completely through a Zone 2 location without requiring a seal, what is the minimum distance required for the conduit run to be free of fittings beyond each boundary?

For a feeder supplying a continuous load of 50 amperes and a noncontinuous load of 30 amperes, what is the minimum required ampacity for the feeder conductors, assuming the overcurrent device is NOT listed for 100 percent operation?

Nonmetallic extensions shall be attached only to what types of surfaces?

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

In which type of hazardous location is PVC conduit prohibited unless specifically permitted by other articles of the Code?

What specific protection must be provided for 125-volt, 15- or 20-ampere receptacle outlets located adjacent to a bathroom lavatory in a recreational vehicle?

Buildings with Solar PV systems requiring rapid shutdown must have a permanent label with which capitalized title having a minimum height of 9.5 mm (3/8 in.)?

The attachment plug and cord connector for a TRU separable power-supply cable assembly, rated 60-ampere, 208-volt, 3-phase, 3-pole, 4-wire, shall be intended for use with which corresponding inlet/receptacle rating?

Flexible cords and flexible cables are permitted for connection of utilization equipment to facilitate which action?

For a box supported by a conduit pendant stem longer than 450 mm (18 in.), what device must be used to connect the stem to the wiring system?

Organic material that is carbonized or excessively dry is highly susceptible to what specific hazard?

All 125-volt, single-phase, 20-ampere receptacle outlets that are not a part of the permanent wiring and are in use by personnel for temporary power must have what specific protection?

What is required to mark supply circuits and interconnecting cables identified for future use?

A disconnecting means is required for all ungrounded conductors derived from a stationary standby battery with a voltage over what minimum rating?

What is the maximum length permitted for power-supply cords used to connect information technology equipment to branch circuits?

Bolted pressure contact switches must have barriers that prevent what action?

For motor circuits rated over 1000 Volts, operation of the overload interrupting device must simultaneously disconnect what?

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

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?

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

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

Receptacle outlets that are part of a 15text{-kW} or smaller portable generator must have listed ground-fault circuit-interrupter protection for personnel integral to the generator or receptacle, as indicated in 445.20(A) or (B). What is the maximum rating in text{kW} for these portable generators?

Cartridge fuses and fuseholders of the 300-volt type shall be permitted to be used in single-phase line-to-neutral circuits supplied from a 3-phase, 4-wire, solidly grounded neutral source where the line-to-neutral voltage does not exceed what voltage?

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

In installations within a surface of wood or other combustible material, how must boxes, plaster rings, extension rings, or listed extenders be installed?

In prewiring for air-conditioning installation in a recreational vehicle, the prewire circuit shall terminate in a junction box with a blank cover or other listed enclosure, and the ampere rating marked on the safety label shall not exceed what percentage of the circuit rating?

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

Terminals of 15(ampere) and 20(ampere) snap switches not marked CO/ALR shall be used only with which conductors?

When an electrical installation is modified affecting the available fault current at the service, what action is required regarding the existing field marking?

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

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

Which of the following is an acceptable type of disconnecting means permitted for an arc welder?

A location shall not be required to be classified if the authority having jurisdiction can satisfactorily determine that flammable liquids having a flash point below 38 (C) / 100 (F), such as gasoline, will not be handled.

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)?

What is the maximum interval permitted for securing and supporting FMC?

What must be provided for the cord or cable at the busway plug-in device and equipment terminations?

The pipeline, vessel, or both, that is being heated and operating at a voltage greater than 30 Volts but not more than 80 Volts must be grounded where?

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

HDPE conduit shall not be used where subject to ambient temperatures in excess of what value, unless listed otherwise?

Fixed equipment located above hazardous (classified) locations that might produce arcs, sparks, or hot metal particles must be of the totally enclosed type or constructed to prevent what?

Where must a permanent and legible single-line diagram of the local switching arrangement be provided when the possibility of backfeed exists?

Open conductors passing through structural members must be separated from contact with the member by what component?

Applying demand factors listed in Table 530.7 is permitted when sizing feeder conductors for what specific load?

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

When is RTRC permitted for exposed work?

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

What must the hard service cord or portable power cable types used for cord-connected EVSE be listed for exposure to?

Luminaires exposed to water from condensation, building cleansing water, or solution in an agricultural building shall be listed for what specific use?

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

According to Column A of Table 400.5(A)(1), what is the ampacity for a 12 AWG Type SO flexible cord connected so that only three conductors are current-carrying?

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

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?

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?

What special provision is made for splices in pipe organ conductors?

For the purpose of this Code, which system of measurement is the preference?

Multimotor and combination-load equipment is not required to be marked with the minimum supply circuit conductor ampacity and the maximum rating of the branch-circuit short-circuit and ground-fault protective device if it is what type of equipment?

The disconnecting means for the normal power source of a fire pump must be lockable in the closed position, and what must be true about the provision for locking?

What must be assured in the construction and installation of metal wireways?

Cable assemblies and flexible cords and cables installed as temporary branch circuits or feeders shall not be installed on which location?

A resistance-type boiler employing immersion heating elements contained in an ASME-rated and stamped vessel, if rated more than 120(amperes), must have the heating elements subdivided into loads not exceeding what maximum current?

All wiring methods permitted in Zone 20 locations are also permitted in which other zone location?

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

What information must each section of a flexible bus system be marked with?

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

Where written safety procedures are in place for industrial installations with supervision, the runway conductor disconnecting means for electrolytic cell lines is permitted to be placed out of view of the runway contact conductors, provided that only which personnel service the equipment?

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?

If standby currents are not given on the nameplate for induction heating equipment, what value shall be used as the standby current for calculating supply conductor ampacity?

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

For buildings that have Solar PV systems with more than one rapid shutdown type, a detailed plan view diagram of the roof must show the areas that remain energized after shutdown using what graphical element?

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

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

What system is permitted to be installed on all floors of a building exceeding three floors above grade, allowing ENT to be used exposed or concealed?

The conductor insulation in irrigation cable must be of a type listed in Table 310.4(1) for use in wet locations and for an operating temperature of how much?

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

If a separate equipment grounding conductor is used for branches from busways, which NEC sections must the connection of the EGC comply with?

What symbol and subsequent elements must follow the Zone marking on equipment meeting one or more of the protection techniques described in 506.8?

Voltage (potential) transformers installed indoors or enclosed must be protected with what type of device?

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?

In multiwire branch circuits, the continuity of a grounded conductor shall not depend on what?

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

Where selective coordination is required, all feeder overcurrent protective devices supplied directly by the service overcurrent protective device shall be selectively coordinated with what device?

Where flexibility is necessary after installation, what is the maximum permitted length of unsecured LFMC for trade sizes 1 1/2 through 2 (metric designators 41 through 53)?

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?

Where an exit enclosure is required to have a fire resistance rating, what type of electrical wiring methods shall be installed within the exit enclosure?

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

Which two types of threaded conduit are permitted as wiring methods in Class I, Division 1 locations?

Which of the following conditions is a permitted use for LFMC?

An emergency shutdown device mounted on the exterior of the generator enclosure is permitted to satisfy the emergency shutdown requirements in which occupancy type?

Where PVC conduit is subject to physical damage, what specific grade of PVC conduit must be used?

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?

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

Where couplings and connectors used with EMT are installed in wet locations, they shall comply with which specific NEC section?

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

Documentation of the engineered design for support structures must include consideration of factors such as soil conditions, weight of supported conductors, weather loading, and what other factor?

For a wye-start, delta-run connected motor, what is the minimum required ampacity percentage for the conductors between the controller and the motor?

Bushings or approved fittings must be used where the leads of heating panels or heating panel sets emerge where?

For a wye-start, delta-run connected motor-compressor, the branch-circuit conductors between the motor controller and the motor-compressor are permitted to be based on what percentage of the motor-compressor rated-load current or branch-circuit selection current (whichever is greater)?

Where is it generally prohibited to locate splices and taps within a luminaire?

Screw shell lampholders shall not be used with infrared lamps rated over 300(watts) unless the lampholders are identified for what specific use?

Electric space-heating equipment rated more than 48(amperes) and employing resistance heating elements must have the heating elements subdivided, and each subdivided load shall not exceed what maximum current?

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

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

For generators rated more than 15(kW) , the nameplate or instructions must provide the alternator temperature rise at rated load and what other piece of information about the alternator?

Motors driving single or multiple dc generators supplying a system operating on a cyclic load basis do not require overload protection if the thermal rating of the ac drive motor cannot be exceeded under what condition?

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

A test report covering the results of the required pre-energization and operating tests of the electrical system must be delivered to the authority having jurisdiction at what time?

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

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

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

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?

Which two cable types shall not be used to connect a range or dryer in a mobile home installation?

Under whose supervision must flexible bus systems be installed?

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

What is the ampacity for a 12 AWG, 90°C conductor, when there are up to four simultaneously energized ac conductors in a cable, rated for 60-minute service?

What must be provided where multiple disconnecting means are required for a motor receiving energy from more than one source?

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

In industrial occupancies, infrared industrial process heating equipment lampholders are permitted to be operated in series on circuits of over 150 Volts to ground, provided what rating requirement is met?

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

If a metal panelboard cabinet is used with nonmetallic raceway or cable, what must be secured inside the cabinet?

What characteristic must IBP systems be used within regarding temperature?

Outdoor overhead conductors over 1000 volts are permitted for what three circuit types?

If overcurrent protection is omitted where flexible bus systems are reduced in size in industrial establishments, what is the minimum required current rating of the smaller system relative to the upstream OCPD?

Nonmetallic boxes are permitted for use with which wiring methods?

To limit unbalanced voltages, single-phase power sources in interactive systems shall be connected to 3-phase power systems such that the unbalanced voltages at the point of interconnection do not exceed what maximum percentage?

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?

The conductors used to connect the SPD to the line or bus and to ground must not be any longer than necessary and shall avoid what?

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

What is the maximum continuous current permitted for bare copper bars in sheet metal auxiliary gutters?

For infrequent flexing use of metric designator 12 (trade size 3/8) FMT, what is the minimum radius (in inches) of bends measured to the inside of the bend?

If the grounded conductor terminal in a polarized attachment plug is not visible, how shall the conductor entrance hole be identified?

Where heaters 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 the heater is marked with a minimum conductor size, and what specific control device is used?

For service and feeders supplying electrified truck parking spaces, what is the minimum allowable demand factor for a location in Climatic Temperature Zone 1 (USDA Hardiness Zone 1)?

An interconnection of the surge-arrester ground and the secondary neutral conductor, other than those provided in 242.54(A) or (B), shall be permitted only by what requirement?

What is the ampacity for a 3/0 AWG, 75°C conductor, when there are up to four simultaneously energized dc conductors in a raceway, rated for 30-minute service?

What device must be provided in the X-ray control supply to control the load resulting from failures in the high-voltage circuit?

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

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

For limited finishing workstations, the area inside the 3 ft. space horizontally and vertically beyond the volume enclosed by the curtains or partitions shall be classified as what?

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?

Dimmer and electronic control switches shall be used only to control which type of loads, unless listed for the control of other loads?

Mandatory rules are characterized by the use of which term(s)?

What is the maximum trade size RMC shall NOT be larger than?

What specific additional marking is permitted on surface nonmetallic raceways?

In a major repair garage (lighter-than-air fuels), the area within 18 in. of the ceiling is unclassified if ventilation of at least 0.3text{ m}^{3}/text{min}/text{m}^{2} / 1text{ ft}^{3}/text{min}/text{ft}^{2}) is provided with suction taken from where?

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

A motor-compressor controller must have both a continuous-duty full-load current rating and a locked-rotor current rating not less than what minimum rating?

Solar PV systems with PV system DC circuits operating at 80 volts DC or greater between any two conductors shall be protected by what listed device?

Equipment listed and marked for use in Zone 20 locations shall be permitted in what Class II Division locations?

Distribution cutouts shall not be used in which location?

What is the maximum distance LFMC shall be securely fastened from each box, cabinet, conduit body, or other conduit termination?

For one-family and two-family dwellings, where must a disconnecting means or its remote control for a stationary standby battery be located for emergency use?

The heating portion of radiant heating panels and heating panel sets shall not be installed in or behind surfaces where subject to what?

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

A Zone 0 location is defined as an area where ignitible concentrations of flammable gases or vapors are present continuously or for how long?

If a motor overload device can restart a motor automatically after overload tripping, it shall not be installed if automatic restarting of the motor can result in what?

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

In accessible attics, where conductors run through bored holes in joists/studs/rafters, they must be protected by substantial running boards extending to what minimum height above the floor/floor joists?

Exposed elements of impedance heating systems must be protected against contact by personnel by being physically guarded, isolated, or thermally insulated with what component?

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

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?

For a circuit operating at a nominal voltage of 480Y/277 volts, what is the minimum required depth of working space in front of exposed live parts, where there are grounded parts on the opposite side (Condition 2)?

Where ventilation is required for indoor charging, the ventilation system must include which components and be permanently installed to intake from, and vent directly to, the outdoors?

In ceiling heating cable installations, the entire ceiling surface must have a finish of thermally noninsulating sand plaster that has a nominal thickness of what minimum size?

When reconditioned equipment is required to be listed by the Code, which action must be taken?

Labels required for intrinsically safe wiring methods must be permanently affixed and have what wording, or equivalent?

Field-assembled extension cords and multiconductor cable assemblies consisting of listed connectors and cable are permitted in what specific areas of studios and remote locations?

When combination surface metal raceways are used for both signaling and power circuits, how must the different systems be run?

NPT threaded entries into explosionproof or flameproof equipment must be made up with at least how many threads fully engaged?

Junction boxes used with underfloor raceways must be leveled to the floor grade and sealed against what?

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

Fixed luminaires marked for use only in Class I, Division 2 or Class II, Division 2 locations shall not be required to indicate what marking?

When calculating the total farm load (Table 220.103), what demand factor applies to the Third largest load?

All joints between lengths of PVC conduit, and between conduit and couplings, fittings, and boxes, shall be made by what method?

Where more than one piece of equipment is operated from the same high-voltage circuit, what must be provided for each piece or group of equipment as a unit?

What is the minimum size of aluminum or copper-clad aluminum conductor permitted for voltage ratings up to and including 2000 volts?

What must be installed at each connection point, outlet, switchpoint, or junction point in the wiring system?

For secondary ties operating under conditions described in 450.6(text{A})(1) and (text{A})(2), both supply ends of each ungrounded tie conductor must be equipped with a protective device that opens at a predetermined temperature under what conditions?

Heating elements of cables installed in ceilings must be separated at least what minimum distance from the edge of outlet boxes and junction boxes used for mounting surface luminaires?

Flexible cables and cords approved for hard or extra-hard usage are permitted to be laid on floors in exhibition halls provided they are protected from contact by whom?

An insulated conductor used within a switchboard or switchgear must be listed, flame retardant, and rated not less than what voltage?

Diffraction- and irradiation-type industrial/commercial laboratory equipment not effectively enclosed or interlocked must be provided with a positive means to indicate when they are energized, such as a pilot light, a readable meter deflection, or what?

When a cord- and attachment-plug-connected room air conditioner is the only load on a branch circuit, the total marked current rating shall not exceed what maximum percentage of the current rating of the branch circuit?

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?

If a metal pole with a hinged base is used, what action is specifically required regarding the hinged base and the pole?

What is the rating of the listed mobile home power-supply cord permitted for a mobile home that is factory equipped with gas or oil-fired central heating equipment and cooking appliances?

Power supply nonheating leads shall be protected where they emerge from electrically heated pipeline or vessel heating units by rigid metal conduit, intermediate metal conduit, electrical metallic tubing, or what other means?

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

According to Table 400.44(B)(2), what is the nominal insulation thickness in mils required for a 1 AWG power conductor in a portable power feeder cable rated 15001 to 25,000 Volts?

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

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?

Power circuits supplying an electric motor-driven fire pump shall not have what type of automatic protection?

What is the minimum size of LFNC generally permitted?

If covers and accessories of nonmetallic materials are used on surface metal raceways, what must be true about them?

The flexible power supply cord used for cord- and plug-connection of freestanding office furnishings shall be extra-hard usage type with conductors of what minimum size?

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

When calculating wire-bending space at terminals for compact stranded AA-8000 aluminum alloy conductors up to 1000 kcmil, which column of Table 312.6(A) should be used?

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

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

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?

If AFCI protection is achieved by installing a listed outlet branch-circuit-type AFCI at the first outlet, and metal raceway meeting 250.118 requirements is used for the entire run between the OCPD and the first outlet, what condition is required regarding the wiring continuity?

In a completed installation, when must an outlet box containing a ceiling-suspended (paddle) fan be provided with a cover?

What orientation is explicitly not permitted for a receptacle installed in any countertop in a mobile or manufactured home?

When supplying Class 2 or Class 3 Circuits, what rule applies if the power sources have output connections that are paralleled or otherwise interconnected?

Where is ENT permitted to be installed concerning suspended ceilings?

Which voltage level triggers the requirement for hazard labels or signs that read “DANGER — HIGH VOLTAGE — KEEP OUT” on heating equipment access doors or panels?

Any agricultural building or structure for livestock located on the same premises shall be supplied from what type of point?

Where service heads or goosenecks cannot be located above the point of attachment of the service conductors, the service head or gooseneck location shall be permitted not farther than what maximum distance from the point of attachment?

What characteristics must the nonmetallic underground conduit portion of NUCC possess regarding moisture and chemicals?

Where are surface nonmetallic raceways prohibited, concerning concealment?

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?

Where a dc busway system is installed, the disconnecting means shall be permitted to be incorporated into what component?

Refrigerant machinery rooms using ammonia may be classified as “unclassified” if equipped with adequate mechanical ventilation that operates continuously or is initiated by a detection system at a concentration not exceeding what ppm?

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

What must each vented cell be equipped with?

The permanent markings on electrode-type boilers must be located so as to be what after installation?

All gasketed enclosures containing circuit breakers or switches shall be arranged with which feature to discharge condensation?

An insulated copper equipment grounding conductor, identified along its entire length by green insulation, must be connected to the non-current-carrying conductive surfaces of fixed electrical equipment likely to become energized operating at what minimum voltage?

Which enclosure type, rated not over 1000 volts, is suitable for outdoor use and provides protection against rain, snow, sleet, windblown dust, hosedown, and corrosive agents?

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

Under what condition is the equipment grounding conductor NOT required in ENT?

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

In no case shall the feeder or service calculated load for commercial kitchen equipment be less than the sum of what?

A separable power-supply cable assembly used for a 20-ampere, 1000-volt, 3-phase TRU connection shall use an attachment plug and cord connector intended for use with which voltage and ampere rating?

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

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?

For fixed and stationary diagnostic imaging and treatment equipment, what is the minimum required capacity rating of the disconnecting means provided in the supply circuit?

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

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

Which provision shall not apply to the installation of a single conductor in a ferromagnetic envelope in skin-effect heating?

How must disconnecting links in busways over 1000 volts be plainly marked?

For open construction piers, enclosures (tubs, voids, pits, etc.) where flammable liquids or vapors can accumulate within 20 ft. of the dispenser shall be what type of classified location?

For equipment provided with threaded entries for metric-threaded fittings, how many threads must be fully engaged when metric-threaded fittings are installed?

For a permanently installed outdoor housed generator set, if the readily accessible disconnecting means is located within sight of the building supplied, is an additional disconnecting means required where ungrounded conductors pass through the building?

All wiring systems between floating buildings and the supply conductors must be installed so that motion of the water surface and changes in the water level will not result in which outcome?

Underfloor raceways are permitted beneath the surface of concrete or other flooring, or in office occupancies where laid flush with the concrete floor and covered with what?

In a location where flammable anesthetics are employed, the hazardous (classified) location is considered to be Class I, Division 1 and extends upward to what height above the floor?

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

What type of apparatus is an exception to the listing requirement in Article 504?

Service conductors installed as open conductors must have a clearance of not less than 900 mm (3 ft) from which opening in a building?

The Solar PV system disconnecting means must have sufficient ratings for the maximum circuit current, available fault current, and what other electrical property available at its terminals?

The cable for cord-connected EVSE must comply with what standard regarding its usage rating, besides types specified in 625.17(B)(1)?

Equipment intended for Interconnection and Interactive operation with power production sources must meet which requirement?