NEC CODE

For storage battery racks there shall be a minimum clearance of inch between a cell container and any wall or structure on the side not requiring access for maintenance.

1 inch 480.9(C)

All heating elements that are rated over ampere, replaceable in the field, and a part of an appliance, shall be legibly marked with the ratings in volts and amperes, or in volts and watts, or with the manufacturer's part number.

1 ampere 422.61

A discharge circuit shall either be permanently connected to the terminals of the capacitor or be provided with means of connecting it to the terminals of the capacitor bank after disconnection of the capacitor from the source of supply.

automatic 460.28(B)

The upper end of made electrodes of iron or steel rods must be flush with or______ground level unless otherwised protected.

below 250.53(G)

A junction box must have a separately for each conductor wherever a charge is made from NM-B cable to open wiring or to concealed knob-and-tube wiring.

bushed hole 300.16(A)

A fixed storage-type water heater that has a capacity of 120 gallons or less shall be considered a for the purposes of sizing branch circuits.

continuous load 422.13 and Informational Note, 422.10

In a health care facility, the branch-circuit of the electrical emergency system shall supply power for task illumination, fixed equipment, selected receptacles and special power circuits related to patient care.

critical 517.33(A) (1) Through (9)

1/0 copper conductors installed in vertical raceways shall be supported at intervals not exceeding. feet.

100 feet 300.19(A). Table 300.19 (A)

An enclosure mounted to structural or supporting elements of a suspended ceiling shall not be more than______in in size.

100 in 314.23(D)

Openings around electrical penetrations through fire-resistant rated walls, partitions, floors, or ceilings shall be using approved methods to maintain the fire resistance rating.

fire-stopped 300.21

A circuit conductor shall be permitted to ground noncurrent-carrying metal parts of equipment raceways and other enclosures on the supply side of the service disconnecting means.

grounded 250.142 (A)(1)(2)(3)

Neither the frame of the mobile home nor the frame of any appliance shall be connected to the circuit conductor in the mobile home.

grounded 550.16

Noncurrent-carrying metal parts of non medical-type X-ray high- voltage shielded cables shall be

grounded 660.48

In a solar photovoltaic system where the disconnect switch is not part of a ground-fault or arc-fault detection system, the disconnect shall not open the

grounded 690.17(D) and Ex.

Grounding conductors and bonding jumpers shall not be connected with devices or fittings that depend solely on

solder 250.8(B)

The grounding conductor for secondary circuits of instrument transformers and for instrument cases shall not be smaller than AWG copper.

12 AWG 250.178

The minimum size insulated copper equipment grounding conductor for pool-associated motors is AWG.

12 AWG 680.21(A)(1)

In a commercial garage, fixed electrical equipment that may produce arcs must be totally enclosed or constructed as to prevent escape of sparks or hot metal particles if mounted less than feet above floor level above a Class I location.

12 feet 511.7(B)(1)(a)

In general, new luminaires installed over the area extending 5 feet horizontally from the inside walls of an outdoor swimming pool must be at least feet above the maximum water level.

12 feet 680.22(B)(1)

GFCI protection is not required for a luminaire located more than feet above a hot tub installed indoors.

12 feet 680.43(B)(1)(a)

Type MC cable with a smooth sheath that is 1 inch in diameter shall have a bending radius of__________times the external diameter.

12 times 330.24A(2)

When supplying a nominal, 120-volt rated room air conditioner, the length of flexible supply cord shall not exceed feet.

10 feet 440.64

A horizontal raceway not less than feet will provide suitable means to prevent the entrance of dust between an enclosure that is dust-proof and one that is not.

10 feet 502.15(2)

At least one receptacle shall be located a minimum of 6 feet from and not more than feet from the inside wall of a spa or hot tub installed indoors.

10 feet 680.43(A)

Receptacles rated 125 volts and 30 amperes or less and located within feet of an indoor spa shall be protected with a ground-fault circuit-interrupter.

10 feet 680.43(A)(2)

Utility-owned communication conductors shall be permitted at a height of not less than feet above swimming pools.

10 feet 680.8(B)

Rapid shutdown of PV system circuits installed on or in buildings shall take place within seconds of rapid shutdown initiation.

10 seconds 690.12(2)

The ampacity of supply branch-circuit conductors and the overcurrent protective devices supplying x-ray equipment shall not be less than 50 percent of the momentary rating or percent of the long-time rating, whichever is the greater.

100% 660.6(A)

Heating panels or panel sets installed under floor covering shall not exceed watts per square foot of heated area.

15 watts 424.99(B)

The residual voltage of a capacitor rated 1000 volts, nominal, and under shall be reduced to 50 volts, nominal, or less, within minute after the capacitor is disconnected from the source of supply.

1 minute 460.6(A)

A 480 to 208-volt transformer has a primary amperage of 1.5 amps. What is the maximum overcurrent device allowed where = there is only primary protection?

1.5 amps x 300% 4.5 amps Table 450.3(B) 450.3b

What is the maximum ambient temperature allowed before derating is required from Table 310.15 (B)(16)?

30°C Table 310.15.b.16

Angle pull dimensional requirements apply to junction boxes only when the size of the conductor is equal to or larger than____AWG.

4 AWG 314.28(A)

The length of a dishwasher cord shall be 3 feet to feet measured from the face of the attachment plug to the plane of the rear of the appliance.

4 feet 422.16 (B)(2)(2)

A light fixture that weighs more than____Ibs. shall be supported independent of the outlet box unless the outlet box is listed and marked for the maximum weight to be supported.

50 lbs. 314.27(A)(2)

Pipe organ circuits shall be so arranged that 26 AWG and 28 AWG conductors shall be protected by an overcurrent device rated at not more than amperes.

6 amperes 650.8

Where attic space is not accessible by permanent stairs, NM-B cable shall be protected by substantial guard strips within________feet of the nearest edge of the attic entrance.

6 feet 334.23, 320.23(A)

Typically in a patient room, the patient care vicinity encloses a space within the room not less than 6 feet beyond the perimeter of the bed in its nominal location, and extending vertically not less than feet above the floor. mio m

7/½ 517.2, Definitions

The_________ °C rating shall be permitted to be used for ampacity adjustment and correction calculations of Type NM-B cable, provided the final derated ampacity does not exceed that for a 60°C rated conductor.

90 C 334.80

Noncombustible surfaces that are broken or incomplete around boxes employing a flush-type cover or faceplate shall be repaired so there will be no gaps or open spaces greater than_____inch, at the edge of the box or fitting.

1/8 inch 314.21

Health care low voltage equipment and instruments frequently in contact with bodies of persons shall operate on an electrical potential of volts or less.

10 volts 517.64(A)(1)

Wiring located above heated ceilings shall be spaced not less than inches above the heated ceiling.

2 inches 424.36

Wiring located above electric heating panels shall be spaced above the heated ceiling not less than inches.

2 inches 424.94

A de-icing panel must be installed on an asphalt base of at least inches.

2 inches 426.20(C)(L

Conductors and cables of intrinsically safe circuits installed within enclosures shall be separated at least and secured from conductors and cables of any nonintrinsically inches safe circuits.

2 inches 504.30 (A)(2)(1)

Nonmetallic raceways shall be encased in not less than inches of concrete when installed in an assembly hall.

2 inches 518.4(A)

Each plate electrode shall expose not less than____square feet of surface to exterior soil.

2 square feet 250.52(A)(7)

The most common nominal cell voltage is volts per cell for the lead-acid type storage batteries.

2 volts Definitions Nominal Voltage (Battery or Cell) 480. 2 Informational Note

What is the smallest trade size IMC allowed?

2- inch 342.20(A)

General-purpose and appliance branch circuits supplied by Flat Conductor Cable shall have ratings not exceeding______amperes.

20 amperes 324.10(B)(2)

The factory-installed attachment plug of cord-and-plug ba connected fixed electric pipeline or vessel heating equipment rated amperes or less and 150 volts or less to ground shall be permitted to be the disconnecting means.

20 amperes 427.55(B)

What is the maximum feeder ampacity allowed for (5) X-ray machines with momentary ratings of 125 amps?

131.25 amps 517.73(A)(2)

The ampacity of capacitor circuit conductors shall not be less than percent of the rated current of the capacitor.

135% 460.8(A)

Where installed at services of less than 1000 volts, line and grounding connecting conductors of surge-protective devices shall not be smaller than AWG copper.

14 AWG 285.26

What is the minimum size copper conductor permitted for general wiring under 2,000 vols?

14 AWG 310.106(A). Table 310.106 (A)

Straight runs of 1 1/4-inch Rigid Metal Conduit may be secured at not more than_______foot intervals.

14 foot 344.30(B)(2). Table 344.30 B(2)

In indoor areas where walls are frequently washed, conduit should be mounted with a minimum inch air space between the wall and the conduit.

14 inch 300.6(D)

Where nonmetallic sheathed cable is used, the cable assembly including the sheath shall extend into a nonmetallic box not less than______inch through a knockout opening.

14 inch 314.17(C)

Each patient bed in a critical care area minimum of single receptacles. shall be provided with a

14 receptacles 517.19(B)(1)

A separate overload relay which is responsive to motor- compressor current shall be selected to trip at not more than percent of the motor-compressor rated-load current.

140% 440.52(a)1

Boxes that enclose devices or utilization equipment supplied by 14 AWG or smaller conductors shall have a depth that is not less than_____inch.

15/16 inch 314.24(B)(5)

Storage battery cells in rubber or composition containers shall require no additional insulating support where the total nominal voltage of all cells in series does not exceed volts.

150 480.7(C)

Rigid nonmetallic conduit must be buried at least inches under airport runways.

18 inches 300.5(A), Table 300.5

The minimum burial depth for rigid nonmetallic conduit without concrete encasement and installed outside of a building is inches.

18 inches 300.5(A). Table 300.5

An enclosure smaller than 100 in' that contains a device(s) and is supported by raceways shall be secured within_____inches of the enclosure.

18 inches 314 23(F)

Rigid Metal Conduit shall be installed a minimum of_____inches under cinder fill.

18 inches 344.10(C)

Where a seal is required in a conduit supplying a panelboard in a Class I, Division I location it must be placed within inches of the enclosure.

18 inches 501.15(A)(1)

In an unventilated area a major repair garage used for service and repair of automobiles, the entire area up to a level of inches above the floor shall be considered a Class I, Division 2 location where gaseous fuels are transferred.

18 inches 511.3(C)(1)(b)

In unventilated ceiling areas of major repair garages where lighter-than-air gaseous fueled vehicles are stored or repaired, the area within inches of the ceiling shall be classified as Class I, Division 2.

18 inches 511.3(C)(2)(b)

Aircraft energizers shall be so designed and mounted that electric equipment and fixed wiring will be at least inches above floor level and shall not be operated in a Class I location as defined in 513.3 (C).

18 inches 513.10(C)(1)

Where space limitations prevent wiring from being routed 5 feet or more from a pool, 120-volt wiring installed in Schedule 40 PVC must be installed to a minimum cover depth of inches.

18 inches 680.10

Luminaires mounted on swimming pool walls shall be installed with the top of the fixture lens at least inches below the normal water level of the pool.

18 inches 680.23(A)(5)

For a standard box containing two cable clamps and one fixture stud, the number of conductors permitted shall be reduced by__________conductors.

2 conductors 314.16(B)(2)(3)

must A motor controller with a voltage rating, for example 240 volts or 480 volts, shall be permitted to be applied in a circuit in which the nominal voltage between any two conductors does not exceed the controller's voltage.

straight 430.83(E)

The termination of a flexible cord of an underwater luminaire e within a junction box, transformer or power-supply enclosure, ground-fault circuit-interrup:er, or other enclosure shall be provided with a

strain relief 680.24(e)

A motor disconnecting means shall open all conductors and shall be so designed that no pole can be operated independently.

supply ungrounded 430.103

Type FC assemblies are specifically designed for field installation in_______metal raceways.

surface 322.2

15- and 20-ampere, 125-volt receptacles intended to supply listed or shall employ a listed tamper- patient care areas of pediatric wards, rooms, or areas, shall be resistant cover.

tamper-resistant 517.18(C)

The lightning protection system ground shall be bonded to the building or structure grounding electrode system.

terminals 250.106

What is the maximum number of current-carrying conductors are allowed in a raceway before derating is required?

three 310.15 (B)(3)(a) Adjustment Factors

Why is type MI cable sealed at terminations?

to prevent entrance of moisture into the insulation 332.40 B

In general, the phase arrangement on a 3-phase motor control center bus shall be from front to back, top to bottom, or left to right, as viewed from the front.

А, В, С 430.97(B)

No transformer or shall be installed in a Class II, Division I Group E location.

сараcitor 502.100(A)(3)

Where flexibility is required, the maximum distance type AC cable may be supported from a terminal is______feet.

2 feet 320.30(D)(2)

Where nonmetallic conduit is used underground at a gasoline dispensing service station, threaded rigid metal conduit shall be used for the last feet of the underground run to emergence.

2 feet 514.8 Ex. 2

A heat tape outlet, if installed, and if located on the underside of a mobile home, shall be located within feet of the cold water inlet.

2 feet 550.13(E)(1)

The minimum trade size Liquidtight Flexible Metal Conduit enclosing the leads of a motor is______inch.

3/8-inch 350.20(A) Ex.., 348.20(A)(1)

The 100-amp, 120/240-volt, service equipment for a temporary job office trailer is required to be located within feet of the trailer.

30 feet 550.4(A), 550.32(A)

The rating of a branch circuit supplying a Flat Conductor Cable assembly to supply suitable tap devices for lighting, small appliances or small power loads, shall not exceed_______amperes

30 amperes 322.10(1)

What is the maximum ampere rating for a branch circuit supplying two or more outlets for fixed electric space heating equipment installed in a residential occupancy?

30 amperes 424.3(A)

Portable x-ray equipment connected to a 120-volt branch circuit of amperes or less may use a grounding-type attachment plug and receptacle of proper rating for a disconnecting means.

30 amperes 517.72(C)

The maximum rating of the overcurrent device on a 17-amp noncontinuous, single nonmotor appliance circuit is amps.

30 amps 422.11(E)(3), 220.5(B)

Screw-shell lampholders shall not be used with infrared lamps over 300 watts rating, unless the lampholders are identified as di being suitable for use with infrared heating lamps rated over watts.

300 watts 422.48(B)

Heating panels or heating panel sets shall not exceed watts per square foot of heated area, when installed on concrete or poured masonry.

33 watts 424.98(A)

The maximum operating temperature for 16 and 18 AWG insulated conductors used in MC Cable and suitable for 1000 volts or less shall not be less than________ °C.

330.112(A)

Grounding electrodes of pipe or conduit shall not be smaller than trade size_____inch.

34 inch 250.52 (A)(5)(a)

For outlet boxes or outlet box systems designed to support ceiling suspended paddle fans that weigh more than lbs., the required marking shall include the maximum weight to be supported.

35 lbs. 422.18, 314.27(C)

Dry-type transformers installed indoors and rated over volts must be installed in a vault.

35,000 volts 450.21(C)

Askarel-insulated transformers installed indoors and rated over volts shall be installed in a vault.

35,000 volts 450.25

In pull boxes or junction boxes having any dimension over_______ feet, all conductors shall be cabled or racked up in an approved manner.

6 feet 314.28(B)

Protection for AC cable is required within_____feet of the nearest edge of a scuttle hole that is not accessible by permanent stairs.

6 feet 320.23(A)

Type MC cable shall be supported and secured at intervals not exceeding_______feet.

6 feet 330 30(B) &(C)

Type MI cable shall be securely supported at intervals not exceeding______feet.

6 feet 332.30

Trade size 3/8-inch Flexible Metal Conduit used for tap connections______feet to luminaires must not exceed____feet in length.

6 feet 348.20 (A)(2) c

Where installed on the outside of Liquidtight Flexible Nonmetallic Conduit, the length of the equipment grounding conductor shall not exceed______feet.

6 feet 350.60, 250.102(E)(2)

An attachment plug and receptacle or cord connector shall be 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 room air conditioner are readily accessible and located within feet of the floor.

6 feet 440.63

A disconnect for a carnival ride must be installed within feet of the operator's station.

6 feet 525.21(A)

Other receptacles on the property not associated with pool equipment shall be located at least feet from the inside walls of a pool.

6 feet 680.22(A)(3)

All 125-volt, single-phase receptacles not exceeding 30 amperes and located within feet measured horizontally of the inside walls of a hydromassage tub shall protected by a ground- fault circuit-intemupter.

6 feet 680.71

A boiler employing resistance-type heating elements rated more than 48 amperes and not contained in an ASME rated and stamped vessel shall have the heating elements protected at not more than amperes.

60 amperes 424.72(B)

In a Class I location, the minimum thickness of the sealing compound of a completed seal shall not be less than the trade size of the conduit and in no case less than inch.

5/8 inch 501.15(C)(3)

The total marked rating of a cord- and attachment plug- connected room air conditioner shall not exceed percent of the rating of a branch circuit where lighting units or other appliances are also supplied.

50% 440.62c

The power supply to a mobile home shall be a feeder assembly consisting of not more than one listed -ampere mobile home power-supply cord or a permanently installed feeder.

50-ampere 550.10(A)

Combustible dust contains particles that are microns or smaller and present a fire or explosion hazard when dispersed and ignited in air.

500 500.2

Where a control circuit transformer rated primary current is less than 2 amps, an overcurrent device rated at not more than a percent of the primary current shall be permitted in the primary circuit.

500% 430.72(C)(4)

What size junction box is required for an angle pull of (3) 2-inch conduits containing conductors larger than 4 AWG?

6x2+2+2= 16"x16" Junction box 314.28A(1)

What size square junction box is required for an angle pull with (1) 3-inch conduit and (2) 2-inch conduits containing conductors larger than 4 AWG?

6x3+2+2 = 22" x 22" Junction box

An outdoor vault, ventilated by natural circulation of air to an outdoor area, containing a 75KVA transformer, requires a ventilating opening of square

75 x 3 in? = 225 in 450.45(c)

A 75 kVA, 480/208-volt, 3-phase transformer with a 4-wire secondary shall be provided with a maximum primary only overcurrent protective device not exceeding amps.

75,000 VA ÷ 831 90.25 amps X 125% = 112.8 amps Next standard size = 125 amps 450.3 table 450.3(b) note 1. 240.6

What is the minimum size copper main grounding electrode conductor needed for a 60-amp service fed with 6 AWG THHN copper conductors?

8 AWG (must be physically protected) 250.66 table 250.66 250.64(b)

The rating of the overcurrent protection of a piece of equipment is 100 amps. What is the minimum size copper equipment grounding conductor for grounding raceway and equipment?

8 AWG 250.122. Table 250.122

In general, what is the minimum size copper grounding electrode conductor allowed for a direct-current system consisting of a 3- wire balancer set?

8 AWG 250.166(A)

Conductors_____AWG and larger shall be stranded when installed in raceways.

8 AWG 310.106(C)

Where NM-B Cable is run at angles with joists in unfinished basements, it shall be permissible to secure cables not smaller than two 6 AWG or three______AWG conductors directly to the lower edges of the joists.

8 AWG 334.15(C)

The total marked rating of a cord- and attachment-plug- connected room air conditioner shall not exceed percent of the rating of a branch circuit where no other loads areod supplied.

80% 440.62(b)

The exposed surface of space heaters used to prevent condensation within motors in a Class I, Division 2 location shall not exceed % of the autoignition temperature of the gas or vapor involved.

80% 501.125(B)

Conductors of type NM-B cable shall be rated at_________C.

90°C 334.112

Do the minimum cover requirements for direct-buried conduit apply to cables or conduits located under a building?

No 300.5(A), Table 300.5

Are boxes located in elevated floors of show windows required to be designed as floor boxes when the authority having jurisdiction judges them to be free from physical damage?

No 314.27(B) Ex.

Are FCC systems permitted in a hospital?

No 324.12(4)

Is Flat Conductor Cable, Type FCC, permitted for use in schools?

No 324.12(4)

Can type NM-B cable be installed in the fourth floor of a multifamily dwelling that is a Type I construction?

No 334.10(2)

Is NM-B cable required to be supported where fished between access points through concealed spaces in finished buildings?

No 334.30(B)(1)

May type UF cable be installed in a storage battery room?

No 340.12(5)

Is Flexible Metal Conduit permitted to be used in a storage-battery room?

No 348.12(3)

Is type THWN conductor insulation permitted be used with a resistor?

No 470.4 not less than 90° rating, Table 310.104 (A)

Is type NM-B cable allowed in a Class II, Division 2 location?

No 502.10(B)(1)

Is type NM-B cable allowed as a wiring method in a poultry barn?

No 547.1(A) & (B), 547.5(A), 334.12(B)

Is the 8 AWG or larger solid copper bonding conductor for pool equipment required to extend to any remote panelboard, service equipment or electrode?

No 680.26(B)

May a 2-inch Liquidtight Flexible Mctal Conduit be used as a grounding means for a 30 amp circuit when terminated in fittings listed for grounding?

No, must be 20 amps or less 250.118a,b

Which table is fixed appliance loads

Table 220.53

Which table has electric clothes dryer

Table 220.54

Which table has household ranges, wall mounted ovens, and cooktops.

Table 220.55

What is the full load current of a 25 HP, three-phase, 208-volt squirrel-cage motor?

Table 430.250 74.8 amps

Overcurrent protection shall be provided in accordance with for transformers 1000 volts, nominal, or less.

Table 450.3 (B) 450.3(B)

A paint spray booth falls under the classification of Class Division

Class 1, Division 1 500.5(B)(1) informational note 1(2)

Transformers, other than Classor Class transformers, shall have a disconnecting means located either in sight of the transformer or in a remote location.

Class 2 or 450.14 Class 3

A wood shop is classified as a Class Division location.

Class 3, Division 1 500.5(D)(1) informational note no. 1

A grounding autotransformer must be provided with a system that causes the opening of a main switch or common-trip overcurrent device for the 3-phase, 4-wire system to guard against single-phasing or internal faults.

fault-sensing 450.5(A)(3) system

Where portions of an interior raceway system are exposed to widely different temperatures, the raceway shall be with an approved material to prevent the circulation of warm air to a colder section of the raceway.

filled 300.7(A)

Where subject to physical damage, fixed electric space-heating equipment shall be protected in an manner.

approved 424.12(A)

The disconnecting means for an x-ray machine shall be operable from a location from the x-ray control.

readily 660.5, accessible 517.72(B)

In general, the disconnecting means for an air conditioner or refrigerating equipment shall be located within sight from and be

readily accessible 400.14

Appliances that require GFCI protection shall have the GFCI protection device in a location.

readily accessible 422.5

In a pull box. the distance between raceway entries enclosing the same conductor shall not be less than_____times the trade diameter of the larger raceway.

six times 314.28(A)(2)

Switches and circuit breakers used as disconnecting means shall be of the type.

indicating 422.35

A motor disconnecting means shall be located the motor location and the driven machinery location.

in sight from 430.102(B)(1)

The connector or clamp by which the Type AC cable is fastened to boxes or cabinets shall be of such design that the__________or__________its equivalent will be visible for inspection.

insulating bushing 320.40

A manufactured non-metallic box with an_____means provided between all entries shall be permitted to be used with metal raceways.

internal bonding 314.3 ex 1

What is the minimum size THHN copper conductors, terminated on 75°C lugs, required for a single-phase, 230-volt, 12 HP motor?

10 amps x 125% 12.5 amps 14 AWG THHN copper conductors table 430.248 430.22, Table 310.15(b)16 75 degree

FCC assemblies can be installed under carpet squares no larger than_____meter square.

1 meter 324.41

Liquidtight Flexible Metal Conduit smaller than trade size______inch is allowed in hoistways as permitted in 620.21 (A)(1) for enclosing the leads of motors.

1/2-inch 350.20(A) Ex., 348.20(A)(4)

minimum trade size PVC Conduit is______inch.

1/2-inch 352.20(A)

The disconnecting means for motor circuits rated 600 volts nominal or less shall have an ampere rating of percent of the full-load current rating of the motor.

115% 430.110(A)

Embedded de-icing panels or units shall not exceed watts per square foot of heated area.

120 watts 426.20(A)

Each continuous-duty motor rated more than 1 horsepower and marked with a service factor not less than 1.15 shall be protected against overload by a separate overload device rated at no more than percent of the motor nameplate full- load current rating.

125% 430.32(A)&(1)

An autotransformer with a rated input current of less than 9 amps permits the use of an overcurrent device rated at not more than percent of the input current.

167% 450.4(A) Ex.

The minimum conductor size of Metal-Clad Cable (Type MC) is_____AWG copper.

18 AWG 330.104

A metal elbow that is installed in an underground installation of nonmetallic conduit and is isolated from possible contact by a minimum cover of_____inches to any part of the elbow shall not be required to be grounded.

18 inches 250.80 Ex.

A blue lead in an electric space-heating cable indicates that the. voltage is volts.

208 volts 424.35(2)

Overhead 120/240-volt service conductors supported on a solidly grounded bare messenger must have a clearance of feet over a swimming pool.

22.5 feet 680.8(A)

Type FCC assemblies shall be clearly and durably marked on both sides at intervals of not more than_______inches.

24 inches 324.120(A)

What is the maximum voltage allowed for a vented alkaline- type battery in any one tray?

24 volts 480.7(B)

Each transformer shall be provided with a nameplate giving the name of the manufacturer, rated kilo volt-amperes; frequency; primary and secondary voltage; required clearances; the amount and kind of insulating liquid where used, and impedance of transformers kVA and larger.

25 kVA 450.11

Askarel-insulated transformers installed indoors and rated over kVA shall be furnished with a pressure-relief vent.

25 kVA 450.25

The maximum operating temperature of type TFE conductors is ____ °C.

250°C Table 310.104 (A)

Capacitors containing more than gallons of flammable liquid shall be enclosed in vaults or outdoor fenced enclosures complying with Article 110, Part III.

3 gallons 460.2(A)

The walls and roofs of transformer vaults shall be constructed of materials that have adequate structural strength for the conditions with a minimum fire resistance of hours.

3 hours 450.42

Generally, each doorway leading into a vault from the building interior shall be provided with a tight-fitting door having a minimum fire rating of hours.

3 hours 450.43

Where Rigid Metal Conduit is threaded in the field, a standard cutting die with a________inch taper per foot shall be used.

3/4 344.28

Liquidtight Flexible Metal Conduit used as a grounding means for equipment where flexibility is not required and fed by a 60-amp circuit must be at least trade size______inch.

3/4-inch 350.60, 250.118(6) c

What is the minimum trade size Flexible Metal Conduit used for manufactured wiring systems as permitted in Section 604.6(A)?

3/8-inch 348.20(A)(3)

How many 12 AWG conductors can be installed in a 3/4" Flexible Metal Conduit?

4 (3 insulated + 1 equipment ground) table 348.22 * below table

Class locations are those that are hazardous because of the presence of easily ignitable fibers or where materials producing combustible flyings are handled, manufactured, or used, but in which such fibers/flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures.

Class III 500.5(D)

The pit area of a commercial garage where ventilation is not provided, shall be classified a Class I, Division up to the floor level.

Division 1 511.3(C)(3)(b)

In a major repair garage, the pit area shall be classified a Class I Division location where there is mechanical ventilation providing a minimum of six air changes per hour.

Division 2 511.3(C)(3)(a)

Where does a raceway providing communication from an enclosure in an unclassified location to a Class II Division I panelboard need to be sealed?

It does not need to be sealed. 502.15

What is the maximum distance an electrical cabinet mounted in a wooden wall may be set back from the finished surface?

Must be flush. 312.3

45. Can the structural metal frame of a building be used as the required equipment grounding conductor for AC equipment secured to grounded metal supports?

No 250.136(A)

Are standard locknuts an acceptable means for bonding service equipment?

No 250.92(B)

Is Liquidtight Flexible Metal Conduit allowed above a hung ceiling used for environmental air-handling purposes?

No 300.22(C)(1)

Is gas piping allowed in a cable tray with electrical conductors?

No 300.8

A main service is fed by two parallel runs of two ungrounded 3/O AWG copper conductors and a 1/0 AWG copper neutral. What size copper grounding electrode conductor to a water pipe is needed?

The equivalent area is 167800 x = 335,600 kcmil = 2 AWG 250.66 table 250.66 table 8 ch. 9

What size copper main grounding electrode conductor, connected to a water pipe, is required for a service fed with 2 parallel runs of 500 kemil XHHW aluminum?

The equivalent area is 500 x 2 = 1000 kcmil 1000 kemil = 2/0 AWG copper250.66 table 250.66

Is Type NM-B cable allowed in a single family dwelling exceeding three floors above grade?

Yes 334.10(1)

Boxes, conduit bodies, and hand hole enclosures shall be so installed that the wiring contained in them can be rendered

accessible 314.29

Hydromassage bathtub electrical equipment shall be without damaging the building structure or building finish.

accessible 680.73

Fixed electric heating equipment for pipelines and vessels shall be considered load.

continuous 427.4

Any room or location in a health care facility in which flammable anesthetics or volatile flammable disinfecting agents are stored shall be considered to be a Class 1 Division 1 location from floor to

ceiling 517.60(A)(2)

Single-speed motors starting on wye connection and running on delta connections shall be marked with a corresponding to the locked-rotor kVA per horsepower for the wye connection.

code letter 430.7(B)(2)

Class II locations are those that are hazardous because the presence of

combustible dust 500.5(C)

underwater luminaires operating at more than the low voltage A GFCI shall be installed in the branch circuit supplying such that there is no shock hazard during relamping.

contact limit 680.23(A)(3)

The cover plates for the electrical receptacles or the electrical receptacles themselves supplied from the emergency system of a health care facility shall have a color or marking so as to be readily identifiable.

distinctive 517.30(E)

The size of the equipment grounding conductor for a motor protected by an instantaneous-trip circuit breaker shall be based on the maximum permitted rating of a fuse selected for branch-circuit short-circuit and ground- fault protection in accordance with 430.52(C )(1) Ex. I.

dual element time-delay fuse 250.122d2

The connection of a grounding electrode conductor shall be made in a manner that will ensure an_____grounding path.

effective 250.68(B)

A motor overload unit for a single-phase motor fed from an ungrounded 2-wire, single-phase AC source may be installed in conductor.

either 430.37 Table 430.37

Expansion fittings and telescoping sections of metal raceways shall be made electrically continuous by or other means.

equipment 250.98 bonding jumpers

In a hospital electrical emergency system, the branch shall only supply power for illumination of means of egress, exit signs, alarm systems, communication systems, generator set location, elevators, and automatic doors.

life safety 517.32 (A) Through (H)

Luminaires installed in agricultural buildings that are exposed to water from condensation, building cleansing water, or solution shall be as suitable for use in wet locations.

listed 547.8(C)

A separate disconnecting means is not required for a capacitor connected on the side of a motor controller.

load 460.8(C) Ex.

Where a transformer or other device is used to obtain a reduced voltage for the motor control circuit and is located in the controller enclosure, such transformer or other device shall be connected to the side of the disconnecting means for the motor control circuit.

load side 430.75(B)

Where top terminal batteries are installed on tiered racks, working space in accordance with the battery shall be provided between the highest point on a cell and the row or ceiling above that point.

manufacturer's instructions 480.9(d)

A motor controller other than inverse time circuit breakers and molded case switches, shall have a horsepower rating at the application voltage not lower than the horsepower rating of the

motor 430.83(A)(1)

A no-niche luminaire, where connection to a forming shell is specified, shall be connected ro the

mounting 680.23(D) bracket

Where the current rating of a motor is used to determine the ampacity of conductors or ampere ratings of switches, branch- circuit, short-circuit and ground-fault protection, etc., the values given in Tables 430.247 through 250, including notes, shall be used instead of the actual current rating marked on the motor

nameplate 430.6(A)(1)

A listed exposed work cover shall be permitted to be the grounding and bonding means when the device is attached to the cover with at least fasteners that are permanent or have a thread locking or screw or nut locking means and are located on a flat non-raised portion of the cover.

two 250.146(A)

Crossings of more than______type FCC assemblies runs shall not be permitted at any one point.

two 324.18

In general care areas, each patient bed location shall be supplied by at least branch circuits.

two 517.18(A)

Where used at a point on a circuit, a surge arrester shall be connected to cach conductor.

ungrounded 280.3

Temperature controlled switching devices for fixed heating equipment for pipelines that do not have an off position shall not be required to open all conductors and shall not be permitted to serve as the disconnecting means.

ungrounded 427.56(B)

An overcurrent device shall be provided in each conductor for each capacitor bank.

ungrounded 460.8(B)

When is it permissible for an overload device to be eliminated from a motor circuit? ll a

when it is connected to a supervised alarm 430.44

Where can Liquidtight Flexible Metal Conduit be supported at intervals greater than 6 feet?

where fished 350.30(A) Ex.1

What color are the leads for a 120-volt nominal heating cable?

yellow 424.35(1)

In general, Rigid Metal Conduit smaller than trade size_______inch shall not be used.

½ inch 344.20(A)

Holes bored in studs through which nonmetallic sheathed cable is pulled must be at least inches from the edge of the stud unless steel-plate protection is provided.

1 4 inches 300.4(A)(1)

On circuits of 1 kV and over the rating of a silicon carbide-type surge arrester shall be not less than percent of the maximum continuous phase-to-ground voltage available at the point of application.

125% 280.4(B)

On live-front switchboards containing instruments. meters and relays. mats of insulating rubber or other suitable floor insulation shall be provided for the operator where the voltage to ground exceeds

150 250.174(C)

Underground service conductors that are not encased in concrete and that are buried inches or more below grade shall have their location identified by a warning ribbon that is placed in the trench at least 12 inches above the underground installation.

18 inches 300.5(D)(3)

A ground ring is a grounding electrode that encircles the building or structure, in direct contact with the earth, consisting of at least______feet of bare copper conductor not smaller than 2 AWG.

20 fect 250.52(A)(4)

A concrete-encased electrode shall consist of a minimum of feet______of bare copper conductor not smaller than 4 AWG.

20 feet 250.52(A)(3)

In general. direct-burial cable rated above____volts shall be shielded.

2000 volts 310.10(E)

Double locknuts are required where rigid metal raceways. in other than service runs, enter a box or cabinet, if the raceway contains any wire of more than volts to ground and concentric knockouts are not encountered.

250 volts 250.97 ex.2

A_____AWG or larger copper or aluminum grounding electrode conductor shall be protected if exposed to physical damage.

4 AWG 250.64(B)

Where connected to a concrete-encased electrode as in 250.52 (A)(3), that portion of the grounding electrode conductor that is the sole connection to the grounding electrode in a grounded ac system shall not be required to be larger than,_____AWG copper wire.

4 AWG 250.66(B)

What is the minimum burial depth required for Rigid Metal Conduit under a 4 inch exterior slab?

4 inches 300.5(A). Table 300.5

How many items does the NEC list that determine the operating temperatures of conductors?

4 items 310.15(A)(3) Informational Note no. 1

In an ungrounded ac system, that portion of the grounding electrode conductor that is the sole connection to single or multiple ground rods shall not be required to be larger than______AWG copper wire.

6 AWG 250.66(A)

The largest copper grounding electrode conductor required to be run to single or multiple plate clectrodes for a grounded ac system is _____AWG.

6 AWG 250.66(A)

The conductor between a surge arrester and the line and the surge arrester and the grounding connection for installations operating at 1000 volts or more, shall not be smaller than AWG G copper.

6 AWG 280.23

Type UF cable used for 24-volt landscape lighting circuits must have a minimum cover of inches when not installed in a raceway.

6 inches 300.5(A). Table 300.5

What is the minimum 90 degree wire-bending space required for (2) 4/0 conductors installed in parallel to the same terminal in a cabinet?

6 inches 312.6(B)(1) Table 312.6(A)

Direct buried conductors and cables rated less than 600 volts that emerge from the ground shall be protected by enclosures or raceways extending from the minimum cover distance required by Section 300.5(A) below grade to a point at least feet above finished grade.

8 feet 300.5 (D)(1)

What is the maximum size 120/240-volt, single-phase service rating for a dwelling unit fed with 2 AWG aluminum SER, terminated on 75°C lugs?

90 amps + .83 = 108.4 amps = 100 amp service

All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be

accessible 250.68(A)

Where a single equipment grounding conductor is run with multiple circuits in the same raceway, it shall be sized for the overcurrent device protecting conductors in the raceway or cable.

largest 250.122(C)

A junction box installed under metal-corrugated sheet metal roof decking shall be installed and supported so there is not less than inches measured form the lowest surface of the roof decking to the top of the junction box.

1 ½ inches 300.4(E)

Where installed in two or more raceways, the size of the ounded conductor in each raceway shall be based on the size of the ungrounded service-entrance conductor in the raceway but not smaller than____AWG.

1/0 AWG 250.24(C)(2)

Aluminum, copper-clad aluminum, or copper conductors for each phase. polarity, neutral. or grounded circuit, shall be permitted to be connected in parallel (electrically joined at both ends) only in sizes____AWG and larger.

1/0 AWG 310.10(H)(1)

A meatal underground water pipe is permitted as a grounding electrode where in direct contact with the earth for____feet or more

10 feet 250.52(A)(1)

When service entrance conductors exceed 1100 kcmil for copper, the main bonding jumper must be at least_____% of the largest phase conductor.

122% 250.28(D)(1), Table 250 102(C)(1) and Note 1

The maximum allowable ampacity of a single 1/0 THW copper conductor, installed in free air in an ambient temperature of 50 C. shall be amps.

230A x .75 = Table 310.15 72.5Aו (B)(17) and Ampacity Correction Factor from Table 310.15 (В /2)(а)

Multiconductor cables not installed in raceways and installed without maintaining spacing for a continuous length longer than____inches without maintaining spacing shall have the ampacity of the conductors reduced.

24 310.15 (B)(3)(a) Adjustment Factors

If a single rod, pipe, or plate grounding electrode has a resistance to earth of_____ohms or less, the supplemental electrode shall not be required.

25 ohms 250.53(A)(2) Ex.

The equipment bonding jumper on the load side of an overcurrent device shall be sized in accordance with

250.122 250.102(D)

Where raceways contain AWG or larger insulated circuit conductors, and those conductors enter a cabinet, a box, an enclosure, or a raceway, the conductors shall be protected by an identified fitting providing a smoothly rounded insulating surface, unless the conductors are separated from the fitting or raceway by identified insulating material that is securely fastened in place.

4 AWG 312.6(C). 300.4 (G)

An equipment bonding jumper is permitted outside a raceway when not over feet long and routed with the raceway or enclosure.

6 feet 250.102(E)(2)

When buried in a trench below 2-inch thick concrete, intermediate metal conduit shall be covered inches from the top.

6 inches 300.5(A). Table 300.5

Exposed normally noncurrent-carrying metal parts of fixed equipment supplied by or enclosing conductors or components that are likely to become energized shall be connected to an equipment grounding conductor where within feet vertically or 5 feet horizontally of ground or grounded metal objects and subject to contact by persons.

8 feet 250.110(1)

A connection to a concrete-encased, driven, or buried grounding electrode need not be

accessible 250.68(A) Ex. No. 1

No wiring systems of_________type shall be installed in ducts used any to transport dust, loose stock, or flammable vapors.

any 300.22(A)

An shall be used to connect the grounding terminal of a grounding-type receptacle to a grounded box unless grounded as in 250.146(A) through (D).

equipment bonding jumper 250.146

Where a main bonding jumper is a screw only, the screw shall be identified with a_______finish that shall be visible with the screw installed.

green 250.28(B)

The grounded circuit conductor for an electrical service installed a single raceway shall not be smaller than the required______conductor specified in Table 250.102(C)(1) but shall not be required to be larger than the largest ungrounded service entrance conductor.

grounding electrode 250.24

In a high-impedance grounded neutral system. the grounded system conductor. from the neutral point of the transformer or generator to its connection point to the grounding impedance shall be fully

insulated 250.36(B)

44. Where conductors are installed in parallel in multiple raceways or cables, as permitted in Section 310.10 (4). the equipment grounding conductors, where used, shall be installed in in each raceway or cable.

parallel 250.122(F)

Rod-type grounding electrodes of stainless steel and copper or zinc coated steel shall be at least_____inch in diameter, unless listed.

$/s inch 250.52 (A)(5)(b)

For permanently connected appliances rated at not over 300 volt-amperes or horsepower, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means.

% HP 422.31 (A)

For stationary motors of horsepower or less, the branch-circuit overcurrent device shall be permitted to serve as the disconnecting means.

% HP 430.109(B)

Reference 430.81(A) branch-circuit serve as the The controller shall be permitted to be an attachment plug and receptacle or cord connector for a portable motor rated at HP or less.

% HP 430.81(B)

What size 120/240-volt, single-phase service is required for a 3,000 square foot dwelling unit with the following loads: (1) 12 kW Range (1) 4.5 kW Dryer (1) 1.2 kVA Dishwasher (1) .8 kVA Compactor

1. General Lighting and Receptacle Demand Load 3000 ft'x 3 VA = 9,000 VA 1500 VAx 2 = 3,000 VA A 220.52(A) 1500 VAX 1 = 1,500 VA Total calculated load 13,500 VA 3000 VAx 100% = t 3,000 VÀ 10500 VAx 35% = 3.675 VAi 6,675 VA table 220.12, 220.52(a)&(b) table 220.42 Range Demand Load 12 kW Range = 8kw table 220.55 Dryer load 4.5 kva dryer = 5kva table 220.54 Fixed appliance load Dishwasher 1.2kva +.8kva = 2.0kva 220.53 Heating A/C load N/a 25% of largest motor Compactor .8 kva x 25% = .2kva 220.50 430.24 Total service load Total sum of kva x 1000 = 21,875 va 21,875va/240v = 91.1 amp 230.42(B) 230.79(C) Answer: 100A 240.6

What size copper conductors are required for the above service for the following: 1. main service grounding electrode conductor connected to a metal water pipe, 2. grounding electrode conductor to a supplemental made electrode 3. equipment bonding jumper on supply side of service

1. main service ground = 8 AWG copper 2. made electrode = 8 AWG copper 3. equipment bonding jumper on supply side of service = 8 AWG copper Answer 8AWG copper each 250.66 table 250.66(a) 250.53(D)2 table 250.102(c)(1)

The most common nominal cell voltage for an alkali-type battery is volts per cell.

1.2 volts Definitions nominal voltage (Battery or Cell) 480.2 informational note

Horsepower-rated attachment plugs, flanged surface inlets, receptacles, or cord connectors shall not be required for portable motors rated hp or less.

1/3hp 430.109(F)

Where nails are used as a fastening means and pass through the interior of an enclosure box, the nails shall not be permitted to be more than______inch from the back of the enclosure.

1/4 inch 314.23(B)(1)

Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than_____inches at the edge of the cabinet or cutout box employing a flush-type cover.

1/8 312.4

The minimum size of copper equipment grounding conductor required for equipment connected to a 40-amp circuit is AWG.

10 AWG 250.122, Table 250.122

The largest conductor permitted in 3/8 - inch Flexible Metal Conduit is_______AWG.

10 AWG 348.22, Table 348.22

An equipment bonding jumper, not smaller than AWG, shall be used to connect the grounding terminal of all grounding-type receptacles to the patient equipment grounding point located, where supplied, in a critical care area.

10 AWG 517.19(D)

In manufactured buildings, cables installed in closed construction shall be permitted to be secured only at cabinets, boxes, or fittings where. AWG or smaller conductors are used and protection against physical damage is provided.

10 AWG 545.4(B)

An oil switch may be used on a motor circuit as both controller and disconnect if the rating does not exceed 1000 volts or AMPS

100 430.111(B)(3) amperes

What are the minimum size THHN copper ungrounded service conductors allowed for the previous question, and what is the minimum trade size EMT allowed to contain two ungrounded and one grounded service conductor of the same size?

100 amps x .83 = 83 amps 83 amps = 4 AWG THHN Copper (3) 4 AWG THHN conductors -1in EMT 310.15(B)16 Annex C; table C1

Threaded boxes and fittings which are threaded into two or more properly supported conduits from two or more sides and do not support fixtures or contain devices need not be further secured, provided their volume does not exceed______inches cubed

100 inches cubed 314.23(E)

In general, individual dry-type transformers of more than kVA rating shall be installed in a transformer room of fire-resistant construction.rye

112% kVA 450.21 (B)

The disconnecting means for a hermetic refrigerant motor- compressor shall have an ampere rating of at least percent of the nameplate rated load current or branch-circuit selection current, whichever is greater.

115% 440.12(A)(1)

The ampacity of the phase conductors from the generator terminals to the first overcurrent device shall not be less than percent of the nameplate current rating of the generator.

115% 445.13

The ampere rating of the disconnecting means for a phase converter shall not be less than percent of the rated maximum single-phase input full-load amperes.

115% 455.8(C)

What is the minimum burial depth for a 120-volt, 20 amp circuit installed for residential landscape lighting and protected by a GFCI device?

12 inches 300.5(A). Table 300.5

MC cables containing four or fewer conductors, sized no larger than 10 AWG, shall be secured within______inches of every box. cabinet, fitting, or other cable termination.

12 inches 330.30(B)

Nonmetallic-sheathed cable shall be secured in place at intervals not exceeding 4 ½ feet and within inches from every cabinet, box, or fitting.

12 inches 334.30

In general, dry-type transformers installed indoors and rated 1122 kVA or less shall have a separation of at least, inches from combustible material.

12 inches 450.21(A)

In general, dry-type transformers installed outdoors and exceeding 112½ kVA shall not be located within inches of combustible materials of buildings.

12 inches 450.22

Resistors and reactors rated over 1000 volts, nominal, shall not be installed in close enough proximity to combustible materials to constitute a fire hazard and shall have a clearance of not less than inches from combustible materials.

12 inches 470.18(C)

A 1000-volt resistor shall require a thermal barrier if the space between resistors and reactors is installed closer than inches to combustible material.

12 inches 470.3

Pendant lighting fixtures with rigid conduit stems more than inches long must be braced when run in Class 1, Division 1 locations.

12 inches 501.130(A)(3)

Conductors supplying several motors, or a motor(s) and other load(s), shall have an ampacity not less than. percent of the full-load current rating of the highest rated motor plus the sum of the full-load current ratings of all the other motors in the group, plus 100 percent of the noncontinuous non-motor load and 125 percent of the continuous non-motor load.

125% 430.24

Branch-circuit conductors supplying a single motor-compressor shall have an ampacity not less than percent of either the motor-compressor rated load current or the branch-circuit selection current, whichever is greater.

125% 440.32

Each autotransformer 1000 volts, nominal, or less, shall be protected by an individual overcurrent device on the primary side, rated or set at not more than percent of the rated primary current of the transformer.

125% 450.4(A)

When an autotransformer is used to create a 3-phase, 4-wire distribution system from a 3-phase, 3-wire ungrounded system, an overcurrent sensing device shall be provided that will cause the main switch to open when the load on the autotransformer exceeds %.

125% 450.5(A)(2)

The ampacity of the single-phase supply conductors that supply variable loads shall not be less than percent of the phase converter nameplate single-phase input full-load amperes.

125% 455.6(A)(1)

Fixed loads supplied by a single-phase converter shall be protected from overcurrent by an overcurrent device that does not exceed % of the phase converter nameplate single- phase input amperes.

125% 455.7(B)

The branch-circuit conductors supplying one or more units of information technology equipment shall have an ampacity of not less than percent of the total connected load.

125% 645.5(A)

Branch circuit conductors feeding a center pivot irrigation machine under continuous use shall be equal to percent of the motor nameplate full-load current rating of the largest motor plus 60 percent of the sum of the motor nameplate full-load circuit ratings of all remaining motors on the circuit.

125%o 675.22(A)

If a 3-inch Rigid Metal Conduit is field bent with a one-shot bender, the distance between the radius to the center of the conduit shall not be less than_____inches.

13 inches 344.24, table 2 ch. 9

A GFCI shall be installed in the branch circuit supplying fountain equipment operating at more than volts RMS ac

15 680.51(A) 680.2 - Low Voltage Contact Limit

Amusement rides or attractions shall not be located under or within feet horizontally of conductors operating in excess of 600 volts.

15 feet 525.5(B)(2)

A boiler employing resistance-type immersion heating elements contained in an ASME rated and stamped vessel shall have the heating elements protected at not more than amperes.

150 amperes 424.72(A)

Voltage between ungrounded conductors and grounded conductors shall not exceed________volts in type FCC assemblies.

150 volts 324.10(B)(1)

The circuit supplying an autotransformer-type dimmer installed in theaters shall not exceed volts between conductors.

150 volts 520.25(C)

What is the maximum voltage between conductors allowed for underwater pool luminaires?

150 volts 680.23(A)(4)

In one- and two-family dwellings, live parts in photovoltaic source circuits and photovoltaic output circuits over volts to ground shall not be accessible while energized to other than qualified persons.

150 volts 690.7(D)

Constant wattage heating cable installed in concrete or poured masonry floors shall not exceed watts per linear foot of cable.

16 2 watts 424.44(A)

Generally, heating cables installed on a plaster ceiling must be supported at intervals not exceeding inches.

16 inches 424.41(F)

For stationary motors rated at HP or less and 300 volts or less, the disconnecting means shall be permitted to be a general use switch having an ampere rating not less than twice the full- load current rating of the motor.

2 HP 430.109(C)(1)

by at least Each patient bed location in critical care areas shall be supplied branch circuits.

2 branch circuits 517.19(A)

Flexible Metallic Tubing may be used as a grounding means when the conductors therein are protected by an overcurrent device rated at not more than amps, the length does not exceed 6 feet, and it is terminated in fittings listed for grounding.

20 amps 250.118(7)(a) (b)

Straight runs of 3-inch Rigid Metal Conduit must be supported every____feet.

20 feet 344.30(B)(2). Table 344.30 B (2)

Where a permanently-installed pool is installed at a dwelling unit, at least one 125-volt receptacle shall be located a minimum of 6 feet from and not more than feet from the inside wall of the pool.

20 feet 680.22(A)(1)

Lighting systems operating at 30 volts or less shall be supplied from a maximum -ampere branch circuit.

20-ampere 411.7

Where the opening to an outlet, junction, or switch point is less than 8 inches in any dimension. each conductor shall be long enough to extend at least inches outside the opening.

3 inches 300.14

What size square junction box is required for (3) 3-inch conduits feeding straight through the box containing conductors larger than 4 AWG?

3-inch x 8 = 24" 24" x 24" Junction box 314.28 A(1)

What is the maximum size copper grounding electrode conductor connected to building steel required for (4) parallel runs of (4) 500 kcmil copper conductors?

3/0 AWG copper 250.66 Table 250.66

Where rock bottom is encountered. be buried if the trench is at least____inches deep. ground rods are permitted to

30 inches 250.53(G)

A two-wire. de system supplying premises wiring and operating at greater than 50 volts but not greater than volts shall be grounded.

300 volts 250.1621A)

What is the maximum voltage between conductors allowed for a submersible pump located in a decorative fountain?

300 volts 680.51(B)

The ampacity of 1750 kcmil Type IGS is_______amps.

315 amps 326.80. Table 326.80

nlems o aed Type SPT-3 cord used on a kitchen waste disposal is limited to 36 not more than inches in length.

36 inches 422.16 (B)(1)(2)

For a stationary motor rated at HP or less that is damaged by overload or failure to start, the branch-circuit normally left running and is constructed so that it cannot be disconnecting means shall be permitted to serve as the controller.

4 HP 430.81(A)

Flexible metal conduit shall be permitted, in lengths not to exceed_________feet, to connect physically adjustable equipment and devices permitted to be in ducts and plenum chambers used for environmental air.

4 feet 300.22(B)

The maximum length of a trash compactor cord is feet.

4 feet 422.16 (B)(2)(2)

Heat pumps having duct heaters closer than feet to the heat pump shall have both the heat pump and duct heater approved for such installation.

4 feet 424.61

Plate electrodes of iron or steel shall be at least_____inch in thickness.

4 inch 250.52(A)(7)

The front of an outlet box which is installed in a noncombustible ceiling may be no more than_____inch back from the surface.

4 inch 314.20

In an approved transformer vault, the height of the door sill or curb shall be no less than inches.

4 inches 450.43(B)

AC cable must be supported at intervals not exceeding_______feet except where fished between access points through concealed spaces in finished buildings or structures, and at connections to luminaires within accessible ceilings,

4 ½ feet 320.30(C)(D)

A code letter D is marked on a motor nameplate. What is its locked-rotor kVA per horsepower?

4.0 - 4.49 kVA 430.7(B) Table 430.7(B)

A mobile home that is factory-equipped with gas or oil-fired central heating equipment and cooking appliances shall be permitted to be provided with a listed mobile home power- supply cord rated amperes.

40 amperes 550.10(A) Ex. 1

A motor branch circuit short-circuit protective device consisting of a nontime-delay fuse not exceeding 600 amps shall never have a rating in excess of percent of the full-load motor current. circuit transformer

400% 430. 52(C)(1) Ex. No. 2(a)

Plug-in type back-fed circuit breakers connected to a stand-alone or multimode inverter output in stand-alone PV systems shall be secured in accordance with

408.36(D) 690.10(E)

Any wiring behind heating panels or heating panel sets located in interior walls or partitions shall be considered as operating in an ambient temperature of °C, and the ampacity shall be computed on the basis of the correction factors given in the 0-2000 volt ampacity tables of Article 310.n

40°C 424.95(B)

Flexible Metal Conduit shall be securely fastened in place by an approved means within 12 inches of each box, cabinet.conduit body, or other conduit termination, and shall be supported and secured at intervals not to exceed________fect.

42 feet 348.30(A)

A permanently installed above ground pool is one which is constructed in the ground or partially in the ground and is capable of holding water to a depth greater than. inches.

42 inches 680.2

If a switch or circuit breaker serves as the disconnecting means for a permanently connected motor-driven appliance of more than % horsepower, it shall be located the appliance.

422.31 (C)(1) within sigh: from

inches from the edge of outlet boxes used to mount surface The heating elements of cables shall be separated at least lighting fixtures.

424.39 8 inches

lead at the splice shall be embedded in plaster or dry board in nonheating leads, ainch minimum length of the nonheating In all heating cables, in the splice between the heating cable and the same manner as the heating cable.

424.41(D) 3 inch

May an ac general-use switch be used to control a motor rated at 2 HP or less and 300 volts or less, provided the FLC does not exceed one-half the ampere rating of the switch?

430.83(C)(1)

transformer rated 1000 volts and below shall be as required in The minimum wire bending space for fixed terminals in a

450.12 312.6

Electric heating appliances employing resistance-type heating elements rated more than amperes shall have the heating elements subdivided.

48 amperes 422.11(F)(1)

What is the allowable ampacity of a 30 AWG conductor rated at 75°C and used for a control relay in an amusement attraction?

5 amps 522.22 Table 522.22

Fastening of Rigid Metal Conduit within 3 feet of a junction box may be increased to a distance of______feet where structural members do not readily permit fastening within 3 fcet.

5 feet 344.30(A)(2)

Mobile aircraft battery charging equipment shall carry at least one permanently affixed warning sign warning to keep feet clear of aircraft engines and fuel tank areas.

5 feet 513.10(B)

Underground wiring shall not be permitted under an outdoor swimming pool or within the area extending feet horizontally from the inside wall of the pool unless the wiring is necessary to supply pool equipment.

5 feet 680.10

be located at least feet horizontally from the inside walls of located within sight from pool, spa, or hot A maintenance disconnecting means shall be readily accessible and tub equipment, and shall permanently installed barrier that provides a 5-foot reach path or the pool, spa, or hot tub unless separated from the open water by a greater.

5 feet 680.12

Existing luminaires and lighting outlets located over an indoor pool or within 5 feet from the inside walls of the pool shall be a minimum of rigidly attached to the existing structure, and shall be protected by a feet above the maximum water level, shall be GFCI.

5 feet 680.22(B)(3)

Metal sheathed cables and raceways, metal piping, and all fixed metal parts associated with spas or hot tubs shall be located a minimum of feet away from such units or be bonded to the spa or hot tub system.

5 feet 680.26(B)(7) Ex. 2

In other than single-family dwellings, a clearly labeled emergency shutoff or control switch for the purpose of stopping the motor(s) that provide power to the recirculation system and jet system shall be installed readily accessible to the users and at least feet away, adjacent to, and within sight of, the spa or hot tub.

5 feet 680.41

Wall switches for the control of spas or hot tubs installed indoors shall be located at least feet measured horizontally, from the inside walls of the spa or hot tub.

5 feet 680.43(C)

The radius of the curve of the inner edge of any bend of type AC cable shall not be less than______times the diameter.

5 times 320.24

The maximum radius of bends in MI cable with an external diameter of less than 3/4 inch shall be no less than______times the MI cable diameter.

5 times 332.24(1)

In other than residential occupancies, fixed infrared heating equipment shall be permitted to be supplied from branch circuits rated not over amperes.

50 amperes 424.3(A)

Infrared lamps for industrial heating appliances shall have overcurrent protection not exceeding amps.

50 amps 422.11(C)

Dry-type transformers 1000 volts, nominal, or less and notd hollow spaces of exceeding kVA shall be permitted in the fire-resistant buildings not permanently closed in by structure and provided they meet the ventilation requirements of Section 450.9.

50 kVA 450.13(B)

Exposed live parts of motors and controllers operating at volts or more between terminals shall be guarded against accidental contact.

50 volts 430.232 (1)(2)(3)

Live parts of generators operated at more than dvolts to ground shall not be exposed to accidental contact where accessible to unqualified persons.

50 volts 445.14

An intersystem bonding termination shall be provided at service and connected to the service equipment or disconnect by a equipment and disconnecting means for buildings and structures minimum____AWG copper conductor.

6 AWG copper 250.94(4)&(5)

Conductor free lengths shall be a minimum of inches long at switch outlets.

6 inches 300.14

The minimum depth for buried IMC outside of a building where not covered by concrete and not subject to vehicular traffic is inches.

6 inches 300.5(A), Table 300.5

Where NM-B passes through a floor and is protected from physical damage by Schedule 80 PVC, the conduit must extend at least________inches above tte floor.

6 inches 334.15(B)

The radius of the curve to the centerline of the bend in a 1 inch Liquidtight Flexible Metal Conduit shall not be less than____inches.

6 inches 350.24 Table 2 Chapter 9 "Other Bends"

Excess leads of heating cables shall not be cut, but shall be secured to the underside of the ceiling and embedded in plaster or other approved material, leaving only a length sufficient to reach the junction box with not less than, inches of free lead within the box.

6 inches 424.43(C)

Not less than inches of free nonheating lead for embedded deicing equipment shall be within the junction box.

6 inches 426.22(E)

Single conductor portable supply cable sets to portable stage switchboards shall be permitted to have the grounded conductor and the equipment grounding conductor identified by marking at least the first inches from both ends.

6 inches 520.53(H)(2)

Rigid Metal Conduit larger than trade size_______inch shall not be used

6. 344.20(B)

A household-type appliance with surface heating elements having a maximum demand of more than amperes computed in accordance with Table 220.55 shall have its power supply subdivided into two or more circuits, each of which is provided with overcurrent protection rated at not over 50 amperes.

60 amperes 422.11(B)

Circuits supplying primaries of isolating transformers shall operate at not more than volts between conductors.

600 517.160(A)(2)

In a health care facility location, the secondary voltage of an isolating transformer may not exceed volts.

600 volts 517.160(A)(2)

The ampacity of ty pe NM-B cable shall be that of________degrees C conductors.

60°C 334.80

Where Type SE service-entrance cable is installed indoors for branch circuits or feeders in thermal insulation, the ampacity shall be in accordance with the_______ °C conductor temperature rating.

60°C 338.10(B)(4)

Fixed electric space-heating equipment requiring supply conductors with over °C insulation shall be clearly and permanently marked.

60°C 424.11

Generators operating at volts or less and driven by individual motors shall be considered as protected by the overcurrent device protecting the motor if these devices will operate when the generators are delivering not more than 150 percent of their full-load rated current.

65 volts 445.12(C)

The collector ring used for grounding an electrically-driven irrigation machine shall have a current rating of not less than that sized in accordance with Section

675.11 (A) 675.11(C)

Decorative pools and fountains shall comply with Article

680 680.1

Electric space-heating cables shall be furnished complete with factory-assembled nonheating leads at least feet in length.

7 feet 424.34

Control circuit devices with screw-type pressure terminals used with 14 AWG or smaller copper conductors shall be torqued to a minimum of lb-in unless identified for a different torque value.

7 lbs./inch 430.9(C)

The minimum clearance between conductors supplying a 23 kV reactor installed indoors and a grounded surface is Linches.

7.5 inches 470.18(D), 490.24, Table 490.24

Where rigid nonmetallic conduit is used as a wiring method for wet-niche luminaires, a AWG insulated solid or stranded copper bonding jumper shall be installed in this conduit with provisions for terminating in the forming shell.

8 AWG 680.23 (B)(2)(b)

The minimum size equipotential bonding grid wire for a swimming pool shall be AWG.

8 AWG 680.26(B)

What is the ampacity of 16 AWG Type TC power and control tray cable?

8 amps 336.80, 402.5, Table 402.5

Rod and pipe grounding electrodes shall not be less than_____feet in length.

8 feet 250.52(A)(5)

Where a Flat Conductor Cable assembly is installed less than________feet above the floor or fixed working platform, it shall be protected by a cover identified for the use.

8 feet 322.10(3)

Branch circuits supplying only fixed lighting in anesthetizing locations shall be permitted to be supplied by a normal grounded service provided such luminaires are located at least feet, above the floor.

8 feet 517.63(C)(1)

Where NM-B cable is used with boxes no larger than a nominal size 214 inches by 4 inches, mounted in walls or ceilings and where the cable is fastened within________inches of the box measured along the sheath and where the sheath extends through a cable knockout no less than 1/4 inch, securing the cable to the box shall not be required.

8 inches 314.17(C) Ex.

Each patient bed located in general care areas of health care facilities shall be provided with a minimum of receptacles.

8 receptacles 517.18(B)

If a ground-fault circuit-interrupter is used to protect the secondary winding of the isolation transformer used for impedance heating in a driveway, what is the maximum voltage allowed?

80 volts 426.32

Photovoltaic systems with dc source circuits, de output circuits, or both, operating at a PV system maximum system voltage of volts or greater, shall be protected by a listed (dc) arc-fault circuit- interrupter, PV type, or other system components listed to provide equivalent protection.

80 volts 690.11

Where a general-use snap switch suitable only for use on ac is used as a controller for a stationary motor rated at 2 HP or less and 300 volts or less, the full load current rating for the motor must not exceed percent of the rating of the switch.

80% 430.83(C)(2)

The minimum field bend radius for 2-inch Rigid Metal Conduit bent inches with a one shot bending machine is____inches.

9 1/2 inches 344.24 table 2 ch. 9

connection with the Where none of the bonded parts is in direct pool water, the pool water shall be in direct contact with an approved corrosion-resistant conductive surface that exposes not less than in? of surface area to the pool water at all times.

9 in? 680.26(C)

Class locations are those in which flammable gasses, flammable liquid-produced vapors, or combustible liquid- produced vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures.

Class I 500.5(B)

Explosion proof equipment and wiring shall not be required and shall not be acceptable in Class locations unless also identified for such locations.

Class II 502.5

Electric drinking fountains shall be protected with protection.

GFCI 422.52

Outlets supplying pool pump motors connected to single-phase, 120-volt through 240-volt branch circuits, whether by receptacle or by direct connection, shall be provided with protection for personnel.

GFCI 680.21(C)

Receptacles and attachment plugs used within hazardous anesthetizing locations shall be listed for use in Class I Group hazardous locations and shall have provision for the connection of a grounding conductor.

Group C 517.61(A)(5)

A disconnecting means shall be provided to disconnect the power to all electronic equipment and all dedicated. systems in the information technology equipment room.

HVAC 645.10

Bends in Type MC cable with an interlocked-ty pe armor shall be made so that the radius of the curve of the inner edge of any edge of any bend is not less than_____times the extemal diameter of the metallic sheath.

Seven 330.24(B)

All luminaires used in therapeutic tub areas shall be of the type.

Totally 680.62(F) enclosed

Are conductors of ac and dc circuits rated 1000 volts nominal or less. permitted to occupy the equipment wiring enclosure, cable. or raceway?

Yes 300.3(C)(1)

Can type NM-B cable be used in a restaurant of Type II construction where installed within raceways permitted to be installed in Type II construction?

Yes 334.10(5)

Is listed Liquidtight Flexible Metal Conduit permitted in a concealed location?

Yes 350.10

Is Liquidtight Flexible Metal Conduit with listed fittings allowed for a motor termination in a Class I, Division 2 location?

Yes 501.10(B)(2)(4)

Is the grounded conductor required to be disconnected simultaneously with the ungrounded conductors suppiying a gasoline dispensing pump?

Yes 514.11(A)

Are flexible cables and cords approved for hard usage permitted to be laid on floors in places of assembly for trade shows where protected from contact by the general public?

Yes 518.3(B)

conductor sized in accordance with Table 250.122 allowed in a Is type AC cable containing an insulated equipment grounding place of assembly requiring fire-rated construction?

Yes 518.4(A)

The control for the disconnecting means for all electronic equipment and all dedicated HVAC systems in an information technology equipment room shall be grouped and identified. Is a single means permitted to control both systems?

Yes 645.10(A)(2)

Is rigid nonmetallic conduit allowed under a raised floor in a data processing room?

Yes 645.5(E)(2)

The metal bands or hoops used to secure wooden staves of hot tubs shall not be required to be as required in 680.26.

bonded 680.42(B)

All intervening raceways, fittings, boxes, enclosures, etc. between Class I Division 1 and 2 locations and the po nt of grounding for service equipment shall be bonded with

bonding jumpers 501.30(A)

Fixed outdoor electric de-icing and snow-melting equipment Tel shall be considered as a load.

continuous 426.4

All metal piping systems associated with a fountain shall be bonded to the of the branch circuit supplying the fountain.

equipment 680.53 grounding conductor

It shall be permitted to splice the grounding electrode conductor by means of irreversible compression-type connectors listed for the purpose or the________process.

exothermic welding 250.64.C(1)

Raceways shall be provided with fittings where necessary to compensate for thermal expansion and contraction.

expansion 300.7(B)

In a fountain, flexible cord immersed in or exposed to water shall be of a type for. usage, as designated in Table 400.4 and shall be a listed type with a "W" suffix.

extra-hard 680.56(B)

A shall be provided on the end(s) of conduit or tubing used to provide cable support or protection against physical damage.

fitting 300.15(c)

In walls and ceilings constructed of wood or other combustible material, boxes shall be________with the finished surface or project therefrom.

flush 314.20

In a health care facility, ground-fault protection for operation of the service and feeder disconnecting means shall be such that the feeder device, but not the service device, shall open on ground-faults on the load side of the feeder device.

fully selective 517.17(C)

Lamps in cellulose nitrate film storage vaults shall be installed in rigid fixtures of the glass-enclosed and type.

gasketed 530.51

Where the bonding of a generator is modified in the field, additional marking shall be required to indicate whether the generator neutral is bonded to the

generator frame 445.11

Branch-circuit conductors supplying fixed resistance heating element for pipelines (e.g., heating tape) are required to be protected.

ground-fault 427.22

Nonheating leads of fixed outdoor electric de-icing equipment having a or braid shall be permitted to be embedded in the masonry or asphalt in the same manner as the heating cable without additional physical protection.

grounding 426.22(A) sheath

A shall not be required where only a single branch circuit, including a multiwire branch circuit, supplies a separate building and the branch circuit includes an equipment grounding conductor.

grounding electrode 250.32A

Where can type NM-B cable be used in a place of assembly?

in areas not required to be fire rated by the applicable building code 518.4(B)

For a hermetic refrigerant motor-compressor, the rated-load current marked on the of the equipment in which the motor-compressor is employed shall be used to size the branch circuit conductors.

nameplate 440.6(A)

Separate motor overload protection shall be based on the motor rating.

nameplate current 430.6(A)(2)

Autotransformers shall have a continuous rating that is not less than the maximum possible neutral unbalanced load current of the 4-wire system.

neutral-current 450.5(A)(4)

A circuit is a circuit other than field wiring, in which any arc or thermal effect produced under intended operating conditions of the equipment, is not capable, under specified test conditions, of igniting the flammable gas-air, vapor-air, or dust-air mixture.

nonincendive circuit 500.2

Any inhalation anesthetizing location in a health care facility designated for the exclusive use of nonflammable anesthetizing agents shall be considered to be an location.

other-than- hazardous 517.60(A)(2)

If the appliance is provided with a manually operated, line- connected, single-pole switch for appliances on-off operation, an Edison-base lampholder, or a 15- or 20-ampere receptacle, the attachment plug shall be of the or grounding type.

polarized 422.40

The end of the flexible-cord jacket and the flexible-cord conductor terminations within a wet-niche luminaire shall be covered with, or encapsulated in, a suitable to prevent the entry of water into the luminaire through the cord or its conductors.

potting compounf 680.23(B)(4)

Leads of 240-volt electric space-heating cables are identified with the color

red 424.35(3)

Where a motor control center is used as service equipment, each motor control center shall be provided with a disconnecting means to disconnect all ungrounded service conductors.

single main 430.95

Where used outside. aluminum or copper-clad aluminum grounding conductors shall not be installed within_____inches of earth.

18 inches 250.64(A)

Direct-buried conductors and cables emerging from the ground shall not be required to be protected for more than inches below grade.

18 inches 300.5(D)(1)

A grounded conductor shall not be connected to normally non- current-carrying metal parts of equipment. to cquipment grounding conductor(s) or be reconnected to ground on the_____side of the service disconnecting means.

load 250.24(A)(5)

Direct burial cables installed in areas subject to vehicular traffic such as streets. highways. roads, alleys. driveways. and parking lots shall have a minimum cover of inches.

24 inches 300.5(A). Table 300.5