NEC practice exam

Direct-buried service conductors that are not encased in concrete and that are buried 18 in. or more below grade shall have their location identified by a warning ribbon placed in the trench at least _____ above the underground installation.

12 in. 300.5(D)(3)

What is the minimum cover requirement for Type UF cable supplying power to a 120V, 15A GFCI-protected circuit outdoors under a driveway of a one-family dwelling?

12 in. 300.5, Table Column 4

If a set of 120/240V overhead service conductors terminate at a through-the-roof raceway or approved support, with less than 6 ft of these conductors passing over the roof overhang, the minimum clearance above the roof for these service conductors shall be _____.

18 in. 230.24(A) Ex 3

For other than dwelling units or guest rooms of hotels or motels, the feeder and service calculation for track lighting shall be calculated at 150 VA for every _____ of lighting track or fraction thereof unless the track is supplied through a device that limits the current to the track

2 ft 220.43(B)

Conductor adjustment factors shall not apply to conductors in raceways having a length not exceeding _____.

24 in. 310.15(B)(3)(a)(2)

For installations consisting of not more than two 2-wire branch circuits, the building disconnecting means shall have a rating of not less than _____.

30A 225.39(B)

Type AC cable installed horizontally through wooden or metal framing members is considered supported where support doesn't exceed _____.

4½ ft 320.30(C)

A luminaire that weighs more than _____ can be supported by an outlet box that is listed and marked for the weight of the luminaire.

50 lb 314.27(A)(2)

Type MC cable shall be secured at intervals not exceeding _____.

6 ft 330.30(B)

An equipment bonding jumper can be installed on the outside of a raceway, providing the length of the equipment bonding jumper is not more than _____ and the equipment bonding jumper is routed with the raceway.

72 in. 250.102(E)(2)

Conduit bodies containing conductors larger than 6 AWG shall have a cross-sectional area at least twice that of the largest conduit to which they can be attached.

False 314.16(C)(1)

Conductors are considered outside a building when they are installed:

Installed in a vault that meets the construction requirements of Article 450. Within a building or structure in a raceway encased in not less than a 2 in. thickness of concrete or brick. Under not less than 2 in. of concrete beneath a building or structure. 230.6(1),(2), and (3)

Type _____ is a factory assembly of insulated circuit conductors within an armor of interlocking metal tape, or a smooth or corrugated metallic sheath.

MC 330.2

Insulated conductors used in wet locations shall be _____.

MTW, RHW, RHW-2, TW, THW, THW-2, THHW, THWN, THWN-2, XHHW, XHHW-2, ZW listed for wet locations moisture-impervious metal sheathed 310.10(C)(1),(2), and (3)

Where conductors in parallel are run in separate raceways, the raceways shall have the same electrical characteristics.

True 310.10(H)(3)

Conduit bodies that are durably and legibly marked by the manufacturer with their volume can contain splices, taps, or devices.

True 314.16(C)(2)

An 800A fuse rated at 600V _____ on a 250V system.

can be used 240.61

Ground-fault protection of equipment shall be provided for solidly grounded wye electrical systems of more than 150 volts-to-ground, but not exceeding 600V phase-to-phase for each individual device used as a building or structure main disconnecting means rated _____ or more, unless specifically exempted.

1,000A 240.13

According to the NEC, the volume of a 3 x 2 x 2 in. device box is _____

10 cu in. 314.16(A)Table

Floor boxes _____ specifically for the application shall be used for receptacles located in the floor.

listed 314.27(B)

Overhead service conductors shall have a horizontal clearance of _____ from a pool.

10 ft 230.24(D), 680.8(A), and Table 680.8

The space above a hung ceiling used for environmental air-handling purposes is an example of _____, and the wiring limitations of _____ apply.

other space used for environmental air (plenum), 300.22(C) 300.22(C) Note 1

Surface-mounted outlet boxes shall be _____.

rigidly and securely fastened in place 314.23(A)

Bends made in interlocked or corrugated sheath Type MC cable shall have a radius of at least _____ times the external diameter of the metallic sheath.

seven . 330.24(B)

Each cable entering a cutout box _____.

shall be secured to the cutout box 312.5(C)

Where a luminaire stud or hickey is present in the box, a _____ volume allowance in accordance with Table 314.16(B) shall be made for each type of fitting, based on the largest conductor present in the box.

single 314.16(B)(3)

Dwelling unit or mobile home feeder conductors need not be larger than the service conductors and can be sized according to 310.15(B)(7).

True 215.2(A)(4)

Conductors installed in overhead service masts on the outside surface of the building traveling through the eave of that building are considered to be outside of the building.

True 230.6(5)

Ceiling-support wires used for the support of electrical raceways and cables within nonfire-rated assemblies shall be distinguishable from the suspended-ceiling framing support wires.

True 300.11(A)(2)

Service-drop conductors shall have _____.

adequate mechanical strength sufficient ampacity to carry the load 230.23(A)

An electrode encased by at least 2 in. of concrete, located horizontally near the bottom or vertically and within that portion of a concrete foundation or footing that is in direct contact with the earth, shall be permitted as a grounding electrode when it consists of _____.

at least 20 ft of bare copper conductor of 4 AWG or larger at least 20 ft of ½ in. or larger steel reinforcing bars or rods 250.52(A)(3)

Fittings used for connecting Type MC cable to boxes, cabinets, or other equipment shall _____.

be listed and identified for such use 330.40

Equipment grounding conductors for motor branch circuits shall be sized in accordance with Table 250.122, based on the rating of the _____ device.

branch circuit short-circuit and ground-fault protective 250.122(D)(1)

Conductors in raceways shall be _____ between outlets, boxes, devices, and so forth.

continuous 300.13(A)

Backfill used for underground wiring shall not _____.

damage the wiring method prevent compaction of the fill contribute to the corrosion of the raceway 300.5(F)

Each strap containing one or more devices shall count as a _____ volume allowance in accordance with Table 314.16(B), based on the largest conductor connected to a device(s) or equipment supported by the strap.

double 314.16(B)(4)

Bonding shall be provided where necessary to ensure _____ and the capacity to conduct safely any fault current likely to be imposed.

electrical continuity 250.9

Equipment grounding conductor(s), and not more than _____ fixture wire(s) smaller than 14 AWG can be omitted from the calculations where they enter the box from a domed luminaire or similar canopy and terminate within that box.

four 314.16(B)(1) Ex

At Type AC cable terminations, a(n) _____ shall be provided.

insulating bushing between the conductors and the cable armor fitting (or box design) that protects the conductors from abrasion 320.40

Ferrous metal raceways, boxes, fittings, supports, and support hardware can be installed in concrete or in direct contact with the earth or other areas subject to severe corrosive influences, where _____ approved for the conditions.

made of material 300.6(A)(3)

Dimensions of Type S fuses, fuseholders, and adapters shall be standardized to permit interchangeability regardless of the _____.

manufacturer 240.54(E)

Metal raceways, cable armors, and other metal enclosures shall be _____ joined together into a continuous electric conductor so as to provide effective electrical continuity.

metallically 300.10

Ground-fault protection of equipment shall not be required at a feeder disconnect if ground-fault protection of equipment is provided on the _____ side of the feeder and on the load side of any transformer supplying the feeder.

supply 215.10 Ex 2

For a single separately derived system, the grounding electrode conductor connects the grounded conductor of the derived system to the grounding electrode at the same point on the separately derived system where the _____ is connected.

system bonding jumper 250.30(A)(5)

Electrical equipment shall not be connected to the supply side of the service disconnecting means, except for a few specific exceptions such as _____.

taps used to supply legally required optional standby power systems, fire pump equipment, fire and sprinkler alarms, and load (energy) management devices solar photovoltaic systems Type 1 surge protective devices 230.82(4),(5), and (6)

Conductors smaller than 1/0 AWG can be connected in parallel to supply control power, provided _____.

the circuit overcurrent device rating does not exceed the ampacity of any individual parallel conductor they are all contained within the same raceway or cable each parallel conductor has an ampacity sufficient to carry the entire load 310.10(H)(1) Ex 1

Alternating-current systems from 50V to less than 1,000V that aren't required to be grounded as per 250.20(B) must have _____.

the ground detection sensing equipment connected as close as practicable to where the system receives its supply ground detectors installed 250.21(B)(1) and (2)

Cable trays used to support service-entrance conductors shall contain only service-entrance conductors _____.

unless a solid fixed barrier separates the service-entrance conductors from other conductors 230.44 Ex

Where raceways are installed in wet locations above grade, the interior of these raceways shall be considered a _____ location.

wet 300.9

Armored cable shall not be installed _____.

where exposed to corrosive conditions in damp or wet locations where subject to physical damage 320.12(1),(2), and (4)