Understanding NEC Articles 312 & 314

Question 1

Article _____ covers the installation and construction specifications of cabinets cutout boxes and meter socket enclosures.
Answer 1: 300
Answer 2: 310
Answer 3: 312
Answer 4: 314

Answer 1

Answer 3: 312

312.1

Question 2

Cabinets cutout boxes and meter socket enclosures installed in wet locations shall be _____.
Answer 1: waterproof
Answer 2: raintight
Answer 3: weatherproof
Answer 4: watertight

Answer 2

Answer 3: weatherproof

312.2

Question 3

In walls constructed of wood or other _____ material electrical cabinets shall be flush with the finished surface or project therefrom.
Answer 1: nonconductive
Answer 2: porous
Answer 3: fibrous
Answer 4: combustible

Answer 3

Answer 4: combustible

312.3

Question 4

Noncombustible surfaces that are broken or incomplete shall be repaired so there will be no gaps or open spaces greater than _____ at the edge of a cabinet or cutout box employing a flush-type cover.
Answer 1: 1⁄32 in.
Answer 2: 1⁄16 in.
Answer 3: 1⁄8 in.
Answer 4: ¼ in.

Answer 4

Answer 3: 1⁄8 in.

312.4

Question 5

Where cable is used each cable shall be _____ to the cabinet cutout box or meter socket enclosure.
Answer 1: secured
Answer 2: supported
Answer 3: strapped
Answer 4: stapled

Answer 5

Answer 1: secured

312.5(C)

Question 6

Nonmetallic-sheathed cables can enter the top of surface-mounted cabinets cutout boxes and meter socket enclosures through nonflexible raceways not less than 18 in. and not more than _____ in length if all of the required conditions are met.
Answer 1: 3 ft
Answer 2: 10 ft
Answer 3: 25 ft
Answer 4: 100 ft

Answer 6

Answer 2: 10 ft

312.5(C) Ex 1

Question 7

The minimum wire-bending space and gutter width at terminals for 4/0 AWG entering an enclosure is _____.
Answer 1: 4 in.
Answer 2: 6 in.
Answer 3: 7 in.
Answer 4: 8 in.

Answer 7

Answer 1: 4 in.

312.6(A)(2) Table

Question 8

The minimum wire-bending space and gutter width at terminals for 500 kcmil entering an enclosure is _____.
Answer 1: 4 in.
Answer 2: 6 in.
Answer 3: 7 in.
Answer 4: 8 in.

Answer 8

Answer 2: 6 in.

312.6(A)(2) Table

Question 9

Screws or other fasteners installed in the field that enter wiring spaces of cabinets and cutout boxes shall be as provided by or specified by the manufacturer or _____.
Answer 1: screws shall be machine type
Answer 2: other fasteners shall have blunt ends
Answer 3: screws or other fasteners shall extend no more than 1/4 in. into the enclosure unless the end is protected with an approved means
Answer 4: any of these

Answer 9

Answer 4: any of these

312.10(1), (2), and (3)

Question 10

Screws or other fasteners installed in the field that enter wiring spaces of cabinets and cutout boxes shall be permitted to extend into the enclosure not more than 7⁄16 in. if located within _____ of an enclosure wall.
Answer 1: 1⁄8 in.
Answer 2: 1/4 in.
Answer 3: 3⁄8 in.
Answer 4: 1/2 in.

Answer 10

Answer 3: 3⁄8 in.

312.10(3) Ex

Question 11

The installation and use of all boxes and conduit bodies used as outlet device junction or pull boxes depending on their use and handhole enclosures are covered within _____.
Answer 1: Article 110
Answer 2: Article 200
Answer 3: Article 300
Answer 4: Article 314

Answer 11

Answer 4: Article 314

314.1

Question 12

Nonmetallic boxes can be used with _____.
Answer 1: nonmetallic sheaths
Answer 2: nonmetallic raceways
Answer 3: flexible cords
Answer 4: all of these

Answer 12

Answer 4: all of these

314.3

Question 13

Where internal _____ means are provided between all entries nonmetallic boxes shall be permitted to be used with metal raceways or metal-armored cables.
Answer 1: grounding
Answer 2: bonding
Answer 3: connecting
Answer 4: splicing

Answer 13

Answer 2: bonding

314.3 Ex 1

Question 14

Screws or other fasteners installed in the field that enter wiring spaces penetrating a wall of a pull or junction box exceeding 100 cu in. shall extend no more than ¼ in. or more than 7⁄16 in. if located within _____of cabinets and cutout boxes of an adjacent box wall.
Answer 1: 1⁄8 in.
Answer 2: 1/4 in.
Answer 3: 3⁄8 in.
Answer 4: 1/2 in.

Answer 14

Answer 3: 3⁄8 in.

314.5(5)

Question 15

Screws or other fasteners installed in the field that enter wiring spaces penetrating a wall of a pull or junction box not exceeding 100 cu in. and not covered in 314.23(B)(1) shall be made _____.
Answer 1: within 1⁄8 in. of the box interior
Answer 2: within 1/4 in. of the box interior
Answer 3: within 3⁄8 in. of the box interior
Answer 4: flush with the box interior

Answer 15

Answer 4: flush with the box interior

314.5(6)

Question 16

In accordance with Article 314 screws or other fasteners installed in the field that enter wiring spaces penetrating the wall of a conduit body shall be made _____.
Answer 1: within 1⁄8 in. of the conduit body
Answer 2: within 1/4 in. of the conduit body
Answer 3: within 3⁄8 in. of the conduit body
Answer 4: flush with the conduit body

Answer 16

Answer 4: flush with the conduit body

314.5(7)

Question 17

According to the NEC the volume of a 3 in. × 2 in. × 2 in. device box for conductor fill is _____.
Answer 1: 8 cu in.
Answer 2: 10 cu in.
Answer 3: 12 cu in.
Answer 4: 14 cu in.

Answer 17

Answer 2: 10 cu in.

314.16(A) Table

Question 18

A metal box sized _____ can accommodate nine 12 AWG conductors.
Answer 1: 4 in. × 4 in. × 1¼ in.
Answer 2: 3¾ in. × 2 in. × 3 in.
Answer 3: 3¾ in. × 2 in. x 3½ in.
Answer 4: none of these

Answer 18

Answer 3: 3¾ in. × 2 in. x 3½ in.

314.16(A) Table

Question 19

The number of 12 AWG THWN-2 conductors permitted in a 4 in. × 4 in.× 1 1/2 in. box is _____.
Answer 1: 7
Answer 2: 9
Answer 3: 11
Answer 4: 13

Answer 19

Answer 2: 9

314.16(A) Table

Question 20

The total volume occupied by two internal cable clamps six 12 AWG conductors and a single-pole switch is _____.
Answer 1: 2.00 cu in.
Answer 2: 4.50 cu in.
Answer 3: 14.50 cu in.
Answer 4: 20.25 cu in.

Answer 20

Answer 4: 20.25 cu in.

314.16(B) and (B)(1) Table

Question 21

When counting the number of conductors in a box a conductor running through the box with an unbroken loop or coil not less than twice the minimum length required for free conductors shall be counted as _____ conductor volume(s) in accordance with Table 314.16(B)(1).
Answer 1: one
Answer 2: two
Answer 3: three
Answer 4: four

Answer 21

Answer 2: two

314.16(B)(1)

Question 22

Where one or more internal cable clamps are present in the box a single volume allowance shall be made based on the _____ present in the box.
Answer 1: largest conductor
Answer 2: smallest conductor
Answer 3: average conductor size
Answer 4: number of devices

Answer 22

Answer 1: largest conductor

314.16(B)(2)

Question 23

Where a luminaire stud or hickey is present in the box _____ volume allowance shall be made for each type of fitting based on the largest conductor present in the box.
Answer 1: a single
Answer 2: a double
Answer 3: a ¼
Answer 4: no additional

Answer 23

Answer 1: a single

314.16(B)(3)

Question 24

For the purposes of determining box fill each device or utilization equipment in the box which is wider than a single device box counts as two volume allowances for each _____ required for the mounting.
Answer 1: in.
Answer 2: ft
Answer 3: gang
Answer 4: box

Answer 24

Answer 3: gang

314.16(B)(4)

Question 25

A device or utilization equipment wider than a single 2 in. device box shall have _____ volume allowance provided for each gang required for mounting. Answer 1: a single Answer 2: a double Answer 3: a ¼ Answer 4: no additional

Answer 25

Answer 2: a double | 314.16(B)(4)

Question 26

Conduit bodies that are durably and legibly marked by the manufacturer with their _____ can contain splices taps or devices. Answer 1: volume Answer 2: size Answer 3: rating Answer 4: capacity

Answer 26

Answer 1: volume | 314.16(C)(2)

Question 27

Where cable assemblies with nonmetallic sheaths are used the sheath shall extend not less than _____ inside the box and beyond any cable clamp. Answer 1: ¼ in. Answer 2: 3⁄8 in. Answer 3: ½ in. Answer 4: ¾ in.

Answer 27

Answer 1: ¼ in. | 314.17(B)(2)

Question 28

In installations within noncombustible walls or ceilings the front edge of a box plaster ring extension ring or listed extender employing a flush-type cover shall be set back not more than _____ from the finished surface. Answer 1: 1⁄8 in. Answer 2: ¼ in. Answer 3: 3⁄8 in. Answer 4: ½ in.

Answer 28

Answer 2: ¼ in. | 314.20.

Question 29

Noncombustible surfaces that are broken or incomplete around boxes employing a flush-type cover shall be repaired so there will be no gaps or open spaces larger than _____ at the edge of the box. Answer 1: 1⁄16 in. Answer 2: 1⁄8 in. Answer 3: ¼ in. Answer 4: ½ in.

Answer 29

Answer 2: 1⁄8 in. | 314.21

Question 30

An outlet box or enclosure mounted on a building or other surface shall be _____. Answer 1: rigidly and securely fastened in place Answer 2: supported by cables that protrude from the box Answer 3: supported by cable entries from the top and permitted to rest against the supporting surface Answer 4: permitted to be supported by the raceway(s) terminating at the box

Answer 30

Answer 1: rigidly and securely fastened in place | 314.23(A)

Question 31

In accordance with Article 314 metal braces used for the support of boxes shall be protected against _____. Answer 1: corrosion Answer 2: weather Answer 3: rain Answer 4: snow

Answer 31

Answer 1: corrosion | 314.23(B)(2)

Question 32

A wood brace used for supporting a box for structural mounting shall have a cross-section not less than nominal _____. Answer 1: 1 in. × 2 in. Answer 2: 2 in. × 2 in. Answer 3: 2 in. × 3 in. Answer 4: 2 in. × 4 in.

Answer 32

Answer 1: 1 in. × 2 in. | 314.23(B)(2)

Question 33

When mounting an enclosure in a finished surface the enclosure shall be _____ secured to the surface by clamps anchors or fittings identified for the application. Answer 1: temporarily Answer 2: partially Answer 3: never Answer 4: rigidly

Answer 33

Answer 4: rigidly | 314.23(C)

Question 34

Boxes used at luminaire outlets on a vertical surface shall be marked on the interior of the box to indicate the maximum weight of the luminaire that is permitted to be supported by the box if other than _____. Answer 1: 6 lb Answer 2: 12 lb Answer 3: 35 lb Answer 4: 50 lb

Answer 34

Answer 4: 50 lb | 314.27(A)(1)

Question 35

Boxes used at luminaire or lampholder outlets in a ceiling shall be designed so that a luminaire or lampholder can be attached and the boxes shall be required to support a luminaire weighing a minimum of _____. Answer 1: 20 lb Answer 2: 30 lb Answer 3: 40 lb Answer 4: 50 lb

Answer 35

Answer 4: 50 lb | 314.27(A)(2)

Question 36

A luminaire that weighs more than _____ can be supported by an outlet box that is listed for the weight of the luminaire. Answer 1: 20 lb Answer 2: 30 lb Answer 3: 40 lb Answer 4: 50 lb

Answer 36

Answer 4: 50 lb | 314.27(A)(2)

Question 37

Floor boxes _____ specifically for the application shall be used for receptacles located in the floor. Answer 1: identified Answer 2: listed Answer 3: approved Answer 4: designed

Answer 37

Answer 2: listed | 314.27(B)

Question 38

Listed outlet boxes to support ceiling-suspended fans that weigh more than _____ shall have the maximum allowable weight marked on the box. Answer 1: 35 lb Answer 2: 50 lb Answer 3: 60 lb Answer 4: 70 lb

Answer 38

Answer 1: 35 lb | 314.27(C)

Question 39

Outlet boxes mounted in the ceilings of habitable rooms _____ in a location acceptable for the future installation of a ceiling-suspended (paddle) fan shall be listed for the support of ceiling-suspended paddle fans. Answer 1: used for childcare Answer 2: of guest suites Answer 3: of dwelling occupancies Answer 4: of apartments

Answer 39

Answer 3: of dwelling occupancies | 314.27(C)

Question 40

In straight pulls of 2-in. raceways the length of the pull box shall be a minimum of _____ the trade diameter of the 2-in. raceway. Answer 1: 8 times Answer 2: 7 times Answer 3: 5 times Answer 4: 10 times

Answer 40

Answer 1: 8 times | 314.28(A)(1)

Question 41

The minimum distance from the raceway entry to the opposite wall of a pull or junction box for a U pull with two 3-in. raceways is _____. Answer 1: 16 in. Answer 2: 15 in. Answer 3: 18 in. Answer 4: 21 in.

Answer 41

Answer 4: 21 in. | 314.28(A)(2)

Question 42

The minimum depth required for a pull box in a wet location that has a 3½ in. raceway with three 400 kcmil XHHW compact aluminum conductors entering the wall opposite a removable cover is _____. Answer 1: 5 in. Answer 2: 7 in. Answer 3: 9 in. Answer 4: 11 in.

Answer 42

Answer 1: 5 in. | 314.28(A)(2) Ex and 312.6(A)

Question 43

Where splices angle or U pulls are made the distance between each raceway entry inside the box and the opposite wall of the box may not be less than _____ the trade size of the largest raceway. Answer 1: six times Answer 2: eight times Answer 3: ten times Answer 4: twelve times

Answer 43

Answer 1: six times | 314.28(A)(2)

Question 44

Where a raceway or cable entry is in the wall of a box or conduit body opposite a removable cover the distance from that wall to the cover shall be permitted to comply with the distance required for _____ wire(s) per terminal in accordance with Table 312.6(A). Answer 1: one Answer 2: two Answer 3: three Answer 4: four

Answer 44

Answer 1: one | 314.28(A)(2) Ex

Question 45

Pull boxes or junction boxes with any dimension over _____ shall have all conductors cabled or racked in an approved manner. Answer 1: 3 ft Answer 2: 6 ft Answer 3: 9 ft Answer 4: 12 ft

Answer 45

Answer 2: 6 ft | 314.28(B)

Question 46

Underground _____ shall be installed so they are accessible without excavating sidewalks paving earth or other substance that is to be used to establish the finished grade. Answer 1: boxes and handhole enclosures Answer 2: conduit bodies Answer 3: handhole enclosures Answer 4: none of these

Answer 46

Answer 1: boxes and handhole enclosures | 314.29(B).

Question 47

Handhole enclosures shall be designed and installed to withstand _____. Answer 1: 600 lb of pressure Answer 2: 3000 lb of pressure Answer 3: 6000 lb of pressure Answer 4: all loads likely to be imposed on them

Answer 47

Answer 4: all loads likely to be imposed on them | 314.30

Question 48

Conductors splices or terminations in a handhole enclosure shall be listed as suitable for _____. Answer 1: wet locations Answer 2: damp locations Answer 3: direct burial in the earth Answer 4: exterior use

Answer 48

Answer 1: wet locations | 314.30(C)

Question 49

Handhole enclosure covers shall have an identifying mark or logo that prominently identifies the function of the enclosure such as _____. Answer 1: danger Answer 2: utility Answer 3: high voltage Answer 4: electric

Answer 49

Answer 4: electric | 314.30(D)

Question 50

Handhole enclosure covers shall require the use of tools to open or they shall weigh over _____. Answer 1: 45 lb Answer 2: 70 lb Answer 3: 100 lb Answer 4: 200 lb

Answer 50

Answer 3: 100 lb | 314.30(D)