Understanding NEC Articles 312 & 314 Flashcards
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 3: 312
312.1
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 3: weatherproof
312.2
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 4: combustible
312.3
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 3: 1⁄8 in.
312.4
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 1: secured
312.5(C)
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 2: 10 ft
312.5(C) Ex 1
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 1: 4 in.
312.6(A)(2) Table
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 2: 6 in.
312.6(A)(2) Table
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 4: any of these
312.10(1), (2), and (3)
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 3: 3⁄8 in.
312.10(3) Ex
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 4: Article 314
314.1
Nonmetallic boxes can be used with _____.
Answer 1: nonmetallic sheaths
Answer 2: nonmetallic raceways
Answer 3: flexible cords
Answer 4: all of these
Answer 4: all of these
314.3
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 2: bonding
314.3 Ex 1
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 3: 3⁄8 in.
314.5(5)
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 4: flush with the box interior
314.5(6)
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 4: flush with the conduit body
314.5(7)
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 2: 10 cu in.
314.16(A) Table
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 3: 3¾ in. × 2 in. x 3½ in.
314.16(A) Table
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 2: 9
314.16(A) Table
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 4: 20.25 cu in.
314.16(B) and (B)(1) Table
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 2: two
314.16(B)(1)
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 1: largest conductor
314.16(B)(2)
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 1: a single
314.16(B)(3)
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 3: gang
314.16(B)(4)
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 2: a double
314.16(B)(4)
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 1: volume
314.16(C)(2)
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 1: ¼ in.
314.17(B)(2)
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 2: ¼ in.
314.20.
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 2: 1⁄8 in.
314.21
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 1: rigidly and securely fastened in place
314.23(A)
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 1: corrosion
314.23(B)(2)
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 1: 1 in. × 2 in.
314.23(B)(2)
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 4: rigidly
314.23(C)
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 4: 50 lb
314.27(A)(1)
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 4: 50 lb
314.27(A)(2)
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 4: 50 lb
314.27(A)(2)
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 2: listed
314.27(B)
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 1: 35 lb
314.27(C)
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 3: of dwelling occupancies
314.27(C)
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 1: 8 times
314.28(A)(1)
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 4: 21 in.
314.28(A)(2)
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 1: 5 in.
314.28(A)(2) Ex and 312.6(A)
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 1: six times
314.28(A)(2)
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 1: one
314.28(A)(2) Ex
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 2: 6 ft
314.28(B)
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 1: boxes and handhole enclosures
314.29(B).
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 4: all loads likely to be imposed on them
314.30
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 1: wet locations
314.30(C)
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 4: electric
314.30(D)
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 3: 100 lb
314.30(D)
