Article 300 - Wiring Methods and Materials

When going through a wood stud to install NM cable you must leave at least, — inches of wood between the edge of the stud and the edge of the hole. If this distance cannot be maintained, then metal plates at least — inch thick shall be used to protect the cables. 300.4(A)(1)

1/4, 1/16

# — and larger conductors require a bushing where entering an enclosure through a raceway. 300.4(G)

4

The minimum cover requirement for rigid metal conduit run under a street is — inchesT300.5

24

Landscape lighting cables must generally be buried 6 inches deep but a lesser depth is allowed if specified in the — T300.5 Footnote A

installation instructions

NM cable running along a studs length must be kept — inch from the edge of a stud 300.4(D)

1.25

Cable coming from underground and running up a pole must be protect — feet up 300.5(D)(1)

8

A raceway where moisture may enter through it and contact live parts must be — 300.5 (G)

sealed

Raceways going from a warm area to a cold area must be — 300.7(A)

sealed

Class 2 circuits may not be put in the same raceway with — conductors. 300.(3)(C)(1)

power

Computer cables — be laid on top of ceiling tiles 300.4(C) 

may not

Cables, boxes, and raceways must be kept at least — inches below the lowest part of corrugated metal roofing. 300.4(E)

1.5

Separate support wires may be installed in a suspended ceiling for the purpose of supporting raceways and cables but they must be — 300.11

distinguished from wires

In — branch circuits the continuity of the grounded conductor may not rely on — connections. 300.13(B)

multiwire, device

A minimum of — inches of free conductor must be left at each splice point AND if the box is less than — inches in any dimension you must have at least — inches of conductor extending out past the edge of the box. 300.14

6, 8, 3

According to 300.22(C), the space above a drop ceiling that is used for handling air requires the use of —

plenum cable

Openings through fire rated walls must be — 300.21

fire stopped

In order to keep ferrous metal enclosures from getting voltages induced into them, the code requires that all circuit conductors be — 300.20(A)

grouped

Surface mounted enclosures in wet locations must be spaced, — inch from the wall 300.6(D)

1/4

According to 300.17, the NEC limits the number of conductors in a raceway to prevent — of the conductors and also to prevent damage to the conductors while installing or — . 300.17

over heating, withdrawing

The NEC allows a fill of — % if only one conductor in a raceway, — % if two conductors in a raceway and — % if more than two conductors in a raceway. Table — Chapter —

53, 31, 40, 1, 9

If all the conductors in a raceway are the same size and the same insulation type, Note #1 that goes with table 1 tells us to use —

annex c