Ch 10 - Electrical Box Installation

8

A 3" x 2" 3 1/2" metal device box can hold a maximum of __________ 12 AWG conductors.

10

A 4" x 1 1/2" square box can hold a maximum of __________ 14 AWG conductors.

12

A plastic nail-on single-gang device box has a volume of 24 cubic inches. What is the maximum number of 14 AWG conductors it can hold?

35

Ceiling suspended paddle fans that weigh more than __________ pounds may be supported by an outlet box as long as the box has the maximum weight it can support marked on it.

1

Each unspliced conductor that is less than 12" long running through a box is counted as ____________________ conductor when computing box fill.

2

For each looped or coiled, unbroken length of conductor at least 12" long which passes through a box without splice or connection, the volume allowance is __________ of the actual conductor size.

outdoors

In residential wiring, _______________ is an area where Handy (Utility) boxes would not be used.

flush

In walls or ceilings made of noncombustible materials, electrical boxes must be mounted so they are __________ with the finished wall surface.

50

Lighting fixtures that weigh more than __________ pounds must be supported independently of the device box.

round

Nonmetallic electrical boxes used for lighting outlets in residential wiring are __________.

5 1/2 feet

The NEC requires all device boxes installed to meet the requirements of Section 210.52 to be no higher than _____________ but has no other rules regarding the mounting height of electrical boxes for switches or receptacles in residential wiring.

combustible

The NEC requires electrical boxes to be mounted so that they are flush with the finished surface of walls made of ____________________ materials.

2.25

When computing box fill for a box that has more than one size of conductor in it, a 12 AWG conductor counts as __________ cubic inches.

one

When computing box fill, each 14 AWG lighting fixture wire counts as _____ conductor(s).

internal cable clamps

When computing box fill, only _____________ count as one conductor.

1

When computing box fill, three ground wires are counted as ____________ conductor(s) of the largest conductor in the box.

Accessible

____________________ means capable of being removed or exposed without damaging the building structure or finish or not permanently closed in by the structure or finish of the building.

pigtail

A _______________ is a short length of wire used in electrical boxes to make connections to device terminals.

keyhole

A ________________ saw is used to cut holes in lath and plaster or sheetrock walls when installing old work electrical boxes.

Table 314.16(A)

In which of the following NEC Tables would you find information on box fill?

maximum

Nonmetallic device boxes used in residential wiring typically have both their cubic inch volume and the ____________ number of 14, 12, and 10 AWG conductors marked on the box.

25.5 cubic inches

The actual volume for a 4" x 1 1/2" square box with a 21 cubic inch volume with a single gang 4" x 3/4" raised plaster ring with a marked volume of 4.5 cubic inches attached to it is:

the volume of the box

The number of conductors permitted in a box is determined by __________.

3" x 2"

The size of the opening of a standard metal device box used to mount a switch or receptacle in a wall is __________.

2.5

The volume allowance for a 10 AWG conductor is ____________ cubic inches.

10.75

When computing box fill, 3 - 12 AWG conductors and 2 - 14 AWG conductors would total __________ cubic inches.

2

When computing box fill, a duplex receptacle is counted as ____________________ conductors of the size conductor attached to it.

1

When computing box fill, all internal clamps count as _________________ conductor(s) of the largest conductor in the box.

new work boxes

__________ have no ears on them and are designed to be attached directly to building framing members.

junction

A device or outlet box can also be used as a __________ box.

4 x 2 1/8

A metal 4" square box has ten 12 AWG conductors, four 12 AWG grounding conductors, and four external clamps. What is the minimum size 4" square box you could use?

3 x 2 x 2 1/2

A metal device box has two 14 AWG conductors, one 14 AWG grounding conductor, two internal clamps, and a duplex receptacle. What is the minimum size metal device box you could use?