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Exam 10: Electrical Box Installation

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Question 1

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

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Question 2

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

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B) False

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Question 3

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When computing box fill, which of the following would count as one conductor?

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?

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

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

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

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

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

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

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

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

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

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

In residential wiring, which of the following is an area where Handy (Utility) boxes would not be used?

When installing electrical boxes above a dropped ceiling, it is OK to have the boxes supported by the same wires that hold up the dropped ceiling.

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:

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

When computing box fill, each 14 AWG lighting fixture wire counts as one conductor.

Explain the importance of the air barrier of a house, how air sealing contributes to air tightness of a house, and the proper role of electric boxes that interact with the air barrier.