Question 1

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.

Accepted Answer

The air barrier of a house is one of the...

Question 2

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

Accepted Answer

A)   10
B)   9
C)   8
D)   7E) B) and C)
F) A) and B)

Question 3

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

Accepted Answer

The answer of When computing box fill, all internal clamps...

Question 4

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:

Accepted Answer

A)   18 cubic inches
B)   21 cubic inches
C)   25.5 cubic inches
D)   30.5 cubic inchesE) A) and D)
F) None of the above

Question 5

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

Accepted Answer

A) True 
 B)False

Question 6

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?

Accepted Answer

A)   4 * 1 1/4
B)   4 * 1 1/2
C)   4 * 2 1/8
D)   4 11/16 * 1 1/4E) A) and B)
F) A) and C)

Question 7

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

Accepted Answer

A)   Single-pole switch
B)   External cable clamp
C)   Duplex receptacle
D)   None of the aboveE) A) and D)
F) None of the above D

Question 8

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

Accepted Answer

A)   set back no more than 1/8" from
B)   set back no more than 1/4" from
C)   set back no more than 1/2" from
D)   flush withE) A) and D)
F) A) and C)

Question 9

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.

Accepted Answer

A) True 
 B)False

Question 10

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

Accepted Answer

A)   the area of the box
B)   the perimeter of the box
C)   the volume of the box
D)   Underwriters LaboratoriesE) All of the above
F) C) and D)

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A)   10.00
B)   10.25
C)   10.50
D)   10.75E) C) and D)
F) B) and C)

Question 13

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

Accepted Answer

keyhole

Question 14

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.

Accepted Answer

A) True 
 B)False

Question 15

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

Accepted Answer

A)   Unfinished basements
B)   Unfinished garages
C)   Outdoors
D)   Storage buildingsE) B) and D)
F) None of the above

Question 16

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

Accepted Answer

The answer of Each unspliced conductor that is less than...

Question 17

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

Accepted Answer

2.50

Question 18

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

Accepted Answer

A)   2" * 4"
B)   2" * 2"
C)   4" * 4"
D)   3" * 2"E) A) and D)
F) A) and C)

Question 19

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

Accepted Answer

A)   Old work boxes
B)   New work boxes
C)   Re-model boxes
D)   Fill boxesE) B) and C)
F) All of the above

Question 20

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.

Accepted Answer

A)   1
B)   2
C)   3
D)   not countedE) B) and D)
F) B) and C)

Exam 10: Electrical Box Installation

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.

Correct AnswerverifiedThe air barrier of a house is one of the...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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:

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedD

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverifiedkeyhole

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct Answerverified2.50

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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The air barrier of a house is one of the...
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