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EET1051 H-3 Boxes (12 h)

Text Book: Article 314
House Wiring: Chapter 2, pages 28-31
True/False

Indicate whether the statement is true or false.
 

 1. 

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

 2. 

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.
 

 3. 

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

 4. 

The NEC requires all device boxes installed to meet the requirements of Section 210.52 to be no higher than 5 1/2 feet but has no other rules regarding the mounting height of electrical boxes for switches or receptacles in residential wiring.
 

 5. 

The NEC requires that device boxes be installed so that all nails or screws are outside the box.
 

 6. 

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

 7. 

A wire that has its origin inside a device box and does not leave the device box, such as a pigtail, counts as one conductor when computing box fill.
 

 8. 

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.
 

Multiple Choice
Identify the choice that best completes the statement or answers the question.
 

 9. 

__________ have no ears on them and are designed to be attached directly to building framing members.
a.
Old work boxes
b.
New work boxes
c.
Re-model boxes
d.
Fill boxes
 

 10. 

When computing box fill, which of the following would count as one conductor?
a.
Single-pole switch
b.
External cable clamp
c.
Receptacle
d.
None of the above
 

 11. 

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

 12. 

In residential wiring, which of the following is an area where Handy boxes would not be used?
a.
Unfinished basements
b.
Unfinished garages
c.
Outdoors
d.
Storage buildings
 

 13. 

Nonmetallic electrical boxes used for lighting outlets in residential wiring are __________.
a.
rectangular
b.
square
c.
octagonal
d.
round
 

 14. 

Lighting fixtures that weigh more than __________ pounds must be supported independently of the device box.
a.
35
b.
40
c.
50
d.
55
 

 15. 

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.
a.
35
b.
40
c.
50
d.
55
 

 16. 

The size of the opening of a standard metal device box used to mount a switch or receptacle in a wall is __________.
a.
2" × 4"
b.
2" × 2"
c.
4" × 4"
d.
3" × 2"
 

 17. 

In which of the following NEC Tables would you find information on box fill?
a.
Table 220.12
b.
Table 314.16(A)
c.
Table 250.66
d.
Table 8 in Chapter 9
 

 18. 

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.
a.
1.75
b.
2.0
c.
2.25
d.
2.5
 

 19. 

Which of the following would count as two conductors when computing box fill?
a.
Single-pole switch
b.
Duplex Receptacle
c.
GFCI Receptacle
d.
All of the above
 

 20. 

When computing box fill, 3 - 12 AWG conductors and 2 - 14 AWG conductors would total __________ cubic inches.
a.
10.00
b.
10.25
c.
10.50
d.
10.75
 

 21. 

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:
a.
18 cubic inches
b.
21 cubic inches
c.
25.5 cubic inches
d.
30.5 cubic inches
 

 22. 

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.
a.
1
b.
2
c.
3
d.
not counted
 

 23. 

A 3" x 2" 3 1/2" metal device box can hold a maximum of __________ 12 AWG conductors.
a.
10
b.
9
c.
8
d.
7
 

 24. 

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?
a.
12
b.
14
c.
18
d.
24
 

 25. 

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?
a.
4 x 1 1/4
b.
4 x 1 1/2
c.
4 x 2 1/8
d.
4 11/16 x 1 1/4
 



 
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