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EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
ISBN: 9781337516549

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Section
BuyFindarrow_forward

EBK ELECTRICAL WIRING RESIDENTIAL

19th Edition
Simmons
Publisher: CENGAGE LEARNING - CONSIGNMENT
ISBN: 9781337516549
Chapter 11, Problem 2R
Textbook Problem
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Assuming that an outlet box for the entry ceiling has a fixture stud but has external cable clamps, what size box could be installed? Show calculations for both metal and nonmetallic boxes. ___________

To determine

State the required outlet box size for both metallic and non-metallic boxes.

Explanation of Solution

Discussion:

Calculate the conductors that are needed for the outlet box. The circuit conductors (14 AWG) are 9, add one conductor for luminaire stud, and add one conductor for one or more equipment grounding wires. Therefore, the total required number of conductors is 9+1+1=11conductors.

According to NEC Table 314.16(A), the possible outlet box sizes are 4'' octagonal, 2⅛'' deep box or 4'' square, 2⅛'' deep box with a plaster ring. This is to be used for metal boxes only.

Using a non-metallic box, refer to NEC Table 314.16(B) and it is found that 14 AWG conductors need a volume of 2 cubic inches

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