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will834
04.06.2020 •
Mathematics
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Ответ:
The correct answer is D. 9 No. 16 wires
Correct statement and question:
An electrician is preparing to use a 4 x 1-1/2 square box with a volume of 21 in³. Which of the following wiring combinations will fit in this box?
A) 15 No. 18 wires
B) 11 No. 14 wires
C) 10 No. 12 wires
D) 9 No. 16 wires
Source:
https://www.chegg.com/homework-help/questions-and-answers/electrician-preparing-use-4-x-1-1-2-square-box-volume-21-in3-following-wiring-combinations-q10880489
Step-by-step explanation:
According to section 314 of the National Electric Code and assuming that there are no receptacles, switches, fixture studs, hickeys or internal cable clamps involved, the maximum number of conductors permitted in a 4 x 1 1/2 square box with a volume of 21 cubic inches are:
14 No. 1812 No. 1610 No. 149 No. 12Therefore,
A is incorrect because the electrician is exceeding the maximum permitted (15 > 14).
B. is also incorrect because the electrician is exceeding the maximum permitted (11 > 10).
C. Again it's not possible, because the electrician is exceeding the maximum permitted (10 > 9).
D. This is the correct answer because 9 wires No. 16 are allowed (9 < 12).