An electrician is preparing to use a 4 × 11/2 square box with a volume of 21 cubic inches. which of the following wiring combinations will fit in this box?

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:

Therefore,

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).

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step-by-step explanation: