Question 13068 of 749 · Maryland Journeyperson Electrician Exam
A 4 inch by 1-1/2 inch square box (21.0 cu in) has a plaster ring marked 3.6 cu in. What is the maximum number of 12 AWG conductors permitted if nothing else is in the box?
Exactly one answer is correct.
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Correct answer to question 13068
- D: 10
Explanation
Volumes of a marked ring or extension add to the box: 21.0 + 3.6 = 24.6 cu in, and 24.6 / 2.25 = 10.9, which rounds down to 10. The box alone allows only 9, and rounding up to 11 is not permitted.
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