The maximum number of #12 conductors that may be installed in a 2 1/8 inch × 4 11/16 inch square box is?

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Multiple Choice

The maximum number of #12 conductors that may be installed in a 2 1/8 inch × 4 11/16 inch square box is?

Explanation:
Focus on box fill. The box’s interior volume for this size is about 46.7 cubic inches. For #12 conductors, you must allocate 2.25 cubic inches per conductor. Box fill also includes one equipment grounding conductor (counted as one conductor) and, if present, any internal clamps (also counted as one conductor). That leaves 46.7 − 4.5 ≈ 42.2 cubic inches for insulated conductors. Dividing by 2.25 gives about 18.7, so the practical maximum is 18 conductors. Therefore, the maximum number of #12 conductors that may be installed is 18 (note: adding a device with a yoke would require adding to that count).

Focus on box fill. The box’s interior volume for this size is about 46.7 cubic inches. For #12 conductors, you must allocate 2.25 cubic inches per conductor. Box fill also includes one equipment grounding conductor (counted as one conductor) and, if present, any internal clamps (also counted as one conductor). That leaves 46.7 − 4.5 ≈ 42.2 cubic inches for insulated conductors. Dividing by 2.25 gives about 18.7, so the practical maximum is 18 conductors. Therefore, the maximum number of #12 conductors that may be installed is 18 (note: adding a device with a yoke would require adding to that count).

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