What is the minimum cubic inch capacity required for 12 AWG copper conductors in an outlet box?

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Multiple Choice

What is the minimum cubic inch capacity required for 12 AWG copper conductors in an outlet box?

Explanation:
Box fill uses a separate volume per conductor. For copper conductors, the NEC assigns 2.25 cubic inches of available space for each 12 AWG conductor. So the minimum capacity per conductor is 2.25 cubic inches. The other numbers don’t match the standard per-conductor allowance. If you have more conductors in the box, you add 2.25 for each one (and include any grounding conductors or device yokes per the code), which is why 2.25 is the correct baseline.

Box fill uses a separate volume per conductor. For copper conductors, the NEC assigns 2.25 cubic inches of available space for each 12 AWG conductor. So the minimum capacity per conductor is 2.25 cubic inches. The other numbers don’t match the standard per-conductor allowance. If you have more conductors in the box, you add 2.25 for each one (and include any grounding conductors or device yokes per the code), which is why 2.25 is the correct baseline.

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