For a GFCI receptacle on a 20‑A branch circuit using 12 AWG copper, what is the minimum volume per conductor required for conductor fill?

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Multiple Choice

For a GFCI receptacle on a 20‑A branch circuit using 12 AWG copper, what is the minimum volume per conductor required for conductor fill?

Explanation:
Box-fill calculations use a volume per conductor based on wire gauge. For 12 AWG copper, each conductor that originates outside the box and terminates or is spliced inside counts as 2.25 cubic inches toward the box fill. On a 20-A branch circuit using 12 AWG copper, the per-conductor allowance is therefore 2.25 cubic inches. The presence of a GFCI receptacle doesn’t change this per-conductor value (though the total box fill will include the device yoke and any grounding conductors). The other options reflect different gauges, not 12 AWG, so they don’t fit this scenario.

Box-fill calculations use a volume per conductor based on wire gauge. For 12 AWG copper, each conductor that originates outside the box and terminates or is spliced inside counts as 2.25 cubic inches toward the box fill. On a 20-A branch circuit using 12 AWG copper, the per-conductor allowance is therefore 2.25 cubic inches. The presence of a GFCI receptacle doesn’t change this per-conductor value (though the total box fill will include the device yoke and any grounding conductors). The other options reflect different gauges, not 12 AWG, so they don’t fit this scenario.

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