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In box fill, a single-gang device yoke (a switch or receptacle) counts as how many conductor volumes?

A single-gang yoke counts as two conductor volumes.

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  1. One
  2. Three
  3. Two ✔

Why: A device like a receptacle takes up space in the box. Each single-gang yoke counts as two conductor volumes, no matter how big the device is.

Huh, didn't know that: Multigang yokes count two volumes per gang.

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References

Answer: Two. A device like a receptacle takes up space in the box. Each single-gang yoke counts as two conductor volumes, no matter how big the device is.

  1. EC&M: NEC Requirements for Sizing Outlet Boxes www.ecmweb.com/code-basics/nec-requirements-sizing-outlet-boxes
    Each single-gang device yoke (regardless of the physical size of the device) counts as two conductor volumes.
    Checked 2026-10-10.

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