Conductor count

[Sparks 257ai]

If you have a 3 phase 4 wire ( neutral + ground) 20 amp device with the yoke size under 2 inches, what does that contribute to box size calculations with regards to sizing a shallow four inch square box versus sizing a four inch square deep box.

 

[infinity]

One yoke counts as two conductors for box fill.

 

[jusme123]

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[kwired]

Don't forget you can add the volume of a raised cover or mud ring to the volume of the box.