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My electrical service entrance is on the opposite side of the house from the municipal water supply's copper pipe, so the panel ground wire runs about 30-40 feet through the house before it's bonded to the city copper.

Is there any problem running a 12-2 wire (120V + neutral, panel is 240V split) along the same path as the panel ground (same stud/joist holes, staples, etc.)? Would inductance from the circuit cause any problems with GFCI receptacles in the house?

  • Don't hang the circuit off the ground wire. Attach it separately. Shouldn't be an issue because current never flows on a ground, except during a ground fault. – Harper - Reinstate Monica Jan 12 '17 at 23:19
  • I think if it would be a problem homes with local transformers would have a problem because the main ground is run to the service panel with the service conductors. The service conductors create the largest field that A home could create and I have never had a problem with services up to 400a and more than 100' from the house. – Ed Beal Jan 13 '17 at 0:18
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It should not. The magnetic fields of the hot and neutral conductors should cancel each other out, as explained in this answer.

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