I have a 50 amp circuit wired with 6 Gauge AA-8000 Aluminum SE wire from the panel that goes to my oven/microwave combo, and then continues on to my cooktop. Both the oven/microwave combo as well as the cooktop have 4 wires. The instructions say wire red to red, black to black, and ground/neutral to the 3rd wire in the feeder, in my case stranded bare aluminum twisted together. I have been doing some research and have been told that bootlegging the ground off the neutral can cause a dangerous situation if something happens for Neutral to float at a hot voltage, now ground is hot too and you lose the protection.

That being said, I have a 50 AMP spa panel, on a different circuit obviously, that is fed by 6/3 cable back to the panel. Is it ok to run a ground from my spa panel with 6 Gauge green sheathed wire, to my oven, then cooktop and use that for the ground, the bare aluminum for neutral, and black to black, red to red, and now have a safe 4 wire circuit?

This wouldn't impact my spa GFCI breaker would it?

Apparently stealing ground from another circuit came was allowed in 2014 NEC from what I have read, but there seems to be a caveat that it must come from a circuit that originates in the same panel. Would this be the case if I connected ground in my spa panel which is connected to my main panel with the oven/range circuit? What if I break into the circuit between the spa panel and the main panel? I don't know why that would be any different however. Whether I do it at point A or point B they are still connected to the same circuit right?

  • Great question, welcome to Stackexchange! – Harper - Reinstate Monica Jul 11 at 20:17
  • I don’t think you can use bare wire as anything but ground. Too much chance of contacting a ground and that and neutral must not connect except the n the main panel. – DoxyLover Jul 12 at 3:05
  • If you can run a ground wire between the spa disconnect and the first box on the oven/cooktop circuit, can you fit like a 1" ENT between the two? Also, can you post a photo of the breaker for the spa circuit please? – ThreePhaseEel Jul 12 at 18:47
  • I could use conduit, but it would be under my house into a short run of conduit up the wall to the spa panel. My understanding is that THHN/THWN wire doesn't need conduit in a crawl space if it isn't susceptible to damage. Did you want a picture of just the breaker, or the panel opened up? the spa panel is just a single 50 amp GFCI breaker on the outside of my house. Conduit running to the spa, and conduit carying the 4 wires back to my main panel. All 6 gauge copper. – Richard Jul 12 at 21:24
  • Your understanding on thhn / thwn is wrong it requires conduit in a crawl space or wall. – Ed Beal Jul 13 at 17:07

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