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?