Ground is shared by all 3 phases. I've measured between neutral & ground & hot & ground on each of the 3 available phases (at the outlet & breaker box) and all is well.
The Home Depot circuit tester shows all ok as well.
I have not used an oscilloscope on it, that may yield some interesting clues. I shall try that. (I'll have to haul my museum piece of an oscope into work for that one).
Thanks.
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Ground is shared by all 3 phases. I've measured between neutral & ground & hot & ground on each of the 3 available phases (at the outlet & breaker box) and all is well. The Home Depot circuit tester shows all ok as well. I have not used an oscilloscope on it, that may yield some interesting clues. I shall try that. (I'll have to haul my museum piece of an oscope into work for that one). Thanks.