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GFI Breaker wiring

Posted by randy427 (My Page) on
Tue, May 25, 10 at 22:06

I'm having an electrician swap out my FedPac panel for a GE(commercial, 3 phase instalation). In doing so, he didn't notice that two GFCI breakers were connected to the same 12-3 cable until he was installing the breakers and came up one neutral short. I thought it was impossible, but they worked before though we can't figure out how with a common neutral. The only thing I can think of, is when some previous owner went from a standard breakers to GFCIs, he ran a bootleg neutral for the second circuit.
We'll be trying to chase this down tomorrow. Does anyone have any other ideas what we could be looking for?
TIA
R3


Follow-Up Postings:

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RE: GFI Breaker wiring

You could be looking for a two pole GFCI breaker.


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RE: GFI Breaker wiring

It's also possible that it didn't work before with loads plugged into both sides of thw MWBC or whatever you've got here.


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RE: GFI Breaker wiring

Thanks for your replys.
They both worked fine before, including the Press-To-Test function. They are lighting circuits that were always used at the same time.
The original breakers were single poles and wired with type NM cable.
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RE: GFI Breaker wiring

Is your three phase a delta or Y setup? Delta setup has some odd things happen with the neutral. You have to really know what you are doing. I don't don't know enough to be of more assistance than to to say you need an expert.


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RE: GFI Breaker wiring

Thanks for your comments.
It's a standard Y configuration as most of the equipment is 120v. After a couple hours of tracing cables, we found the bootleg common that I suspected was there. I may be a lifetime DIYer, but I don't think I'm quite as clueless as the clown that did this one.


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RE: GFI Breaker wiring

Mr.Clue, does this mean that you have purchased and installed the required two pole gfci breaker?


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RE: GFI Breaker wiring

Not applicable.
What we had to do was to have the hot and neutral in the same cable rather than the hot in one 12/3 cable and the neutral 'bootlegged' in another 12/2 cable (where the black was not used).


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