Return to the Electrical Wiring Forum | Post a Follow-Up

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?

Follow-Up Postings:

RE: GFI Breaker wiring

You could be looking for a two pole GFCI breaker.

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.

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.

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.

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.

RE: GFI Breaker wiring

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

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).

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Electrical Wiring Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Please review our Rules of Play before posting.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here