Residential GFIs Constantly trip

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Npstewart

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New construction house, not even 1 week old. For some reason all the GFI circuits are tripping constantly. Kitchens, restrooms, etc. My information is limited at this point, just trying to help someone out. Any ideas from the experienced electricians on this forum?
 
Npstewart said:
New construction house, not even 1 week old. For some reason all the GFI circuits are tripping constantly. Kitchens, restrooms, etc. My information is limited at this point, just trying to help someone out. Any ideas from the experienced electricians on this forum?
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Extra bond between ground and neutral somewhere in the wiring? Incorrectly wired GFCI in MWBC?
Are these GFCI breakers or receptacles or a combination?
 
These are all GFI receptacles.

Are you suggesting to add an additional bond at the service entrance before the sub panels?
 
Npstewart said:
Are you suggesting to add an additional bond at the service entrance before the sub panels?
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I think he's suggesting that the neutral and ground may have been connected after the GFCI devices, as that would split the neutral current between the neutral and ground wires -- line and neutral currents are no longer balanced, and GFCI trips. If that's the case, I would suggest having whoever you're helping out think long and hard about who they hired to do the installation. Any electrician worth his salt ought to know better.

Are you able to reset these GFCI receptacles and then they trip when you plug something in, or are you not even able to reset them?
 
Its funny, thats exactly what I was thinking originally.

This house has one main panel with subpanels feeding other subpanels, none of which should have a neutral/ground bond.

I am finding out more information but I believe they reset and trip intermittently but not instantly.

I will post a conclusion.
 
Npstewart said:
...all the GFI circuits are tripping constantly.
Kitchens, restrooms
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Hypothetical answer, in the absence of more information.
Assume you have a MWBC, phase A & B & N.

If you attach GFCI Rec onto MWBC (A & N) , and pull a load,
then the neutral is shared between the two phases ( A & B ).

Since the load on phase A & N is in use,
when you add a load on phase B & N,
the GFCI may sense an imbalance on its own circuit A & N, and trip.


If you supply more info,
then you get more answer.
 
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