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Kenyon, MN
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Lafayette, Louisiana
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 Two circuits - Single neutral & GFCI
[#2] Posted: 06/22/2012 - 2:40:51 PM |  |  |
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GFCI's won't work on a multi-wire circuit. If it isn't a multi-wire, then try another GFCI on that 20A circuit. I've had some that were defective right out of the box.
You're dealing with ungrounded circuits, right?
Marc
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"If Guam gets too overpopulated, it might tip over."
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LaPorte, IN
Posts: 14
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Two circuits - Single neutral & GFCI
[#3] Posted: 06/22/2012 - 6:33:55 PM | | |
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If done properly, GFCI's definitely work on MWBC's.
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Victoria, British Columbia
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Two circuits - Single neutral & GFCI
[#4] Posted: 06/22/2012 - 9:29:09 PM | | |
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You have 2 hot wires going to each outlet. You've removed the 20 amp jumpers at all the countertop outlets, right? That same 20 amp circuit still goes to the outlets but with no terminations and now supplies power to the dishwasher, disposer and fridge? I would pull all that wiring out and check all connections. It sounds like there is a fault.
In my area, kitchen GFCI's are 20 amp. If your wiring is all #12 copper, I don't know why you've installed a 15 amp GFCI.
I would invest in a couple of fish tapes and pull some new wire in behind the cabinets.
Don't mess with the subpanel neutrals. Get an electrician to check that out, or post some 800 X 600 pixel pics here, and we can help sort it out.
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Gaston, Oregon
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Gaston, Oregon
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Two circuits - Single neutral & GFCI
[#6] Posted: 06/26/2012 - 6:14:37 PM | | |
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Original Poster:
You've made a mess. Call an electrician to clean it up for you.
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Jim Katen, Oregon
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Lafayette, Louisiana
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Two circuits - Single neutral & GFCI
[#7] Posted: 06/26/2012 - 6:35:38 PM | | |
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Quote: Originally posted by Jim KatenQuote: Originally posted by brric
If done properly, GFCI's definitely work on MWBC's.
No. They don't. A GFCI works by detecting an imbalance in the current between two conductors. With a multi-wire branch circuit, there will - by definition - be an imbalance every time one side of the circuit is used. If the GFCI is working properly, it will trip as soon as you use current on either side of the circuit.
I forgot to mention that my comment applies only to GFCI's breakers installed on a multi-wire circuit.
If it's a GFCI receptacle we're speaking of then it will work on multi-wire circuits because the imbalance that the device looks for is between the two currents within the receptacle itself.
Marc
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Gaston, Oregon
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Two circuits - Single neutral & GFCI
[#8] Posted: 06/26/2012 - 7:57:49 PM | | |
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Quote: Originally posted by MarcQuote: Originally posted by Jim KatenQuote: Originally posted by brric
If done properly, GFCI's definitely work on MWBC's.
No. They don't. A GFCI works by detecting an imbalance in the current between two conductors. With a multi-wire branch circuit, there will - by definition - be an imbalance every time one side of the circuit is used. If the GFCI is working properly, it will trip as soon as you use current on either side of the circuit. I forgot to mention that my comment applies only to GFCI's breakers installed on a multi-wire circuit. If it's a GFCI receptacle we're speaking of then it will work on multi-wire circuits because the imbalance that the device looks for is between the two currents within the receptacle itself.
Only if he wants to use pigtails and put a GFCI receptacle at each and every location where a receptacle serves the countertop. If you try to feed the circuit *through* the GFCI, it won't work.
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Jim Katen, Oregon
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Chestertown, MD
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Two circuits - Single neutral & GFCI
[#9] Posted: 06/27/2012 - 2:37:55 PM | | |
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The neutral of the MWBC just needs to be spliced ahead of the first GFI. You would then feed xx-2 to any of the downstream receptacles.
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LaPorte, IN
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Gaston, Oregon
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Two circuits - Single neutral & GFCI
[#11] Posted: 06/27/2012 - 6:43:29 PM | | |
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Quote: Originally posted by brricQuote: Originally posted by Jim Port
The neutral of the MWBC just needs to be spliced ahead of the first GFI. You would then feed xx-2 to any of the downstream receptacles.
Exactly, Jim. Have done it hundreds of times.
Good point. Thanks.
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Jim Katen, Oregon
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