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Old 10-13-2012, 07:10 PM   #1
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will this GFCI method work


Will this kind of shared neutral for the line-load side of the GFCI work? Basically I want to run 12-2 from breaker to a junction box. Then run a 12-3 to a separate location with the GFCI using the red on the 12-3 for protecting downstream load outlets. Not sure about the same neutral being shared from the 12-3??? See drawing
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Old 10-13-2012, 07:18 PM   #2
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will this GFCI method work


Why a juntion box and not just run the wires to the reguler outlet , add a line to the GFI line side then run the load side to whatever it is your trying to protect.
The way you drew it makes no since doing it that way to me.

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Old 10-13-2012, 07:21 PM   #3
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will this GFCI method work


Won't work. Can't share neutral.
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Old 10-13-2012, 07:23 PM   #4
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will this GFCI method work


Bingo, Did you read my suggestion Glenn?
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Old 10-13-2012, 07:24 PM   #5
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will this GFCI method work


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Why a juntion box and not just run the wires to the reguler outlet.
Because the 12-2 from the panel will be run to the junction box first. I understand that the ideal way is to run the 12-2 from the panel to the box with the GFCI without a junction box but that wasnt my question.
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Old 10-13-2012, 07:25 PM   #6
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will this GFCI method work


The way it is drawn will not work.
What are you trying to do?
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Old 10-13-2012, 07:26 PM   #7
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will this GFCI method work


That will not work. The line & load neutrals need to be separate. The GFCI outlet works by measuring the current on the hot & neutral, and if there is a difference it will trip. By wiring it that way, the neutral from the second outlet will bypass the gfci, and trip it as soon as you plug anything in to it.

You will have to run 2 12-2's from the jb to the gfci.
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Old 10-13-2012, 07:27 PM   #8
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will this GFCI method work


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The way it is drawn will not work.
What are you trying to do?
Trying to eliminate having 2 two 12-2 cables at the GFCI location. One 12-2 bringing the line in and one 12-2 taking the load out to a nornal duplex. But if the 12-3 will not work I have no choice
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Old 10-13-2012, 07:28 PM   #9
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Originally Posted by dawizman View Post
that will not work. The line & load neutrals need to be separate. The gfci outlet works by measuring the current on the hot & neutral, and if there is a difference it will trip. By wiring it that way, the neutral from the second outlet will bypass the gfci, and trip it as soon as you plug anything in to it.

You will have to run 2 12-2's from the jb to the gfci.

good explanation. Case closed. Thanks to all

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