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scross4

05:32AM | 05/14/07
Member Since: 05/13/07
1 lifetime posts
Bvelectrical

how to install GFCI protection on multiwire branch circuits

Tags: Electrical & Lighting
I have installed a 20 amp double pole breaker using 12/3 wire in alternating series in my kitchen. I am trying to install GFCI protection to both sets of receptacles, but I am having a problem where any outlet that is off series of the first GFCI trips the GFCI only when something is plugged in (tester works fine) (example: GFCI set to black wire, all red wire outlets trip the GFCI when used) I have tried installing a second GFCI in the alternate series with no luck. I know it has something to do with the shared neutral, but I am not sure how to correct the problem so that I have GFCI protection on all outlets. Any help would be greatly appreciated. Also let me know if I need to clarify any points

househelper

07:55AM | 05/14/07
Member Since: 03/31/05
265 lifetime posts
At the first GFCI receptacle you will have 12/3 in, 12/2 out to the next GFCI (other circuit) and 12/2 out to the first protected receptacle on circuit one. Connect the black from the 12/3 to the line hot side of the GFCI and a short piece (6 in) of white wire to the line neutral side of the GFCI. Connect the white wire of the 12/2 going out to the next GFCI (other circuit) to the white from the 12/3 AND to the short pigtail. Connect the black of the 12/2 to the red from the 12/3.

For the 12/2 going to the protected recptacles on circuit 1, connect the black to the load hot and the white to the load neutral.

Billhart

06:14PM | 05/14/07
Member Since: 04/25/05
1915 lifetime posts
One is to "split" the circuit at the first box and go to 12-2 as was mentioned.

The 2nd way is to use a 2 pole GFCI breaker.

The last way is to install a GFCI receptacle at each location and not use it to feed downstream.

joed

07:05AM | 05/16/07
Member Since: 09/17/02
524 lifetime posts
You can not share the neutral on the LOAD side of the GFCI. You must either use a double pole GFCI breaker or separate the circuit at the first receptacle LINE side into two circuits each using there own neutral.
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