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
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.
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.