I'm armpit deep in a kitchen rennovation. I am planning to add a 20Amp-T-slot GFCI duplex receptacle on either side of the sink. I've run 12/3 to the first outlet, and 12/3 to the second outlet. I was planning feeding each GFCI from the different legs of the multiwire circuit.
Homer has posted in another thread:
"You can't protect both legs of a multiwire circuit with two GFCI receptacles.....however if you split the multiwire circuit into two circuits where the neutral is no longer shared, then you can protect those two circuits with one GFCI receptacle on each circuit. So, you can run one 3-wire multiwire circuit into the first box, and splice into two 12/2 or 14/2 cables so the neutral is no longer shared. These two circuits can then be protected by GFCI receptacles."
I'm having trouble to conceptualize how this is different from a shared neutral situation. Isn't it still a shared neutral?