hi,
anytime i have ever tried to use a GFI that shared a neutral with another circuit the GFI trips.
how do you wire a 3 wire circuit with gfi's so that it will not trip? it works fine until you turn on a device on the OPPOSITE circuit. it may work if everything slaves of the gfi..?
as far as voltage drop and multiwire circuits goes, it is easier to use a number 10 than a number 12 than to install a multiwire circuit to account for voltage drop.
less time, less material, less confusion.
-regards
frodo
