1)In an old duplex a lot of existing circuit feeds are 12-3.I used one of them for kitchen
counter receptacles;the problem is when using a GFI tester both GFI'S pop.Is this usual, legal; is because of shared nuetral?
2)AFI similar problem-I think previous sparky
tied noodles in attic JB;result is that one or the other AFI will hold, but turning 2nd
AFI kicks off the first one; will shared nuetral do this ?