Thanks Joe, can't figure out how to start a new thread. I have a 2 unit apt building. All inside wiring is ungrounded 2 wire system. 2 meters and mains outside, fairly new and grounded. 1 unit has 2-50A 2p breakers feeding a sub panel, all screw-in fuses and a range. If I replace the 50A 2p with a 50a 2p GFI Breaker feeding the sub panel, will it protect the circuits inside or will I have to install gfi outlets or outlet with feed thru capabilities if I can figure out the wiring inside. Any help would be much appreciated.
Last edited by billy6139; 10/16/13 12:14 AM.
