I have a 100 AMP service entrance. After building the new room addition and hooking up some new curcits, I now have one curcit that I can't shut off. Even the main breaker will not stop the juice. So I am sure that I have a problem, and just wondered if anyone was up on this. Is it possible that there is a grounding problem? Could the ground in the last curcit be picking up this hot stuff? Any ideas?