How can I determine which neutral in a sub-panel is for a particular (tripped) breaker? We have a sub-panel in the basement for circuits that are supplied by an automatic generator. There are eight breakers in that box, and seven neutral wires on the bar, none of them labeled. (I think one slightly larger wire is for a ganged pair of breakers.)
I've tried disconnecting several of the wires, one at a time, but when I try to reset the breaker, it trips again. Could it be shorting to the bar in general, rather than to its associated neutral? I think there may be a hot-to-neutral short somewhere in the circuit, but I need to isolate the correct neutral before further testing. Something tells me it could involve shutting off all eight breakers in that box, and maybe disconnecting the generator so it doesn't fire up (or at least not supply any juice) when I open the main breaker.