Acme super circuit breaker locater.
I say that with a tremble in my voice:grin:
I remember a time about 15 or so years ago when a guy I was working with used a piece of #12 wire like that in an attempt to locate a breaker at a print shop, he rammed the wire into the plug where massive sparks and smoke begin to emit from the receptacle, he pulled the now shorter wire from the receptacle, looked at me with an evil grin and rams it back into the receptacle. I think he truly enjoyed sparks and smoke, an elctropyromaniac if you will. All this time I am seeing spots from the flash. He tries again this time it is worst and he only ends up with a short piece of the wire, the rest of it had adhered to his needle nose like a garage built electroplating machine did it. He looked at me and said, what the heck man. I later located the circuit breaker it was on, it was tied into a 2 pole 100 amp FPE breaker, of course it was not tripped.