Hi,
I need an instrument to find which circuit breaker a three phase 220V motor is conected in a remote power distribution panel. This is to build a single wire electric diagram of an industrial plant.
I have seen an advert for just that sort of piece of kit. Basically a high frequency is injected at the motor terminal while its live and a tracer sort of probe is used at the far end to filter out the high frequency and indicate which conductor its on. I can't remember who made it. If you are considering doing it your self, the mains can be lethal!! :-(
Frank