I went to check out the power to an AC unit that had been blowing fuses repeatedly. Its disconnect had a burnt fuse clip. I also got some nasty voltage readings to ground. 235, 234, and 0. Not good for an ungrounded 240 delta. Rooftop EMT was kicked apart all over the place, and liberal doses of tar had been applied. Lovely [Linked Image]
I got the keys from a tenant, and headed for the electrical room.


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I was fortunate to find that the circuit I was after was in the C-H board in pic 3.


Now the dilemna would be to find the ground in the system. The only way I can think of is to shut everything off, take voltage readings, and turn services and feeders on one by one until the ground is located, then follow it up the line. I don't think that those old circuit breakers stand a very good chance of turning back on once they're shut off
Any ideas besides the obvious? (Bulldozer, Gas & Match, or maybe just wait for a ground on another phase)


(i forgot a "/")

[This message has been edited by electure (edited 06-16-2006).]