Usually in old houses, I find that the metal device boxes are grounded and that it's relatively easy to upgrade to grounding receptacles. HOWEVER, today I came across ungrounded steel boxes. The old romex either did not have a ground because I cannot see one and the bx is not grounded either. What struck me funny was that I measured approx. 60 VAC between the ungrounded conductor and the steel device box. With the supply breaker open, I measure infinite resistance between the device box and the grounded neutral conductor. I can't make sense of the 60 volt reading. Can anyone explain?
The box in question is above a basement with an exposed copper water pipe so I plan to run a grounding conductor between it and the box.
I guess I had a pretty good run with old houses until now. This one also likes to ruin my holesaws and sawblades with it's concrete walls.
Don
