[AMPS] ground loop?
Tue, 23 Oct 2001 17:54:14 -0700
>This is a puzzling situation here in the shack. I have a 117 volt
>receptacle that shows a voltage reading of 117 when I measure between
>the ground hole and hot water register in the room. Obviously, this is
>a dangerous situation.
>When I checked out the receptacle, I found that there wasn't any ground
>wire connected to the box(old wiring, new 3 prong receptacle added by
>previous owner). I ran a ground to a cold water pipe nearby and voltage
>between ground and radiator disappeared. I was happy with my success
>until I turned out a lamp that was on in the shack and the breaker
>popped. I removed the new ground wire and reset the breaker and now
>we're back to where we started. Any suggestions?
// The white wire is usually the neutral. All of the neutral wires
connect back to the ground of the breaker box. You can confirm this by
measuring the potential to a ground. Although it's not according to
code, when no ground wire is available, connecting the outlet's ground
terminal to the neutral terminal holds the ground to no more than a few
volts max. above gnd.
- R. L. Measures, 805.386.3734,AG6K, www.vcnet.com/measures.
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