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Re: Voltage on grounding cable
Eric,
That, 11 amps, is A LOT.
The first thing, and simplest thing, to do is to monitor the ammeter while flipping breakers off. With each breaker that makes a difference, put a piece of painter tape next to it and write down the difference it made.
There may be a multitude of problems on several circuits, or just one circuit, in which case the correction is easy - trace that one circuit out and find and fix the problem.
If all breakers effect the reading, I would start looking at what is common to all circuits, such as the neutral and its connections.
Don't forget, older ranges and dryers had the neutral serving as the grounding conductor.
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