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| Okay, that makes sense, because it is a three-wire ,panel ground and neutrals are one conductor. When you connected the equipment ground for the welder plug, which is which is on a different circuit, you gave the neutral current another path back. I think you are on the right track. The Neutral from the panel back to the transformer must have a high resistance somewhere.
Pretty easy to check that with a voltmeter and a roll of light gauge wire.
Contact me if you want the instructions, I did this all the time on Stray Voltage investigations over the years. | |
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electrical question
