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interesting

Please detail a bit more. From your description, it sounds like he used a 10/3 cable. I've seen 12/3 in my house, and I installed a run of 8/3. Both have a ground wire, a neutral wire, and two hots..a red wire, a black, a white, and either green or copper ground.

If this is the case, then they are sharing a common neutral. If you put one amp on each hot leg, then there will be no neutral current.

If this is the hum cause, it will only get worse when the amps are being used, as the draw will be some glorious (hideous) combination of neutral currents and hot currents..

If you have him switch both legs to the same side of the service, then the neutral currents will be the sum of the two hots.

I'd have approached it the way Ted Smith's setup was done, wires in conduit with a honker ground run for the whole shebang (If I recall correctly). But you should ask him, as it's been a while since we discussed it.

Cheers, John

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