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Depends if they are matched in phase and amplitude. Had a case recently where a house was miswired. There was an outlet that was connected to two breakers. I was trying to trace down a problem with a GFCI continually tripping. The clue was that as I turned off breakers one at a time, the power never went off at the input to the GFCI. When I removed the extra feed (It was in a different outlet box) the problem was fixed. It only affected the GFCI and the other things on the circuit worked. If was obviously a code violation and a bad implementation, but it "worked" in some sense.

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14y ago

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