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Electified Cold Water Lines
While changing a pedestal sink in an old house ,I noticed what I thought was a ground line attached to the cold riser with a clamp. When I disconnected the line all the lights in the 2nd floor went out. Turns out they were using the cold water line as a neutral back to the basement and electric box. This was an old house with two wire electric with no ground , I think they hooked it back up when I left because they balked at my suggestion that they should call an electrician . JUST WHEN YOU THINK YOU HAVE SEEN IT ALL , George