farm! We used to have have two houses on different electric feeds that
had common galvanized pipe plumbing. This was very problematical with
respect to the use of cold water pipes as electrical grounds.
I had an unusual situation of voltage between water coming out of the
faucets, and ground.
Turns out the electrical grounds/neutrals were bad (since installation
in 1979), and the return paths for two 120V 100A feeds was up the water
in a PVC pipe back into the well.
Kurt
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