A friend of mine who owns a restaurant mentioned that the copper water was turning black and a few of his refrigerators had damaged copper lines requiring replacement. His flat screen TV's had been damaged as well, the TV technician opened the set and asked why the interior was black, (burnt)!
This may be similar to the problem experienced by this gentleman in Tennesee. I noticed a few important issues concerning the grounding of his service. First, the ground clamp on the water main was loose, a current reading on the grounding conductor was 11-13 amps! Further investigation revealed an undersized service grounding conductor and taps off this undersized grounding conductor to other service switches. This situation caused significant damage to all the copper connections in this restaurant. I am sure this similar situation exists with this gentleman's house. Kein J Breen
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