Originally Posted By: dguizzetti
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Here’s a toughie. I put my clamp-on ammeter on the cold water pipe between the cold water ground clamp and the point where the galvanized water line enters the home. I read 1.7 amps. I opened the main disconnect just under the meter on the garage and still read the same amps. I had the utility company pull the meter and still had 1.7 amps on the cold water line. There is no other source of electrical service to the property. Telephone and cable grounds are attached to the ground rod at the meter. Phone ground only shows .2 amps. Where can the ground current be coming from?
I ran across a post somewhere that had a similar case and the current was coming from a unintentional ground in a ungrounded conductor on an electric water heater three houses away. Any ideas? TIA.