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I am trying to have “cable” installed. The installer clamped on to the “ground” cable on the outside of my building and read 0.5 to 3.3 amps, so he would not install cable until the reading is less than 0.3 amps. I’ve had electricians and the utility company out to try to resolve the problem. They all can’t figure out what the problem is.

There are two “ground” cables coming out of the meter box, one goes to the ground rods, the other to the water pipes. When measured individually there is 0.0 amps on the ground rod line, and 0.3 to 3.3 amps on the water pipe ground side. These two lines are bonded together in the meter panel and are tied together until the ground connected to the water line goes into the house. When the ground on the water pipe is disconnected from the water pipe, both grounds measured from the meter panel read zero. Any ideas?

The Electricians disconnected the cable to the water pipes, the cable read zero. We checked the individual sections of the water pipe, without the cable connected they read zero, with the cable connected each leg read about 0.2 amps. While disconnecting the cable from the water pipes there was no evident spark. All the breakers on the meter panel were disconnected, and the meters were removed one at a time, no significant difference. Turning off the individual breakers in the inside panel makes no significant change. With the water pipe cable disconnected, the ground-rod cable still reads zero. The ground-rod cable connections were checked and both seem bonded well in the ground.
What’s really strange is that both the water-pipe cable and the ground-rod cable are bonded together in the meter panel. Clamping on both cables 12″ below the meter panel they read 0.3 – 2.0 amps. Reading the water-pipe cable at the same point alone reads the 0.3 – 2.0 amps while the ground-rod cable still reads zero. We saw a fluctuation up to 3.3 amps when my refrigerator started, but then goes back to the 0.3 – 2.0 amps on the water-pipe cable.
This is an old (1740) house that was refurbished in the early 80’s. New wiring throughout. The meter panel was replaced about 8 – 10 years ago.
I’ve had three electricians here along with the utility company electrician. So far no-one has an answer.