About 10 years ago we had a new meter-main installed upgrading to 200A service from 100A at a new service entrance location (closer to the street) for a 1951 daylight ranch house. At the time they ran a new earth ground (#6, I think?) to at least one location.
Recently I found an old #12 earth ground connected to a rod on the opposite side of the house from service entrance. I tested it with a current clamp with only 0.001 A is flowing, so far so good. Who knows if there are any other grounds around that I've not yet discovered.
What would be best, and why?
- Leave it as is?
- Disconnect it?
- Run a bigger ground to this newly discovered earth ground?