I jjust failed a service upgrade inspection and I need some opinions. The service went from 100 amps to 200. The existing grounded electrode conductor goes directly to a driven ground rod using number 6 copper and aanother ground wire using 4 aluminum goes to the water pipe. the water pipe goes to a meter and is connected to PVC pipe that goes into the concrete basement floor. The AHJ wants the wire going to the water pipe to be sized according to 250-66 because he states that the water pipe is a grounding electrode and the rod is a supplemental ground. He also wants a jumper around the water meter. My contention is that according to 250-52 the water pipe is not an electrode unless it is in contact with the earth for 10 feet. I considered the ground rod the grounding electrode and used and the water pipe as stated in 250-104. Not that it matters since it is an easy fix and he is the AHJ, but I would like to know where if at all I went wrong. Thanks for any and all replies. Tom
- posted
18 years ago