rojay
Senior Member
- Location
- Chicago,IL USA
I had a residential job that I was on years ago, and always wondered about the service grounding.
There were 4 units sitting on a common foundation with each one unit separated by fire walls as well as a separate sprinkler room at the end. The service was a 6 gang meter stack w/ 5 disconnect breakers & one socket blanked off.
Each individual unit was served by a separate water service, so there wasn’t any common water piping between units.
The only grounding electrode for the service was a ground rod at the meter bank. In the individual units the main panel (subpanel, no bonding screw) was located in the garage and we were required to terminate a GEC to the incoming water service pipe and add a supplemental ground rod in the garage below the panel.
It was explained that the basis for this was NEC 250.32, since the firewalls created multiple buildings.
I’ve always been curious about this set up since I’ve typically seen 250.32 cited in reference to separate, completely detached buildings/structures.
Does anyone have any thoughts on this? Is there more than one acceptable way to do it?
There were 4 units sitting on a common foundation with each one unit separated by fire walls as well as a separate sprinkler room at the end. The service was a 6 gang meter stack w/ 5 disconnect breakers & one socket blanked off.
Each individual unit was served by a separate water service, so there wasn’t any common water piping between units.
The only grounding electrode for the service was a ground rod at the meter bank. In the individual units the main panel (subpanel, no bonding screw) was located in the garage and we were required to terminate a GEC to the incoming water service pipe and add a supplemental ground rod in the garage below the panel.
It was explained that the basis for this was NEC 250.32, since the firewalls created multiple buildings.
I’ve always been curious about this set up since I’ve typically seen 250.32 cited in reference to separate, completely detached buildings/structures.
Does anyone have any thoughts on this? Is there more than one acceptable way to do it?