greenspark1
Senior Member
- Location
- New England
Hi.
Here's the scenario- doing some significant renovations on a small separate building. Of course no existing plans/drawings. The building has two three phase feeds (<600V) to separate panels, each with its own EGC. We are relocating one panel and adding breakers to both.
Part 1- Per NEC 250.32, we need to add a grounding electrode system. A grounding rod will probably be easiest. Then we can tie the ground rod to the EGC at panel 1. Can we also tie panel 2 to the same ground rod? I believe the NEC allows this second connection (250.30(6)), but I haven't run into this scenario before. I'll also bond to the building steel to ensure it's grounded. How long ago did this requirement for a GES at a separate building enter the Code? Many electricians seem not to know about it.
Part 2- there is a lot of metal process piping in the building- cold water, steam, etc. It should all be bonded per NEC 250.104 in case it accidentally becomes energized.
Thanks for any insight.
Jay
Here's the scenario- doing some significant renovations on a small separate building. Of course no existing plans/drawings. The building has two three phase feeds (<600V) to separate panels, each with its own EGC. We are relocating one panel and adding breakers to both.
Part 1- Per NEC 250.32, we need to add a grounding electrode system. A grounding rod will probably be easiest. Then we can tie the ground rod to the EGC at panel 1. Can we also tie panel 2 to the same ground rod? I believe the NEC allows this second connection (250.30(6)), but I haven't run into this scenario before. I'll also bond to the building steel to ensure it's grounded. How long ago did this requirement for a GES at a separate building enter the Code? Many electricians seem not to know about it.
Part 2- there is a lot of metal process piping in the building- cold water, steam, etc. It should all be bonded per NEC 250.104 in case it accidentally becomes energized.
Thanks for any insight.
Jay