So I am doing some repairs at a facility powered from permanent generators. There is 2 separately connected generators to a transfer switch so they operate independent from eachother for downtime for maintenance and whatnot. Obviously from the generator they hit a Main panel. I am slightly confused on the correct way to run all the grounding/bonding as there is more than one answer that i am coming up with. Any input would be appreciated.
Grounding & bonding for service fed from 2 generators
- Thread starter R.f.
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Either one neutral-ground bond is made at or after the T/S, with the source neutrals floating, or each source's neutral is bonded, and the load neutral floats.
I guess I should have added that it is a 4-pole transfer switch so I am not concerned with the neutrals. My co-worker was pointing out that doing all the bonding in the main panel and running an equipment grounding conductor back to the transfer switch and then from the transfer switch to both generators could create some weird loop where an instance if one generator was running and the other generator was being worked on he says it could increase the chances of a possible fault making its way to the generator being worked on. He brings up the point of treating both generators like a utility and grounding them separately, then just running the hots and neutrals to the service and installing the electrode grounding conductor and bonding jumpers in the main panel just like normal. He is suggesting not running an equipment grounding conductor between the generators and transfer switch. he brings up a valid point but still leaves me a little concerned.
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