Grounding a portable generator for house use

mn1247 · 10-20-2010, 09:22 AM

I have a generac XP8000E that I want to connect to my house. I plan to connect its 30A output to the main panel via backfeed through a 30A breaker. An interlock switch will be used for safety.

The manufacturer says that, if I unbond the neutral and ground within the unit, this will void the warranty.

Are there any other grounding strategies I could use? For example, what if I carry the ground from the panel only as far as the house inlet receptacle box, and then provide a separate earth-ground for the generator?

Eric

J. V. · 10-20-2010, 11:26 AM

The 30 amp receptacle on the generator should be four wire. This ground is the only ground you require. Just connect it with the other grounds in the service panel.
Do not disturb any wiring in the generator itself.

mn1247 · 10-20-2010, 07:53 PM

Okay...

But, if the neutral and ground wires are connected together in the generator and also in the panel, they are effectively one single wire. And, the ground may not be at earth potential at the generator (since current is flowing).

True? Am I missing something?

Thanks
Eric

brric · 10-20-2010, 08:08 PM

J.V. is correct. Why do you think current is flowing through the ground?

Speedy Petey · 10-20-2010, 08:13 PM

Quote:

Originally Posted by mn1247

But, if the neutral and ground wires are connected together in the generator and also in the panel, they are effectively one single wire.

Absolutely not. They are definitely two conductors serving two different purposes.

DO NOT disturb the wiring inside the generator. There is also no need or want to install or connect to a ground rod.