Standy-by gen

[Twoskinsoneman]

I'm our vehicle systems I design, we never have a problem with parallel return paths becuase our Neutral bus and Ground bud in the panel are isolated. It acts as a sub panel and the Generator has the Neutral and ground combined. Or in the case of shore power, the Neutral and Ground our combined at the main panel you are getting power from.

Anyway my question is this, when you guys wire up a stand-by gen in a residence won't there be parallel return paths if the gen has a combined Neutral-Ground and the panel has combined Neutral-ground bus. In fact as I look around the web I see most places you only need a two pole switch and the Neutral is wired straight to the Neutral bus. Wouldn't this provide multiple return paths.

Thanks

 

[hillbilly]

When a 2 pole transfer switch is used on a stand-by generator system for a residence, the bonding jumper between the ground and neutral on the generator is removed.

The generator frame is grounded with a equipment grounding conductor.
The generator neutral is not switched and is bonded to the Service Ground at the Main Disconnect.


This is not a Seperately Derived System (SDS).
Read 250.20(D) FPN No. 1

Just a opinion
Hope this helps

steve