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Standby Generator Grounding

Merry Christmas
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cwsnsons

Member
I have a job coming up that includes installation of an automatic standby generator for a residence. The POCO doesn't know how the grounding should be done and when I asked the AHJ when he came for an inspection at another job, he wasn't sure how it should be done.

Does anyone know of any previous topics that would shed light on this. Or of specific code sections that give direction in what is required?

This is a 400A Service going to 2 200A overcurrent protected disconnects on the outside of the building. One disconnect is to feed specially designated circuits that will be backed-up by the generator through an automatic transfer switch. The two disconnects then feed to their loads through two separate panels.

Does the generator require a separate ground rod, and if so does that bonding wire run to the service ground rod too?
 

roger

Moderator
Staff member
Location
Fl
Occupation
Retired Electrician
Re: Standby Generator Grounding

Chris, this is a good thread to start with, and then do a search for "generator grounding" or "SDS grounding"

You will get more than you really want. ;)

This grounding hinges on whether the system is considered an SDS or not in the eyes of the NEC

Roger

[ December 30, 2003, 12:55 PM: Message edited by: roger ]
 

dereckbc

Moderator
Staff member
Location
Plano, TX
Re: Standby Generator Grounding

Chris as Roger stated it all depends on whether or not your neutral will be switched or not. Figure that out and you will get answers.
 
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