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#87089 - 01/20/04 01:29 PM grounding sub-panels
slee Offline
Junior Member

Registered: 01/20/04
Posts: 1
Need some guidance please. When installing an electrical distribution system, what is the requirement for grounding the sub-panels? Are we required to drive a ground rod for each sub-panel? I think not. I've always been taught/told to bond the sub-panels to the service entrance using a grounding conductor sized for the sub-panel's feeder circuit, and the service entrance is connected to the ground rod, but I can't find the reference in the 2002 NEC. Is there one?

Any help is appreciated.


2014 / 2011 NEC & Related Books and Study Guides
#87090 - 01/20/04 02:36 PM Re: grounding sub-panels
rmiell Offline

Registered: 11/09/00
Posts: 261
Loc: La Junta, Co. USA
See Article 250 for all the rules for this type of grounding.

Rick Miell

#87091 - 01/20/04 08:31 PM Re: grounding sub-panels
russ m Offline

Registered: 02/22/03
Posts: 165
Loc: Burbank,IL,USA
Is the sub panel in the same building?
Is it fed with a metalic conduit?

If yes, yes, your done.
If yes, no, Pull a equipment ground sized to 250.122, and do not bond the neutral to the ground in the sub panel.
Terminate the EGC to a lug or ground bar bonded to the panel


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