I'd avoid using the metal conduit as the only bond in your equipment grounding
from the roof down to other equipment. If the GEC is bonded to the rest of the
equipment grounding system at a point on the ground, then of course it can
double as the EGC. Otherwise, if you don't want to use a separate EGC
conductor, better to split-bolt or splice by another means from the GEC once
you're on the ground and run an EGC back to busbar in the equipment grounding
system.
Jeffrey Quackenbush
NABCEP-certified PV installer
Ninja Solar
________________________________
From: Allen Frishman <[email protected]>
To: RE-wrenches <[email protected]>
Sent: Tuesday, December 6, 2011 1:59 PM
Subject: [RE-wrenches] GEC and EGC Advice
Fellow Wrenchers,
I know this topic has come up before and I have a understanding but I am
looking for best practices advice.
When installing a 50KW or larger 3 phase 208V (WYE Service) Inverter on a roof
do you run your Grounding Electrode Conductor in a separate conduit from the 3
hots, and the Equipment Grounding Conductor or do you run it all in the same
conduit together.
My thought is to run it all in the same conduit and utilize the metalic conduit
as the Equipment Ground instead of running a actual conductor for the EGC.
All feedback is appreciated.
Al Frishman
AeonSolar
(917) 699-6641 - cell
(888) 460-2867
www.aeonsolar.com
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