[RE-wrenches] GEC and EGC Advice

[James Rudolph]

Allen,

As far as best practices go, I would route all those conductors and GEC/ECG
in the same raceway."  To maintain the shortest electrical time constant in
each circuit, the ECG should be routed as closely as possible to the
circuit conductors. This routing facilitates the operation on over-current
devices"(2011 Nec Handbook). And as far as safety goes I would never rely
on the continuity of the conduit to be my EGC. What if it seperatres some
how due to thremal expansion or some other unforeseen calamity? I do think
SolarPro just ran a great grounding article recently too in regards to the
2011 code changes.
There is also a provision in 690 to combine the EGC&GEC into one conductor
(690.47(c)(3).

I hope this helps,




On Tue, Dec 6, 2011 at 3:29 AM, Allen Frishman <amfrish at aeonsolar.com>wrote:

> 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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-- 
*James B Rudolph
NABCEP Certified PV Installer

*
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