Questions for Enphase Reps [RE-wrenches]

[Mark Frye]

Bill,

I think the reference in 690.47(C)(3) to GFP allows the EGC and the GEC to
be the same conductor, but the size of the conductor is still controlled by
690.47(C)(7).

It is getting hard to keep these versions straight but for NEC 2008 with
regard to the DC system of the Enphase (or other inverter) NEC 2008 690.47
(C)(7), "Ground electrode conductor(s) shall be sized to meet the
requirements of both 250.66 (ac system) and 250.166 (dc systems).

NEC 2008 250.166 (B), "...the grounding electrode conductor shall not be
smaller than...8 AWG copper."
 
Mark Frye
Berkeley Solar Electric Systems
271 Vistamont Dr
Grass Valley CA 95945
(530) 401-8024
www.berkeleysolar.com 


-----Original Message-----
From: Bill Brooks [mailto:billbrooks7 at yahoo.com] 
Sent: Thursday, June 12, 2008 10:00 PM
To: RE-wrenches at topica.com
Subject: RE: Questions for Enphase Reps [RE-wrenches]


The 2008 NEC allows sizing of combined GEC and EGC to be same size as EGC in
690.47(C) in an inverter with GFP. Whether it should be allowed or not is
another issue. In California, using the 2005 NEC, 8AWG is the smallest GEC
allowed.

Bill.

-----Original Message-----
From: Drake Chamberlin [mailto:Drake.Chamberlin at redwoodalliance.org]
Sent: Thursday, June 12, 2008 9:10 PM
To: RE-wrenches at topica.com
Subject: RE: Questions for Enphase Reps [RE-wrenches]


Hello Bill,

At 06:27 PM 6/12/2008, you wrote:
>Depending on the version of the NEC your are using, it is possible to have
a
>combined dc GEC and ac EGC that is as small as 14 AWG

I'm glad to get your confirmation about this.   Although this seems 
to be accepted by our inspectors, I'm not sure why we are allowed to 
have an GEC smaller than #8.  How does that work?

Thanks,

Drake  


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