690.47 (was Enphase) [RE-wrenches]

[Ray Walters]

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I had a question regarding the 2008 version of 690.47. It looks like  
a lot of changes occurred. 690.47 (D) seems to require a separate  
grounding electrode at the inverter and array if located more than 6  
ft from the premises ground. But the wording is unclear to me: is  
this required? or does this section merely cover supplemental  
grounding if you choose to do so?
690.47 also appears to have removed the limit on not having to use  
larger than #6 for the GEC. My read is that with a DC breaker rated  
at 250 amps, we would now have to use #4 if we were bonding to a UFER  
ground (250.166 (D)

THanks for your clarification in advance,

Ray Walters


On Jun 12, 2008, at 11:00 PM, Bill Brooks wrote:

>
> 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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R. Walters
Solarray.com
NABCEP # 04170442	




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