[RE-wrenches] What is a "direct-current system"?

[R. Walters]

I just sort of hit this  in a previous post:
check 690.47C(3). Your system falls under (C) AC & DC grounding  
requirements.....
This just shouldn't be that hard with the inspectors....

R. Walters
Solarray.com
NABCEP # 04170442	



On Jun 19, 2009, at 10:55 AM, Peter Parrish wrote:

> I have a LA Dept. of B&S inspector cite Article 690.47(B) “Direct- 
> Current Systems” and its consequent grounding requirements (250.166 
> (A)(B)) in connection with a very straightforward grid tied PV  
> system (i.e. no batteries, just PV and a Xantrex GT inverter).
>
>
> He said that since there is a DC circuit as well as an AC circuit,  
> 690.47(B) applies. I countered that all PV systems have a DC  
> circuit, so to separately call out a “Direct-Current System” must  
> apply to something other than the DC PV circuit inherent in all PV  
> systems.
>
>
> Am I missing something here? Is “Direct-Current System” defined in  
> Article 690? We are working off NEC 2008.
>
>
> Thanks in advance for your help.
>
>
> -          Peter
>
>
> <image003.gif>Peter T. Parrish, Ph.D., President
> California Solar Engineering, Inc.
> 820 Cynthia Ave., Los Angeles, CA 90065
> CA Lic. 854779, NABCEP Cert. 031806-26
> peter.parrish at calsolareng.com
> Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885
>
>
>
> <image003.gif>
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