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

Peter Parrish peter.parrish at calsolareng.com
Fri Jun 19 11:22:02 PDT 2009


Thanks. One last thing: 690.47(C) has its own set of grounding requirements
(C)(1)-(8). So we need to follow those as apposed to 250-166?

 

- Peter

 

 


 

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


 

  _____  

From: re-wrenches-bounces at lists.re-wrenches.org
[mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of R. Walters
Sent: Friday, June 19, 2009 10:50 AM
To: RE-wrenches
Subject: Re: [RE-wrenches] What is a "direct-current system"?

 

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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