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

Peter Parrish peter.parrish at calsolareng.com
Fri Jun 19 09:55:23 PDT 2009


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

 

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


 

 

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