[RE-wrenches] NEC 690.64 (B) (2)

[David Brearley]

Actually, the article ³Can We Land² by Ryan LeBlanc and Tarn Yates probably
has the best discussion of 690.64(B)(2) issues in particular:

http://solarprofessional.com/article/?file=SP2_4_pg24_LeBlanc&search=

Diagrams 2a & bm for example, should compliment the calculations in the
Hamon article.

DC

On 12/7/10 4:51 AM, "Al Frishman" <amfrish at aeonsolar.com> wrote:

> Wrenches,
> How do you apply NEC 690.64 (B) (2) when you have multiple single phase
> inverters distributed across the 3 phases of an electric-panel via 2 pole
> breakers? 
>  
> Do you simply add up the total of all over-current devices feeding the
> panel (Inverter 2-pole breakers and main breaker) or is there a 3 phase
> formula that gets applied?
>  
> It seems logical that if the single phase inverters are connected with 2-pole
> breakers
> Distributed across the 3 phases then you would take the sum of what is on each
> phase.
>  
> Any and all input on this topic is appreciated.
>  
> Regards,
> Al
> Aeonsolar
> 917 699 6641
>  
>  
> 
> 
> _______________________________________________
> List sponsored by Home Power magazine
> 
> List Address: RE-wrenches at lists.re-wrenches.org
> 
> Options & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
> 
> List-Archive: 
> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
> 
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
> 
> Check out participant bios:
> www.members.re-wrenches.org
> 

David Brearley, Senior Technical Editor
SolarPro magazine 
NABCEP Certified PV Installer 
david.brearley at solarprofessional.com
Direct: 541.261.6545
Fax:  541.512.0343

Visit our Web site at solarprofessional.com

(Sample copy available for download at: solarprofessional.com/sample)



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20101207/6a70e7f2/attachment-0004.html>