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<TITLE>Re: [RE-wrenches] NEC 690.64 (B) (2)</TITLE>
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<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>Actually, the article “Can We Land” by Ryan LeBlanc and Tarn Yates probably has the best discussion of 690.64(B)(2) issues in particular:<BR>
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<a href="http://solarprofessional.com/article/?file=SP2_4_pg24_LeBlanc&search=">http://solarprofessional.com/article/?file=SP2_4_pg24_LeBlanc&search=</a><BR>
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Diagrams 2a & bm for example, should compliment the calculations in the Hamon article.<BR>
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DC<BR>
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On 12/7/10 4:51 AM, "Al Frishman" <<a href="amfrish@aeonsolar.com">amfrish@aeonsolar.com</a>> wrote:<BR>
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</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><FONT COLOR="#1F497D">Wrenches,<BR>
How do you apply NEC 690.64 (B) (2) when you have multiple single phase <BR>
inverters distributed across the 3 phases of an electric-panel via 2 pole breakers? <BR>
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Do you simply add up the total of all over-current devices feeding the <BR>
panel (Inverter 2-pole breakers and main breaker) or is there a 3 phase <BR>
formula that gets applied?<BR>
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It seems logical that if the single phase inverters are connected with 2-pole breakers<BR>
Distributed across the 3 phases then you would take the sum of what is on each phase.<BR>
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Any and all input on this topic is appreciated.<BR>
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Regards,<BR>
Al<BR>
</FONT>Aeonsolar<BR>
917 699 6641<BR>
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