<HTML>
<HEAD>
<TITLE>Re: [RE-wrenches] NEC 690.64 (B) (2)</TITLE>
</HEAD>
<BODY>
<FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'>SolarPro also published an article on this subject, written by Marvin Hamon, PE, entitled “Calculating 3-Phase Line Currents.” Subscribers can access the HTML version of the article at the URL below or click the “PDF Version” link on that page to download the article as it appeared in the magazine: <BR>
<BR>
<a href="http://solarprofessional.com/article/?file=SP3_1_pg66_Hamon&search=">http://solarprofessional.com/article/?file=SP3_1_pg66_Hamon&search=</a><BR>
<BR>
Best regards,<BR>
<BR>
David Brearley, Senior Technical Editor<BR>
<I>SolarPro</I> magazine <BR>
NABCEP Certified PV Installer ™<BR>
<BR>
<BR>
On 12/7/10 8:47 AM, "Glenn Burt" <<a href="glenn.burt@glbcc.com">glenn.burt@glbcc.com</a>> wrote:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><FONT COLOR="#1F497D">Al,<BR>
<BR>
SMA has a good whitepaper on their site covering this, and there was an article in a recent Solar Pro covering this topic as well…<BR>
Good Luck!<BR>
Glenn Burt<BR>
<BR>
</FONT><BR>
</SPAN></FONT><FONT SIZE="2"><FONT FACE="Tahoma, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:10pt'><B>From:</B> <a href="re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <B>On Behalf Of </B>Al Frishman<BR>
<B>Sent:</B> Tuesday, December 07, 2010 5:51 AM<BR>
<B>To:</B> <a href="re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><BR>
<B>Subject:</B> [RE-wrenches] NEC 690.64 (B) (2)<BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'> <BR>
<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>
<BR>
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>
<BR>
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>
<BR>
Any and all input on this topic is appreciated.<BR>
<BR>
Regards,<BR>
Al<BR>
</FONT>Aeonsolar<BR>
917 699 6641<BR>
<BR>
<BR>
<BR>
<HR ALIGN=CENTER SIZE="3" WIDTH="95%"></SPAN></FONT><FONT SIZE="2"><FONT FACE="Consolas, Courier New, Courier"><SPAN STYLE='font-size:10pt'>_______________________________________________<BR>
List sponsored by Home Power magazine<BR>
<BR>
List Address: <a href="RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a><BR>
<BR>
Options & settings:<BR>
<a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><BR>
<BR>
List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a><BR>
<BR>
List rules & etiquette:<BR>
www.re-wrenches.org/etiquette.htm<BR>
<BR>
Check out participant bios:<BR>
www.members.re-wrenches.org<BR>
<BR>
</SPAN></FONT></FONT></BLOCKQUOTE><FONT SIZE="2"><FONT FACE="Consolas, Courier New, Courier"><SPAN STYLE='font-size:10pt'><BR>
</SPAN></FONT></FONT><FONT FACE="Calibri, Verdana, Helvetica, Arial"><SPAN STYLE='font-size:11pt'><BR>
<BR>
<BR>
</SPAN></FONT>
</BODY>
</HTML>