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<DIV style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">Lots of supply side connections (not line side taps) here in NY.<BR><BR>Glenn </DIV></DIV>
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<SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">From: </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif"><A href="mailto:taharvey@heliocentric.org">Troy Harvey</A></SPAN><BR><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">Sent: </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">4/2/2014 13:40</SPAN><BR><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">To: </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif"><A href="mailto:re-wrenches@lists.re-wrenches.org">RE-wrenches</A></SPAN><BR><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif; FONT-WEIGHT: bold">Subject: </SPAN><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri,sans-serif">Re: [RE-wrenches] Busbar 120% rule</SPAN><BR><BR></DIV>Thanks Bill, Makes sense to me too. Splitting your current over two sections of busbar, as calculated by P=I^2R, does seem like it will in reality reduce the heat load in the load center.
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<DIV>However, no good AHJ solutions today. We are finding the most customers have been moving towards larger systems as panel prices have fallen. If typical service is 200AMP, and that average american household usage is ~32kWh/day, that is approx. a 8kW system in most areas. And 8kW inverter * 125% means a 43AMP backfeed. Next size up is 50amp. That is bigger than 120%. This is most every project we work on these days is over 120%. </DIV>
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<DIV>So how is everyone else dealing with this?
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<DIV style="WORD-WRAP: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space"><SPAN style="FONT-SIZE: 11px">thanks,<BR><BR>Troy Harvey<BR><BR></SPAN><BR><BR></DIV></SPAN></DIV><BR>
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<DIV>On Mar 28, 2014, at 8:38 PM, Bill Brooks <<A href="mailto:billbrooks7@yahoo.com">billbrooks7@yahoo.com</A>> wrote:</DIV><BR class=Apple-interchange-newline>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri, sans-serif; COLOR: rgb(31,73,125)">Dave and Troy,<o:p></o:p></SPAN></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri, sans-serif; COLOR: rgb(31,73,125)">I don’t think JW had his facts correct on this. The standard test for a busbar is to place the highest allowable breakers directly below the main breaker to test for overtemperature of the busbar. With the requirement for Article 220 compliance of the panel, a panel that actually complies with Article 220 could go to 200% and will likely run cooler than a panel only fed by the utility.<o:p></o:p></SPAN></DIV>
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<DIV style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman', serif; MARGIN: 0in 0in 0pt"><SPAN style="FONT-SIZE: 11pt; FONT-FAMILY: Calibri, sans-serif; COLOR: rgb(31,73,125)">Devil’s advocates state that people violate Article 220 all the time so we need to be conservative.<o:p></o:p></SPAN></DIV>
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