<div dir="ltr">Here in upstate NY, we have certainly had multiple inverter breakers land in the main panel. In a situation like yours, we have also left the old system as a load side connection, and then turned the new system in to a supply side connection so that the bus bar in the main panel is not overloaded. No inspectors here seem to care as long as the labeling shows what is happening. Although we are also fortunate that most inspectors around here will not make us fix old work as long as we did not touch it and it presents no safety hazard.<div><br></div><div>Cheers,</div><div>Dave<br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div><br></div><div><b><font face="tahoma, sans-serif">Dave Tedeyan, PE</font></b></div><div><font face="tahoma, sans-serif">Senior Engineer | Taitem Engineering, PC</font></div><div><font face="tahoma, sans-serif"><img src="https://www.taitem.com/signatures/logo.png"><br></font></div><div><font face="tahoma, sans-serif">10 Verizon Lane | Lansing, NY 14882</font></div><div><font face="tahoma, sans-serif">o. <u>607.930.3481</u> x6 f. 607.277.2119</font></div><div><font face="tahoma, sans-serif"><a href="http://www.taitem.com" target="_blank">www.taitem.com</a></font></div><div><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Solar </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022</span><span style="font-family:tahoma,sans-serif;font-size:12.5pt;line-height:17.8333px"> </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Sustainability </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Energy </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">\u2022 </span><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px">Design</span><br></div><div><span style="font-family:tahoma,sans-serif;font-size:10pt;line-height:14.2667px"><span style="font-size:13.3333px">B-Corporation Best for the World 2018 Honoree</span></span></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Feb 25, 2019 at 11:42 AM William Miller <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US"><div class="gmail-m_5943249013204616823WordSection1"><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">Friends:</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">I have an NEC code question on an upcoming project. It is a home that has an existing 8 kW ground-mounted grid-tied system. The owner wants to add another 10 kW of grid-tied PV. My question is about 705.12, point of connection. Specifically section (D)(1). That section states: </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><i><span style="font-size:12pt;font-family:Verdana,sans-serif">The source interconnection of one or more inverters installed in one system shall be made at a dedicated circuit breaker or fusible disconnecting means.</span></i></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">So if there are going to be two inverters on premise, do the outputs have to be aggregated to connect via one circuit breaker? This might be difficult to do as the exiting inverter is connected via a different sub-panel than the one that is planned to receive the new inverter output.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">This <a href="https://iaeimagazine.org/magazine/2014/01/16/load-side-pv-connections/" target="_blank">article</a> addresses the question.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">I would be very grateful if any of you can share any experience you might have in interpreting this section of the code.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">Thanks in advance.</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif">William</span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:Verdana,sans-serif"> </span></p></div></div>
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