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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">August:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">The 2014 code, which the AHJ for this project is using, states the following:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">(<i>1) Dedicated Overcurrent and Disconnect. The source</i></span></p><p class="MsoNormal"><i><span style="font-family:"Verdana","sans-serif";color:#1f497d">interconnection of one or more inverters installed in one</span></i></p><p class="MsoNormal"><i><span style="font-family:"Verdana","sans-serif";color:#1f497d">system shall be made at a dedicated circuit breaker or fusible</span></i></p><p class="MsoNormal"><i><span style="font-family:"Verdana","sans-serif";color:#1f497d">disconnecting means.</span></i></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Note that the language says, \u201cThe source interconnection\u2026\u201d (singular), and \u201cat a dedicated circuit breaker\u2026\u201d(again singular). This makes it obvious to me that the language says that the outputs of multiple inverters need to be aggregated and connected via <u>one</u> OCPD. I think the other wrenches missed this point.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Your input is valuable by contrasting the language of the 2014 code with that of the 2017 version. The inclusion of the phrase \u201cEach source\u2026\u201d in the 2017 code completely changes the meaning. Some AHJs will look to future code versions for clarity even if they are not yet adopted. I think this is a good thing, and I really appreciate you bringing up the new language.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">The article from AEIA magazine ratifies the conclusion I drew from the 2014 code. Fortunately the AHJ is misinterpreting the section to allow the more liberal interpretation, the one that the 2017 code reflects. I find it best to contact the plan checker directly, which I did, and we are approved for multiple OCPDs. By the way, I think that article is well written and I have book marked it.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I don\u2019t know if the 2014 language was a mistake corrected in 2107, or what the thinking was of the authors. Regardless, we live by the language, not the intent.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thank you as well to all who responded.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> August Goers [mailto:<a href="mailto:august@luminalt.com">august@luminalt.com</a>] <br><b>Sent:</b> Monday, February 25, 2019 9:07 AM<br><b>To:</b> William Miller; RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] Multiple inverters</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">Hi William - </p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">In this case, it is helpful to look forward to the 2017 NEC for guidance:</p></div><div><p class="MsoNormal"> </p></div><div><div><p class="MsoNormal"><img width="440" height="402" id="_x0000_i1025" src="cid:image001.png@01D4CD53.0ED97920" alt="image.png"></p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">I believe it's perfectly fine to have multiple inverter breakers in your main.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">August</p></div><div><p class="MsoNormal">Luminalt</p></div><p class="MsoNormal"> </p></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Mon, Feb 25, 2019 at 8:42 AM William Miller <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><div><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif"">Friends:</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><i><span style="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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="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" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif"">Thanks in advance.</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif"">William</span></p><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Verdana","sans-serif""> </span></p></div></div><p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a></p></blockquote></div></div></body></html>