<div dir="ltr"><div>Bill,<br></div>Did I understand your earlier post to infer that there never was an intent to apply the "opposite end of the buss" rule to the 120% backfeed allowance in residential applications? And that you have been working to rewrite a solar backfeed breaker in a residential setting to land anywhere on the buss?<br><br><div><div><div class="gmail_extra">Howie<br clear="all"></div><div class="gmail_extra"><div><div class="gmail_signature"><div dir="ltr"><span style="color:rgb(120,63,4)"><b>Howie Michaelson</b></span><br><font size="1"><i>NABCEP Certified Solar PV Installer™</i></font><br><span style="color:rgb(106,168,79)"></span>Sun Catcher, LLC<br><span style="color:rgb(68,68,68)"><span style="background-color:rgb(255,255,255)"><font size="2">Renewable Energy Systems Sales and Service<br>VT Solar Electric Incentive Partner</font><span></span></span></span><br><span style="color:rgb(180,95,6)">802-272-0004</span></div></div></div>
<br><div class="gmail_quote">On Thu, Mar 3, 2016 at 12:07 PM, <span dir="ltr"><<a href="mailto:billbrooks7@sbcglobal.net" target="_blank">billbrooks7@sbcglobal.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div link="blue" vlink="purple" lang="EN-US"><div><p class="MsoNormal">Phil,<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">I think you already understand how to apply the “120% rule.” All this is saying is that the breaker can go at either end of a center-fed panel for dwellings. Do you understand now?<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">To summarize—a 200A center-fed panel would allow a 40-amp PV breaker to be installed at either end to meet the 120% rule.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Bill.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b>From:</b> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Philip Lawes Insoltech<br><b>Sent:</b> Thursday, March 03, 2016 8:26 AM<br><b>To:</b> 'RE-wrenches' <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br><b>Subject:</b> Re: [RE-wrenches] NEC 705.12 Point of Connection - 120% rule for center-fed panelboards<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><span style="color:#1f497d">Bill,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Could you please provide an example of this showing calculations?<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Thanks so much,<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d">Phil<u></u><u></u></span></p><p class="MsoNormal"><span style="color:#1f497d"><u></u> <u></u></span></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b>From:</b> RE-wrenches [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b><a href="mailto:billbrooks7@sbcglobal.net" target="_blank">billbrooks7@sbcglobal.net</a><br><b>Sent:</b> Wednesday, March 2, 2016 11:24 AM<br><b>To:</b> 'RE-wrenches' <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br><b>Subject:</b> Re: [RE-wrenches] NEC 705.12 Point of Connection - 120% rule for center-fed panelboards<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">All,<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Here is the new language that has been approved for the 2017 NEC (more authoritative than JW).<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">705.12(B)(3)(d)<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Times New Roman",serif">(d) A connection at either end, but not both ends, of a center-fed panelboard in dwellings shall be permitted where the sum of 125 percent of the power source(s) output circuit current and the rating of the overcurrent device protecting the busbar does not exceed 120 percent of the current rating of the busbar.<u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">This clarifies that it was never the intent of the NEC to limit the 120% rule to the opposite end of the busbar for dwellings (it was allowed from 2005 back to 1987). I was able to convince the panel that centerfed panels did not need the opposite end stipulation. Several large jurisdictions in California or considering making an official policy accepting the language of the 2017 NEC on this item. Please share this with your own jurisdiction.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">Bill.<u></u><u></u></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p><div><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b>From:</b> RE-wrenches [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Glenn Burt<br><b>Sent:</b> Wednesday, March 02, 2016 10:54 AM<br><b>To:</b> RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><br><b>Subject:</b> Re: [RE-wrenches] NEC 705.12 Point of Connection - 120% rule for center-fed panelboards<u></u><u></u></p></div></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal">I believe that John Wiles has stated this in a couple of places in print, therefore you may have a tough time justifying a way around the rule to an AHJ.<br><br>Supply side connections are very popular in this situation.<u></u><u></u></p></div></div><div><div class="MsoNormal" style="text-align:center" align="center"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><hr align="center" size="2" width="100%"></span></div><p class="MsoNormal" style="margin-bottom:12.0pt"><b>From: </b><a href="mailto:august@luminalt.com" target="_blank">August Goers</a><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br></span><b>Sent: </b>3/2/2016 11:32<span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br></span><b>To: </b><a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches</a><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br></span><b>Subject: </b>[RE-wrenches] NEC 705.12 Point of Connection - 120% rule for center-fed panelboards<span style="font-size:12.0pt;font-family:"Times New Roman",serif"><u></u><u></u></span></p></div><p class="MsoNormal">All –<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">We are seeing more AHJs not allowing us to use the NEC 7015.12(D)(2)(3)(b) 120% rule on center-fed panelboards. For example, if we have a 100 A meter/main combo with a center fed 100 A breaker we cannot apply the 120% rule at all and need to do a panel swap. What are other wrenches doing in this case?<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">Best,<u></u><u></u></p><p class="MsoNormal"> <u></u><u></u></p><p class="MsoNormal">August<u></u><u></u></p><p class="MsoNormal">Luminalt<u></u><u></u></p></div></div><br>_______________________________________________<br>
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