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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Hi Jason,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">That helps clarify the situation a little bit. I'm not familiar with the Lennox product. That said, Enphase M190 cabling has a line 1, line 2, and neutral (I believe blue colored) then you add a ground. The neutral and ground should not connect. That is consistent with what you said below in your recommendation. </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best,</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">August</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","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""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Jason Szumlanski<br>
<b>Sent:</b> Friday, July 05, 2013 4:25 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] EGC for Enphases</span></p><p class="MsoNormal"> </p><p>I think what Dave is saying is that the enphase cable neutral is connected to the EGC in the roof mounted j-box, and no neutral is run to the Lennox panel or disconnect. While the neutral should not carry line current under normal operation, Enphase calls it a neutral - look up the NEC definition of neutral. I can see an AHJ having reservations about this, whether the "combined Neutral/EGC/GEC" is bare or insulated. </p>
<p>I would not waste time trying to argue this with the AHJ. I would bring three current carrying conductors plus a combined EGC/GEC to the main distribution panel, just like every other Enphase job we do. </p><p>I spend a fair amount of time explaining how this solar powered air conditioner is nothing revolutionary, except for the creative marketing. Anyone out there try to team up with a HVAC company to market any A/C unit as solar powered?</p>
<p>Jason Szumlanski<br>Fafco Solar</p><div><p class="MsoNormal">On Jul 5, 2013 5:14 PM, "August Goers" <<a href="mailto:august@luminalt.com">august@luminalt.com</a>> wrote:</p><p class="MsoNormal" style="margin-bottom:12.0pt">
Hi Dave,<br><br>I'm not sure I'm understanding your scenario clearly but I'll take a crack<br>at it. The Enphase system should have a bare #6 GEC for each micro and can<br>then transition to a #8 green GEC once in conduit and run all the way back<br>
to the main ground electrode system. The #6 and #8 should be irreversibly<br>crimped together since the GEC needs to be continuous. Certainly it is not<br>okay for the neutral in the Lennox panel to be bare unless it is somehow a<br>
main panel. You could run the DC GEC along with the other conductors and<br>it can serve as a dual purpose GEC and equipment grounding conductor per<br>2011 NEC 690.47(C)(3).<br><br>Best,<br><br>August<br>-----Original Message-----<br>
From: <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a><br>[mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] On Behalf Of Dave Click<br>
Sent: Wednesday, July 03, 2013 6:26 AM<br>To: RE-wrenches<br>Subject: [RE-wrenches] EGC for Enphases<br><br>All,<br><br>I was just looking at small 4-module Andalay (Enphase 190) system tying<br>into one of the Lennox solar-ready air conditioners. The engineer had<br>
specified the 690.47(C) GEC be run directly from the array down to the<br>existing electrode. Running from the inverters is a 2+G wire to the Lennox<br>panel; they are using the uninsulated ground as the circuit neutral. It<br>
seems to me that this violates 200.7 (grounded conductor marked white or<br>grey). Also, 250.134(B) (EGC run with circuit conductors), about which the<br>engineer states "I have been studying the NEC on this and I believe that<br>
the intent is to permit the ground to be carried with the current carrying<br>conductors, not require."<br><br>Am I missing something?<br><br>Thanks,<br>Dave<br>_______________________________________________<br>List sponsored by Home Power magazine<br>
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