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.
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. 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? Jason Szumlanski Fafco Solar On Jul 5, 2013 5:14 PM, "August Goers" <aug...@luminalt.com> wrote: > Hi Dave, > > I'm not sure I'm understanding your scenario clearly but I'll take a crack > at it. The Enphase system should have a bare #6 GEC for each micro and can > then transition to a #8 green GEC once in conduit and run all the way back > to the main ground electrode system. The #6 and #8 should be irreversibly > crimped together since the GEC needs to be continuous. Certainly it is not > okay for the neutral in the Lennox panel to be bare unless it is somehow a > main panel. You could run the DC GEC along with the other conductors and > it can serve as a dual purpose GEC and equipment grounding conductor per > 2011 NEC 690.47(C)(3). > > Best, > > August > -----Original Message----- > From: re-wrenches-boun...@lists.re-wrenches.org > [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Dave Click > Sent: Wednesday, July 03, 2013 6:26 AM > To: RE-wrenches > Subject: [RE-wrenches] EGC for Enphases > > All, > > I was just looking at small 4-module Andalay (Enphase 190) system tying > into one of the Lennox solar-ready air conditioners. The engineer had > specified the 690.47(C) GEC be run directly from the array down to the > existing electrode. Running from the inverters is a 2+G wire to the Lennox > panel; they are using the uninsulated ground as the circuit neutral. It > seems to me that this violates 200.7 (grounded conductor marked white or > grey). Also, 250.134(B) (EGC run with circuit conductors), about which the > engineer states "I have been studying the NEC on this and I believe that > the intent is to permit the ground to be carried with the current carrying > conductors, not require." > > Am I missing something? > > Thanks, > Dave > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Change email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > >
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