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
