Yes, Jay, this is a TenKSolar system -- they certainly do have a habit of taking the 'thinking outside the box' approach!
The microinverter manufacturer states in their installation manual, "Connect the grounding electrode conductor to the microinverter ground clamp" so it's quite clear we are dealing with GEC rules. Thanks for all your comments and the reminder of the NEC 250.166(C) exception which I hadn't really connected with before. I'm having difficulty understanding what the requirement in that paragraph actually means. When it states "that portion of the grounding electrode conductor that is the sole connection to the grounding electrode shall not be required to be larger than 6AWG..." -- what does "that portion" and "sole connection" mean? If we have a number of GEC branches from that are irreversably spliced to a single 6AWG conductor bonded to the grounding electrode, do those various GECs affect the "that portion" and "sole connection" at all? Charlie Pickard NABCEP Certified PV Installation Professional T Aladdin Solar, LLC ----- Original Message ----- From: Bill Brooks To: 'RE-wrenches' Sent: Wednesday, September 18, 2013 2:42 PM Subject: Re: [RE-wrenches] GEC sizing for a high amp,low voltage PV system with microinverters Nick, Thanks for the clarification-it is a mysterious threaded hole.. Bill. From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Nick Soleil Sent: Wednesday, September 18, 2013 10:19 AM To: RE-wrenches Subject: Re: [RE-wrenches] GEC sizing for a high amp, low voltage PV system with microinverters Hi Bill and wrenches, To clarify, our new Enphase M250 microinverter does not have a grounding terminal. The grounding of the M250 will be provided through the Engage cable. We only have a hole in the lid, in the rare case that a lug will be desired or required by the AHJ, but we do not provide the grounding clip with the microinverter. A grounding terminal can be added to the microinverter. We have an application note on alternate grounding methods for the M250, if needed. __________ Information from ESET NOD32 Antivirus, version of virus signature database 8815 (20130918) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ------------------------------------------------------------------------------ _______________________________________________ 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 __________ Information from ESET NOD32 Antivirus, version of virus signature database 8815 (20130918) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 8817 (20130918) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com
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