I think I'm a bit confused on this point. I can't seem to find the code that specifically exempts the GEC requirement for inverters of ungrounded PV systems. The only exception I can find is only for AC PV modules (2014 NEC 690.47 (C) ).
I just looked in the installation manual for Solectria's new TL inverters and found this: "Per NEC 690.47, a GEC must be installed, and the Grounding Electrode Terminal (GET) conductor must be sized in accordance with NEC article 250.166." What am I missing? Thanks, Dana Dana Brandt Ecotech Energy Systems, LLC www.ecotechenergy.com d...@ecotechenergy.com 360.318.7646 On Tue, Oct 28, 2014 at 11:30 AM, Rebekah Hren <rebekah.h...@o2energies.com> wrote: > If you are on 2014: > 690.47(B) > > An ac equipment grounding system shall be permitted > > to be used for equipment grounding of inverters and other > > equipment *and for the ground-fault detection reference for * > *ungrounded PV systems.* > > and 690.47(C)(3) > > *For ungrounded systems, this con**ductor shall be sized in accordance > with 250.122 *and shall > > not be required to be larger than the largest ungrounded > > phase conductor. > > On Tue, Oct 28, 2014 at 2:22 PM, Gary Willett < > g...@icarussolarservices.com> wrote: > >> Kirk: >> >> A DC grounding electrode conductor (GEC) is not required for inverters >> that do NOT have a ground reference for the PV+ and PV- conductor(s) from >> the PV array. >> >> A GEC is not required if the string inverter is one of the new TL >> (transformerless) types. Also, this applies to micro-inverters such as the >> new Enphase M250 and later versions of the M215. >> >> Where this applies, only a properly sized equipment grounding conductor >> (EGC) is required. >> >> The EGC is sized according to [NEC 690.45] and can be a minimum of #14AWG >> when not exposed to damage, or #6AWG when exposed to potential damage. >> >> Regards, >> >> Gary Willett PE >> Icarus Engineering LLC >> >> >> On 10/28/14, 12:53 PM, Kirk wrote: >> >>> Hi, >>> I'm on a jobsite without my code book. Could someone tell me where in >>> the code ungrounded systems do not require the inverter GEC? Basically my >>> onsite electrician doesn't believe me. Thanks. >>> >>> Kirk Herander >>> VSE >>> _______________________________________________ >>> List sponsored by Redwood Alliance >>> >>> List Address: RE-wrenches@lists.re-wrenches.org >>> >>> Change listserver email address & settings: >>> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >>> >>> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. >>> org/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> List-Archive: http://www.mail-archive.com/re-wrenches@lists.re-wrenches. >> org/maillist.html >> >> List rules & etiquette: >> www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> www.members.re-wrenches.org >> >> > > > -- > Tel: 336.266.8800 > http://o2energies.com/ > Project Engineer > NABCEP Certified PV Installation Professional™ 091209-85 > NC Licensed Electrical Contractor > > This message, together with any attachments, is intended only for the > named recipient(s). It may contain confidential or privileged information > that may be exempt from disclosure under applicable law. If you are not > the intended recipient(s), you are notified that the disclosure, > dissemination, distribution, copying, storing, or other use of the contents > of this message or its attachments is strictly prohibited. If you receive > this message in error, or are not the named recipient(s), please notify the > sender at either the email address or telephone number above and delete > this email from your computer. Thank you. > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: RE-wrenches@lists.re-wrenches.org > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > >
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