If I understood Peter’s original email properly, he noted that the ground bushings had been “broken” to facilitate installation. If indeed regular ground bushings had been modified or cut then that would violate the correct installation methods. Here is a regular ground bushing:
If they actually installed the split-type retrofit style bushings, such as the one below, then there shouldn’t be a problem: I would cite NEC 250.97 Bonding for Over 250 Volts (4) Listed fittings. A listed fitting must be used to bond the metal raceway. A modified or broken ground bushing is not a listed fitting. August August Goers Principal Luminalt m: 415.559.1525 o: 415.640.4000 aug...@luminalt.com *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org] *On Behalf Of *Kirk Herander *Sent:* Tuesday, March 07, 2017 10:58 AM *To:* 'RE-wrenches' *Subject:* Re: [RE-wrenches] Conduit Bushings Peter, Bridgeport makes both split ring grounding bushings and plastic bushings in that size. No threading on to the connector required. *From:* RE-wrenches [mailto:re-wrenches-boun...@lists.re-wrenches.org <re-wrenches-boun...@lists.re-wrenches.org>] *On Behalf Of *William Miller *Sent:* Saturday, March 04, 2017 3:08 AM *To:* RE-wrenches *Subject:* Re: [RE-wrenches] Conduit Bushings Peter: Would these work? http://www.garvinindustries.com/conduit-fittings-supports/rigid-conduit-fittings/split-grounding-bushings/sgb50?gclid=CI7R876yvNICFQmIfgodVAkI3g William On Mar 3, 2017, at 11:14 AM, <peter.parr...@calsolareng.com> < peter.parr...@calsolareng.com> wrote: Recently we were asked to do a combined inspection and engineering review of a 362.70 kWdc PV system using 5 Sungrow SG60KM-U inverters. We found issues like palm trees and air handling equipment shading significant parts of the arrays, electrician’s tape and palm fronds on the surface of the modules. But we also observed two significant Code violations: PV source conductors lying on the surface of the torch-down roof and lack of bushings at the connectors on the ends of 2” LFMC. The PV source conductors got secured and we saw bushings threaded onto the ends LFMC connectors. Upon close inspection we discovered that the bushings had been broken at one point on their circumference, no doubt to simplify their attachment. Their were 11 PV source circuits (22 current-carrying 10 AWG PV Wire conductors.) Is this a NEC Code violation? If so, what section would we cite? It seems obvious that the bushing had been “modified”, but I would like to be more specific. Or does it come under the workmanship category? Regards, - Peter Parrish Peter T. Parrish, Ph.D., President SolarGnosis 1107 Fair Oaks Ave. Suite 351 South Pasadena, CA 91030 (323) 839-6108 peter.parr...@solargnosis.com _______________________________________________ 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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