I've oft wondered why we didn't use this time tested automotive wiring method more in PV; especially at higher voltages. An energized roof is a happy roof as they say. You go Solar Guru.
R. Walters r...@solarray.com Solar Engineer On Apr 1, 2010, at 10:53 AM, Jason Szumlanski wrote: > I am installing a PV array at about 400Vdc on a metal roof. The inverter > is located a very long way from the array. I am contemplating just > running a positive conductor for most of the run. I was thinking about > connecting the negative PV conductor to a lug solidly bonded to the > metal roof material. Then at the bottom of the roof, near the eave, I > would attach another lug and continue with a negative PV conductor. At > junctions of the roof material, I would drive a self-tapping stainless > steel screw for continuity (with sealant, of course). This would save > lots of copper. And since the negative conductor is bonded to the module > frame by way of the metal roof, the negative PV conductor would also > serve as the ground wire. > > What do you think? Would this pass inspection? What NEC sections would > apply? > > Thank you for your time, > > Solar Guru > > P.S. April Fools > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & 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 Options & 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
