Also being in NYS, I have been familiar with this requirement for a long time. I believe the idea is that just like how any metal part in a system needs to be grounded, metal roof panels under solar panels are kind of part of the system. What if a wire comes loose and touches the roof? You would not want someone going up there to get zapped. I see the point that the worst you can do with RSD is 80V. But in NY at least, you cant really argue with NYSERDA if they decide they want this. I have never come across a building or electrical inspector here that would care about this, but NYSERDA does and that is where the incentive money comes from...
On Tue, Jun 6, 2023 at 2:34 PM Jay via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > But isn’t the whole concept of RS to prevent the energizing of say a metal > roof? > > The inverter sees a ground fault or ark fault. Trips off line, the RS > activate and now it’s less than 80v. Isn’t that what it’s supposed to do? > > What is the purpose of grounding the metal roof? > > Jay > > On Jun 6, 2023, at 10:09 AM, Glenn Burt via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > > > If I am not mistaken, this derives from some UL testing that showed that a > metal roof may become energized during a thermal event. > > I suppose no less important than our RSD requirements... > > -Glenn > Sent from my 'smart'phone, so please excuse typos and spelling errors. > > ------ Original message------ > *From: *Jason Szumlanski via RE-wrenches > *Date: *Tue, Jun 6, 2023 10:25 AM > *To: *offgridso...@sti.net;RE-wrenches; > *Cc: *Jason Szumlanski; > *Subject:*Re: [RE-wrenches] Bonding Metal Roofs Part II > > I'm watching this thread with interest. Is anyone aware of any serious > injury or property damage caused by an energized metal roof, and if so, > what were the circumstances? Is bonding metal roofs a solution looking for > a problem? > > In response to the ground mount alternative, that isn't really an option > in many areas of Florida where the cost can be 50% higher or more to ground > mount if it's even practical due to flood level. Tile and shingle roofs in > Southwest Florida are being switched to metal at shocking rates in the wake > of Hurricane Ian, and we love it from an installer's standpoint. > Fortunately, I haven't run into any bonding inspection issues for over 10 > years here. > > Jason Szumlanski > Principal Solar Designer | Florida Solar Design Group > NABCEP Certified Solar Professional (PVIP) > Florida State Certified Solar Contractor CVC56956 > > > On Mon, Jun 5, 2023 at 8:28 PM Dave Angelini Offgrid Solar via RE-wrenches > <re-wrenches@lists.re-wrenches.org> wrote: > >> Hey Adam, >> >> Creative solution #1 Do not install solar on any roof if you can ground >> mount it. >> >> Is this He Adam or the Him Adam? >> >> >> >> *Dave Angelini Offgrid Solar >> "we go where powerlines don't" >> http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> >> e-mail offgridso...@sti.net <offgridso...@sti.net> >> text 209 813 0060 <209%20813%200060>* >> >> >> On 2023-06-05 3:47 pm, AE Solar via RE-wrenches wrote: >> >> Hey all, >> I had started a thread about bonding to metal roofs in 2018 but can't >> figure out how to respond via the archive. I know some things have changed >> since then, so I'm circling back and starting a new thread. >> >> In NY one of our inspection agencies (NYSERDA) requires bonding of metal >> roof panels below the array, as well as within a 3' perimeter of the array. >> S-5! in combination with Ironridge is now listed to bond the roof under the >> array (so long as you hit every pan with an attachment) but this doesn't >> solve the problem of trying to bond within the 3' perimeter. For installs >> where we are only 18" from the ridge, this means we are required to bond >> the adjacent roof as well. >> >> Whenever possible we install Illsco SGB-4 lugs under the ridge cap. But >> more and more we're finding roofs where the ridge cap feels inaccessible, >> tricky, or where we simply don't want to get into roof warranty issues >> associated with opening up a prior contractor's work. >> >> Wondering if anyone else is coming up against this and what some possible >> creative solutions might be. I don't want to walk away from potential >> projects but... >> >> As always, thanks for any thoughts >> Adam >> >> >> Adam Katzman (he/him) >> Autonomous Energies | Owner/Operator >> www.AutonomousEnergies.com <http://www.autonomousenergies.com> >> (518) 567-1468 >> >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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 > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > > -- [image: Logo] <https://www.sungineersolar.com/> Dave Tedeyan, P.E. Owner | Sungineer Solar p: he | him | his a: 1653 Slaterville Rd. | Ithaca, NY 14850 w: www.sungineersolar.com <http://www.sungineersolar.com/> c: (607) 279-4258
_______________________________________________ List sponsored by Redwood Alliance Pay optional member dues here: http://re-wrenches.org 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 There are two list archives for searching. When one doesn't work, try the other: https://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/ http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: http://www.re-wrenches.org/etiquette.htm Check out or update participant bios: http://www.members.re-wrenches.org