Re: [RE-wrenches] Bonding Metal Roofs Part II

[Jay via RE-wrenches]

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/ e-mail offgridso...@sti.net text 209 813 0060 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 (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

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