Yes, this is a loose connection coupled with no way to detect and respond to the Arc fault. It doesn't have to be loose on that conductor on a common bus, any bad connection can build up heat and melt conductors. Scary!
On Mon, Jan 31, 2022, 6:51 PM Dave Tedeyan <d...@sungineersolar.com> wrote: > Hi All, > > I was troubleshooting a Schneider system today (not my install, so I don't > know the history) and came across a wire where the insulation actually > burnt off. See the attached photo. I have never seen anything like it. Does > anyone know how this could happen? It was a Conext MPPT 80 600 charge > controller going to a 100A breaker, with what appears to be #2 CU wire. > This is in a heated shed, and there is no evidence of water leakage. The > charge controller was still working just fine. And it was only that last 6" > or so of the wire, the rest of it appeared to be fine. > > Cheers, > Dave > > -- > [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) 288-2898 > _______________________________________________ > 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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