Seems to me this has come up before. With bad breakers as probable cause. I don’t know if the heat has caused buss damage Might go for CH or QO breakers instead BR style.
Jay > On Aug 4, 2022, at 8:08 PM, Jerry Shafer via RE-wrenches > <[email protected]> wrote: > > > Jason > Is the installation designed for 208 as you have greater limitations then > 240, so now replace the buss and all the breakers, after that run currents > tests and see what you have. I had a 3 phase that the tin cam off the buss > and looked like a plazma cutter due to the exposed aluminum > Fun times > >> On Thu, Aug 4, 2022, 11:12 AM Jason Szumlanski via RE-wrenches >> <[email protected]> wrote: >> I have a commercial 208 volt job where four of 11 fully populated strings of >> IQ7A had breakers that were tripped as reported by the client. They were >> able to reset two of them. They also reported that the two they were not >> able to reset we're very hot. The other two were warm. By the time I got to >> the site, all four breakers had permanently failed. >> >> Once I got replacements, I was able to install them and they turned on >> without any faults. I gave it about 15 minutes and then put my infrared >> camera on it. To my surprise, the breaker immediately above two of the >> failed breakers and across from the other two failed breakers was clearly >> hot. I'm thinking this might have been the bad breaker all along causing the >> heat issue on the bus bar which made adjacent breakers fail. But this hot >> breaker did not fail. >> >> Does this seem like a plausible scenario, and if so, any ideas on what might >> have caused it? All of the breaker bolts were tight, but a couple were not >> torqued to spec. I just find it strange that one breaker that didn't fail >> would cause other adjacent breakers to heat up enough to fail. >> >> Flir image attached. This was after I replaced the four failed breakers. >> >> Jason Szumlanski >> Florida Solar Design Group >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> 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/[email protected]/ >> 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: [email protected] > > 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/[email protected]/ > 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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