I've seen a video a solar installer friend of mine made of a similar unsuited disconnect trying to break a high VDC string of modules. The disconnect opened and the arc was able to jump the gap and start the insulation of the conductor on fire.
Has anyone seen/heard of the square D not extinguishing an arc when using only one pole? Jesse Sent from my iPad!!! On Aug 25, 2012, at 10:45 PM, R Ray Walters <[email protected]> wrote: > The problem with this stuff is not passing inspection, it's actually turning > the system off under load! I think if you watched the arcing on the > contacts, you would agree that the system you saw has only a very limited > number of switch cycles before it fails...... possibly in the ON position. > 600 VDC rated fuse holders for instance will completely arc across the open > contacts at 900 vdc. > This is one area where you don't have much safety factor, IMHO. > > Ray Walters > > On Aug 25, 2012, at 9:17 PM, Jesse Dahl wrote: > >> I've been using similar "solar" disconnects. Its nice to see UL. I looked >> at a local solar project today that the installer used GE 600VAC/250VDC >> disconnects on the DC side. Three strings with each being broken by one >> pole. It had passed inspection. >> >> Jesse >> >> On Sat, Aug 25, 2012 at 7:38 PM, Glenn Burt <[email protected]> wrote: >> We switched (ha!) to Siemens disconnects after the hoopla about Square >> Dhttp://www.sea.siemens.com/us/internet-dms/btlv/CircuitProtection/HeavyDutySafetySwitches/docs_HeavyDutySafetySwitches/HD%20Photovoltaic%20Final%20050110.pdf >> >> >> >> I really don’t think there is a problem using the SQD if you can series up a >> couple of poles. >> >> >> >> -Glenn >> >> >> >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Jesse Dahl >> Sent: Friday, August 24, 2012 9:43 PM >> To: RE-wrenches >> Subject: [RE-wrenches] Disconnets >> >> >> >> Hello, >> >> >> >> I've been having a long conversation with a local guy about disconnects that >> are usable in DC PV circuits. From what I have seen, GE, Eaton... they are >> usable up to the 250VDC it has listed on the labels, or more if poles are >> wired in series. The squared D 600Vac/dc is self tested to 600VDC/pole. The >> disconnects in question are not the "solar disconnects" on the market now. >> >> >> >> What are people using for the GDI systems? I seem to think that if if says >> 250VDC on the label, that is its rating unless you wire pole in series and >> the manufacturer has literature saying that that is acceptable. >> >> >> >> Thoughts on the square D self listing? >> >> >> >> >> >> Jesse >> >> >> _______________________________________________ >> List sponsored by Home Power magazine >> >> List Address: [email protected] >> >> 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: [email protected] >> >> 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: [email protected] > > 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 >
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