<html><head></head><body bgcolor="#FFFFFF"><div>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. </div><div><br></div><div>Has anyone seen/heard of the square D not extinguishing an arc when using only one pole?</div><div><br></div><div>Jesse <br><br>Sent from my iPad!!!</div><div><br>On Aug 25, 2012, at 10:45 PM, R Ray Walters <<a href="mailto:ray@solarray.com">ray@solarray.com</a>> wrote:<br><br></div><div></div><blockquote type="cite"><div>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.<div>This is one area where you don't have much safety factor, IMHO. <br><div><br></div><div>Ray Walters</div><div><br><div><div>On Aug 25, 2012, at 9:17 PM, Jesse Dahl wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">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.<div>
<br></div><div>Jesse<br><br><div class="gmail_quote">On Sat, Aug 25, 2012 at 7:38 PM, Glenn Burt <span dir="ltr"><<a href="mailto:glenn.burt@glbcc.com" target="_blank">glenn.burt@glbcc.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0.8ex; border-left-width: 1px; border-left-color: rgb(204, 204, 204); border-left-style: solid; padding-left: 1ex; position: static; z-index: auto; ">
<div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">We switched (ha!) to Siemens disconnects after the hoopla about Square D</span><span class="Apple-style-span" style="color: rgb(31, 73, 125); font-family: Calibri, sans-serif; font-size: 15px; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.296875); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469); "><a href="http://www.sea.siemens.com/us/internet-dms/btlv/CircuitProtection/HeavyDutySafetySwitches/docs_HeavyDutySafetySwitches/HD%20Photovoltaic%20Final%20050110.pdf" target="_blank">http://www.sea.siemens.com/us/internet-dms/btlv/CircuitProtection/HeavyDutySafetySwitches/docs_HeavyDutySafetySwitches/HD%20Photovoltaic%20Final%20050110.pdf</a></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">I really don\u2019t think there is a problem using the SQD if you can series up a couple of poles. <u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-Glenn<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"><u></u> <u></u></span></p><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" target="_blank">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Jesse Dahl<br>
<b>Sent:</b> Friday, August 24, 2012 9:43 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> [RE-wrenches] Disconnets<u></u><u></u></span></p></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal">
Hello,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">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. <u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">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. <u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Thoughts on the square D self listing?<u></u><u></u></p></div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">
<u></u> <u></u></p></div><div><p class="MsoNormal">Jesse<u></u><u></u></p></div></div></div></div></div><br>_______________________________________________<br>
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