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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Blake:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Thanks for sharing the data sheet. The document applies to DC PV systems, however, and I believe the discussion pertains to the AC inverter output. Therefore the bulletin you attached does not apply here. </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">(Note also that this data sheet indicates you need to use two poles for any application, ungrounded or grounded. I believe that requirement was usurped later on for Square D Heavy Duty switches, but again, that is for a different application.)</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I looked again at Square D general and heavy duty safety switches rated at 30 Amps and I could not find any reference that these switches are continuous duty rated. I still believe that for the application described, the 125% rating has to be applied.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">If, hypothetically, you could find a 30A disconnect that was continuous duty rated, if it is fed by a 40 Amp breaker, as I believe would be required, then the 30 Amp disconnect is still not suitable. You can not feed a 30 Amp rated device with more than 30 Amps.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Bottom line, a 30 Amp disconnect will not meet code on the described project.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William Miller</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">805-438-5600</span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d"><a href="http://www.millersolar.com/"><span style="color:blue">www.millersolar.com</span></a></span></p><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:#1f497d">CA Lic. 773985</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d">Quote of the month: \u201cAs they age, batteries transition from energy </span></p><p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial","sans-serif";color:#1f497d">storage devices to energy consuming devices.\u201c W. Miller</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><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""> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Blake Gleason<br><b>Sent:</b> Wednesday, August 21, 2019 4:20 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] 30 amp disconnect/40 amp breaker</span></p><p class="MsoNormal"> </p><div><p class="MsoNormal">Typically a fused disconnect can only handle 80% of it's nominal current on a continuous basis. Unfused disconnects are often 100% rated. For example, see attached Square D bulletin #3110DB0401R0410.</p><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">So, a 100% rated (unfused) 30A disconnect (at least, from Square D) should be fine here, as long as your OCPD is provided elsewhere (eg, the breaker you mentioned). </p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">NEC 690.8(B)(1)(Exception) explicitly allows a 100%-rated device to be used without multiplying the inverter output current by 125%.</p></div><div><div><p class="MsoNormal"> </p></div></div></div><p class="MsoNormal"> </p><div><div><p class="MsoNormal">On Wed, Aug 21, 2019 at 3:22 PM Greg <<a href="mailto:greg@remotepowerinc.com">greg@remotepowerinc.com</a>> wrote:</p></div><blockquote style="border:none;border-left:solid #cccccc 1.0pt;padding:0in 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in"><div><p class="MsoNormal">Fellow Wrenches, I'm having a discussion with a utility engineer regarding the following situation:<br><br>Installing a 6kW inverter that has a full rated output of 25 amps. 80% of 30 is 24. That means to me I need to go up to a 40 amp breaker. I'm running #8 (continuous load 25 x 1.25 etc.) <br>The engineer believes I should use a 60 amp disco since it's on a 40 amp breaker. My thinking is I can use a 30 amp disco since it can not produce more than 25 amps ever. <br><br>Do any of you have a reference that shows what I'm doing is okay? Not okay? <br><br>Thanks again, <br>Greg Egan<br>Remote Power Inc. </p></div><p class="MsoNormal" style="margin-bottom:12.0pt">_______________________________________________<br>List sponsored by Redwood Alliance<br><br>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org" target="_blank">RE-wrenches@lists.re-wrenches.org</a><br><br>Change listserver email address & settings:<br><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org" target="_blank">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a><br><br>List-Archive: <a href="http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html" target="_blank">http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html</a><br><br>List rules & etiquette:<br><a href="http://www.re-wrenches.org/etiquette.htm" target="_blank">www.re-wrenches.org/etiquette.htm</a><br><br>Check out or update participant bios:<br><a href="http://www.members.re-wrenches.org" target="_blank">www.members.re-wrenches.org</a></p></blockquote></div><p class="MsoNormal"><br clear="all"></p><div><p class="MsoNormal"> </p></div><p class="MsoNormal">-- </p><div><div><div><div><div><div><div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal"> </p><div><div><div><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0" width="500" style="width:375.0pt;border-collapse:collapse;border-spacing:0px"><tr><td width="100" valign="top" style="width:75.0pt;padding:0in 6.0pt 0in 0in"><p class="MsoNormal"><span style="font-family:"Arial","sans-serif";color:black"><img border="0" width="200" height="110" id="_x0000_i1025" src="https://drive.google.com/a/sunlightandpower.com/uc?id=1LlwqUEX8PYnbyooAHqTQ2mLp-hEsAI2l&export=download"></span><span style="font-family:"Arial","sans-serif";color:#333333"></span></p></td><td valign="top" style="border:none;border-left:solid #ff9a31 2.25pt;padding:0in 0in 0in 6.0pt"><table class="MsoNormalTable" border="0" cellspacing="0" cellpadding="0"><tr><td style="padding:1.5pt 1.5pt 1.5pt 9.0pt"><p class="MsoNormal" style="mso-line-height-alt:12.0pt"><b><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:black">Blake Gleason, PE</span></b><b><span style="font-size:14.0pt;font-family:"Calibri","sans-serif";color:#eaab3b"> </span></b><span style="font-family:"Calibri","sans-serif";color:black">| Employee-Owner |</span><span style="font-family:"Calibri","sans-serif";color:#222222"></span></p></td></tr><tr><td style="padding:1.5pt 1.5pt 1.5pt 9.0pt"><p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:black">Director of Innovation & Technical Excellence</span></b><span style="font-family:"Calibri","sans-serif";color:#222222"></span></p><p class="MsoNormal" style="mso-margin-top-alt:auto"><span style="font-size:10.0pt;color:black"><br>510.845.2997 x128</span><span style="color:black"><br></span><span style="font-size:10.0pt;color:black"><br>Follow us on</span><span style="font-size:10.0pt;color:#eaab3b"> <a href="https://www.facebook.com/pages/Sun-Light-Power/119675658118322?ref=hl" target="_blank"><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#1155cc">Facebook</span></a></span><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#000001">, </span><span style="font-size:10.0pt;color:#eaab3b"><a href="https://www.linkedin.com/company/sun-light-and-power" target="_blank"><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#1155cc">LinkedIn</span></a></span><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#000001"> or our </span><span style="font-size:10.0pt;color:#eaab3b"><a href="https://sunlightandpower.com/" target="_blank"><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#1155cc">website</span></a></span><span style="font-size:9.5pt;font-family:"Arial","sans-serif";color:#000001">.</span><span style="font-size:10.0pt;color:#eaab3b"> </span><span style="color:#222222"></span></p></td></tr></table></td></tr></table></div></div></div><p class="MsoNormal"> </p></div></div></div></div></div></div></div></div></div></body></html>