<div dir="ltr"><div dir="ltr">Hi William,<div><br></div><div>Yes, the bulletin I attached was just an example of a 100% rated disconnect (which happened to be DC since that's the one I had handy!). My understanding is that most of the NON-fused Square D switches are rated for 100%.</div><div><br></div><div>See this FAQ from the manufacturer: <a href="https://www.schneider-electric.us/en/faqs/FA237949/">https://www.schneider-electric.us/en/faqs/FA237949/</a>, quoted below:</div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><strong style="box-sizing:border-box;color:rgb(0,0,0);font-family:ArialRoundedMTforSE_Latin,Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:14px">Resolution:<br></strong><span style="color:rgb(0,0,0);font-family:ArialRoundedMTforSE_Latin,Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:14px">All General Duty, Heavy Duty or Double Throw Safety Switches maximum current rating, either 80% or 100% of the nameplate rating, depends on if the switch is Fusible or NON-Fusible.</span><ul style="box-sizing:border-box;padding:0px;margin:0px;list-style:none;color:rgb(0,0,0);font-family:ArialRoundedMTforSE_Latin,Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:14px"><li style="box-sizing:border-box;list-style:circle inside;margin-left:1em">Fusible switches are rated to carry up to 80% of the amp rating of the fuses installed in the switch</li></ul><ul style="box-sizing:border-box;padding:0px;margin:0px;list-style:none;color:rgb(0,0,0);font-family:ArialRoundedMTforSE_Latin,Arial,"Helvetica Neue",Helvetica,sans-serif;font-size:14px"><li style="box-sizing:border-box;list-style:circle inside;margin-left:1em">Non-fusible (unfused) switches are rated to carry 100% of the switch nameplate ampere rating</li></ul></blockquote><div><br></div><div> Regarding this point:</div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span style="color:rgb(31,73,125);font-family:Verdana,sans-serif">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> </blockquote><div><br></div><div>I believe the original poster was asking about a 6000W inverter with 25A max output. So in that case you could use a 100% rated non-fusible disconnect, because the max current is only 25A. (The required 40A breaker is sized larger because commonly available breakers are only 80% rated, not 100%. But the max current is still only 25A.) See 690.8(A) for calculation of maximum circuit current, specifically section (3) for inverters: "The maximum current shall be the inverter continuous output current rating." (Not "the inverter continuous output current multiplied by 1.25.")</div><div> </div><div>Best,</div><div>Blake</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Aug 21, 2019 at 10:59 PM William Miller <<a href="mailto:william@millersolar.com">william@millersolar.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang="EN-US"><div class="gmail-m_-9000042600123495818WordSection1"><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">Blake:</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">(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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">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:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">William Miller</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">805-438-5600</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><a href="http://www.millersolar.com/" target="_blank"><span style="color:blue">www.millersolar.com</span></a></span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">CA Lic. 773985</span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-size:8pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">Quote of the month: \u201cAs they age, batteries transition from energy </span></p><p class="MsoNormal"><span style="font-size:8pt;font-family:Arial,sans-serif;color:rgb(31,73,125)">storage devices to energy consuming devices.\u201c W. Miller</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><b><span style="font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b><span style="font-size:10pt;font-family:Tahoma,sans-serif"> RE-wrenches [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>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" target="_blank">greg@remotepowerinc.com</a>> wrote:</p></div><blockquote style="border-top:none;border-right:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;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? 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