<div dir="ltr">What about the capacitors on the dc side of the inverter? My assumption has been that this capacitance is the reason behind the 690.17(E) labeling requirement. Admittedly I don't understand the discharge capabilities of capacitors, but I've measured their voltage and watched it decay when disconnected from a power source (and heard stories about "toss the capacitive-laden ballast to the newbie ha ha...). <div>
<br></div><div>So the question is, say for a of a roof mounted array and a ground-level string inverter, will additional equipment (either in the inverter or external) be required to isolate the PV/dc circuit conductors from the inverter in order to meet 690.12? </div>
</div><div class="gmail_extra"><br clear="all"><div><div dir="ltr"><div><br></div><div>Brian Mehalic <br>NABCEP Certified Solar PV Installation Professional™ R031508-59<div>IREC ISPQ Certified Affiliated Instructor/PV US-0132<br>
<div><br></div><div>PV Curriculum Developer and Instructor<div>Solar Energy International<br><a href="http://www.solarenergy.org" target="_blank">http://www.solarenergy.org</a></div></div></div></div></div></div>
<br><br><div class="gmail_quote">On Tue, Jan 21, 2014 at 8:45 PM, Bill Brooks <span dir="ltr"><<a href="mailto:billbrooks7@yahoo.com" target="_blank">billbrooks7@yahoo.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<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">Brian,<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">The requirement is generic. A listed contactor can meet the requirement. A standard is only necessary for products that want to be innovative in meeting the 30V, 240VA. Killing all power is an option with existing listed equipment. NEC 90.4 does not apply.<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">Bill.<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><div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri","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>Brian Mehalic<br>
<b>Sent:</b> Tuesday, January 21, 2014 2:36 PM<br><b>To:</b> RE-wrenches<br><b>Cc:</b> <a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a></span></p><div><div class="h5">
<br><b>Subject:</b> Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown<u></u><u></u></div></div><p></p></div></div><div><div class="h5"><p class="MsoNormal"><u></u> <u></u></p><div><p class="MsoNormal">It was suggested to me that since 690.12(5) requires the equipment to be listed and identified, and there is no standard for rapid shutdown equipment to be listed to then 90.3 (.4?...oh why isn't the NEC on my iPad...)says 'revert to the previous version of the NEC' and presto, no need to install rapid shutdown. I don't like this but the the person suggesting it certainly has an audience and this will appeal to installers looking to save on cost wherever possible. <br>
<br>Sent from my iPad<u></u><u></u></p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>On Jan 21, 2014, at 5:11 PM, David Brearley <<a href="mailto:david.brearley@solarprofessional.com" target="_blank">david.brearley@solarprofessional.com</a>> wrote:<u></u><u></u></p>
</div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal">Drake,<u></u><u></u></p><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">The language in 690.12 is the compromise solution that was reached to ensure continued industry stability. The alternative to the combiner-level shutdown was module-level shutdown. It took a consolidated industry effort to push the module-level requirements out one more Code cycle—for the exact reasons that you touch on below. <u></u><u></u></p>
</div><div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal">Not sure if this link has been published on the Wrenches list or not, but it provides some background on the topic:<u></u><u></u></p></div>
<div><p class="MsoNormal"><u></u> <u></u></p></div><div><p class="MsoNormal"><a href="http://www.youtube.com/watch?v=sUXShMZJorQ" target="_blank">http://www.youtube.com/watch?v=sUXShMZJorQ</a><u></u><u></u></p></div><div>
<p class="MsoNormal"><u></u> <u></u></p></div><div><div><div><div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">David Brearley<u></u><u></u></span></p></div>
<div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Senior Technical Editor,<span> </span><i>SolarPro</i><span> </span>magazine<u></u><u></u></span></p></div><div>
<p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">NABCEP Certified PV Installation Professional<u></u><u></u></span></p></div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><a href="mailto:david.brearley@solarprofessional.com" target="_blank">david.brearley@solarprofessional.com</a><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Direct: <a href="tel:541.261.6545" value="+15412616545" target="_blank">541.261.6545</a><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><u></u> <u></u></span></p></div></div><p class="MsoNormal"><u></u> <u></u></p></div><p class="MsoNormal" style="margin-bottom:12.0pt">
<u></u> <u></u></p></div><p class="MsoNormal"><u></u> <u></u></p><div><div><p class="MsoNormal">On Jan 21, 2014, at 1:12 PM, <a href="mailto:re-wrenches-request@lists.re-wrenches.org" target="_blank">re-wrenches-request@lists.re-wrenches.org</a> wrote:<u></u><u></u></p>
</div><p class="MsoNormal"><br><br><u></u><u></u></p><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#7f7f7f">From:<span> </span></span></b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Drake <<a href="mailto:drake.chamberlin@redwoodalliance.org" target="_blank">drake.chamberlin@redwoodalliance.org</a>><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#7f7f7f">Subject:<span> </span></span></b><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">Re: [RE-wrenches] NEC 2014 690.12 Rapid Shutdown</span></b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#7f7f7f">Date:<span> </span></span></b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">January 21, 2014 11:36:15 AM CST<u></u><u></u></span></p>
</div><div><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#7f7f7f">To:<span> </span></span></b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><u></u><u></u></span></p>
</div><div><p class="MsoNormal"><b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif";color:#7f7f7f">Reply-To:<span> </span></span></b><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif"">RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">re-wrenches@lists.re-wrenches.org</a>><u></u><u></u></span></p>
</div><p class="MsoNormal"><span style="font-size:13.5pt;font-family:"Helvetica","sans-serif""><br><br><br><span>Bill,</span><br><span> </span><br><span>It is good to see that energized conductors are going to be disconnected near the arrays. I've been an advocate of disconnecting these conductors by ground fault sensing equipment since ground fault detection was first implemented in the code. If contactors are to be installed on roofs, it likely won't be long before both ground faults and arc faults are automatically cleared.</span><span> </span><br>
<span> </span><br><span>When the requirement for AC arc fault branch circuit protection was first put in the NEC, it was postdated to allow time for the electrical industry to adapt. This new remote disconnecting requirement does not provide any lead time. </span><span> </span><br>
<span> </span><br><span>As the 2014 NEC is adopted in various jurisdictions, inspectors may feel that it is necessary to disallow systems without the newly required disconnect feature. This may result in serious problems for solar companies and customers, as well as manufacturers.</span><span> </span><br>
<span> </span><br><span>The protection of firefighters is essential. The implementation of renewables is essential also. Insurance claims for weather related, global warming-triggered climatic disasters are rising exponentially. Extreme weather related events result in major loss of life and billions of dollars in property damage. Atmospheric CO2 levels continue to climb from the burning of fossil fuels. This is a crisis of global proportions.</span><span> </span><br>
<span> </span><br><span>My request for code writers is to please take into account the effect that inserting new rules into the NEC may have on the stability of renewable energy, and implement new requirements in a way that will allow for a smooth interface.</span><br>
<span> </span><br><span>Thank you,</span><span> </span><br><span> </span><br><span>Drake</span><span> </span><br><br><span>Drake Chamberlin</span><br><span><i>Athens Electric LLC</i></span><i><br><span>OH License 44810</span><br>
<span>CO License 3773</span><br><span>NABCEP Certified Solar PV</span><span> </span><br><span><a href="tel:740-448-7328" value="+17404487328" target="_blank">740-448-7328</a></span><br></i><span><a href="http://athens-electric.com/" target="_blank">http://athens-electric.com/</a></span></span><u></u><u></u></p>
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