<div dir="ltr">I don't understand the reference to Arc-Flash. Arc-flash ratings are dependent on high current potential, typically above 700 amp short circuit current. I don't think you can get an arc flash from a solar system as solar is inherently current limited. </div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Oct 6, 2014 at 2:40 PM, William Miller <span dir="ltr"><<a href="mailto:william@millersolar.com" target="_blank">william@millersolar.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:12.0pt;font-family:"Arial","sans-serif"">Wrenches:<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">We are getting up to speed on using transformer-less inverters. I have advocated long for the additional safety offered by these inverters but I am realizing the trade-offs with the new technology: The implementation gets more complicated with the requirement for PV wire, OCPD and disconnecting means for plus and minus and plus providing Arc Flash rated equipment.<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">I am currently designing a system that will locate the PV about 400 feet from the residence. The system will utilize 2 Solectria 5200 watt inverters at the residence. I would like to provide disconnecting means for the 4 strings at the array, in case of any needed service or excavating. Preferably I’d like the disconnecting means to be deployable by a lay person (i.e. the gardener).<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Finding an 8 pole, arc flash, 600 VDC rated disconnect is not easy. I could install an Outback 8 circuit combiner with 8 touch-safe fuse holders. The new combiners have had dead-fronts for a while now. The gardener needs only to have a Philips screw driver to open this cover. Any better ideas out there?<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">Thanks,<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif"">William<u></u><u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Arial","sans-serif""><u></u> <u></u></span></p><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><img width="64" height="28" src="cid:image002.jpg@01CFE15A.441B74B0" alt="Gradient Cap_mini"><br>Lic 773985<br></span><a href="http://www.millersolar.com/" target="_blank"><span style="font-size:10.0pt;font-family:"Arial","sans-serif"">millersolar.com</span></a><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:black"><br><a href="tel:805-438-5600" value="+18054385600" target="_blank">805-438-5600</a><u></u><u></u></span></p><p class="MsoNormal"><u></u> <u></u></p></div></div><br>_______________________________________________<br>
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div dir="ltr">Chris Mason<div><div style="color:rgb(136,136,136)"><span style="font-size:13px">NABCEP Certified Solar PV Installer™</span></div><div style="color:rgb(136,136,136)"><span style="color:rgb(34,34,34)">Solar Design Engineer</span></div><div style="color:rgb(136,136,136)"><span style="font-size:13px">Generac Generators Industrial technician</span></div></div><div style="color:rgb(136,136,136)"><span style="font-size:13px"><br></span></div><div><a href="http://www.cometenergysystems.com" target="_blank">www.cometsolar.com</a></div><div>264.235.5670</div><div>869.662.5670</div><div>Skype: netconcepts</div></div>
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