<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div style="-webkit-text-size-adjust: auto; ">I think there are a variety of ways to meet the listing. See this link:</div><div style="-webkit-text-size-adjust: auto; "><br></div><div style="-webkit-text-size-adjust: auto; "><span style="font-family: '.HelveticaNeueUI'; font-size: 15px; line-height: 19px; white-space: nowrap; -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); -webkit-text-size-adjust: none; "><a href="http://www.ul.com/asiaonthemark/as-en/2009-Issue30/page1.htm">http://www.ul.com/asiaonthemark/as-en/2009-Issue30/page1.htm</a></span></div><div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);"><br></span></font></div><div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">Cheers,</span></font></div><div><font face=".HelveticaNeueUI"><span style="font-size: 15px; line-height: 19px; white-space: nowrap; -webkit-tap-highlight-color: rgba(26, 26, 26, 0.292969); -webkit-composition-fill-color: rgba(175, 192, 227, 0.230469); -webkit-composition-frame-color: rgba(77, 128, 180, 0.230469);">Brian<br></span></font><br><span style="-webkit-text-size-adjust: auto;">Typos courtesy of my iPhone. </span></div><div style="-webkit-text-size-adjust: auto; "><br>On Jun 3, 2013, at 12:45 PM, Brian Teitelbaum <<a href="mailto:bteitelbaum@aeesolar.com">bteitelbaum@aeesolar.com</a>> wrote:<br><br></div><blockquote type="cite" style="-webkit-text-size-adjust: auto; "><div><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"><meta name="Generator" content="Microsoft Word 14 (filtered medium)"><style><!--
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</o:shapelayout></xml><![endif]--><div class="WordSection1"><p class="MsoNormal">Esteemed Wrenches,<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">We are having a hard time finding a source of PV Wire with a 1000V rating that will fit into a two-hole 1/2" strain relief. It seems that all of the wire brands that are “double-insulated” just have too large of a diameter to get two of them though a 1/2" strain relief, needed since most common combiners have 1/2" knockouts for wire entry. However, we have found a source of single-insulated wire that is UL Listed and bears the “PV Wire” marking.<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">I’ve always been under the assumption that “double-insulated wire” was necessary when using transformerless grid-tie inverters, as it is with power tools that only have two-prong plugs on them. However I can’t find that specific language in the Code. It just says “must be marked as PV Wire”. I also found this quote about PV Wire from John Wiles (underlining mine):<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">“The thickness is specified and there may be <u>one or two layers</u> of insulation. The insulation must pass an accelerated UV test of 720 hours and will be<o:p></o:p></p><p class="MsoNormal">marked “Sunlight Resistant.” PV cable/PV wire also has smoke and flame-retardants and may be used inside conduit inside buildings. In the U.S., it should<o:p></o:p></p><p class="MsoNormal"><u>not be called a ‘double-insulated cable’</u> as that is a purely European term.”<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">This appears to mean that double-insulation is not required for transformerless (non-isolated) inverters; just that it needs to be marked as “PV Wire”. Can anyone here confirm, hopefully with documentation, that actually having “double-insulation” is not required when using non-isolated inverters?<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal">Thanks<o:p></o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><o:p> </o:p></p><p class="MsoNormal"><span style="font-size:12.0pt">Brian Teitelbaum <o:p></o:p></span></p><p class="MsoNormal"><span style="font-size:12.0pt">AEE Solar<o:p></o:p></span></p></div></div></blockquote><blockquote type="cite" style="-webkit-text-size-adjust: auto; "><div><span>_______________________________________________</span><br><span>List sponsored by Home Power magazine</span><br><span></span><br><span>List Address: <a href="mailto:RE-wrenches@lists.re-wrenches.org">RE-wrenches@lists.re-wrenches.org</a></span><br><span></span><br><span>Change email address & settings:</span><br><span><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List-Archive: <a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</a></span><br><span></span><br><span>List rules & etiquette:</span><br><span><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></span><br><span></span><br><span>Check out participant bios:</span><br><span><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></span><br><span></span><br></div></blockquote></body></html>