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--></style></head><body lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Marco,</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:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">My understanding is that PV wire is a separate listing. Exposed DC wiring with ungrounded non-isolated systems must be PV wire. USE-2 wire is not necessarily PV wire unless listed and labeled as PV wire. Here's a decent article:</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><a href="http://www.renewableenergyworld.com/rea/news/article/2010/11/performancecost-trade-offs-in-pv-systems-wiringcabling-selection">http://www.renewableenergyworld.com/rea/news/article/2010/11/performancecost-trade-offs-in-pv-systems-wiringcabling-selection</a></p>
<p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Best, August</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d"> </span></p>
<div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><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""> <a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a> [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Marco Mangelsdorf<br>
<b>Sent:</b> Friday, September 27, 2013 12:24 AM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> [RE-wrenches] transformerless inverters and conductor colors</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">
<span style="font-size:11.0pt">Thanks, Glen.</span></p><p class="MsoNormal"><span style="font-size:11.0pt"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt">This brings up the question of what exactly constitutes “PV Wire.” “PV wire” does not necessarily = double-insulated wire which I thought is required with ungrounded PV systems on the DC side at least until you hit an enclosure and enclosed raceway where you can transition to THWN-2 wire. Is there a clear and unambiguous definition out there of what constitutes “PV Wire”? To some XLP/USE-2/RHW-2 wire is “PV Wire.”</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span></p><p class="MsoNormal"><span style="font-size:11.0pt">marco</span><span style="font-size:10.0pt"></span></p><p class="MsoNormal"> </p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">2008 NEC</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:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">690.35 Ungrounded Photovoltaic Power Systems.</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Photovoltaic power systems shall be permitted to operate with ungrounded photovoltaic source and output circuits where the system complies with 690.35(A) through (G).</span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(A) Disconnects.</span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(B) Overcurrent Protection. </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(C) Ground-Fault Protection. </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(D) The photovoltaic source conductors shall consist of the following: </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(1) Nonmetallic jacketed multiconductor cables </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(2) Conductors installed in raceways, or </span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">(3) Conductors listed and identified as Photovoltaic (PV) Wire installed as exposed, single conductors.</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:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Raceway. An enclosed channel of metal or nonmetallic materials designed expressly for holding wires, cables, or busbars, with additional functions as permitted in this Code. Raceways include, but are not limited to, rigid metal conduit, rigid nonmetallic conduit, intermediate metal conduit, liquidtight flexible conduit, flexible metallic tubing, flexible metal conduit, electrical nonmetallic tubing, electrical metallic tubing, underfloor raceways, cellular concrete floor raceways, cellular metal floor raceways, surface raceways, wireways, and busways.</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:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Reads to me like you can transition to THWN-2 inside a rooftop jbox from the PV wire under the modules, as long as it is in a raceway.</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:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">-Glenn Burt</span> </p>
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