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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">All -</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">Just a quick follow up to this thread. My understanding is that you can use black USE-2 or PV Wire under the 2008 and 2011 NEC for all grounded and ungrounded 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">2008 NEC has section 200.6(A)(2) Grounded Conductors which reads (it is section 200.6(A)(6) in 2001 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">"A single-conductor, sunlight-resistant, outdoor-rated cable used as a grounded conductor in photovoltaic power systems as permitted by 690.31 shall be identified at the time of installation by distinctive white marking at all terminations"</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">I wonder if the 2014 NEC has any new rules or clarifications on this. </span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">Brian Mehalic listed a requirement in the 2014 NEC for coloring of ungrounded wire of 6 AWG or smaller - does it have an exception for USE-2 or PV Wire or will we need to buy special wire with red marking?</span><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif""> </span></p><p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif"">Best, August</span><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"> </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> Monday, September 23, 2013 9:29 PM<br><b>To:</b> 'RE-wrenches'<br><b>Subject:</b> Re: [RE-wrenches] transformerless inverters and conductor colors</span></p></div></div><p class="MsoNormal"> </p><p class="MsoNormal">
<span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1f497d">It’s my understanding that once one goes into a covered raceway that the double-insulated wire is no longer required.</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">marco</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> [<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Jesse Dahl<br>
<b>Sent:</b> Monday, September 23, 2013 6:12 PM<br><b>To:</b> RE-wrenches<br><b>Subject:</b> Re: [RE-wrenches] transformerless inverters and conductor colors</span></p></div></div><p class="MsoNormal"> </p><div><p class="MsoNormal">
Marco,</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">You said that after your "j-box" you will transition to THHN/THWN. Wouldn't you still need to use PVWire or some type of jacketed cable all the way to the inverter? </p>
</div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Jesse</p></div><div><p class="MsoNormal"><br>Sent from my iPhone</p></div><div><p class="MsoNormal" style="margin-bottom:12.0pt"><br>On Sep 23, 2013, at 4:09 PM, Brian Mehalic <<a href="mailto:brian@solarenergy.org">brian@solarenergy.org</a>> wrote:</p>
</div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><div><p class="MsoNormal">The 2014 NEC addresses this in a change in 215.12(C)(2), "Feeders Supplies from Direct-Current Systems". (There is similar language in 210.5(C)(2) in regards to branch circuits). I know many folks won't be on the 2014 cycle for some time, but at least it is defined now.</p>
<div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Conductors 6 AWG or smaller have to be identified by polarity at all termination, connection, and splice points as in one of 3 ways:</p></div><div><p class="MsoNormal">
</p></div><div><p class="MsoNormal">Ungrounded, positive polarity </p></div><div><p class="MsoNormal">1: red</p></div><div><p class="MsoNormal">2: red stripe along entire length (conductor cannot be white, gray, black or green)</p>
</div><div><p class="MsoNormal">3: "+", "POS", or "POSITIVE" marked at least every 24 inches (again conductor cannot be white, gray, black or green)</p></div><div><p class="MsoNormal"> </p></div>
<div><p class="MsoNormal">Ungrounded, negative polarity</p></div><div><div><p class="MsoNormal">1: black</p></div><div><p class="MsoNormal">2: black stripe along entire length (conductor cannot be white, gray, red or green)</p>
</div><div><p class="MsoNormal">3: "-", "NEG", or "NEGATIVE" marked at least every 24 inches (again conductor cannot be white, gray, red or green)</p></div></div><div><p class="MsoNormal"> </p>
</div><div><p class="MsoNormal">Additionally, the methods used must be documented and "readily available or...permanently posted" at the equipment.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">
Cheers,</p></div><div><div><div><div><p class="MsoNormal">Brian Mehalic <br>NABCEP Certified Solar PV Installation Professional™ R031508-59</p><div><p class="MsoNormal">IREC ISPQ Certified Affiliated Instructor/PV US-0132</p>
<div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">PV Curriculum Developer and Instructor</p><div><p class="MsoNormal">Solar Energy International<br><a href="http://www.solarenergy.org" target="_blank">http://www.solarenergy.org</a></p>
</div></div></div></div></div></div><p class="MsoNormal" style="margin-bottom:12.0pt"> </p><div><p class="MsoNormal">On Mon, Sep 23, 2013 at 3:59 PM, Ray Walters <<a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>> wrote:</p>
<div><div><p class="MsoNormal" style="margin-bottom:12.0pt">Hi Marco;<br><br>Article 200.7 specifically prohibits using white wire for anything but grounded conductors. This came up last year on a large project with an ungrounded array, that also had white incorrectly specified in the plans. The appropriate colors would be red for positive, and black for negative. </p>
<pre>R.Ray Walters</pre><pre>CTO, Solarray, Inc</pre><pre>Nabcep Certified PV Installer, </pre><pre>Licensed Master Electrician</pre><pre>Solar Design Engineer</pre><pre><a href="tel:303%20505-8760" target="_blank">303 505-8760</a></pre>
<p class="MsoNormal">On 9/23/2013 1:27 PM, Marco Mangelsdorf wrote:</p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><p class="MsoNormal" style>Hi all,</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>
We’re doing more and more installs with TL inverters (SMA and P1).</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>I’m using double-insulated wire from the array string to the first enclosure, as in j-box, and then transitioning to standard THHN/THWN wire.</p>
<p class="MsoNormal" style> </p><p class="MsoNormal" style>I recently purchased some of that #10 double-insulated wire, getting a spool of black and white.</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>Then after receiving the two spools it occurred to me: since the array is ungrounded, as far as there being no grounded conductor in the circuit, did I blow it by getting a spool of white wire?</p>
<p class="MsoNormal" style> </p><p class="MsoNormal" style>What sayeth you all? Can I not use that white wire in those array circuits for TL inverters?</p><p class="MsoNormal" style> </p><p class="MsoNormal" style>Thanks,</p>
<p class="MsoNormal" style>marco</p><p class="MsoNormal" style> </p></div><p class="MsoNormal" style="margin-bottom:12.0pt"> </p><pre>_______________________________________________</pre><pre>List sponsored by Home Power magazine</pre>
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