<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>Marco,</div><div><br></div><div>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? </div><div><br></div><div>Jesse</div><div><br>Sent from my iPhone</div><div><br>On Sep 23, 2013, at 4:09 PM, Brian Mehalic <<a href="mailto:brian@solarenergy.org">brian@solarenergy.org</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr">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.<div>
<br></div><div>Conductors 6 AWG or smaller have to be identified by polarity at all termination, connection, and splice points as in one of 3 ways:</div><div><br></div><div>Ungrounded, positive polarity </div><div>1: red</div>
<div>2: red stripe along entire length (conductor cannot be white, gray, black or green)</div><div>3: "+", "POS", or "POSITIVE" marked at least every 24 inches (again conductor cannot be white, gray, black or green)</div>
<div><br></div><div>Ungrounded, negative polarity</div><div><div>1: black</div><div>2: black stripe along entire length (conductor cannot be white, gray, red or green)</div><div>3: "-", "NEG", or "NEGATIVE" marked at least every 24 inches (again conductor cannot be white, gray, red or green)</div>
</div><div><br></div><div>Additionally, the methods used must be documented and "readily available or...permanently posted" at the equipment.</div><div><br></div><div>Cheers,</div><div class="gmail_extra"><div><div dir="ltr">
<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 Mon, Sep 23, 2013 at 3:59 PM, Ray Walters <span dir="ltr"><<a href="mailto:ray@solarray.com" target="_blank">ray@solarray.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div text="#000000" bgcolor="#FFFFFF">
<div>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. <br>
<pre cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
<a href="tel:303%20505-8760" value="+13035058760" target="_blank">303 505-8760</a></pre>
On 9/23/2013 1:27 PM, Marco Mangelsdorf wrote:<br>
</div>
<blockquote type="cite">
<div>
<p class="MsoNormal">Hi all,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">We’re doing more and more installs with TL
inverters
(SMA and P1).<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">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.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">I recently purchased some of that #10
double-insulated wire,
getting a spool of black and white.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">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?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">What sayeth you all? Can I not use that
white wire in
those array circuits for TL inverters?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks,<u></u><u></u></p>
<p class="MsoNormal">marco<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
</div>
<br>
<fieldset></fieldset>
<br>
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