<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>Marco- You should not transition to THHN wire at all for the DC run. The PV wire is double insulated for a good reason- the transformerless inverters are such suckers for a ground fault that they need the extra protection. That's why the NEC specifies PV wire. </div><div>I recently did an installation like you wrote, with a transition at the j-box. This developed an intermittent ground fault when wet, and when the P1 inverter failed it was deemed out of warranty. Learn from my mistake-- use PV wire all the way to the inverter. </div><div><br></div><div>That said, does anyone know where to get 1000 volt PV wire in colors other than red, black, and white?</div><div>It would be nice to color code the positive runs like is possible with colors of THHN.</div><div>I'm thinking of buying spools of white and spraying plastic paint on them for a striped color coding.<br></div><div><br></div><div>Don Barch</div><div>Energy Solar</div><div><br></div><div><br></div><blockquote id="replyBlockquote" webmail="1" style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;" mce_style="border-left: 2px solid blue; margin-left: 8px; padding-left: 8px; font-size:10pt; color:black; font-family:verdana;"><div id="wmQuoteWrapper">
Message: 3<br>
Date: Mon, 23 Sep 2013 09:27:30 -1000<br>
From: "Marco Mangelsdorf" <<a href="mailto:marco@pvthawaii.com">marco@pvthawaii.com</a>><br>
To: "'RE-wrenches'" <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
Subject: [RE-wrenches] transformerless inverters and conductor colors<br>
Message-ID: <000001ceb892$f3e41470$dbac3d50$@com><br>
Content-Type: text/plain; charset="us-ascii"<br>
<br>
Hi all,<br>
<br>
We're doing more and more installs with TL inverters (SMA and P1).<br>
<br>
I'm using double-insulated wire from the array string to the first<br>
enclosure, as in j-box, and then transitioning to standard THHN/THWN wire.<br>
<br>
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