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The super flex of the SOWA cable would be the best option I
believe. I had heard that it is not approved for permanent
installs, but 690.31(E) appears to explicitly allow the use of this
cable type for trackers, so I think Dana's described method is the
way to go, certainly better than my old method.<br>
<br>
<pre class="moz-signature" cols="72">R.Ray Walters
CTO, Solarray, Inc
Nabcep Certified PV Installer,
Licensed Master Electrician
Solar Design Engineer
303 505-8760</pre>
<div class="moz-cite-prefix">On 12/1/2015 10:25 AM, Dana wrote:<br>
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<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black">We install
the array junction box (with breakers) on the upper portion
of the tracker & use SOWA cord for the drop with strain
relief on both ends. The lower box has the conduit back to
the power center or building breaker for Grid tie. Check
with your AHJ but this cord is sunlight-oil-gas rated, &
comes in many gauges. Probably not the least expensive
option but never had one fail in 20+ years. Allow enough for
a full rotation but not so much it gets flailing about in
the wind. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black">I build my
own extension cords using the same and have cord that has
been on job sites for 20 years now. Again, not cheap but
they last & last. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black">I have
replaced various flex non metallic seal tight conduit
installations by others when it has cracked. Also at cold
temps the nmst flex conduit does not bend very happily.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black"><o:p> </o:p></span></p>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Century
Gothic","sans-serif";color:#002060">----------------------------------------------------------------------------<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black">Dana
Orzel <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black">Great
Solar Works, Inc - NABCEP # 051112-136<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black">E -
<a class="moz-txt-link-abbreviated" href="mailto:dana@solarwork.com">dana@solarwork.com</a> - Web - solarwork.com <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black">O -
970.626.5253 C - 208.721.7003<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black">"Responsible
Technologies for Responsible People since 1988" </span><span
style="font-size:10.0pt;font-family:"Century
Gothic","sans-serif";color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span
style="font-size:14.0pt;font-family:"Century
Gothic","sans-serif";color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
RE-wrenches
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>Ray Walters<br>
<b>Sent:</b> Monday, November 30, 2015 8:35 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Wire management dual
axis tracker<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We used to just bundle the PV cables and
secure them close to the pivot point at both the rack and the
pole with insulated wire loom clamps. We always made a big
enough loop to handle full articulation, but not too long so
they wouldn't catch on the Combiner box, etc. We also started
using braided ground strap, instead of stranded #6. Braided
is made for movement, stranded #6 would strain harden and
break off at the connector.<br>
I'm not sure how flex conduit would do. It definitely could
break out of a plastic J box, I would think. The back and
forth motion eventually wears out things not really made to
move. I had lots of trouble with this issue.<br>
Finally, don't be greedy on tracker settings, I'd keep the
total range of motion to less than a full 180 degrees Azimuth,
and probably limit the tilt some too. <br>
<br>
<o:p></o:p></p>
<pre>R.Ray Walters<o:p></o:p></pre>
<pre>CTO, Solarray, Inc<o:p></o:p></pre>
<pre>Nabcep Certified PV Installer, <o:p></o:p></pre>
<pre>Licensed Master Electrician<o:p></o:p></pre>
<pre>Solar Design Engineer<o:p></o:p></pre>
<pre>303 505-8760<o:p></o:p></pre>
<div>
<p class="MsoNormal">On 11/30/2015 8:21 PM, Mac Lewis wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Hi Wrenches, <o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">I'm looking for advice on the best
way(s) to secure PV source circuit wiring on a dual axis
tracker. I've never wired one up before and it seems
tricky. This particular tracker is 12 modules, 3
strings. Is it best to run a flexible conduit up the
pole and leave plenty of excess conduit to create large
loops that fluctuate in size throughout the day? What
are some other ideas? How do you avoid abrasion over
time? <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks in advance<br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal" style="margin-bottom:12.0pt">Mac
Lewis<b><span
style="font-family:"Arial","sans-serif";color:#FF9900"><o:p></o:p></span></b></p>
<p><span style="color:#305A78">"Yo solo sé que no sé
nada." </span><b><span style="color:#686868">-Sócrates</span></b><b><span
style="font-family:"Arial","sans-serif";color:#FF9900"><o:p></o:p></span></b></p>
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