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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>All –<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>PVC doesn’t hold up well in the Bay Area – Here’s
a photo of some ~4 year old PVC browned PVC from Marin County:<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><img width=341 height=150 id="Picture_x0020_0"
src="cid:image002.jpg@01CA48DF.F8EAE150" alt="PVC (Small).jpg"></span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>You can see that the straps melted resulting in the conduit
sliding down. Thank goodness we didn’t install this. PCV seems like a
good option for shaded areas. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As Bill pointed out, if we use EMT we need to bond both ends of
the conduit to comply with NEC 250.97. My issue is that it is hard to find
outdoor rated bonding bushings – that’s why we’ve just been
installing cast metal boxes with threaded connections (complies with NEC 250.92(B)(2)).<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>As William point out, EMT is robust and reliable. I still think
that there must be more efficient way to go between arrays. Maybe that’s
why commercial low profile racking systems are often fully integrated systems
with built in wire raceways.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>-August<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>August Goers<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Luminalt Energy Corporation<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>O: 415.564.7652<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>M: 415.559.1525<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>F: 650.244.9167<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>august@luminalt.com<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<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"'>
re-wrenches-bounces@lists.re-wrenches.org
[mailto:re-wrenches-bounces@lists.re-wrenches.org] <b>On Behalf Of </b>William
Miller<br>
<b>Sent:</b> Friday, October 09, 2009 12:07 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Rooftop wiring methods between multiple
subarrays<o:p></o:p></span></p>
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<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Ray:<br>
<br>
Good question. We do use PVC in coastal zones to avoid corrosion.
We try to keep it in the shade, paint it where exposed to UV and support it in
close intervals.<br>
<br>
William<br>
<br>
<br>
At 10:57 AM 10/9/2009, you wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>Except for coastal installations.... where EMT is
NOT recommended outdoors, PVC browns out and warps, and we should
therefore use product X???<br>
<br>
R. Walters<br>
<a href="mailto:ray@solarray.com">ray@solarray.com</a><br>
Solar Engineer<br>
<br>
<br>
<br>
<br>
On Oct 9, 2009, at 11:38 AM, William Miller wrote:<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal style='margin-bottom:12.0pt'>August:<br>
<br>
I suggest the use of EMT with proper fittings to protect high voltage, high
amperage DC Wiring on rooftops. Sure it is time consuming, but high
quality, reliable craftsmanship will always be thus.<br>
<br>
William Miller<br>
<br>
<br>
<br>
<o:p></o:p></p>
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