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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>William –<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'>I agree with you about a no-shortcuts and full workmanship plan
of attack. That is how we will all stay in business and continue to make local
scale PV a success. However, when we dissect the details of running between
multiple array sections I still don’t see a good solution. I’m glad
to use EMT or aluminum or stainless conduit but there are several code questionable
violations which we must address. If we’re using a metal raceway we need
to address bonding. How do we bond both ends of the conduit? How do we run our
ground wire through this raceway? Is it okay if the copper wire touches the conduit?
How do we bond the conduit to actually meet NEC requirements? I’m
starting to think that the NEC doesn’t have the answers…<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>
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<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 5:31 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>Colleagues:<br>
<br>
I think the correct answer is: there are no short cuts to good
workmanship. It requires intelligent design, a judicious selection of
materials and careful installation. EMT is appropriate in low corrosion
environments, PVC if you can control UV damage and accommodate expansion.
There are aluminum and stainless conduits for the extreme environments and
demanding aesthetics. I am sorry that there are no easy ways to pursue
quality.<br>
<br>
It is my understanding that the European model is to "plug and pray"
with quick connect cables, running them across roof tops and stapling them to
exterior walls. I don't know this for a fact, but if it is true, I hope
that market does not drive the US market towards reduced standards. I
belive it is short sighted to skimp on wiring methods with dangerous power
feeds. I think the loss of conduit boxes on modules is a direct result of
European installation techniques and a trend towards reducing labor costs.
I welcome information from those of you with experience in other markets to
verify these hunches.<br>
<br>
William Miller<br>
<br>
<br>
<br>
At 04:21 PM 10/9/2009, you wrote:<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal>EMT needs to be "pickled" with vinegar or
acid, to get the paint to hold. I love it for inland work, but near the ocean,
it'll rust through in 5 years. I'm not sure how much more time paint would buy
you.<br>
Anybody use other plastic materials HDPE? Supposed to not have the expansion
problems of PVC.<br>
<br>
<br>
R. Walters<br>
<a href="mailto:ray@solarray.com">ray@solarray.com</a><br>
Solar Engineer<br>
<br>
<br>
<br>
<o:p></o:p></p>
<p class=MsoNormal><br>
If you have to run around the roof with EMT, you can protect it from rust<br>
with a coat of paint.<br>
<br>
Regards,<br>
-Hans<o:p></o:p></p>
<p><u>Please note new e-mail address and domain:<br>
<br>
</u>William Miller <br>
Miller Solar<br>
Voice :805-438-5600 Fax: 805-438-4607 <br>
email: william@millersolar.com<br>
<a href="http://millersolar.com/">http://millersolar.com<br>
</a>License No. C-10-773985<o:p></o:p></p>
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