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I think an important point, is not to connect to their system in
more than one place. You don't want to create any loops that would
pick up the induced current from a lightning strike. We've bonded
to the lightning rod systems at their attachment to ground. The
idea being that if their system takes a strike, you wouldn't want
any of that current taking a parallel path through the solar
equipment to ground. <br>
The opposite argument is that you don't want large potential
voltages between the array and their lightning rods in a strike. I
don't subscribe to this though, and think that limiting current flow
through the equipment and then using Midnite surge suppressors to
bleed voltage to ground is better. Its difficult to test these
theories though, so it begins to fall almost into the realm of
religion. None of us completely understand lightning.<br>
Either way, I highly recommend bonding the grounding system to a
steel cased well and/or the rebar in the foundation (Ufer ground) <br>
The lower the impedance of the actual grounding electrode system,
the better: that we can all agree on. <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 6/4/2015 12:03 PM, Garrison Riegel
wrote:<br>
</div>
<blockquote
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<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D">Wrenches,<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">Does
anyone have any best practice recommendations (or books,
articles, etc) for integrating a roof mounted PV system with
a lightning protection system? Bare #6 copper and a split
bolt to the braided copper connecting air terminals? At
both ends of the array?<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">Or
should we not bond these systems on the roof? Opinions on a
2009 Wrenches thread varied, but I’ve heard it from a few
sources that these should be bonded directly. Wondering if
there is a general consensus at this point? Or strong
opinions one way or the other?<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">Thanks
for your thoughts.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">Garrison
Riegel<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">PV
Operations Manager | </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a
moz-do-not-send="true"
href="http://www.solarserviceinc.com/"><i><span
style="color:#222A35">Solar Service Inc</span></i></a></span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">[p]
847-677-0950 | </span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><a
moz-do-not-send="true"
href="mailto:garrison@solarserviceinc.com"><span
style="color:#44546A;text-decoration:none">garrison@solarserviceinc.com</span></a></span><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif;color:#44546A">NABCEP
Certified PV Installation Professional™<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"><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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