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I've tested really old arrays that were done in the days before NEC
grounding requirements. No star washers, just nuts, bolts, lock
washers and washers. I've never seen significant resistance from
one end of an array to the other. This appears to be a solution to
solve a problem that never existed in the first place, that caused a
problem! (The main cause of problems are solutions). <br><br>
That being said, Weeb type clips may be a good idea for top mounting
hardware. <br><br>
<br>
At 05:20 PM 7/13/2011, you wrote:<br>
<blockquote type=cite class=cite cite="">Hi Guys;<br><br>
The islands have accelerated corrosion, but we will see the same problems
even in dry climates, it just might take decades instead of years. I
think galvanic corrosion of AL and CU is such a problem that we should
use the new products available such as the WEEB, and take advantage of
the clarified grounding requirements in NEC 2011.<br>
Basically I think the days of bare #6 CU running all over the array
modules and framing should be over. It was time and money consuming,
caused unnecessary corrosion, and looked bad, plus was it ever really
safer?<br>
My own ground impedance testing says no. The most impedance is usually
found at the connection from the grounding electrode to the earth itself,
not at the array.<br><br>
Ray Walters<br><br>
On 7/13/2011 2:46 PM, Marv Dargatz wrote: <br>
<blockquote type=cite class=cite cite="">Drake,<br>
<br>
This is a HUGE problem. If you want a real earful, talk to John
Wiles, Bill Brooks, or Greg Ball about this.<br>
<br>
While you might think that the anodizing on the aluminum would prevent
electrical contact to the copper, it doesn’t last long with just a little
vibration (usually due to wind). Put this in a coastal environment,
and things go bad in a hurry, often in less than one year. Any
island environment is especially bad.<br>
<br>
<br>
See ya!<br>
<br>
Marv<br>
Director of Technology and Support, North America<br>
<b>SolarEdge Technologies, Inc.<br>
</b>Tech Support Mobile: +530.798.6770<br>
Mobile: +530.392.0356<br>
<br>
<b>From:</b>
<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">
re-wrenches-bounces@lists.re-wrenches.org</a>
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">
mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of
</b>Drake<br>
<b>Sent:</b> Wednesday, July 13, 2011 1:26 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> [RE-wrenches] Fwd: Re: Aluminum Module Frame To
Galvanized Uni-Strut<br>
<br>
<dl><br>
<dd>Marv,<br><br>
<dd>It is common practice to run bare copper ground wire over rails and
under modules, which will touch the aluminum at various points. How
much of a problem is this going to create in the long run?<br><br>
<dd>Drake <br><br>
</dl><br>
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<font size=2>Drake
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