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<font size=3>Bill:<br><br>
I suppose cheap lattice would do the job, but I can't seem to get
comfortable with the idea aesthetically. When installing PV, I keep
the mind set that I am installing an industrial power generating
system. You would not see cheap materials or un-workman-like
practices at a commercial power generating plant, and so I don't allow
that on my installs.<br><br>
I use aluminum for shielding. I have used sheet aluminum and
expanded aluminum. It is not that hard to bond. For expanded
aluminum, I use a dual-rated split bolt on one of the webs (with
no-alox), and for sheet aluminum, I use WEEB clips.<br><br>
See photos about half way down the page here:
<a href="http://millersolar.com/practices/Technical_Procedures/PV_wiring/PV_wiring.html" eudora="autourl">http://millersolar.com/practices/Technical_Procedures/PV_wiring/PV_wiring.html</a><br><br>
William<br><br>
<br><br>
<br><br>
At 02:57 PM 10/21/2010, you wrote:<br>
<blockquote type=cite class=cite cite>Drake,<br><br>
I recommend using 4'x8' panels of lattice work that is either wood or PVC
so<br>
that you don't have worry about grounding the material. It is
reasonably<br>
attractive and can hide some of the ugly parts of the array. The panels
can<br>
be held on with battens that screw into the structural member and allow
for<br>
panels to be removed in case the array wiring needs to be
maintained.<br><br>
Bill.<br><br>
<br>
-----Original Message-----<br>
From: re-wrenches-bounces@lists.re-wrenches.org<br>
[<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" eudora="autourl">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>]
On Behalf Of Drake<br>
Sent: Thursday, October 21, 2010 9:35 AM<br>
To: RE-wrenches<br>
Subject: [RE-wrenches] Ground Mount Screening<br><br>
Hello Wrenches,<br><br>
We are installing a ground mount system with Enphase <br>
inverters. 690.31 requires readily accessible source and output
<br>
conductors OPERATING at over 30 volts to be installed in a <br>
raceway. The Vmp of the REC230PE modules is 29.4 volts. Of
course <br>
it would go higher in cold weather. Do I have any argument that
<br>
would allow us to not install the DC conductors in a raceway?<br><br>
The NEC Handbook comments "Most PV modules do not have provisions
for <br>
attaching raceways. These circuits may have to be made "not readily
<br>
accessible" by use of physical barriers such as wire
screening".<br><br>
I have heard of a green screening material that has been used on the
<br>
E, W and N sides of ground mounts to render the area not readily <br>
accessible. Does anyone know what this is? What else would
work <br>
that would be more cost effective than running a chain link fence <br>
around the array?<br><br>
Thanks,<br><br>
Drake <br><br>
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<u>Please note new e-mail address and domain:<br><br>
</u>William Miller <br>
Miller Solar<br>
Voice :805-438-5600<br>
email: william@millersolar.com<br>
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