<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>I'm thinking 250.161(A)2 might apply.<br></div><div><br></div><div><br>Dan Brown<br>President<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br>www.Foxfire-Energy.com<br>NABCEP #092907-44<br><br></div>
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-------- Original Message --------<br>
Subject: Re: [RE-wrenches] Using Metal Roof as conductor<br>
From: Chris Anderson <CAnderson@borregosolar.com><br>
Date: Thu, April 01, 2010 12:59 pm<br>
To: RE-wrenches <re-wrenches@lists.re-wrenches.org><br>
<br>
NICE ONE :)<br>
<br>
-Chris Anderson<br>
Chief Technology Officer<br>
Resources Group <br>
C: 603-732-2411<br>
Borrego Solar Systems<br>
<br>
-----Original Message-----<br>
From: re-wrenches-bounces@lists.re-wrenches.org [<a href="#Compose">mailto:re-wrenches-bounces<b></b>@lists.re-wrenches.org</a>] On Behalf Of Jason Szumlanski<br>
Sent: Thursday, April 01, 2010 12:53 PM<br>
To: re-wrenches@lists.re-wrenches.org<br>
Subject: [RE-wrenches] Using Metal Roof as conductor<br>
<br>
I am installing a PV array at about 400Vdc on a metal roof. The inverter<br>
is located a very long way from the array. I am contemplating just<br>
running a positive conductor for most of the run. I was thinking about<br>
connecting the negative PV conductor to a lug solidly bonded to the<br>
metal roof material. Then at the bottom of the roof, near the eave, I<br>
would attach another lug and continue with a negative PV conductor. At<br>
junctions of the roof material, I would drive a self-tapping stainless<br>
steel screw for continuity (with sealant, of course). This would save<br>
lots of copper. And since the negative conductor is bonded to the module<br>
frame by way of the metal roof, the negative PV conductor would also<br>
serve as the ground wire.<br>
<br>
What do you think? Would this pass inspection? What NEC sections would<br>
apply?<br>
<br>
Thank you for your time,<br>
<br>
Solar Guru<br>
<br>
P.S. April Fools<br>
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