<html><body><span style="font-family:Verdana; color:#000000; font-size:10pt;"><div>We kicked this around in class a little.. consensus is that it depends on weather or not (or how) the grounded (Neutral) conductor is connected.. 690.41 says you gotta ground the "System" in accordance with 250.4(A)..<span> (for surges)<span id="GD__CURSOR">.. 690.43 and such is for Grounding equipment (Different Animal). </span></span> So I'm thinking no.. Check out Article 100-I, 250.20(D) and although 690.3 doesn't mention it specifically (which means it might not apply) 705.50 requires "Interconnected Power Production Sources" to be grounded in accordance w/ Article 250... Clear as Mud? Well as my Instructor likes to say (He's an Electrician at the State Mental Facility).. "I must be off".. db<br></div><div><br></div><div><br>Dan Brown<br>Foxfire Energy Corp.<br>Renewable Energy Systems<br>(802)-483-2564<br><a href="http://www.Foxfire-Energy.com">www.Foxfire-Energy.com</a><br>NABCEP #092907-44</div><div><br><br></div>
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-------- Original Message --------<br>
Subject: [RE-wrenches] Are PV Systems are considered separately derived<br>
systems?<br>
From: "Ryan J LeBlanc" <<a href="mailto:ryan@naturalenergyworks.com">ryan@naturalenergyworks.com</a>><br>
Date: Fri, March 11, 2011 3:15 pm<br>
To: <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>><br>
<br>
<br>
What's the best answer when someone asks if PV Systems are considered<br>
separately derived systems?<br>
<br>
It still seems to be up to whoever is doing the considering (AHJ), and I<br>
don't like that answer.<br>
<br>
I believe the answer is yes they are. And 690.47 tells us how to ground<br>
them. <br>
<br>
"(C) Systems with Alternating-Current and Direct-Current Grounding<br>
Requirements. Photovoltaic systems having dc circuits and ac circuits with<br>
no direct connection between the dc grounded conductor and ac grounded<br>
conductor shall have a dc grounding system. The dc grounding system shall be<br>
bonded to the ac grounding system by one of the methods in (1), (2), or<br>
(3)." <br>
<br>
Any help is appreciated<br>
<br>
~Ryan<br>
<br>
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