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<div class="moz-cite-prefix"><font face="Arial">Hi John,<br>
<br>
You have brought up several points.<br>
<br>
1. practical answer<br>
The NEC says that a GEC can be solid aluminum. PV mounting rails
are typically aluminum. It is easy to calculate the ampacity of
a solid aluminum piece from its cross-section.<br>
Even the lightest rails on the market have an ampacity that is
an order of magnitude greater than the copper wires required by
code for GECs.<br>
The 2011 NEC, section 250.64(C)(3) says that "Bolted, riveted or
welded connections of structural metal frames ... of structures"
are permitted splices for the GEC.<br>
The WEEB is a tested and characterized device and therefore
preferable to one that, while allowed by code, has not been
characterized at all.<br>
<br>
2. listing<br>
</font>There <font face="Arial">is no standard to list equipment
for use as a GEC or an EGC. The lack of a standard does not mean
equipment is not suitable, it just means we need to use good
engineering judgement until the codes catch up.<br>
Does new equipment meet the intent of the existing code? Are
there any valid engineering reasons not to use new equipment? I
think those are the questions we should focus on.<br>
Note that the WE</font><span
style="font-size:9.0pt;mso-bidi-font-size:8.0pt;font-family:Arial;
mso-bidi-font-family:"Times New Roman";color:black">EB
was introduced almost 7 years ago and these code issues still
have not been resolved to everyone's satisfaction.<br>
<br>
3. connecting to a copper wire<br>
Jason Szumlanski discussed this already, but I will reiterate.
When you connect a GEC to a string inverter it is done in a
reversible manner, typical with a screw connection. When you
connect to a PV system, consisting of multiple distributed
inverters, you can do so with a reversible connection, typically
a listed lug, anywhere on the PV system.<br>
<br>
Best Regards,<br>
Brian Wiley<br style="mso-special-character:line-break">
<!--[endif]--><o:p></o:p></span>
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On 1/17/2013 10:58 AM, John Berdner wrote:<br>
</div>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Jay:<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">You
raise an interesting question.<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">I
believe the structure would have to be evaluated and
Listed for equipment grounding (UL is working on a new
Standard for this now) AND for use as a GEC (which I don’t
think is possible). <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Even
if the WEEB was approved for use as a GEC (I still do not
feel this is the case) the rail then needs to be
contiguous or irreversibly spliced to the copper GEC.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">I
am not aware of any Listed hardware that facilitates this.
<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Anyone
know of any ?<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">We
also have a dissimilar metals problem irreversibly
crimping or exothermic welding (the Code requirement)
copper to aluminum.<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>
<div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Best
Regards,<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">John
Berdner<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">General
Manager, North America<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"><br>
<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">Solaredge
Technologies, Inc.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">3347
Gateway Boulevard, Fremont CA 94538 USA </span><b><i><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#C00000">(*Please
note of our new address.)</span></i></b><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><br>
T: 510.498.3201 ext 747<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">M:
530.277.4894 <o:p></o:p></span></p>
</div>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<div>
<div style="border:none;border-top:solid #B5C4DF
1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">
<a class="moz-txt-link-abbreviated" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[<a class="moz-txt-link-freetext" href="mailto:re-wrenches-bounces@lists.re-wrenches.org">mailto:re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On
Behalf Of </b>jay peltz<br>
<b>Sent:</b> Wednesday, January 16, 2013 8:52 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] GEC for
Micro-Inverters and ACPV Modules<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">Dear John and Brian<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks for a great discussion. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">My question is:<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">If you used a WEEB to connect the
inverter to the rail, is the rack rail listed as a GEC?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Or does it have to be listed as a GEC?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Jay<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Peltz power<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal"><br>
<br>
Sent from my iPad<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><br>
On Jan 16, 2013, at 12:09 PM, Brian Wiley <<a
moz-do-not-send="true"
href="mailto:btwinfinity@gmail.com">btwinfinity@gmail.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><span
style="font-family:"Arial","sans-serif"">Hi John,<br>
<br>
I don't feel that you are argumentative. I am glad
for this forum and people to put forth honest
opinions.<br>
<br>
I think you just may not be aware of how the WEEB
actually works. It is a type of rivet, not just a
pronged thing that makes connection as part of a
bolted connection.<br>
<br>
It does use a bolt to engage the part, but the teeth
on the WEEB are specially shaped. When the bolt is
torqued, the teeth deform, similarly to a rivet.<br>
The metal that it is connecting to mushrooms up
around the tooth and the tooth pinches in around the
metal.<br>
This deforming action is what forms an exceptional
electrical connection and also forms an air-tight
seal between the part and embedded metal to resist
corrosion.<br>
<br>
If you remove the bolt, the WEEB will still be
connected to the metal. You must forcibly remove the
WEEB from the metal.<br>
<br>
Hope that clears things up for you.</span><o:p></o:p></p>
<div>
<p><span
style="font-size:9.0pt;font-family:"Arial","sans-serif"">Best
Regards,<br>
Brian Wiley</span><o:p></o:p></p>
<p><span
style="font-size:9.0pt;font-family:"Arial","sans-serif""><br>
<br>
</span><o:p></o:p></p>
</div>
</div>
</div>
</blockquote>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</blockquote>
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