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<div class="moz-cite-prefix">Garrison,<br>
I don't know why it's not listed as 60A max, but my own internal
logic would ask why it should be. The only benefit I could see for
using smaller than a 60A breaker would be to allow use of #8
conductors (allowed with a 40A or 50A breaker) instead of the #6
necessary with a 60A breaker. And of course, you could use a 40A
breaker with #6 conductors, so theoretically it would be fine. I
just fail to see any benefit to doing so.<br>
Allan<br>
<br>
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<title></title>
<font face="Times New Roman, Times, serif"><b>Allan Sindelar</b></font><br>
<small><a href="mailto:Allan@positiveenergysolar.com"><font
face="Times New Roman, Times, serif" color="#000099"><u>Allan@positiveenergysolar.com</u></font></a></small><font
face="Times New Roman, Times, serif"><br>
<span style="font-size: 10pt;">NABCEP Certified Photovoltaic
Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a href="http://www.positiveenergysolar.com/"
target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></font>
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On 2/28/2013 6:27 AM, Garrison Riegel wrote:<br>
</div>
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<p class="MsoNormal"><span style="color:#1F497D">Thanks Allen
for clarifying why a 60A is required. I was wondering. The
spec does list a surge current of 9000W so I thought that
may be the rationale, but even that would only require a
50A, and since this surge occurs during ‘stand-alone mode’
it didn’t seem to apply to the OCPD at the main panel. Your
explanation makes more sense, but I wonder why then they
don’t list the AC input breaker size as 60A <i>max</i>. If
you have few backup loads, and are not on the 2011 NEC, a
40A could theoretically be fine?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks all for
your thoughts, much appreciated.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Garrison<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">
<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>Allan Sindelar<br>
<b>Sent:</b> Wednesday, February 27, 2013 6:08 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Conductor Sizing for
Supply Side Connection<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">August,<br>
The 60A breaker is intended to allow grid power to pass
through to the loads in excess of the inverter's stand-alone
output. The point of 705.12 (moved in the 2011 NEC from
690.64 (B)(2)) is to differentiate between load pass-through
current and sell current. The amount of current fed into the
grid is (4500/230 =) 19.56A, while the amount that can be
taken from the grid and passed through to the load is much
greater. If you were limited to a 40A breaker in order to
maintain 120% of a 200A main bus, you'd be prone to nuisance
trips under large cumulative loads.<br>
<br>
Allan<o:p></o:p></p>
<div>
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a moz-do-not-send="true"
href="mailto:Allan@positiveenergysolar.com"><span
style="color:#000099">Allan@positiveenergysolar.com</span></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified
Photovoltaic Installer<br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b><br>
3209 Richards Lane (note new address)<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112</b><br>
<a moz-do-not-send="true"
href="http://www.positiveenergysolar.com/"
target="_blank">www.positiveenergysolar.com</a></span>
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<pre><o:p> </o:p></pre>
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