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<div class="moz-cite-prefix">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<br>
<br>
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<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 2/27/2013 4:23 PM, August Goers wrote:<br>
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<p class="MsoNormal"><span style="color:#1f497d">Jeremy, </span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="color:#1f497d">Good point.
Even under the 2008 NEC 690.64(B)(2) you can install up to a
40 Amp breaker on the load side as long as it is on the
opposite side of the input feed per 690.64(B)(7). Garrison,
do you need a 60 A breaker?</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="color:#1f497d">I haven't used
this product myself, but if the continuous output power is
indeed 4500 W then you'd be fine with a 25 or 30 A breaker.</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="color:#1f497d">Best,</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </span></p>
<p class="MsoNormal"><span style="color:#1f497d">August</span></p>
<p class="MsoNormal"><span style="color:#1f497d"> </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 moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>
[mailto:<a moz-do-not-send="true"
href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>]
<b>On Behalf Of </b>All Solar, Inc.<br>
<b>Sent:</b> Wednesday, February 27, 2013 1:50 PM<br>
<b>To:</b> RE-wrenches<br>
<b>Subject:</b> Re: [RE-wrenches] Conductor Sizing for
Supply Side Connection</span></p>
</div>
</div>
<p class="MsoNormal"> </p>
<div>
<p class="MsoNormal">
<span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">There
is an exception in NEC2011 regarding the point of
connection. This may not apply, but you could avoid the
supply side. 4500W / 240V = 18.75 x 1.25 = 23.4A, well
under the 120% rule. reference 705.12(D)(2)</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""> </span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Jeremy</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">All
Solar</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""></span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">CO,USA</span><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""></span></p>
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<p class="MsoNormal"><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">-----
Original Message ----- </span></p>
</div>
<div>
<p class="MsoNormal" style="background:#e4e4e4"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">From:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:garrison@solarserviceinc.com"
title="garrison@solarserviceinc.com">Garrison Riegel</a>
</span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">To:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
<a moz-do-not-send="true"
href="mailto:re-wrenches@lists.re-wrenches.org"
title="re-wrenches@lists.re-wrenches.org">'RE-wrenches'</a>
</span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Sent:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
Wednesday, February 27, 2013 2:15 PM</span></p>
</div>
<div>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">Subject:</span></b><span
style="font-size:10.0pt;font-family:"Arial","sans-serif"">
[RE-wrenches] Conductor Sizing for Supply Side
Connection</span></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif""> </span></p>
</div>
<p class="MsoNormal">Wrenches,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">On an upcoming job we have a Xantrex
XW4548 interconnecting with a 200A service, and I’d very
much appreciate some advice if y’all are willing. </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Since the inverter output OCPD is
required to be 60A we are looking at a supply side
connection, and I have two questions:</p>
<p class="MsoNormal"> </p>
<p class="MsoListParagraph" style="">
1.<span style="font-size:7.0pt;font-family:"Times New
Roman","serif""> </span>Before the
point of interconnection the inverter output circuit will
first pass through the XW Power Distribution Panel and
inverter bypass, which is essentially a 60A breaker. The
service disconnect for the supply side connection will also
be fused at 60A. Does the 120% rule apply to the conductor
between these two OCPDs? Or since this is a supply side
connection in accordance with 690.64(A), 690.64(B)(2) will
not apply? [this AHJ is on the 2008 NEC]</p>
<p class="MsoListParagraph"> </p>
<p class="MsoListParagraph" style="">2.<span
style="font-size:7.0pt;font-family:"Times New
Roman","serif""> </span>Can anyone
recommend a reliable insulation piercing tap connector? Or
would you recommend something else entirely for a
residential supply side connection?</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Thanks in advance,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal">Garrison</p>
<p class="MsoNormal">847-677-0950</p>
<p class="MsoNormal">Solar Service Inc.</p>
<p class="MsoNormal">
</p>
<p class="MsoNormal"> </p>
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align="center"><span
style="font-size:12.0pt;font-family:"Times New
Roman","serif"">
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