<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div>The 120% rule applies to both commercial and residential from the 2008 code on.<br><br>Kirk Herander<div>VSE</div></div><div><br>On Jun 17, 2013, at 2:58 PM, Allan Sindelar <<a href="mailto:allan@positiveenergysolar.com">allan@positiveenergysolar.com</a>> wrote:<br><br></div><blockquote type="cite"><div>
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<div class="moz-cite-prefix">Pekka,<br>
I believe that the 120% rule is only for residential application.
Unless it's changed (and I don't do commercial any more, so I may
be all wet here) you're limited to 100% on commercial
applications. The assumption is that a commercial service may
already be running at or close to full ampacity, while residential
is unlikely ever to do so.<br>
Allan<br>
<br>
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<p class="MsoNormal"><b>Allan <span class="SpellE">Sindelar</span></b><br>
<span style="font-size:10.0pt"><a href="mailto:Allan@positiveenergysolar.com"><u><span style="color:#000099">Allan@positiveenergysolar.com</span></u></a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional <br>
NABCEP Certified Technical Sales Professional<br>
New Mexico EE98J Journeyman Electrician<br>
Founder and Chief Technology Officer<br>
<b>Positive Energy, Inc.</b>, a Certified B <span class="SpellE">Corporation<sup><span style="font-size:7.5pt">TM</span></sup></span><br>
3209 Richards Lane<br>
Santa Fe, New Mexico 87507<br>
<b>505 424-1112 office 780-2738 cell</b><br>
<a href="http://www.positiveenergysolar.com/" target="_blank"><u>www.positiveenergysolar.com</u></a><o:p></o:p></span></p>
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On 6/17/2013 11:33 AM, Pekka Laine wrote:<br>
</div>
<blockquote cite="mid:907097407.16292407.1371490429394.JavaMail.root@photonsolarpower.com" type="cite">
<pre wrap="">Dear Fellow Wrenches,
We have a small 50kW 120/208V commercial job with five 9kW 3PH inverters, each outputting max. 25A. We are landing those into a dedicated load center with five 40A breakers. Doing the math, 5 x 25A x 1.25 = 156.25A, we would need a 160A breaker. This also equals to the maximum we can backfeed into a 800A/800A Main Service on the load side according to the "120%" rule.
The problem now is that we cannot locate any kind of 160A breaker or even a 160A fuse for a AC disconnect.
Has anybody ever done this without doing a "line-side tap?" It is hard to believe that there wouldn't be an existing solution to landing maximum PV into a 800A service. Are we missing something?
Any good ideas or comments would be appreciated.
Sincerely,
Pekka Laine
President
Photon Solar Power Inc.
<a class="moz-txt-link-abbreviated" href="http://www.PhotonSolarPower.com">www.PhotonSolarPower.com</a>
Cell. 760-556-8170
Toll Free 888-SUN-ACDC
CA Lic. #933648
NABCEP Certified PV Installer # 032611-174
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