<div dir="ltr"><div><div>Wayne <br></div>I agree with Allen, the new service panel we use is made for Re applications and comes with a larger buss it is also labeled as such.<br></div>Jerry<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Nov 30, 2014 at 4:29 PM, Allan Sindelar <span dir="ltr"><<a href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<div>Wayne,<br>
I don't think that you are correct. The bus rating of a 200A
service panel may or may not be 200A, but it's not simply 120% of
the panel's rating.<br>
<br>
The original 120% rule was premised on the fact that in
residential applications, panelboards (and thus busbars) were
seldom if ever run at full ampacity, and thus a 20% "negative
load" of a PV system was unlikely to ever cause overloading and
overheating of the busbar. You'll note that this was originally
allowed only in residential applications; commercial buildings
were expected to likely run at or near capacity.<br>
<br>
I think you'll need to get the actual busbar rating from the
manufacturer.<br>
Allan<span class="HOEnZb"><font color="#888888"><br>
<br>
<div>
<div>
<p class="MsoNormal"><b>Allan Sindelar</b><br>
<span style="font-size:10.0pt"><a href="mailto:allan@sindelarsolar.com" target="_blank">allan@sindelarsolar.com</a></span><br>
<span style="font-size:10.0pt">NABCEP Certified PV
Installation Professional<br>
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Founder (Retired), <span>Positive Energy,
Inc.</span><br>
<b><a href="tel:505%20780-2738" value="+15057802738" target="_blank">505 780-2738</a> cell</b><br>
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<b><u></u><u></u></b></span></p>
<p class="MsoNormal"><u></u> <u></u></p>
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</div></font></span><div><div class="h5">
On 11/30/2014 4:45 PM, Wayne Irwin wrote:<br>
</div></div></div>
<blockquote type="cite"><div><div class="h5">
<div dir="ltr"><font style="font-size:12pt" color="#000000" size="3">Hello Wrenches, <br>
<br>
Hope you all had a nice Thanksgiving.<br>
<br>
I have an AHJ asking for the service panel buss rating and the
service panel buss protection rating.<br>
<br>
Am I correct to assume that the rating is the service panels
designated rating x 1.2% (ie 200A x 1.2 = 240)?<br>
and that the buss protection is the combined input breakers?
200 Main breaker + 40A solar back feed = 240A?<br>
</font><br>
<font style="font-size:12pt" color="#000000" size="3"><font style="font-size:12pt" color="#000000" size="3">Given that
there are many different size panels (150A and 200A) that
share the same bus, I have a difficult time believing this
to be true.<br>
<br>
</font>If there is any designated signage or data sheets
specific to the service panel, where might I find this?<br>
I have looked at Schnider but have not been able to find
anything specific.<br>
<br>
Thanks,<br>
</font><br>
<br>
<font style="font-size:12pt" color="#008A17" size="3">Wayne
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