Wayne,
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.
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.
I think you'll need to get the actual busbar rating from the
manufacturer.
Allan
Allan Sindelar
[email protected]
NABCEP Certified PV
Installation Professional
NABCEP Certified Technical Sales Professional
New Mexico EE98J Journeyman Electrician
Founder (Retired), Positive Energy,
Inc.
505 780-2738 cell
On 11/30/2014 4:45 PM, Wayne Irwin wrote:
Hello Wrenches,
Hope you all had a nice Thanksgiving.
I have an AHJ asking for the service panel buss rating and the
service panel buss protection rating.
Am I correct to assume that the rating is the service panels
designated rating x 1.2% (ie 200A x 1.2 = 240)?
and that the buss protection is the combined input breakers?
200 Main breaker + 40A solar back feed = 240A?
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.
If there is any designated signage or data sheets
specific to the service panel, where might I find this?
I have looked at Schnider but have not been able to find
anything specific.
Thanks,
Wayne
Irwin,
President
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