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
What type of 800 Amp main is it?
and, Hopefully it's not City of LA.
Max Balchowsky
Design Engineer
SEE Systems
1048 Irvine Ave Suite 217
Newport Beach, Ca. 92660
760-403-6810
Building a Better Future For The Next Generation
From: Pekka Laine
Pekka:
160A is not a standard OCPD value (NEC 2011; 240.6). I'd go with the
next smaller size, or 150A. I would size the ampacity of the feeder
conductors for 175A.
Regards,
Gary Willett
Icarus Engineering
On 6/17/13 12:33 PM, Pekka Laine wrote:
Dear Fellow Wrenches,
We have a small 50kW
Pekka,
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
Pekka,
Does the 800A main panel have a main 800A breaker? If not, then couldn't you
install a 175A breaker?
800 x 1.2 = 960A - (main breaker size) = Allowed PV breaker size.
We did a design for a project in Hawaii recently were we connected to a
208Y/120V 800A main panel with a 350A PV breaker.
The 120% rule applies to both commercial and residential from the 2008 code on.
Kirk Herander
VSE
On Jun 17, 2013, at 2:58 PM, Allan Sindelar al...@positiveenergysolar.com
wrote:
Pekka,
I believe that the 120% rule is only for residential application. Unless it's
changed (and I don't do
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