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 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.
www.PhotonSolarPower.com
Cell. 760-556-8170
Toll Free 888-SUN-ACDC
CA Lic. #933648
NABCEP Certified PV Installer # 032611-174
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