[RE-wrenches] Feeding 160A 3PH to a 800A/800A Main Service

Gary Willett Gary at IcarusSolarServices.com
Mon Jun 17 10:59:03 PDT 2013


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
> _______________________________________________
> List sponsored by Home Power magazine
>
> List Address: RE-wrenches at lists.re-wrenches.org
>
> Change email address & settings:
> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org
>
> List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org
>
> List rules & etiquette:
> www.re-wrenches.org/etiquette.htm
>
> Check out participant bios:
> www.members.re-wrenches.org
>




More information about the RE-wrenches mailing list