Since Peter is talking about a subpanel, we can assume that it is not the main service for a building/structure, and would not be subject to the disconnect requirements of NEC articles 225 and 230. In general, as long as the subpanel is in the same building or structure as the main service, it is not required to have a main breaker. There are a lot of exceptions on service entrance requirements, so it's a good idea to read through the relevant sections of articles 225 and 230 to get a handle on this.
-Hans Frederickson -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dave Click Sent: Monday, April 05, 2010 6:07 AM To: [email protected] Subject: Re: [RE-wrenches] Overcurrent Protection on a Subpanel One could interpret that if you have 6 or more inverter breakers getting combined in a panel, you'd want one main breaker so that you wouldn't have to turn off all ten individually to disconnect the system. Something else to ask the AHJ. Peter Parrish wrote: > When we use a sub-panel to combine the output of two or more > inverters, we buy the sub-panel without a main breaker. A wrench who > is working with us now, recommends buying sub-panels with the main > breaker, which increases cost by about 50%. Is this a code > requirement? Does it depend on the distance between the sub- and main panels? > > - Peter > > Peter T. Parrish, Ph.D., President > California Solar Engineering, Inc. > 820 Cynthia Ave., Los Angeles, CA 90065 CA Lic. 854779, NABCEP Cert. > 031806-26 [email protected] > <mailto:[email protected]> > Ph 323-258-8883, Mobile 323-839-6108, Fax 323-258-8885 > > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: [email protected] > > Options& 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 > _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & 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 _______________________________________________ List sponsored by Home Power magazine List Address: [email protected] Options & 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
