All, We have been contracted to install a 10kW-ac system into a 45-year old house that has no main service breaker panel, only a 200A fused main switch (Zinsco). There are five 125 A rated sub-panels throughout the house, some of which have 50A & 60A breakers in them. I have been told that we are not limited to 40 A max. PV as per 690.64 (B) since there is no main bussbar. I have three questions: 1. Can we land 60A into one of these existing sub-panels 2. If not, how would you recommend "tapping" in the old 200 A fused main switch wires? 3. What do you think is the maximum amperage of PV that can be backfed in to this service?
Any other recommendations welcome. Respectfully, 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@lists.re-wrenches.org 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
