Hi Wrenches - I've noticed discrepancies in load rating methods for various modules and wondered if there was any insight from the installer community. REC claims 113 PSF, Sharp claims only 50PSF. Solarworld notes 50PSF load rating, but 113 PSF snow load rating. I'm assuming the difference is that snow load rating is greater because its assumed to be widely distributed, but yet its still per square foot so perhaps not. Is a Sharp module such as the 240NUQ-240F2 as durable as REC, Evergreen, Solarworld etc and they are just more honest in their portrayal of load rating.
Thanks for your help, Rich From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of Gary Willett Sent: Monday, October 03, 2011 4:33 PM To: re-wrenches@lists.re-wrenches.org Subject: Re: [RE-wrenches] interrupting current calculations used to determine the interrupting of the AC equipment. James: I believe your PE is referring to the short circuit current calculations of 110.10, and the 110.24 marking requirements for AFC (Available Fault Current). The utility company should be able to give you the AFC at the secondary of their transformer, or better yet - at the service equipment. The short circuit current rating of the utilization equipment, and the AIC (Available Interrupting Current) rating of the OCPD in the utilization equipment, must exceed the AFC. Regards, Gary Willett, PE From: re-wrenches-boun...@lists.re-wrenches.org [mailto:re-wrenches-boun...@lists.re-wrenches.org] On Behalf Of James Rudolph Sent: Monday, October 03, 2011 1:54 PM To: RE-wrenches Subject: [RE-wrenches] interrupting current calculations used to determine the interrupting of the AC equipment. Dearest Wenches, I received an e-mail from PE reviewing one of our projects to build, and this is what they wrote- No interrupting current calculations were included. It is suggested the utility company be consulted for available at the service entrance and these values be used to determine the interrupting of the AC equipment. Does any one out there have experience dealing with this issue, or have the ability to shed some light on this subject. Many thanks in advance, -- James B Rudolph NABCEP Certified PV Installer _______________________________________________ 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
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