Ray,
Thanks for the input. We always design the ballasted systems with a structural engineer performing wind and roof loading calcs. We were asked this question by an engineer that is not familiar with the laws/codes in the U.S. and to my knowledge it has never come up before. Thanks, Jason Szrom Engineer Solar Energy Systems, LLC 718-389-1545 x13 From: [email protected] [mailto:[email protected]] On Behalf Of R Ray Walters Sent: Monday, October 26, 2009 6:35 PM To: RE-wrenches Subject: Re: [RE-wrenches] NEC 110.13 - Mounting of Combiner If the ballasted system is properly designed to withstand the wind loading (90 mph to 150 mph), I would say that that most definitely qualifies as "firmly secured". Is someone actually giving you trouble on this issue, or are you just thinking ahead? R. Walters [email protected] Solar Engineer On Oct 26, 2009, at 1:51 PM, Jason Szrom wrote: Hello Wrenches... In typical ballasted systems, the combiner box is mounted on unistrut fastened to roof stand-offs which are not fastened to the roof. I was wondering what your opinion would be about this in reference to the following NEC section: 110.13 Mounting and Cooling of Equipment (A) Mounting. Electrical equipment shall be firmly secured to the surface on which it is mounted. Has anyone ever had a problem with this during an inspection? Thanks, Jason Szrom Engineer Solar Energy Systems, LLC 1205 Manhattan Ave Suite 1210 Brooklyn, NY 11222 718-389-1545 x13 www.solarEsystems.com <http://www.solarEsystems.com/> _______________________________________________ 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 <http://www.members.re-wrenches.org/>
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