[RE-wrenches] NEC 110.13 - Mounting of Combiner

R Ray Walters ray at solarray.com
Mon Oct 26 15:35:20 PDT 2009


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
ray at solarray.com
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
>
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