[RE-wrenches] 310.15(A)(2) Exception

Dave Click daveclick at fsec.ucf.edu
Wed Aug 17 10:51:52 PDT 2011


As I read the rule, that 100' in the trench allows you to go 10' above 
grade on each side while just worrying about the ampacity in the 100' 
section (be sure to check that your terminals are OK). For 200' in the 
trench, you're still looking at 10' above grade on each side. The rule 
doesn't say that you can only use this exception once per circuit, so 
it's fine that you use it once at each end.


On 2011/8/17 12:22, Brian Mehalic wrote:
> Question about the 10'/10% rule - the exception states "adjacent
> portions of a circuit."  How does this apply to an underground conduit
> run, where there are two ends exposed to higher ambient temperatures
> than the length in the ground?
>
> For example, what if there is 100 feet in the trench, and 7 feet above
> grade on either side? Can the exception be applied? How about 200 feet
> in the trench and 7 feet above grade on either end?
>
> Thanks,
> Brian
>
> --
> ========================
> Brian Mehalic
> NABCEP Certified Solar PV Installer™ R031508-59
> IREC ISPQ Certified Affiliated Instructor/PV US-0132
> PV Curriculum Developer and Instructor
> Solar Energy International
> Carbondale, CO 81623
> http://www.solarenergy.org
>
>
>
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