book for electrical duct bank design

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nipipapa

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I was wondering if anyone out there knew anything about a book that was alittle more specific the the NEC on duct banks and underground conduit design.
I just feel the NEC is too vague when it come to duct banks/underground conduits/ampacities/everything.
anyone have any recomendations on extra literature?
thanks
 
It's vague because it is not a design guide, please read Article 90.

Southwire has a really good Power Cable Manual, however,to really understand and be able to see the impact of burial depths, conduit separations, proximity to external heat sources, varying soil types, etc. you will need to use a good engineering computer program.
 
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