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#83635 - 02/10/03 08:55 PM Underground Duct Bank  
Al Kacoroski  Offline
Junior Member
Joined: Feb 2003
Posts: 1
Richland WA 99352
Is there any guidance for size, placement, and configuration of underground duct banks carrying multiple conduits of varying sizes, with multiple conductors in each conduit. Current is 120 V control, so heat dissipation should not be an issue. Table B.310.2 has typical configurations for one conductor per conduit, all same size, but nothing for a mixed case.


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#83636 - 02/11/03 12:22 AM Re: Underground Duct Bank  
nesparky  Offline
Member
Joined: Jun 2001
Posts: 642
omaha,ne
Just use the same rules for conduit size as you would for any other conduit run. All a duct bank is is a croup of conduits in the earth. WIre ampacity can be found in tables B.310.10 and B.310.11


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