The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Featured:

2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Members: Did you know?
by Admin
37 minutes 25 seconds ago
Safety at heights?
by HotLine1
Yesterday at 08:51 PM
International Wire Colour Codes
by Texas_Ranger
Yesterday at 03:29 PM
Looking for older post
by Texas_Ranger
Yesterday at 03:22 PM
Last time to chat here
by Trumpy
01/20/17 11:41 PM
New in the Gallery:
Desk-mounted "power-board"
Shout Box

Top Posters (30 Days)
Admin 36
HotLine1 20
Ruben Rocha 17
gfretwell 16
Trumpy 15
Who's Online
1 registered (Admin), 81 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#83635 - 02/10/03 04:55 PM Underground Duct Bank
Al Kacoroski Offline
Junior Member
Registered: 02/10/03
Posts: 1
Loc: 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.
Top
2017 / 2014 NEC & Related Books and Study Guides
#83636 - 02/10/03 08:22 PM Re: Underground Duct Bank
nesparky Offline
Member
Registered: 06/21/01
Posts: 650
Loc: 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
_________________________
ed
Top


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals