• We will be performing upgrades on the forums and server over the weekend. The forums may be unavailable multiple times for up to an hour each. Thank you for your patience and understanding as we work to make the forums even better.

Duct bank separation

P

Plastichucker

New User
Location
SLC
Occupation
Electrician
I am trying to figure out the amount of separation needed for (2) 4" rigid conduits that will be in the same trench encased with concrete. I am unsure if it is 2 inches or the full 12 inches or something in between. Thanks for the help in advance.
 
ron

ron

Senior Member
Location
New York, 40.7514,-73.9925
The spacing depends on how you figured out the ampacity of the conductors.

If this is low voltage (<600V), and you used the prescriptive tables in Appendix B, then likely 7.5" center to center per the detail. If you did Neher McGrath calculations, then you need to refer to the calculation data. 1712003799624.png
 
You must log in or register to reply here.
Top