Z Zane Bailey Member Jan 28, 2013 #1 does the code specify the maximum amount of concrete encasement of duct banks? Can the details given in 310.60 be encased in an unlimited amount of concrete before derating and engineering calculations are needed?
does the code specify the maximum amount of concrete encasement of duct banks? Can the details given in 310.60 be encased in an unlimited amount of concrete before derating and engineering calculations are needed?