Concrete Encased Duct Bank Design

Reinforce concreteencased duct banks where they cross disturbed earth and where indicated.

Concrete encased duct bank design.

Arrange reinforcing rods and ties without forming conductive or magnetic loops around ducts or duct groups. 554 2 ft 3 20 5 yd 3. Do not use concrete blocks or other means to support and space conduits that are to receive concrete encasement. From gradeto the top of duct bank shall be a minimum of 610 mm 24 inches.

Minimum concrete coverage on right. Duct bank width. Additional circuits will be added routinely. 554 2 ft 3 20 5 yd 3.

Minimum concrete coverage on bottom. Minimum concrete coverage on left. Cables installed in concrete encased pvc duct this type of system is typically used in urban areas where. Underground concrete encased electric conduit duct banks shall consist of type db 60 polyvinyl chloride pvc conduit rated for 90 c cable and meeting nema standard tc 6 and astm f 512 for underground applications.

Volume of duct bank. Concentration of circuits via the same route are planned or expected. For concrete encased conduits use manufactured pvc spacers and mounts for support and spacing of the conduits. Load density is significant.

Concrete encasement shall extend a minimum of 76mm 3 inches from any conduit in the bank to the outside surface. Conduit stub ups shall be rigid steel. The top layer of concrete on the duct bank shall be red concrete.