Concrete Encased Duct Bank Design

Arrange reinforcing rods and ties without forming conductive or magnetic loops around ducts or duct groups.

Concrete encased duct bank design.

554 2 ft 3 20 5 yd 3. Minimum concrete coverage on right. From gradeto the top of duct bank shall be a minimum of 610 mm 24 inches. 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.

Boxes and not concrete manholes. Reinforce concreteencased duct banks where they cross disturbed earth and where indicated. Concrete encasement shall extend a minimum of 76mm 3 inches from any conduit in the bank to the outside surface. Duct bank width.

Cables installed in concrete encased pvc duct this type of system is typically used in urban areas where. Additional circuits will be added routinely. Load density is significant. Volume of duct bank.

Minimum concrete coverage on bottom. Do not use concrete blocks or other means to support and space conduits that are to receive concrete encasement. For concrete encased conduits use manufactured pvc spacers and mounts for support and spacing of the conduits. 554 2 ft 3 20 5 yd 3.

A metallic backed marking tape shall be installed 12 above all underground conduits and duct banks. Minimum concrete coverage on left. The top layer of concrete on the duct bank shall be red concrete.