CONCRETE ENCASED DUCT BANK DETAIL INSTALL

Unless marked for a higher temperature, nonmetallic (plastic) conduit (Schedule 40 and Schedule 80) is intended for use with wires rated 75☌ or less.ĭ. All direct buried conduit shall be rigid hot dipped galvanized steel.Ĭ. Rigid metal conduit shall be used for underground installations whenever an extra high-strength installation is required such as in equipment foundations.ī. Conduit that runs under building slabs or roadways shall extend 1.5 meters beyond the building slab or edge of road.Ī. The minimum bending radius shall be 10 times the conduit diameter.į. In general, the depth of a conduit duct bank shall be established by the bending radius of the largest conduit in the duct bank. Where the conduit stubs up, the concrete envelope shall extend at least 150 mm (6 inches) above grade and shall be sloped.Į. The top of the concrete envelope shall be located a minimum of 610 mm (24 inches) below grade.

CONCRETE ENCASED DUCT BANK DETAIL INSTALL

Do not install any portion of the duct bank in the 45° cone of deflection from the low point of foundations.ĭ. In general, underground conduits and duct banks shall be installed below sewer lines and other piping.Ĭ. The location of all underground runs shall be selected with consideration for future structural installations in the area.ī. Underground Installation Requirements Underground RoutingĪ. Conduit material (RGS or PVC) for use in duct bank applications shall be selected per the requirements of this document.Duct banks shall be constructed with the use of concrete forms or by the use of precast duct banks.Conduit and/or cable for direct burial shall be selected per the requirements of this document.

Plowing of cable or conduit directly into the earth is not permitted. Direct buried cable or conduit shall be installed in prepared trenches as defined in this specification.The following underground installation types are acceptable. Underground installations of electrical conduit, cable, conductors or duct bank systems must be approved by company.