When locating power and telecom in the same duct bank, maintain a 6 inch separation between the surfaces of each duct. Minimum size is 2 for lateral feeder, 2/0 for lateral main feeder and 4/0 for main feeder. Prevent debris from entering conduit at all times. Terminate conduits in underground cable vaults (UCV) described in Special Specification, Underground Cable Vault when shown on the plans. Large concrete electrical vaults will be installed at approximately 500 foot intervals along the ductbank, the largest vaults measure 9’x9’x17’ outside dimensions. Provide bare copper ground conductor in the duct bank encasement and ground the conductor in all vaults. Construct, prepare, replace, and install conduit and conduit fittings of various sizes, as shown on the plans, in a duct bank encased in concrete. The new ductbank will connect the existing Sherwood, Alderman and Cavalier substations through a combination of two, four and six way underground ductbanks consisting of 8” PVC conduits encased in concrete. In general, the electrical and communication underground duct bank system is composed of concrete encased conduit terminating at electrical and communication manholes. The rebars shall be epoxied into the holes and extend at least 3 feet 6 inches into the duct bank encasement. Holes shall be drilled into the MHs to a depth of half that of the wall thickness. ![]() 2.2.4 Where duct banks tie into MHs, install a minimum of four 5 rebars to prevent shearing. Install 4/o bare copper ground cable the length of the duct bank to be used to connect the manholes to grounding system. Furnish and install a Danger High Voltage sign at each manhole, cable chamber, junction box, pull box, and vault. The project will install 2.75 miles of 35kV electrical ductbank to provide a dedicated underground power feed to the University of Virginia. concrete below, on the sides, and above the bank of conduits. Install a metal lined, plastic, 6' wide warning tape 18' above all raceways and duct banks.
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