Electrical · E-D4NVC

Underground Electrical Trench and Duct Bank Detail

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An underground electrical duct bank is installed below a minimum thirty-inch depth of cover unless otherwise noted. Signal and power conduits under six hundred volts are supported on plastic ladders within a sand backfill compacted to ninety percent density. A two-sack concrete slurry cap with a minimum thickness of three inches is placed over the sand backfill, topped with warning tape and selected backfilled soil or new asphalt and concrete paving to match existing site conditions. Clearances of three inches are maintained between conduits and twelve inches between separate utility systems within the common trench.

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