Electrical · E-YT4PY

Underground Electrical Ductbank Reinforcement Detail

Materials

Concrete Reinforced Concrete Steel Metal (misc.)

Elements

Foundations / Footings Vaults / Domes Reinforcing

About this detail

A reinforced concrete ductbank measuring thirty-two inches wide by fourteen inches high encloses three six-inch Schedule 40 PVC power conduits. The concrete mix requires a thermal resistivity of rho equal to 65, surrounded by engineered backfill with a thermal resistivity of rho equal to 90. A continuous four-zero American Wire Gauge bare copper ground runs inside the encasement and bonds to ground rods at each manhole, vault, or piece of equipment. Number 4 steel rebar runs parallel to the ducts, supplemented by number 4 steel encircling rebar spaced every four feet on center. The assembly sits beneath a driveway and within ten feet of building foundations, maintaining a minimum twenty-four-inch cover below finished grade with a detectable warning tape positioned approximately ten inches above the top of the concrete encasement.

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