Electrical · E-9K6RM

Typical Concrete Pullbox Detail

Materials

Connections

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An underground precast concrete pullbox rests on a six-inch thick gravel base for drainage. The body includes three-inch knockouts for conduit entry and exit, sized appropriately for the number and size of incoming and outgoing lines. All conduits inside the pullbox are sealed with expanding foam duct sealant to prevent water infiltration into the conduit system. Conductors and cables are grouped and wire-tied every six inches per conduit fill, and all splices are sealed with an insulating and encapsulating resin pack such as Scotchcast 4. A traffic-rated concrete cover features galvanized steel lifting eyes, brass swing bolts in diagonally opposite corners for T-lids, and a specific label such as electric, lighting, or security.

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