Electrical · E-S3C2Y

Pre-Cast Grade-Level Pullbox

Materials

Concrete Reinforced Concrete Steel Masonry / CMU

Elements

Vaults / Domes Site / Paving Connections / Plates Reinforcing

Connections

Base Plate / Anchorage Bolted Connection

About this detail

A pre-cast concrete pullbox is installed below finished grade with a reinforced concrete cover plate secured by hold-down bolts. The pullbox sits on a six-inch deep gravel sump and seat that extends eight inches beyond the box on all sides. Conduits enter through bell ends sealed with grout all around, and a two-inch diameter drain hole connects the interior to the gravel sump. A pre-cast concrete extension with a base is provided below the main box, and a grout joint seals the assembly all around. Installation notes specify keeping the box flush with finished concrete and two inches above finished grade in planter and lawn areas, while the included pullbox and vault schedule details specific Christy numbers, sizes, extensions, lids, and inscribed remarks for lighting, EVSE, power, and tele/data circuits.

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