Electrical · E-58P2H

Switchboard Grounding

Materials

Steel Metal (misc.)

Elements

Floors / Slabs Entrances Connections / Plates

Connections

Bolted Connection

About this detail

A copper ground bus mounts above the floor with compression lugs bolted to the plate, and each ground is individually tagged and identified. Conductor runs include one 3/0 copper wire in a one-inch rigid galvanized steel conduit to the cold water piping within the first five feet of the building service entrance, one number six copper wire in a three-quarter-inch rigid galvanized steel conduit to the main telephone backboard, and one 3/0 copper wire in a one-inch rigid galvanized steel conduit to the structural metal framing. Additional runs tie the ground bus to the main busbar or generator, a Ufer structure, grounding rods, and a transformer. Total resistance measured between the main service ground bus and the earth must not exceed twenty-five ohms under dry ground conditions.

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