Electrical · E-5DRE9

System Grounding Detail

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A quarter-inch by four-inch copper ground bus is mounted within the switchboard and drilled and tapped as required. Multiple conductors route from the bus to building elements, including a three-quarter-inch conduit with one conductor for the building metal frame, a bare copper electrode encased in concrete, and a three-quarter-inch conduit with one conductor to the metal underground water pipe. Additional conduit runs extend to the telecommunication room backboards, utility company telephone and cable television backboards, and the ground ring. A permanent tag is provided to identify each conductor, and sizing tables for the grounding electrode conductor, main bonding jumper, and communications ground conductor are included per the Canadian Electrical Code.

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