Electrical · E-MXX9P

Typical Grounding and Bonding Detail

Materials

Concrete Reinforced Concrete Steel Stainless Steel Metal (misc.)

Elements

Foundations / Footings Insulation Entrances Connections / Plates Reinforcing

About this detail

This diagram details the electrical grounding and bonding requirements for service entrance equipment, panelboards, and dry-type transformers in compliance with NEC 250. It shows service connections linking to phase buses, neutral buses, and ground buses, with insulated neutral bars and typical ground bus bars installed in panelboards. Connections extend to structural building steel, a concrete-encased foundation rebar electrode known as a Ufer connection, a copper-clad grounding rod, and the main interior cold water service. Conduits require ground bushings bonded to the ground bus, and a continuous grounding conductor runs without splices alongside a 1 inch conduit with a 1/3/0 feeder ground conductor. A motor starter and 277/480V, 3-phase, 4-wire service connections are also integrated.

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