Electrical · E-4ATHW

Electrical Service Grounding and Bonding System Diagram

Materials

Concrete Reinforced Concrete Steel

Elements

Foundations / Footings Anchors / Embeds Connections / Plates Reinforcing

Connections

Welded Connection Bolted Connection Embed Plate

About this detail

An electrical service grounding and bonding diagram shows connections from the main switchgear building ground bus to metallic cold water services, metallic fire sprinkler services, building structural steel, and a concrete foundation grounding electrode. All connections to the ground bus utilize bolt-type fasteners with Belleville washers, conduit hubs, and cable clamps. A bare full-size grounding electrode conductor is embedded at least twenty feet in the reinforced concrete foundation and exothermically welded to the foundation steel. A bonding jumper connects to the switchgear neutral bus, while an intersystem bonding termination device is installed externally at service equipment and disconnecting means per National Electrical Code 250.94. Additional jumpers are detailed around water meters and insulating joints, utilizing number six copper conductors.

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