Electrical · E-GM8KF

4000A Outdoor Bus Duct and Transformer Service Diagram

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An outdoor 4000A bus duct with dedicated support connects a new utility transformer to the main switchboard, which features a NEMA-1 4000A ground fault interrupting main circuit breaker at 480/277V, 3-phase, 4-wire with 65kAIC rating. The bus duct and associated outdoor service are provided and installed by the electrical contractor, with final connections to the transformer executed by the utility company. A separate fire pump section contains a NEMA-1 400A, 480/277V, 3-phase, 4-wire, 65kAIC fire pump controller alongside a 3HP 480V 3-phase jockey pump and its controller.

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