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Standby Generator Sizing with Life-Safety, Elevator and IT Transfer Switches

A 480Y/277 V main switchboard and a standby generator feeding three transfer switches for life-safety (35 kW), elevator (28.3 kW) and IT (57 kW) loads. The 120.3 kW total divided by 0.80 gives 150.4 kW, so a 175 kW generator is selected.

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