STRUCTURAL OPTION
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Electrical Systems:
Electrical service to the building consists of 4,000 amp service at 480/277V, 3-phase and 4 wires at the main distribution panel. Directly off this panel are exterior lighting, mechanical units, emergency lighting, and the elevators.
In the event of an emergency, there is a 350 kW emergency standby generator, located on the first floor, which provides power to the necessary life safety equipment, including emergency lighting, the fire pump, and elevators. Automatic transfer switches are used to run these systems off the generator when necessary. 45 KVA and 15 KVA step-down transformers provide operational receptacles during both normal use and emergency situations.
A 2,000 KVA step-down transformer converts the primary voltage of 480/277V to 208/120V. There are two additional sub-distribution panels: one serving the guest floors, and the other serving the mechanical equipment on the roof. One sub-distribution panel has a 5,000 amp bus, serving a 2,000 amp bus duct to the guest floors, which serves two panel boards per floor at 400 amps each: one for lighting, and another for power, and is terminated at the ninth floor. The 5,000 amp bus also distributes power to panels and mechanical units at the first floor. The other sub-distribution panel branches off of the first and has a 1,200 amp bus with main lugs only serving rooftop mechanical units.