Building systems
A 480Y/277V service is a three-phase, four-wire wye system with 480 volts between phases and 277 volts from any phase to neutral, common in larger commercial and industrial buildings.
The 277-volt side often powers lighting, while 480 volts runs larger motors and HVAC equipment. Small tenants may need transformers to get 120-volt power. Equipment capacity, age and available spare capacity affect leasing and expansion plans.
Source: c03.apogee.net
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