Because high-bay lighting normally operates at the higher single-phase AC voltage of 277 volts, a 3-phase AC, 480-volt D-primary, 208Y/120-volt secondary power transformer is used to ____________ the required 120-volt supply for convenience (general-use) receptacles (the common duplex receptacle) located throughout the manufacturing facility.
B) separately contrive
C) separately derive
D) separately exercise
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