Wye Service

Three-Phase Transformers Picture A three-phase wye service hookup can provide three-phase service voltages of either 208 or 480 volts and single-phase voltages of 120, 240 or 277 volts, respectively. In general, a wye connection on the secondary side is used to connect to three-phase wye distribution lines for simplicity.

A three-phase wye electrical service is generally used to supply loads requiring both single-phase and three-phase power. Such a configuration is generally found in heavy commercial areas, industrial areas and in some specialized residential situations.