What type of connection is characterized by a 3Ø, 4-W supply system delivering 120/208 volts?

In a three-phase, four-wire (3Ø, 4-W) supply system that delivers 120/208 volts, the connection type is typically a Wye (or star) configuration. In this arrangement, one point (the neutral) is common to all three phases. The phase-to-neutral voltage in a Wye system is the lower voltage of 120 volts, while the phase-to-phase voltage reaches 208 volts, which is the result of the equation for three-phase systems where the line voltage is √3 times the phase voltage.

The Wye configuration allows for the use of both three-phase and single-phase loads. It can efficiently provide a neutral point for devices that require a lower voltage, such as lighting and small appliances, making it a versatile choice in commercial and residential applications.