What connection type is a 3Ø, 3-W supply system delivering 240 volts?

In a 3-phase, 3-wire system delivering 240 volts, the connection type is most accurately described as a delta connection. In a delta configuration, three phases are connected to form a closed loop, resembling the shape of a triangle. Each phase is connected to a load and the voltage across each phase can be measured at 240 volts.

The significance of a delta connection lies in its ability to provide a higher voltage across the load compared to a wye configuration, where the phase voltage is typically lower. In applications where 240 volts is required as line-to-line voltage, the delta connection effectively meets this need.

While a wye connection is also a common method for distributing electrical power in a three-phase system, it typically provides a lower phase voltage and is not suited to deliver 240 volts directly in a 3-phase, 3-wire system without additional transformation. The series and individual connection types do not apply to a standard three-phase supply configuration, further solidifying the delta connection as the correct choice for this scenario.