Which of the following is not a common voltage provided by a wye-configured system?

In a wye-configured system, the voltages are derived based on the configuration of the transformers and the phase-to-neutral connections. Common voltages provided by a wye system include 120 VAC, 208 VAC, and 480 VAC.

The voltage of 120 VAC typically serves as the phase-to-neutral voltage in a wye configuration, especially in residential and light commercial settings. The 208 VAC is commonly seen in three-phase wye systems that serve smaller commercial loads, where customers may connect to line-to-line measurements. The 480 VAC is also prevalent in industrial applications, where three-phase systems are used to power large motors and equipment efficiently.

However, while 240 VAC can be provided in certain special configurations, it is not a standard voltage found in most wye-configured systems. Instead, the 240 VAC is more typical in delta configurations or when derived from a split-phase system, such as in residential settings. Therefore, identifying 240 VAC as not being common in a wye-configured system clarifies the choice that differentiates typical voltage outputs from special or less conventional configurations.