What configuration is used when the secondary voltage is 120/208/240?

The configuration used when the secondary voltage is 120/208/240 is primarily a Delta configuration, particularly in three-phase systems. This arrangement is common in commercial and industrial applications. The Delta configuration allows for three-phase power distribution and can provide different voltage levels, including 120 volts between phase conductors to neutral and 208 volts between phase conductors.

The term "Wild Leg" or "High Leg" is specifically associated with Delta configurations when one of the phases is connected to a higher voltage source, resulting in an unbalanced system. In a traditional Delta system where there is a high leg, two phase conductors will provide 240 volts (line to line), while the third leg can provide 120 volts (line to neutral). This configuration benefits certain applications by allowing dual voltage outputs while maintaining the necessary phase relationships.

Other options do not accurately describe this configuration. For instance, Wye is a common configuration but is not specifically linked with the 240-volt output. Ring, Neutral, Star, and Low Leg do not apply correctly in this context of standard voltage outputs found in typical Delta configurations, particularly those showing 120/208/240 volts.