In terms of secondary voltages, what configuration does 120/208 or 240/416 represent?

The configuration represented by 120/208 or 240/416 is Wye. In a Wye (or star) configuration, each phase is connected to a common neutral point, which allows for different voltage levels to be derived from the same transformer.

For a 120/208 system, the line-to-neutral voltage is 120 volts, while the line-to-line voltage is 208 volts, which is typical for a three-phase Wye system where each leg of the phase provides the same voltage with respect to the neutral. This allows for both single-phase and three-phase loads to be connected efficiently.

In a Wye configuration, the phase voltages are related to the line voltages by the square root of three. This relationship means that Wye configurations can provide both higher line voltages suitable for three-phase loads while still allowing for lower phase voltages for single-phase loads.

Moreover, Wye configurations also enable the use of a neutral conductor, making it easier to balance loads and providing safety measures in electrical distribution systems. This is particularly relevant in commercial settings where a combination of single-phase (120V) and three-phase (208V) power is often needed.