If the output of a 3Ø generator is 208 volts line-to-line with a neutral connection, what type of system is it?

The correct answer indicates that the system is a three-phase, four-wire configuration. This is characterized by having three phase conductors and one neutral conductor.

In this specific context, a three-phase system operates with voltages measured between the three phases (line-to-line voltage) and can also have a neutral point which allows for single-phase loads to be connected safely to the system. When the output is specified as 208 volts line-to-line with the option of a neutral connection, it means that the system facilitates not just three-phase loads but also has the capacity to serve single-phase loads effectively, which is typical of a four-wire system.

This configuration is commonly used in commercial and light industrial applications where both three-phase and single-phase equipment are present. The presence of a neutral wire allows for the balancing of loads and provides a return path for unbalanced loads, enhancing the stability and safety of the electrical system.

In contrast, a three-phase, three-wire system would not include a neutral and is limited to three-phase loads only, making it unsuitable for applications needing a neutral. Other options like single-phase or a two-phase system do not apply here, given that the question specifically mentions a three-phase generator output.