If the output of a 3Ø generator is 208 volts, line-to-line, and it has a neutral connection, this is a ___ system.

• A. 3Ø, 4-W
• B. 3Ø, 3-W
• C. 1Ø, 2-W
• D. 3Ø, 2-W

Answer: (A)

In a three-phase system, a neutral conductor means a four-wire setup, typically a wye (star) connection with three phase conductors plus neutral. A line-to-line voltage of 208 V with a neutral is the common 120/208 V four-wire system: the line-to-neutral voltage would be about 120 V, allowing both 208 V three-phase loads and 120 V single-phase loads. So this is a three-phase, four-wire system (3Ø, 4-W). If there were no neutral, you’d typically have a delta, which is a three-wire, not four-wire, arrangement.