Which three-phase connection provides a neutral for single-phase loads?

Which three-phase connection provides a neutral for single-phase loads?

• A. Delta
• B. Three-wire Delta
• C. Open delta
• D. Wye

Answer: (D)

A Wye connection provides a neutral because one end of each of the three windings is tied together at a common point, creating a neutral conductor. That neutral serves as a return path for single-phase loads connected between any one phase and neutral. In delta arrangements, the windings form a closed loop and there isn't a separate neutral conductor, so you don’t have a usable line-to-neutral supply. With a Wye system, the line-to-neutral voltage is the line-to-line voltage divided by √3, which is why standard single-phase voltages like 120V or 277V (depending on system voltage) are available from a three-phase setup.

A Wye connection provides a neutral because one end of each of the three windings is tied together at a common point, creating a neutral conductor. That neutral serves as a return path for single-phase loads connected between any one phase and neutral. In delta arrangements, the windings form a closed loop and there isn't a separate neutral conductor, so you don’t have a usable line-to-neutral supply. With a Wye system, the line-to-neutral voltage is the line-to-line voltage divided by √3, which is why standard single-phase voltages like 120V or 277V (depending on system voltage) are available from a three-phase setup.