What type of electrical system is defined as a single phase 3 wire?

A single-phase 3-wire system is specifically characterized by having one phase conductor, one neutral conductor, and a ground or bonding conductor. This configuration allows for the delivery of electrical power while providing a return path for current through the neutral wire.

In this setup, the neutral serves as a reference point, allowing for the safe and efficient distribution of power. The presence of three wires distinguishes it from a basic two-wire system, where there is typically no neutral available for the return path, affecting the system's balance and safety.

The third option correctly highlights that this system is single-phase with a neutral, making it distinct from other configurations. A dual phase system, for instance, would involve two separate phases rather than just one, which is not applicable here. Meanwhile, while a three-wire system may imply a single phase, the description provided enhances the understanding that the system's defining characteristic is the inclusion of the neutral.

Thus, this option accurately describes the nature of the electrical system in question.