In a three-phase system, the three wires carry the power with a neutral used for grounding.

In a three-phase system, the three wires carry the power with a neutral used for grounding.

• A. Two wires
• B. Three wires with a neutral
• C. Four wires with a neutral
• D. Three wires without a neutral

Answer: (B)

In a three-phase system, there are three hot conductors that carry the three phase voltages. When a neutral is included, it provides a return path for unbalanced loads and a grounding reference by bonding to earth at the service point. This configuration effectively has three wires carrying power plus a neutral conductor, which is why the description fits “three wires with a neutral.” The other options don’t match this setup: there isn’t just two wires for three-phase, and a four-wire system would imply the neutral alone isn’t the point of grounding or that there are four conductors carrying power, while a three-wire system without a neutral contradicts the stated grounding role of the neutral.

In a three-phase system, there are three hot conductors that carry the three phase voltages. When a neutral is included, it provides a return path for unbalanced loads and a grounding reference by bonding to earth at the service point. This configuration effectively has three wires carrying power plus a neutral conductor, which is why the description fits “three wires with a neutral.” The other options don’t match this setup: there isn’t just two wires for three-phase, and a four-wire system would imply the neutral alone isn’t the point of grounding or that there are four conductors carrying power, while a three-wire system without a neutral contradicts the stated grounding role of the neutral.