To change rotation on a three-phase motor, which wiring change is required?

To change rotation on a three-phase motor, which wiring change is required?

• A. Change position of any two wires
• B. Switch the live and neutral conductors
• C. Reverse the rotation by adjusting the voltage
• D. Rewire the stator coils entirely

Answer: (A)

Rotation direction in a three‑phase motor is set by the order of the three supply voltages. If you swap any two of the supply leads, the phase sequence changes (the order of the voltages is reversed), which flips the rotating magnetic field and makes the rotor spin in the opposite direction. This is a quick wiring change and does not alter voltage levels or require rewiring the stator coils. Switching live and neutral isn’t a relevant method in a three-phase setup, and rewiring the stator coils entirely isn’t needed.

Rotation direction in a three‑phase motor is set by the order of the three supply voltages. If you swap any two of the supply leads, the phase sequence changes (the order of the voltages is reversed), which flips the rotating magnetic field and makes the rotor spin in the opposite direction. This is a quick wiring change and does not alter voltage levels or require rewiring the stator coils. Switching live and neutral isn’t a relevant method in a three-phase setup, and rewiring the stator coils entirely isn’t needed.