To reverse the rotation of a three-phase motor, which action should be taken?

• A. Increase supply voltage
• B. Swap any two T leads
• C. Swap all three leads
• D. Switch the motor wiring diagram

Answer: (B)

The rotation direction of a three-phase motor is determined by the order in which the three phase voltages reach their peaks. If you swap two of the supply leads, you flip that phase sequence (the order becomes the reverse), so the rotating magnetic field turns the other way and the rotor follows in the opposite direction.

Increasing the supply voltage does not change the direction; it mainly affects torque and the motor’s ability to start or run under load. Swapping all three leads is effectively just relabeling the phases and leaves the sequence the same, so it doesn’t reverse rotation. Switching the motor wiring diagram isn’t a specific, reliable method for reversing direction.