What is the correct method to reverse the rotation of a three-phase, 60-cycle induction motor?

Interchanging two of the power leads is the correct method to reverse the rotation of a three-phase, 60-cycle induction motor. This works because the direction of the magnetic field produced by the motor is determined by the phase sequence of the electrical supply. By swapping any two of the three power leads, you effectively change the phase sequence of the voltage supplied to the motor. Since the induction motor relies on this phase sequence to determine the direction of its magnetic field, changing the connections leads the motor to rotate in the opposite direction.

Switching any two leads to the rotor and reversing the field connections are incorrect approaches because they do not specifically address how the change in electrical connections influences the magnetic field necessary for direction reversal. Additionally, reversing the connection to the starting winding pertains to different motor types and does not apply to the method needed for reversing a three-phase motor's rotation directly. Therefore, the correct choice focuses on the direct influence of power lead arrangement, highlighting the importance of understanding phase relationships in three-phase systems.