How can the rotation on a 3-phase motor be changed?

Changing the rotation direction of a 3-phase motor can be accomplished by swapping the positions of any two of its three phase supply wires. This method works because the direction of rotation in a 3-phase motor is determined by the sequence of the phase currents. By swapping any two wires, the phase sequence is altered, which reverses the direction of the magnetic field in the motor. This switch effectively changes the way the magnetic fields interact within the motor, leading to a change in the rotational direction.

Other options involve methods that do not directly affect the rotation direction of a 3-phase motor. For instance, reversing the voltage supply is not effective in altering rotation since the motor will still operate under the same phase sequence. Adjusting the motor's capacitor typically applies to single-phase motors to help with starting torque or improving power factor, but does not change the rotation in a 3-phase system. Changing the motor's frame is unrelated to the electrical connections and won’t impact how the motor rotates.