Which of the following best describes the role of leads L1 and L3 in a motor?

The role of leads L1 and L3 in a motor is best described as phase connections. In three-phase motor systems, L1, L2, and L3 represent the three separate phases of alternating current (AC) that provide the motor with the power needed for operation. Each phase is 120 degrees out of phase with the others, allowing for a more efficient and continuous power supply to the motor. This three-phase power setup is essential for the smooth operation of induction motors, as it generates a rotating magnetic field that drives the motor's rotor.

Understanding the function of phase connections is crucial for technicians, as correct wiring and configuration of these leads directly impact the motor's performance. Misconfiguring phase connections can lead to issues such as motor overheating, reduced efficiency, or in severe cases, damage to the motor itself.