Elevator Mechanic Practice Exam

If a motor does not start, which component is likely to be involved?

1. Fuse box

2. Main Overload Relay

3. MOL1 T/B

4. Voltage regulator

The correct answer is: MOL1 T/B

The most likely component involved when a motor does not start is the main overload relay. This device is crucial in protecting the motor from damage due to overcurrent conditions. If the relay has tripped, it will interrupt the power supply to the motor, preventing it from starting. While the fuse box is important for protecting the circuit from overloads and short circuits, a blown fuse would typically prevent any power from reaching the motor. The MOL1 terminal block, while it may play a role in the wiring or distribution of power, does not directly affect the starting mechanism of the motor. The voltage regulator, primarily used for maintaining a constant voltage supply, is less likely to be the cause if the issue is simply that the motor fails to start, as it would affect the overall voltage but not prevent starting by itself. Thus, the main overload relay is central in this scenario, as its primary role is to safeguard the motor against conditions that could hinder its operation.