What precaution should be taken before servicing a single-phase motor?

Before servicing a single-phase motor, it is crucial to disconnect power to the motor. This step is essential for ensuring the safety of the technician performing the service. When power is disconnected, the risk of electric shock or accidental motor start-up is significantly reduced, allowing for safe inspection and maintenance of the motor components.

While checking motor bearings, testing motor insulation, and cleaning motor cooling fins are important maintenance tasks, they should only be performed after ensuring that the motor is safe to work on. Disconnecting the power is the foundational precaution that must always be taken to prevent injury and ensure a safe working environment. Thus, disconnecting power is the most critical first step before any other maintenance can be effectively and safely carried out.