Where should you start troubleshooting when an electric motor fails to operate?

Starting troubleshooting at the power source is the most effective first step when an electric motor fails to operate. This is because the power source is fundamental to the motor's operation—if there is no electrical supply, the motor cannot function regardless of the condition of the motor itself, the circuit breaker, or any other components in the circuit.

When assessing the power source, checking for proper voltage and ensuring that the electrical supply is available and functioning is crucial. If the power source is intact, further troubleshooting can then proceed to downstream components such as circuit breakers or switches.

While it might seem logical to start at the motor, doing so without first confirming that power is reaching it can lead to unnecessary time spent on inspecting the motor itself, especially if there is a broader issue with the electrical supply. Similarly, beginning at the circuit breaker or starter switch without confirming the power source can also delay identifying the root cause of the failure. Thus, focusing on the power source first streamlines the troubleshooting process and increases efficiency in problem resolution.