Which of the following is a requirement for a motor disconnect?

A motor disconnect must be capable of disconnecting the power to both the motor and its controller. This requirement ensures that when maintenance or repairs are being conducted, the entire circuit is de-energized, providing safety for workers. Disconnecting only the motor or just the controller could create a hazardous situation where the motor could still be powered, leading to accidental start-up during servicing.

The design and safety standards in electrical systems prioritize worker safety, which is why disconnects must be able to isolate all components of the motor circuit. This functionality is crucial for compliance with electrical codes and practices. Therefore, having the ability to disconnect the controller as part of the process fulfills a significant aspect of proper motor control and safety protocol.