Which device could be used as a disconnecting means for a 5 horsepower, 240-volt, single-phase motor?

To determine the appropriateness of a device as a disconnecting means for a 5 horsepower, 240-volt, single-phase motor, it is essential to consider the specific requirements outlined in the National Electrical Code (NEC) as well as general safety practices in electrical installations.

A disconnecting means must be capable of safely isolating the motor from the power source and should be suited for the voltage and horsepower ratings involved. For a 5-horsepower motor at 240 volts, the disconnecting means needs to reliably interrupt the load without posing any safety risk, and it should be able to handle the current generated by the motor.

Options that do not meet these criteria, whether due to inadequate current rating or failure to comply with NEC installation standards, would not be considered viable choices. If neither option presented in the question provides the necessary features such as appropriate sizing, ratings, or operational safety mechanisms required for a 5 HP motor, then indicating that neither option can serve as a suitable disconnecting means is justified.

This analysis emphasizes the importance of adhering to safety codes and ensuring that all installed electrical equipment can handle the operational demands of the motor while guaranteeing safe maintenance practices.