Can a double-pole, single-throw switch rated for 250 volts AC be used as a disconnect for a 1.5 HP, 230-volt motor?

A double-pole, single-throw switch rated for 250 volts AC can indeed be used as a disconnect for a 1.5 HP, 230-volt motor. This is because the voltage rating of the switch exceeds the voltage of the motor, ensuring safety and compliance with electrical standards. Additionally, the use of a double-pole switch allows for both the line and neutral or both phases of the power supply to be disconnected simultaneously, which is critical for safely isolating the motor during maintenance or repair.

When assessing the suitability of a switch for a specific application, it's important to consider both the voltage and the current ratings. In the context of a 1.5 HP motor, this typically draws around 7.5 to 9 amps at 230 volts, depending on the efficiency and power factor. A switch rated for 250 volts should safely handle this current load as well, ensuring reliable operation without risk of overheating or failure.

Moreover, such a setup complies with the National Electrical Code (NEC) requirements for motor disconnects, which mandate that disconnecting means must be provided for motors to ensure safe practices. Consequently, a double-pole, single-throw switch of the specified rating is an appropriate choice to serve as a