For stationary motors rated at 2 HP or less and 300 volts or less, which type of disconnecting means is permitted?

• A. A general-use switch rated not less than twice the full-load current rating of the motor
• B. A listed motor disconnect
• C. A standard fusable disconnect
• D. A plug-in receptacle

Answer: (A)

The key idea here is that for small stationary motors, the disconnecting means can be a simple general-use switch, as long as its rating is enough to handle the motor’s starting surge. For motors rated at 2 HP or less and 300 volts or less, the code allows this option, provided the switch is rated not less than twice the motor’s full-load current. The inrush and starting current of a motor can be several times its running current, so giving the disconnect a margin—twice the full-load current—helps ensure it can be opened safely without overheating or failing when the motor starts or stalls.

So, a general-use switch that can carry at least 2x the motor’s FLA satisfies the requirement and is a practical, cost-effective disconnect for these small motors. Other types can be used in different scenarios, but the rating-based allowance makes the general-use switch the correct choice for this situation.