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Question:

If a 30 amperes snap switch is used as disconnecting means of a 3-horse power motor, what shall be the maximum full load current of the motor?

A 24 amperes
Explaination

Refer: NEC 430.109(C) (2)
If a snap switch is used to disconnect a motor must be derated to 80%
So maximum full load current of motor = 30 x 0.8 = 24 amperes