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Question:

A 440 volts motor has a full load current of 34 amperes. what size disconnecting means is required?

A 40 amperes
Explaination

Refer: Section 440.12(A)(1)
The rating of disconnecting means is 115% of full load current.
34 x 1.15 = 39.1 amperes.
The nearer rating is 40 amperes.