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Question:

If a single phase motor full load current is 30 Amperes, what is the dual element fuze size to be used as motor branch circuit short circuit protection?

A 50 amperes
Explaination

Refer: NEC Table 430.52
Dual element fuze size = 175% of FLC
30 x 1.75 = 53 amperes
The next Lower size = 50 Amperes