Electrician Red Seal · Question
What is the maximum percentage of a time-delay fuse you can use for motor branch-circuit, short-circuit, and ground-fault protection for a standard squirrel-cage induction motor?
CEC Rule 28-200 and Table 29 allow for a time-delay fuse to be sized up to 175% of the motor's full load current (FLA). This allows the fuse to withstand the mo
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Question: What is the maximum percentage of a time-delay fuse you can use for motor branch-circuit, short-circuit, and ground-fault protection for a standard squirrel-cage induction motor?
Answer options:
- 125% of FLA ✅ 175% of FLA
- 250% of FLA
- 300% of FLA
Correct answer: 175% of FLA
Explanation: CEC Rule 28-200 and Table 29 allow for a time-delay fuse to be sized up to 175% of the motor's full load current (FLA). This allows the fuse to withstand the motor's starting inrush current without tripping nuisancefully, while still providing short-circuit protection.
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