Electrician Red Seal · Question
An electrician is commissioning a new 7.5 kW (10 hp), 460 V, three-phase induction motor with a service factor of 1.15. What is the maximum continuous mechanical output power this motor can deliver without exceeding its insulation temperature rise rating?
The service factor (SF) indicates how much overload a motor can handle continuously without damage. The maximum continuous output is the nominal power multiplie
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Question: An electrician is commissioning a new 7.5 kW (10 hp), 460 V, three-phase induction motor with a service factor of 1.15. What is the maximum continuous mechanical output power this motor can deliver without exceeding its insulation temperature rise rating?
Answer options:
- 7.5 kW (10 hp) ✅ 8.625 kW (11.5 hp)
- 6.52 kW (8.7 hp)
- 9.375 kW (12.5 hp)
Correct answer: 8.625 kW (11.5 hp)
Explanation: The service factor (SF) indicates how much overload a motor can handle continuously without damage. The maximum continuous output is the nominal power multiplied by the service factor: 7.5 kW * 1.15 = 8.625 kW (10 hp * 1.15 = 11.5 hp).
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