A 200-hp, three-phase, 460-V induction motor has a design life of 25 years at 110C rise in

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A 200-hp, three-phase, 460-V induction motor has a design life of 25 years at 110°C rise in conductor temperature above the ambient air. If it is continuously operated under unbalanced line voltages of 430, 450, and 480 V, determine: 

(1) The percentage of voltage unbalance, 

(2) The additional temperature rise when operating at rated load, 

(3) The expected life at rated load, and 

(4) The required horsepower derating for the motor to last the design life of 25 years.

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