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A three phase 30 hp 460 volt 60 hz, 1770 rpm design B induction motor with...

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Mechanical Engineering

A three phase 30 hp 460 volt 60 hz, 1770 rpm design B inductionmotor with class F insulation and service factor of 1.0 isoperating at rated shaft load in a 40 degree C environment and hasan expected 20 yr life. A maintenance check shows line to linevoltages to be 449.2 V, 431.3 V and 462.4 volts. The percentunbalanced voltage for this motor is:

the expected temperature rise equals?

The expected insulation life equals?

the rerating in horsepower equals?

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