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19 October, 11:39

What is the minimum current rating of the motor disconnecting means for a 40-horsepower, 208-volt, 3-phase squirrel-cage motor?

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  1. 19 October, 13:11
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    The minimum current rating of the motor disconnecting means is 165 Amperes.

    Explanation:

    First convert the given power into units of watt. Since,

    1 horsepower = 746 watts

    Therefore,

    40 horsepower = 40 x 746 watts

    40 horsepower = 29840 watts

    Since, we know that:

    Power = Full Load Current (FLC) x Voltage

    FLC = Power/Voltage

    FLC = 29840 watts/208 volts

    FLC = 143.46 Amperes

    Now, the current for disconnecting means is at least 115% of the FLC, for the motors rated at 600 Volts or less.

    Current for Disconnecting Means = (1.15) (143.46 A)

    Current for Disconnecting Means = 165 Amperes
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