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What are the resistance values on a 10 horsepower 480 volt 3 phase motor phase to ground?
Wiki User
∙ 10y ago
The resistance depends on how big the motor is. A small motor (less then 2-3 kW) , have greater resistance than a bigger one. Typically small motors have from 10 - 20 ohms to a few ohm. A 13 kWatt motor have typically 1-2 Ohm. A big 400 KWatt's motor have typically 10 milli ohms between the phases.
Wiki User
∙ 14y ago
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This is the formula for horsepower. HP = I x E x 1.73 x %eff x pf./746. The efficiency of the motor will have to be guessed at along with the power factor. A motor has a lagging power factor so will use a value of .85. For the efficiency of the motor lets say 90%. The value of 746 is the amount of watts in one horsepower. Now applying the values we end up with a HP value. HP = 1.7 x 480 x 1.73 x 90 x .85/746 = 1080/746 = 1.45 horsepower.
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