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whats the voltage??? at480 volts the Fla would be 33.75 or 35 amps. at 230 volts it would be 70 amps. i would go with the 480 myself because its less amps.

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The voltage stated in the question is 600 volts. There are 746 watts in 1 HP so in 20 HP there would be 746 x 20 = 14920 watts. I = W/E. 14920/ 600 = 24.8 amps. The proper formula to use would be I = HP x 746/1.73 x E x %Eff x pf. Without knowing the efficiency and power factor of the motor an accurate answer can not be given. In the trade, a quick rule of thumb is, for 600 volt motor installations, it is 1 amp per horsepower which is close enough to calculate the feeder wire size.

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