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This information should be taken from the motors name plate. Motor manufactures differ by small amounts even on the same horsepower. The electrical code book for calculation purposes rates a 150 HP, 3 PH, 460V motor at 180 running amps.
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∙ 13y ago
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∙ 9y agoThe line to neutral voltage on a 480 v system is 277 v and with 25 hp or 25x746 watts per phase the current would ideally be 67 amps. However due allowance must be made for the efficiency of the motor and the power factor, so the current could be 30% more, 90 amps.
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∙ 10y ago150 HP is equivalent to 111.9 kW so allowing for 90% conversion efficiency it would draw 124.3 kW of power. With a power factor of 0.85 the motor would draw 146.3 kVA from the supply.
The motor would need 48.76 kVA from each phase and with a line-to-neutral voltage of 120 v the estimated current would be 406 amps.
<<>>
The equation for amperage when horsepower is known is; A = 746 x HP/1.73 x V x pf x eff.
A standard motor's efficiency between 5 to 100 HP is .84 to .91.
A standard motor's power factor between 10 to 100 HP is .86 to .92.
So A = 746 x 150 = 111900/(1.73 x 208 x .91 x .92) = 111900/301 = 372 amps.
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