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Need help from electrical engineers


Confusingly Confused!
Hi all, need some clarifications from electrical engineers, in our industry we are upgrading a three phase induction motor from 30hp(22kw) to 50hp(37kw).my question is on what basis the electrical Amps rating is given to motor.I have seen some motors of 30hp whose amps rating differ from 40 to 45 amps.So, what is the correct method to measure amps?.Currently the present 30hp motor draws current of 45amps,38amps&40amps in phase 1,2&3 phases respectively at full load.What would be the current drawn from a 50hp(37kw) motor at full load?.
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