How many amps does a HP motor V 3 phase pull?

The 50hp motor has a current rating of 55.4 amps if its power factor is 0.8.

Another Answer:

One horsepower (electric motor) is 746 watts, so 50 horsepower is 37.3 KW. Assumed power factor is 0.8, so divide by 0.8 to get 46.6 KVA. Assumed efficiency is 0.95, so divide by 0.95 to get 49.1 KVA. The motor is three phase, so divide by three to get 16.4 KVA per winding. It is 480V so divide by 480 to get 34.1 amperes per winding. Assumed configuration is to run on delta, so multiply by 1.732 (square root of 3) to get 59.0 amperes per phase. This is very close to the 55.4 stated before.