3 phase motor

Discussion in 'General Electronics Chat' started by rcraggs, Jan 30, 2010.

  1. rcraggs

    Thread Starter New Member

    Jan 30, 2010
    1
    0
    Im looking for a calculation for Full Line Current but I only have a voltage rating of the motor and the Horsepower any suggestion ??
     
  2. sgardner025

    Active Member

    Nov 5, 2009
    79
    4
    What HP and voltage? If you know the efficiency and power factor ratings you could use (HPx746)\(Voltagex1.73xEfficiencyxPF). Table 430.250 from the NEC will also give you a rating.
     
    Last edited: Jan 30, 2010
  3. obadosa

    New Member

    Aug 2, 2007
    1
    0
    it is usually assumed that the power factor and efficiency of a three phase motor are 0.8 and 0.85 respectively.
    I hope it helps
     
  4. BillB3857

    Senior Member

    Feb 28, 2009
    2,400
    348
    A rule of thumb we used is 1-1/2 amps per horsepower at 480VAC 3 Phase. Not exact, but pretty close.
     
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