Sunday, June 19, 2011

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How to find out the Full load current [Relation between horse power and kilo watt] and how to select a proper cable [Power cable size selection chart]

  • Sunday, June 19, 2011
  • denizen robo
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  • In previous posts i have explained about electrical drawings, electrical panel component etc.. For smooth working of motor which is connected to the mcc panel, cable size selection has an important role. We have to consider lot of things for selecting a proper cable, like motor rating (Kilowatt,Horse power),Voltage(230v, 415 v etc.),Phase(Single, 3 phase),Temperature, Distance between motor and mcc.
    Before that i will expalin how to find out the cable current rating.
    1.Incoming suppy cable rating.
               Motor Full load current * 1.2
    2.Inside cables – Motor circuit cable rating.
               Motor full load current * 0.7

    Now you will be having a doubt how to find out the full load current of a motor?

    Formula for finding full load current of a motor.

    3 phase:
                Full load current=(746*hp)/(1.732*V*pf*eff) or KW/(1.732*v*pf*eff)
                                     hp=horse power
                                      v =Voltage
                                      pf=Power factor
                                     ef=efficiency
                                  1 hp=745.7 W=0.746 kw

    Single phase motor Full load current table [Horse power,Kilo watt]

    full_load_current_chart_table_single_phase_motor_hp_kw

    Three phase motot Full load current table [Horse power,Kilo watt]
    three_phase_motor_full_load_current_calculation_horsepower_kilowatt_conversion

    Cable size selection chart-Single phase
    single_phase_cable_size_selection_chart_full_load_current

    Cable size selection chart- Three phase

    1 Responses to “How to find out the Full load current [Relation between horse power and kilo watt] and how to select a proper cable [Power cable size selection chart]”

    Nam KK said...
    June 12, 2013 at 1:46 AM

    THANK YOU !


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