3 phase motor cable size, Contactor size, Starter selection chart: Note that, we did not include the voltage drop across the cable. Look at the Cable current rating Chart, 2.5Sqmm copper has the ability to carry 18 Amps, hence 2.5sqmm is suitable for 5.5kW/7.5HP motor Hence, the required cable shall able to carry minimum 15A current.
Let’s we calculate required cable sizing for 5.5kW/7.5HP motor which is operated at 415V, 0.86pf.įrom our cable size calculator, the full load current of the 5.5kW motor is 10A. Hence the cable rating formula can be written as, The cable size is equal to the 1.5 times of the full load current of the motor/load. Learn More: Transformer Cable Size Calculations Calculator
