How to calculate cable sizes in sq.mm. with using motor KW?
Any formula there?
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Answer Posted / sagir siddiqui
First of all you need to verified full load current of motor,
How can you calculate:
Ex: 1 Motor - 20HP 3ph. 415V 50Hz, 80% efficiency
Cal: A= HPx746/(sqrt3xVoltxPFxefficiency)
=20x746/1.732x415x0.8x0.8
=32.43Amp.
We all know that a motor has 1.5 times starting current,
Then 32.43x1.5 = 48.65Amp
Now you can see in the current currying capacity of cable from manufacturer cable's list.
3.5 x 35 sqmm xlpe cable is sufficient for full load.
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