Answer Posted / khaled shaban

you have to calculate your ampere by using below equ.
I=P/Sqrt(3)*V*P.F
after that you have to select circuit breaker; after selection of CB check cable size referring to cable ratings as per manufacturer.
e.g. Volt 380V, with 100Kw and consider P.F=0.8
current will be 190A
cable should handle more than 190A, but first you have to choose MCCB for this load; the standard for your selection should be as following:
MCCB size = I*1.25 (1.25 at least)
so MCCB will be more than 237.5A (for standard MCCB you will select 250A)
hence your MCCB is 250A, your cable should be more than 250A.
As per cable manufacturer rating in my country, cable size should be (3*120+70)mm2 laid in duct, but in case if this cable laid in ground; cable size will be (3*90+50)mm2.

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