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3 phase supply is there Total kw 100 howmuch cable put the load
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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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We have drive feeding an output contactor for a 5000 hp motor @ 5kV application. The motor FLA is 629amps x 1.25% service factor = 786.25 amps The cable that we current have in place between the drive and the output contactor is 350kcmil- MV-105 (parallel cables). Per the NEC table 310.60 (C) (69). This show the cable ampacity is at 615 amps per cable for a rating of 1230 amps. We have derated the cable for the cable tray and the multiple cables application and our calculations show that after the correction factor factor we are at 922amps. 1230 amps x .75% correction factor factor = 922.5 amps. The customer is driving us to then use another safety factor of .25% off of the already derated cable. Can you please provide a longhand calculation for your solution on this application?
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