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Question
how to calculate the size of cable for 100 kva load,?can 
somebody tell me with a formula
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
KVA=uder root3*V*A/1000
A=Under root 3*415*KVA/1000
 
Is This Answer Correct ?    16 Yes 5 No
Prashant Singh
 
Answer
# 2
Considering Powe factor 0.8
Kw = KVA*.08
KW = 100*0.8
= 80 KW
w = 1.73 * 415 * Il * 0.8
80000 = 1.73 * 415 * I1 * 0.8
I = 80000/ 1.73*415*0.8
= 139 Amp

You can choose the cable which current carring capacity per
phase is on or above 140 Amp

By considering the future expansion of load the 180 Sq.mm
AYFY cable is ideal.
 
Is This Answer Correct ?    10 Yes 1 No
Virendra
 
 
 
Answer
# 3
WE CAN GET FROM THIS REALTION
KVA=KW/KVAR
100*85=85KW
THEN FIND CURRNET FROM P=ROOT 3 VICOSPHI FORMULA THEN FIND
CURRENT AND THEN LENTH FROM THE MV=VD*1000/L*I
 
Is This Answer Correct ?    9 Yes 5 No
Abdulsubur
 
Answer
# 4
Before calculating size of cable, phase & voltage should be
clear then after we can calculate the current of load by
this formula
P=root3*V*I
I=P/(root3*V)
Accodingle we can select the size of cale.
 
Is This Answer Correct ?    6 Yes 2 No
Brijesh Shakya
 
Answer
# 5
Depends on what voltage you working with.

P = V*I

You got P and V, find what your I is.

Then use a cable selection book from, eg. Olex, choose your
cable from there.
 
Is This Answer Correct ?    6 Yes 13 No
Jack
 
Answer
# 6
i think something is wrong with question ...load can never
be in KVA it should in kw if we talk about motor.....
 
Is This Answer Correct ?    4 Yes 14 No
Jiwanjot
 
Answer
# 7
if your load is single phase then you should use 3.5c x 185
sq.mm alu. Armoured cable.
 
Is This Answer Correct ?    0 Yes 10 No
Mehul G. C.
 

 
 
 
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