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Question
HOW TO CALCULATE THE SIZE OF CABLE COPPER &  ALUMINIUM
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
TAKE A LOOK IN THE FORMULA BELOW....

VD= 2*K*I*L/ CSA

WHERE:

VD= VOLTAGE DROP
I= CURRENT
L= DISTANCE OF THE LOAD FROM THE OUTLET (IN FT)
K= 12 FOR COPPER AND 19 ALUMINUM (FOR MAXIMUM TEMP OF 75 DC)
CSA= CONDUCTOR CROSS SECTIONAL AREA IN CIRCULAR MILS.
 
Is This Answer Correct ?    48 Yes 14 No
Kalirajan.n
 
Answer
# 2
Copper Wire
Single Phase/Circuit
Voltage 240
Power(W) 1000
Power Factor 0.8
Resistivity(at 15 c) 1.72E-08
Tempertature 35 C
Resistivity 3.096E-08(for copper)
Length(m) 300(phase+neutral)
Cross section(m2) 0.000006
Resistance 1.55
Load 5.21
Voltage drop 8.06
Percentage 3.36(Do not go above 3 %)
Actual voltage 236.64
Actual Current 5.28

This is a sample of how to calculate wire size for single phase copper wire. If you want contact me for the excel sheet for copper/Al, 3phase/1 phase calculation.

@ himadrinayak@yahoo.co.in
 
Is This Answer Correct ?    22 Yes 2 No
Himadri Nayak
 
 
 
Answer
# 3
Factors that to be considered are;

1. ambient temperature
2. permitted temperature rise
3. factors applicable due to method of cable laying
4. factors applicable for group running of cables
5. spacing between cables
6. permitted voltage drop say 2.5%
 
Is This Answer Correct ?    23 Yes 7 No
Venkat Iyer
 
Answer
# 4
yes,these factors are important for cable sizes. 
Is This Answer Correct ?    23 Yes 7 No
Dilawar Husain
 
Answer
# 5
As per answer no 5, how you take 1.5 and 690 values for
calculation? is there any reference about that value
 
Is This Answer Correct ?    19 Yes 5 No
Sivakumar
 
Answer
# 6
IT IS BAISICALLY DPEND UPON THE LOAD.
SUPPOSE 53 A LOAD.
53/1.5= 35 HP
35*0.746=26 KW
26000/690=38 SqMM
THIS CALCULATION IS FOR AL CABLE
 
Is This Answer Correct ?    25 Yes 14 No
Jignesh Panwala
 
Answer
# 7
Dear himadri,
i need more details for the calculation of copper and
aluminium sizes of cable and current capacity.
 
Is This Answer Correct ?    10 Yes 0 No
Rajnikant
 
Answer
# 8
Actually all brothers we want to know calculation of cable
not VD so please any one have calculation of cable on load
& distance attach here
 
Is This Answer Correct ?    8 Yes 0 No
Bubbly
 
Answer
# 9
***SUPPOSE WE USE COPPER CONDUCTOR AND WE ALLOW A MAXIMUM OF
5V MAX. VOLTAGE DROP:

5= 2*12*15*230/CSA

CSA= 82800/5

CSA= 16560 CM

FROM COMMERCIAL REFERRENCES:

15560 CM IS CLOSEST TO 16510 CM WHICH IS #8 COPPER OR 8 SQMM
WIRE.

NOTE:

1. IN THIS CASE A MAXIMUM OF 5 VOLTS WAS CONSIDERED IN THE
CALCULATION.

2. THIS CALCULATION IS NOT VALID FOR LARGE MOTORS. BECAUSE
MOTORS DRAWS A MAXIMUM OF 7OO% TIMES ITS FULL LOAD TORQUE
DEPENDING ON THE MOTOR CONTROL STARTING METHODS USED BY THE
DESIGNING ENGINEER.
 
Is This Answer Correct ?    14 Yes 8 No
Kalirajan.n
 
Answer
# 10
Dear himadri nayak could you please tell me the formula to
calculate V.D...and exact formula for calculation of cable
size..but not taking any factor as assuming,,,and if u r
assuming then hw ur assuming????dear you can mail it to me
if you dont mind..
Thanks & regards
ROHIT

waiting for your reply ASAP....
 
Is This Answer Correct ?    5 Yes 2 No
Rohit
 

 
 
 
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