Answer / kalirajan.n

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.

Answer / himadri nayak

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

Answer / dilawar husain

yes,these factors are important for cable sizes.

Answer / venkat iyer

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%

Answer / jignesh panwala

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

Answer / sivakumar

As per answer no 5, how you take 1.5 and 690 values for
calculation? is there any reference about that value

Answer / rajnikant

Dear himadri,
i need more details for the calculation of copper and
aluminium sizes of cable and current capacity.

Answer / bubbly

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

Answer / kalirajan.n

***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.

Answer / rohit

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....

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