Answer / thiagarajan.e

motor full currentx1.25times to the nearest cablesize

Answer / babul

pls my need brb cable amp to watt formula to calculate

Answer / rajkumar mohan

For simple easy remembering...

Make ur own excel sheet as per below
(its strictly not a technical way)

for Eg:for breakers 10-100 dive the breaker value with 4.5 you will get some value go to thte next cable size

10A

10/4.5 =2.2sq.mm
go to 2.5 sq.mm
--------------------------

you can use this formula till you are familiar with the cable sizes (Y)

Answer / hosam

you have 100kva pole type TX
POWER 100x0.8= 80 kw
total load aprox: p= 47 kw
tx capactiy rate 47/100 =% 47 load
the resistance of earthing to be less than 3 ohms.
cable cu 70 squ mm to load 47 kw lengh 100 mtr
%e1= 0.0124(47x100)/70= 0.85 tolal load
from tx to panels supply 32.5 kw lengh 50mtr cable 4cxm35 mm squ + 14.5 kw lengh 25mtr cable10 squ mm
%e2= 0.0124(32x50)/35= 0.56
%e3= 0.124(14x25)/10= 0.4
%e = %(0.85+0.56+0.4)= %1,81 < %3
total of the voltage drop is acceptable

Answer / eng.saif.

Hi friends,
I want to exact formula of cable size and example ??? please anyone give me ans..........

Answer / safdar

dear.first we need to know about amp range.
example 50 amp which i have to select cable size according amp load.
amp range/5 up to 30 amp
and amp range / 4 up to 125 amp
more than it amp of range amp /2

Answer / abhishek gupta

For 400V 3ph AC system

# For 1% permissible voltage drop

size of cable in mmsq (aluminium cable)=( I*L) /80

# For 2% permissible voltage drop

size of cable in mmsq (aluminium cable)=( I*L) /160

# For 3% permissible voltage drop

size of cable in mmsq (aluminium cable)=( I*L) /240

I = Full load current
L = Length in meter from load center to motor

Answer / qasim riaz

sir plz send me proper formula for cable size calculation

Answer / tanu saxena

as u know power=v*i*power factor
the load is given in KW
SUPPOSE THE LOAD IS 30KW
FOR THREE PHASE VOLTAGE IS 440V
THEN, 30*1000=440*I*O.9(SUPPOSING PF)
30*1000=396*I
THEN, I=75AMP
FOR ALUMINIUM CABLE 1Sq.mm=1.5 amp of current
for copper cable 1sq.mm=5 amp of current
then, your cable size is 15sq.mm for copper cable

Answer / shine

it is easy,just refer some catalogue from a cable retail shop u idiot.

What is meant by "tampering detection" of a electrical energy meter?

3 Answers  

what is the star delta connetion and how can do it a three phase motor with control witing with picture

0 Answers   Aurobindo, SA Kent, Wipro,

Our transformer capacity is 500kva & voltage ratio is 11kv/433v step down tf.Now i need to know if my input voltage is 10500v and what would be the secondary side voltage i.e output voltage ?

3 Answers   Helma,

what is relation between voltage and current and don't take resistance here. if we supose say when there is increase in voltage whwt happens to current?is it decrease or increase?

4 Answers  

what is difference between KW,KVA,KVAR? also give me the formula for all the three...

3 Answers  

What is the kva?

2 Answers   Makino Auto, SAL Steel Power, Sapphire Group,

In ac circuit R,L,C are connected in series what is the output the circuit? explain

4 Answers  

In Aeroplane what circuitry or method use for earthing?

9 Answers   Bhel, EDA, Wind World,

HOW CIRCUIT BREAKER RATING CALCULATED?WHAT ARE THE PARAMETERS CONSIDERED?

5 Answers  

sir, i want to know the calculation for find rated current for cable sizes.(both copper & aluminium) with examole. please sir for example: 35sq.mm al.cable is withstands for how many amps? is suitable for 45kw motor?

5 Answers   L&T,

in 3phase 50kva dg what is the full load current for single phase laod

6 Answers  

what is the difference between star connected and delta connected motors

3 Answers   Welspun,