if we want ot select cable size with reference to load current it take than wh

if we want ot select cable size with reference to load
current it take than what is the formula and it is same for
aluminium or copper?

Question Posted / jay pandya

3 Answers
5959 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

if we want ot select cable size with reference to load current it take than what is the formula an..

Answer / mahesh sali

while selection of cable u should followed the below steps ;

1) cal. the full load current If.L= ( kw / 1.732 x v x
p.f. )

Assume the voltage drop of system as per application says
for motor it should be 10% Vd = 10%

2) Vd = ( 10/100) * v

3) Vd/ph. = ( Vd/1.732 )

4) R = vd/ph./IF.L

5) R-Rho*L/A

Assume , for Copper cable Rho = 1.72 e-8 Ohm-m
L = Length of cable
Base on the above assumation u can easily cal. the size of
cable.

After cal. the cable size , add. 25% extra in ur cal. the
cable size .

Thanking u

Is This Answer Correct ?

2 Yes

0 No

if we want ot select cable size with reference to load current it take than what is the formula an..

Answer / k.prakashchandra

In case of transformers, for copper cable 2.5A/sq mm and Al
i.5A/sq mm ,for generators 1.5A/sq mm and 1 A/sq mm
respectively.For others 4A & 2.5A per sq mm

Is This Answer Correct ?

2 Yes

0 No

if we want ot select cable size with reference to load current it take than what is the formula an..

Answer / naveen perugu

for copper cable 4Amps/Sqmm is the standard practice and
for alluminium 3Amps/sqmm is the standard practice for
safer operations

Is This Answer Correct ?

4 Yes

8 No

Post New Answer

More Electrical Engineering Interview Questions

what is meant by directional earth fault and non directional earth fault? describe both.

1 Answers

what is the highest voltage for transmitting electrical power in india

5 Answers

What is meant by field loss in a DC motor?

1 Answers

The transmission does not have options: a)Partition noise b) Flicker noise c) resistance d) Short noise and reason

1 Answers

can we make a electric generator,which can not use any type of fuel,air,solar,gas,thermal,coal,petrol,etc and able to produce electrical energy (or self electricity generating generator)

1 Answers NTPC,

electricity board have asked me what size meter i need fitted in my garage, its a 415volt supply and i want to run six 20amp supplies tolifts and things plus ten florry lights , what kva meter do i need??

2 Answers HCL,

Why earthing is required, and what effect in earthing result is more than 5 ohm and less than 5 or equal to 0 ohm

2 Answers

what is the working principle of DC generator ?

10 Answers DRDL, HCL,

Why the generator rating in kva

32 Answers CompuCom, DLF, Genpact, HNG, SIPM,

why open-delta core of 11kv Potential Transformer is 11000v/1.732/110/3?

1 Answers

whit is 33kv power 300*300 cable full current with formula

1 Answers

What are merits & De-merits of State-Space Method? What is series programming, parallel programming, general programming & direct programming ? And, difference between these programmings Techniques ?

1 Answers

For more Electrical Engineering Interview Questions Click Here