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
5681 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 doid

0 Answers

what is LT & HT?

6 Answers

what is form factor

2 Answers

why the alternator rating in kva generator in kw.

2 Answers

why field winding is placed on rotor winding not on stator winding in case of synchronous machine?

13 Answers HAL, TATA,

Explain the operation principle, advantages and disadvantages of the following converters: a) A 12 pulse converter b) A Switch-mode inverter c) A thyristor inverter

0 Answers

What is the differance between Digital Energy meter & Static energy meter? why the KWH diferance between both meters.

3 Answers Raychem RPG,

how to interlock 3 incomer-ACB,1 buscoupler ACB,... pls answer this question and if possible send me the ckt diagram..haifriends2910@gmail.com

0 Answers

What is electrical grounding?

0 Answers

what is the clear formula to calculate cable size for a load

0 Answers TCS,

why current is denoted by I

7 Answers CTS, GCT, Samtel,

how to improve power factor correction?

3 Answers

For more Electrical Engineering Interview Questions Click Here