How do you select a cable size(cu&Al)for a particular load?

Question Posted / g.shanmugam

2 Answers
7294 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

How do you select a cable size(cu&Al)for a particular load?..

above mentioned is ok. we should take distance also in an
account bcoz if there is a long length cable voltage drop
is also increase for that we increase the sqmm of the
cable..

Is This Answer Correct ?

4 Yes

1 No

How do you select a cable size(cu&Al)for a particular load?..

Answer / sreenu

Based on KW/HP value the current rating can be caluculated
and based on current rating of Mains & cable size can be
caluculated.

for example.
HP of the motor is :A HP
KW of load is :A HP/735.5*Efficiency(E).
Generally eddicieny of the motor can be asuumed 0.8 to 0.9
Current(C) is :A HP/735.5*E*(1.73*V* cosQ)
Cos Q generally asumed as 0.8 to 0.9

If the value of current is C, the current capacity of cable
reuired is Appx. 1.5*C.

Based on cable catalogue provided by the cable manufacturer
the size of the cable can be selected.

For eample. If you use al. cable, the size of cable is
bigger than copper cable.

Rating of mains: 1.5* C, but fuse arting is C only.

Is This Answer Correct ?

3 Yes

1 No

Post New Answer

More Electrical Engineering Interview Questions

Whats meant by trivector meter where it is connected at the substation?

20 Answers GPIL, Infosys, Jakson, L&T, Secure Meters,

What is the universal motor?

0 Answers

what is power load and lighiting load?

2 Answers

Why dont we get shock while testing for voltage with a line tester? How the bulb inside the tester glows while testing with tester coz we are totaly isolated from earth or we are not giving close path for the current to flow?

3 Answers

what is the IPC ? & what the uses ?

0 Answers Bhel,

what is an alternator & generator

5 Answers

374kvar capacitor bank connected across 600kw,6.6kv motor.what will happen if motor run at 50% , whether full kvar applied or half?

1 Answers NTPC,

why stone used in Transformer yard.

9 Answers Birla, Eskom,

what is reactive power and active power

4 Answers

IN a transformer during power supply how the LV and HV bushing works??

3 Answers CSEB,

What is dry and wet flashover.

1 Answers

A dc motor running on dc drive whose input is 3ph AC what will happen if we change the phase sequence of dc drive for e.g (R Y B) is connect as R B Y, will the motor run as same as previously running before changing phase without any effect

4 Answers

For more Electrical Engineering Interview Questions Click Here