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Question
How to calculate the current carrying capacity of 
electrical cables
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 11
for 50KW motor
p=50
I = 50x 1.2 (thumb rule)
=60 A

Size of cable : 60x0.2(thumb rule)
: 12

so min size of cable req. 12 sqmm.
 
Is This Answer Correct ?    6 Yes 5 No
At
 
Answer
# 12
BY SIMPLE
CURRENT DENSITY = LOAD CURRENT/AREA

FOR COPPER OR ALUMINIUM CURRENT DENSITY CAN BE VARIED ACCORDING TO OUR DESIGN.FOR GOOD DESIGN CURRENT DENSITY SHOULD BE REDUCED WHICH HELPS IN EASY TEMPERATURE DISSIPATION.

CONSIDER CURRENT DENSITY OF 0.6A/SQ.MM FOR cu OR AL
LOAD CURRENT-100A
THEN
0.6=100/AREA
AREA=166 SQ.MM

MEAN THAT 166 SQ.MM REQUIRED TO CONDUCT 100A.
 
Is This Answer Correct ?    2 Yes 7 No
Manojkumar
 
Answer
# 13
from the size of the cable we can find particular sq mm we can
send some current
 
Is This Answer Correct ?    111 Yes 130 No
Karthik Raman.b
 
Answer
# 14
p=1.732vicos8 
Is This Answer Correct ?    15 Yes 48 No
Jitendra Chauhan
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
why using 3 phase   1
Going in for a three phase motor or a single phase motor, what factor should be considered for this? For eg., to pump water to certain height and such domestic applications, which motor is suitable?   1
why does a dc machine has high efficiency while working as a generator than as a motor   1
What is the impedence of Transformer?   2
what r the tests on the 3 phase transformers can any one explain how to test using megger on transformers thx   2
Is it possible to make 0.75KW motor earthing from MCC panel by using the 1.5 SQMM, 4 core cable, means 3 core for 3 Phases & 1 core for Earth terminal?   3
what is the difference between ac drives and dc drives?   1
How can Inductive load reduce the line voltage of HV transmission line and vice versa Capacitive load?   1
In auto transformer if power transferred inductively and conductively are same, the ratio of output/input voltage is A 1 B 0.7 C 0.5 D none of above   1
why the transformer neutral earthing is to be done by copper flat only,if we use GI flat what is the disadvantage.   2
Why we use cosine angle for calculating power factor not in sine angle ?   3
what is breaking capacity   1
 
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