ALLInterview.com :: Home Page      
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   Errors
   Refer this Site  Refer This Site to Your Friends  Site Map  Contact Us      
   
 
Categories >> Engineering >> Electrical Engineering
 


 

 
Question
How to calculate busbar size & what is the procedure we 
make for determine that?
 Question Submitted By :: Electrical Engineering
  I also faced this Question!!      
Answer Posted By  
 Answers were Sorted based on User's Feedback
Answer
# 1
Generally current carrying capacity of Al. is 0.8A per
sqmm and Copper is 1.6A per Sqmm.

Suppose we need bus bar for 630A, and we are going with
Aluminium bus bar

= 80*10*.8=640A
where 80*10 is size if bus bar usually available is the
market.
so we can use 80x10sqmm al. busbar per phase for 630A.

for TPN- (3.5)x80x10


If we are going with Copper bus bar
than we will use = 40x10sqmm per phase

= 40x10x1.6=640A
where 40*10 is size if bus bar usually available is the
market.
so we can use 40x10sqmm copper busbar per phase for 630A.

for TPN- (3.5)x40x10 

Is This Answer Correct ?    88 Yes 12 No
sujata wagh
 
Answer
# 2
The busbar size will be determined by the total loads
connected to the bus.This will require a comprehensive
study of nature of loads plus the surroundings of place.
The general procedure will be such that the operating
parameters don't voilate the maximum safety limits of the
bus. 

Is This Answer Correct ?    120 Yes 52 No
ashraf majid
 
 
Answer
# 3
to calculate bus bar size normally for copper 1 sqmm =1.3 A
for aluminium 1 sqmm =0.8 Amps 

Is This Answer Correct ?    84 Yes 28 No
kajajohn
 
Answer
# 4
i want to add in vijay answer that the qulity of copper also
depend on amper rating of coper bar 

Is This Answer Correct ?    46 Yes 16 No
akmal
 
Answer
# 5
The bus bar size normally for copper 1sqmm=1.3Am and
aluminium is 1sqmm=0.8Amp 

Is This Answer Correct ?    42 Yes 15 No
nikhan
 
Answer
# 6
current density= .8 amp/sqmm.that does mean 1sqmm can carry
0.8 amp current .if sisze of busbar is 100mmx 10 mm then it
can carry 800 amp. 

Is This Answer Correct ?    44 Yes 18 No
jaydev jena
 
Answer
# 7
busbar sizes can not be calculated only from overall size.
there are various derating factors like arrangment of
busbar, nos of busbar, spacing, enclouser size, ventilation
in room, temp rise, skin effect, proximity effect etc.
which need to be consider while designing the busbar. 

Is This Answer Correct ?    36 Yes 12 No
bhavin shah
 
Answer
# 8
can you give any example at any parameters? 

Is This Answer Correct ?    56 Yes 34 No
balakrishnan
 
Answer
# 9
Usually busbar sizes selection depends mainly on two
factors. Which is current + temperature. The size which you
are going to select must carry the current you need and
must not create much heat which excess the limits.

Our formula , we use 1.5 A / 1 sqmm. 

Is This Answer Correct ?    20 Yes 5 No
khan
 
Answer
# 10
Generally current carrying capacity of Al. is 0.8A per
sqmm and Copper is 1.6A per Sqmm.

Suppose we need bus bar for 630A, and we are going with
Aluminium bus bar

= 80*10*.8=640A
where 80*10 is size if bus bar usually available is the
market.
so we can use 80x10sqmm al. busbar per phase for 630A.

for TPN- (3.5)x80x10


If we are going with Copper bus bar
than we will use = 40x10sqmm per phase

= 40x10x1.6=640A
where 40*10 is size if bus bar usually available is the
market.
so we can use 40x10sqmm copper busbar per phase for 630A.

for TPN- (3.5)x40x10 

Is This Answer Correct ?    21 Yes 6 No
waves
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what is power system transient condition   1
2. If 8.35%Z means the percentage impedance of 132/11kV transformer self,will like to reconfirm the percentage impedance that is supplied from power company?   2
which motor is used in mixies   9
what will happen if dc machine are supplied by ac source??   1
What is the meaning of maximum demand   21
Why Trasformers rated in KVA hal 13
What is the function of the serge absorber?   5
How to calcluate the current by means wires/cables in square mm   2
how to find motors H.P. whout any rating? (only give you a motor and multimeter) l&t 3
low voltage means how much voltage? extra low voltage means how much voltage? medium voltage means hos much voltage? high voltage means how much voltage? Ex: low voltage - 1volt to 240volt like this   3
Why D.C Voltage used in Meggering...as well as in Hipot test? why not A.C?   1
HRC full from   6
 
For more Electrical Engineering Interview Questions Click Here