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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  
 
Answer
# 11
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 ?    17 Yes 5 No
Khan
 
Answer
# 12
we need to consider short ckt(KA) also. Say short ckt level
is 20KA then we need to select busbar accordingly.
 
Is This Answer Correct ?    14 Yes 2 No
Md.mahmudul Hasan
 
Answer
# 13
Please Give the references........otherwise its very
confusing....!
 
Is This Answer Correct ?    7 Yes 0 No
Jad
 
Answer
# 14
CURRENT DENSITY OF CU=1.2A/MM2
CURRENT DENSITY OF AL=.8A/MM2

FOR EX: DESIGN REQUIREMENT OF 400A MAX.CAPACITY.
CONSIDER THE BUSBAR IS CU.
AREA OF THE BUSBAR=400A/1.2=333.33MM2

APPROX. VALUE= 350MM2

SO THAT, THE STANDARD SIZE IS 50MMX8MM
 
Is This Answer Correct ?    12 Yes 5 No
Santhoshsasidharan
 
Answer
# 15
The bus bar size normally for copper 1sqmm=1.25Amp and
aluminium is 1sqmm=0.8Amp
 
Is This Answer Correct ?    5 Yes 1 No
Dubai
 
Answer
# 16
We have consider so many factors to calculate Busbar sizing.
a) Current carrying capacity : for that Copper can go upto
1.6A/Sq.mm and Aluminium is 1A/Sq.mm
b) Ambient temp. and temp. rise to considered.
c) Heat loss to be considered.
d) Short circuit current to be considered.
 
Is This Answer Correct ?    3 Yes 0 No
Renukaswamy
 
Answer
# 17
Aluminum current transfer capacity :0.8 amps/sq mm
Copper current transfer capacity :1.6 amps/sq mm

Example:640 amps

x= 640 / .8 = 800 sq mm

800/10 (Say 10 mm Width)
L=80 MM, W=10 MM
 
Is This Answer Correct ?    4 Yes 1 No
Jk
 
Answer
# 18
I want to ask to vijay that is there any relation between
current denesity of copper and material purity.
also is ther any standard which defines the standard
current denesity of material.
 
Is This Answer Correct ?    2 Yes 1 No
Gajanan
 
Answer
# 19
simply the dinesty of the copper equal 2A/mm2 or 1.5A/mm2
accprding purity of the substance so using mentioned
formula to get size of bus bar .
 
Is This Answer Correct ?    2 Yes 1 No
Karim Halawa
 
Answer
# 20
Thumb rule for copper is 1.25 Amps per sq.mm and for Aluminum 0.8 amps for sq.mm 
Is This Answer Correct ?    2 Yes 1 No
Rohit Bhardwaj
 

 
 
 
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