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Question
```How to calculate busbar size & what is the procedure we
make for determine that?```
Question Submitted By :: Bala123
I also faced this Question!!     Rank Answer Posted By

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 11
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 ? 33 Yes 14 No
Jaydev Jena

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 12
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 ? 74 Yes 11 No
Sujata Wagh

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 13
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 ? 28 Yes 10 No
Bhavin Shah

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 14
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 ? 12 Yes 4 No
Khan

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 15
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 ? 18 Yes 5 No
Waves

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 16
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 ? 11 Yes 2 No
Md.mahmudul Hasan

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 17
Please Give the references........otherwise its very
confusing....!

 Is This Answer Correct ? 4 Yes 0 No

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 18
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 ? 9 Yes 4 No
Santhoshsasidharan

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 19
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 ? 1 Yes 0 No
Gajanan

Re: How to calculate busbar size & what is the procedure we make for determine that?
# 20
The bus bar size normally for copper 1sqmm=1.25Amp and
aluminium is 1sqmm=0.8Amp

 Is This Answer Correct ? 2 Yes 1 No
Dubai

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