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Join Date: Aug 2011
Posts: 15

# Copper Busbar Calculation Doubts

09/27/2011 8:06 AM

Dear Electrical Engineers and All ,

Here i have mentioned the calculated value of current rating for Copper busbar can anyone of you can crosscheck and tell me is it correct, as am not an Electrical engineer please help me out with this

Current density 2 A/mm2

Length of busbar 1176 mm

Width of bus bar 300 mm (assumed)

Thickness of bus 16 mm (assumed)

Cross-sectional area 4800.0 mm2 If the temperature rise of the conductor is 50°C above an ambient of 40°C and the resistivity of the copper at 20°C is 1.724 mWcm, then the above formulae become:
Length 1176 mm (i) Flat bars:
I = 1.02* {(A

0.5 P 0.39 Ө0.61) / ((1.05+αӨ) ρ) 0.5}

Temperature coefficient of copper at 20

oC ,α

0.0068 (

oC)-1

 where I = current, A A = cross-sectional area, mm2 p = perimeter of conductor, mm q = temperature difference between conductor and the ambient air, °C a = resistance temperature coefficient of metal at the ambient temperature, per °C r = resistivity of copper at the ambient temperature, mW cm
Resistivity of metal at 20

oC ,ρ

1.72E-06 Ω.cm
Temperature difference ,Ө

(Temp. rise=40oC

Ambient Temp.=32oC)

8

Current rating

3958.81 A
Actual current passed 5890.44 A

Since Required current value is not matching with the current rating , what should i do now to acheive current rating ? .

Also TWO copper bus carrying same current of 5890.44 A how far it should be spaced in-between ?

Pathfinder Tags: Busbar Copper current rating
This discussion was "closed" on 09/27/2011 10:06 AM. No new comments are allowed.
Anonymous Poster #1
#1

### Re: Copper Busbar Calculation Doubts

09/27/2011 9:44 AM
Guru

Join Date: Oct 2008
Posts: 42294
#2

### Re: Copper Busbar Calculation Doubts

09/27/2011 9:46 AM

Why don't you acquire your knowledge like most of us. GO TO SCHOOL!!!! Or at least read a book on the subject. Or visit one of the dozens of web sites that explain this. Or find an on-line calculator, that can do your job for you.

I think you are just lazy! Tell us why we should do your work for you!

Off Topic (Score 3)