Copper bus bars

http://cr4.globalspec.com/search/sitesearch?do=show&sort=textmatchrank&srch=busbar%20sizing&order=asc

Despite the helpfulness of the anonymous post with a link to the search function, forums like this are not intended to be used as a substitute for proper engineering by an experienced professional, and by the very nature of your question, you are obviously not experienced enough to be performing this task. So you are either an EE without the proper qualifications to do this, or you are not an EE at all and trying to get free engineering work over the internet, or you are a student trying to get us to do your homework for you, none of which is acceptable use of this forum. Please hire an experienced professional to do this task.

JR

You simply amaze me how you can extract that much information from a post that has so little to work with.

I = E/R. No one said what E is; but R is damn near zero, and can be calculated from copper resistivity and busbar dimensions.

REAL careful here.

That referenced thread mostly concerns CARRYING CAPACITY.

SHORT CIRCUIT sizing is a matter of mechanical stress on the bars, imposed by the magnetic and coulomb forces generated" by 'fault level' Currents many times the carrying capacity of the bus.

Factors are: Voltage, Fault Amperes, bracing strength, distance between supports, dimensions of, strength of, distance between, and orientation of bars.

The idea is that the bars are capable of handling those forces. The fault is expected to clear before significant heating can occur.

It's a specialty of switchgear designers.

Most of us have never done it.

http://www.copperinfo.co.uk/busbars/pub22-copper-for-busbars/