How to calculate the BusBar size?

[megatronic]

can any engineer show me how we can calculate the busbar for any distribution panel assum that we have 800A interrupting capacity 50 kA, 320V/220V

also, if we make an calculation how can we determain the apprperat busbar.
thank you

 

[dlgoff]

Here's an iPaper for http://www.scribd.com/doc/2677322/Busbar-Design".

 

[megatronic]

thank you dlgoff that will help me