Cupper Busbar Current Capacity

Greater than 10000A!

Must be greater than 10KA and also depends on short circuit capacity...........

It's more complicated than the question you've asked. Rather than in and out, there's 10kA that goes through the bus bar. If there is the potential for a higher fault current, you need to know what the fault current would be. Once you know those parameters, then you can calculate the appropriate bus bar cross-section required to handle the current and have the appropriate temperature rise. Typically, bus bars are designed for a 30degC temp rise from ambient.

Ken Brandmier, Custom Electronics
www.customelec.com