cross-section is very common for busbar shape, other shapes are used as well. Cross-sectional area for busbars is typically rated in terms of circular mils (even for square and rectangular bars!), most likely for the convenience of being able to directly equate busbar size with round wire...
The current size of copper busbar which link from rectifier to chrome tank is 12 mm x 100 mm. To me, I think it is under size since the current ampacity of it should be around 2600A (in AC, DC should be less). My question are: 1) What is the actual size of busbar I have ...