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Current rating for busbars

How does one go about calculating the current rating of self produced busbars?Store bought wires are a lot easier, as they have the derating factors for parallel wires and ambient temperature readily available (e.g. Radox: http://www.beichang.cn/pdf/RADOX%20CURRENT%20CARRYING%20CAPACITY.pdf)Do the manufacturers just come to these conclusions through testing?I know there are a lot of factors playing into this, but am just looking for a ballpark estimate. This link is useful, but is for wires and not busbars. Will there be a meaningful difference...Read more