[Solved] Current Capacity of Rectangular hollow copper bar

Smit Fefar Asks: Current Capacity of Rectangular hollow copper bar
I have visited various site which include the table for current capacity of insulated wire and the busbar but no a single website gave the any particular equation or any calculation to measure current capacity of rectangular hollow copper bar with any thickness

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It would be grateful if you guys would do any help.

If anyone can make me formula as it is there in busbar which is 1.2 time the area of conductor for copper.

Current Capacity (in amps) = 1.2 * (area of conductor)

And Also how long our conductor is does it depends or not as a factor of current capacity ?

And the ambient temperature would be 40 °C and we would cool the pipe by flowing water from hollow space in pipe.

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