If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for

If we use 250A MCCB as a incomer in Control panel for a fault level of 50kA for one second ,assuming temperature rise from 85 Deg. to 100 Deg , Then what will be the Aluminium Bus-bar size for 250A MCCB?

Explain in detail.

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