KAIC rating of panel and breakers

[Jraef]

The panel overall SCCR rating is equal to the lowest device, so in your example it would be the buss rating not that of the breakers.

Note that he said “SCCR” here. A PANEL cannot have an “AIC” rating, because the “I” in AIC is “Interrupting” and a panel does not interrupt anything. A panel needs sufficient BRACING to hold together UNTIL the fault is interrupted by the breakers. We used to call that the “withstand rating”, now it is called the Short Circuit Current Rating (SCCR) because it involves more than just the withstand.