JBD:
OK, you are allowed to be picky!
SCA that you calc result in a shall we say amperage figure that you use to determine the AIC of the buss bracing, and the OCP; right?
Based on the above I used the term KAIC, which is the basic end result of the calcs.
Perhaps my bad choice of terms.
Yes, you do use the SCA to determine what the AIC of your protective device needs to be. But you use the SCA, not the AIC, when making arc flash calculations.
A similar concept is how we use load amps to size branch breakers, but, we do not use the branch breakers to size the main service.