Originally Posted by hawkeye23
These two highlighted statements from your original post are the problem. These are NOT the same thing. If you do not know how to determine the maximum short circuit current available, that's where you need to start.
The kAIC ratings of the breakers are selceted by someone who USED that information, but the breaker ratings do not tell you what the value is IN THE CIRCUIT. So for example if the breakers are rated 25kAIC, the maximum fault current in the circuit should* be something less than that, but it could be ANYTHING less than that, right down to 1000A. Worse yet under some circumstances it may even be more than that. You cannot use the numbers on devices for this purpose.
*Should, but see dkidd's comment above.
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