John, I am in this camp as well. Why can't the let-thru tables be used to indicate the lower fault current when these fuses are installed? For instance upstream of a switchboard?
In New York City we see this all the time. Con Edison provides 200kAIC at various locations within their network, but they do not make a switchboard higher than 200kAIC. If you use software to perform a short circuit analysis, including the impedance (X/R), you'll likely get values over 200k. So what are you supposed to do in that situation? Do you tell your client there is nothing they can do? In reality, when there are CL fuses installed, the fault current will not be the 200kAIC they claim.