- The HVAC equipment needs to have an SCCR equal to or greater than the Available Fault Current AT THE TERMINALS OF THE EQUIPMENT.
- Yes, you factor in the impedance of the conductors between the service entrance and the equipment.
But the others are right, it's unlikely that you actually have 65kA available. Gear is made in incremental values, like 25kA, 35kA, 42kA and 65kA (it's different for different mfrs). So if your brand offers 35kA and 65kA, but the AFC is 40kA, someone had to buy the 65kA rated equipment. And ITS rating is only relevant for ITS line terminals. If that 40kA at the Service Entrance drops to 34kA by the time it gets to your HVAC equipment, then your equipment need only be rated for at least 34kA.
Now... side bet.
Its going to have a rating of 5kA SCCR because nobody thought to make that part of the purcjhse specifications, so the HVAC supplier is just going to give you the "courtesy" untested rating of 5kA... If the gear has not been bought yet and you are asking this because you are thinking ahead, BRAVO!