This was 30 years ago so I am a little fuzzy on all of the details but when I looked for a replacement breaker, the common 2 slot breaker was only 10,000 amp and the wide breaker was supposed to be 22,000 as I recall. I did not have an AFC calc from the PoCo but I was guessing it was >10,000 since I was about 60' from a 37KVA pole pig.
Truth be told I used the 10k breaker but only until I could get the service upgraded.
... or I could just be confused. I am old you know
