I recall the discussion being it did not apply because it was not a load side connection. But most of the electricians land the service entrance to the breaker not to the Buss. I guess if it wasn't existing and you where building this new you could hit the buss with the service conductors.
Thanks I was following the last few comments and there seems to be some discussion on the 225 amp rated MLO panels Buss. But if the service entrance buss was 200 amp rated won't that proceed the 225 amp MLO Buss
I know utility bus was mentioned, but IMO there is none. The service entrance conductor terminates directly to the service disconnecting means (i.e. the 200A breaker). I'm open to being corrected.
The 225A MLO panel bus is considered a feeder bus... but it's rating cannot technically be used for the 120% rule because the wire portion of the feeder is only rated 200A.
If prevailing conditions do not meet the requirements for the desired installation, down-rate the main breaker, or up-rate the feeder as required to match conditions, if possible. If that don't work, replace everything with equipment that meets the requirement(s).