The 80% rule is for running circuits and for breakers. It has nothing to do with actual load capacity. I.e. with 200A service you can have well beyond 200A nomi

The 80% rule is for running circuits and for breakers. It has nothing to do with actual load capacity. I.e. with 200A service you can have well beyond 200A nominal worth of breakers in your box (250A), but when all those things are running it should still use 200A or less if the 80% rule was followed.