That is not exactly the way I read that. It says 100% of the non continuous load and 80% of the continuous load.
The examples actually say you can use the conductors at 100% on a feeder if you have a 100% breaker.
If the conductors are sized using the 80%/100% rule, you should be able to install a breaker that protects that conductor at 100% if I read the trip curve right.
When you read the Schnieder page it says "regular" breakers will carry 100% of their rating and goes off talking about enclosure size etc.
http://static.schneider-electric.us/docs/Circuit%20Protection/0600DB0101.pdf
