OP, as already said, have a go at it and then post your answer, people will help then. You might know more than you think you do.
Don't feel too bad either, I know "Electricians" who would be embarrasingly stuffed with that paper,
The joke is, in my experience, half the so called sparks in the industry don't understand ADS properly and also the difference between fault and overload protection so it is important to learn it right.
It would seem, Select cable from CCC only with no rating factors applied, oversize it to allow for lack of design knowledge lol...... and hope the Zs is low enough for the PD. That is the standard design practice for many out there.
As for the adiabatic for sizing cpc's......very few out there can even do that.This is not reflected in people on forums such as this as if they are on a forum, they are generally more interested to even be on here in the first place.