Hi I did my am2 last week
Ze just measure each phase to earth and record the highest reading
We were told didn’t need to do pefc just pscc done same as ze except test between each phase and neutral then double highest one and record reading, were ever it says ze db just write your ze in.
You do polarity between all phases to earth, all phases to neutral, between all phases and neutral to earth, ze, pfc, phase sequence at board, then power on, phase rotation at each 3 phase circuits, rcd test then calculate your zs for each circuit.
Do functional tests and u have to write all calculations down