In the manual (step 3) it says the transformers are marked and calibrated from the factory, but where are those markings?
On the label/sticker on the side of the current transformers. Note the CTn where n is 1, 2 or 3. Corresponding with the phases 1, 2 and 3.
I see it now… Jesus Crist, how is it possible to be that blind. 
Haha 