It's important to do a job properly !!
CT's in the correct way.
I case of multitap CT's it is very important that P1 - P2 sides S1 - S2 sides are connected up correctly if high accuracy is required.
On the lower tappings there is a compensating wire in parallel with the main CT current wire. This one is of smaller diameter. It's there to allowe for compensation to have good acuracy.
Some classes are stated as followes
500/750/1000/5 Amps class 1.0/1.0/0.5
The compensation is for the 500 and 750 tap.
