Article 4.11.1.H : How to connect 3 Phase Amp meter and 3 Phase Kwh meter with common RYB CT?
Yes, we can connect 3 Phase Amp meter and KWH meter with the same CT. not need of separate CT for both meters. The same RYB CT's may connect to both meters for measurement.
Please do the connection of CT to meters as explain below.
R phase CT S1 connects to the Amp meter S1 terminal and S2 of Amp meter short with Kwh S1. R phase CT's S2 would be connected to the S2 terminal of KWh meter. So these two meters are connected in series and we received both meter details with the same CT.
The same thing will be done for the other two phases Y and B.