It mainly depends on what store you open. For example, the total power of the store is 60kw, and the three-phase electricity is 60kw. For the three-phase electricity, you can choose 1.5( 10), three current transformers 150 and 5.

If the current is below 100A, it is recommended to choose an electric energy meter with an accuracy of 1. For the ordinary three-phase electronic watt-hour meter, if the electrical equipment has a motor, it is necessary to choose the three-phase intelligent watt-hour meter. Because the load of the motor is used and the power is lost, the ordinary electronic meter cannot measure the complex power loss waveform.