Draw the wiring schematic diagram of single-input single-output single-phase watt-hour meter

As shown in the figure, the single-phase watt-hour meter 1.2 is the current coil, the live wire enters from 1 and exits from 2, and the current coil is connected in series in the loop; 3.4 and 5 are voltage coils, and the zero line enters from 3 and exits from 4. 5 is the live wire connection point of the voltage coil, and the connection between 1.5 can't be disconnected, otherwise the voltage coil can't work and the electric energy meter can't measure correctly.