How to install an electric meter and how to distinguish between incoming and outgoing lines?

The installation method of single-phase ammeter is one in and one out. Simply put, an ammeter is an electrical appliance that measures current. We generally use 220V for ordinary users, and the voltage between live wire and neutral wire is 220V, so the meter needs a live wire and a neutral wire. The live wire on the electric meter is the power supply. The first hole is connected with an electric meter, the second hole is a household load line, the third hole is a neutral line in, and the fourth hole is a neutral line out. When your home appliances are electrified, it will generate current, which will enter the meter through the load line and generate active power. As the saying goes, how many degrees of electricity are sent. Similar to a water meter, the water from the water supply company will pass through your water meter when it arrives at your home, and the water meter will calculate the water consumption of your home through pressure.