The grounding wire is divided into two steps: 1. Three-eye socket is equipped with grounding wire, left with zero wire and right with phase (fire) wire, and reliable metal shell of washing machine and refrigerator is also grounded. 2. The grounding wire is grounded, and metal objects such as steel pipes and angle steel are buried underground. Choose according to the resistance value of the ground, then connect it to the distribution box with wires, and then connect it to each socket.

It is more troublesome to follow the rules.

The grounding wire is laid outdoors at a distance of 2.5 meters from the wall, and there are three grounding electrodes (each 2.5-meter angle steel is 40X40X4, or a G50 round steel pipe must be hot-galvanized to prevent rust or corrosion by the land, and it must be hot-galvanized instead of cold-galvanized). They are arranged in a row at a distance of 3 meters, and keep a distance of 2.5 meters from the external wall. They should be driven vertically into the ground, and the upper end should be 0.8 meters below the ground.

The grounding belt consists of 40X4 hot-dip galvanized flat steel. The upper ends of the three grounding electrodes are connected by electric welding, and the upper end of the middle grounding electrode is connected with a grounding flat steel to the shell and grounding electrode of the indoor distribution box. The buried depth outside the wall is below 0.8m;

Install the lightning rod downlead, which is made of 25X5 hot-dip galvanized flat steel, and leads down along the external wall to 0.8m below the ground, and then leads horizontally to the grounding electrode, which is welded with the grounding electrode by electric welding, without being connected with the grounding flat steel in the middle. Note: Generally, when the led flat steel is off the ground 1 m, a disconnection clip should be made to measure the grounding resistance. That is to say, if the lightning protection grounding resistance can't reach the standard value, lightning rod or lightning belt must be added, otherwise the lightning protection effect can't be achieved. In addition, the position of the roof lightning rod is also specified. If the lightning rod is placed incorrectly, the whole house can't be protected, and it is possible to build a house. This kind of lightning strike happens from time to time.

The grounding resistance of distribution box is 10 ohm alone, and the grounding resistance of lightning protection is 4 ohm alone. After the two grounding electrodes are connected at the grounding electrode outside the external wall, the grounding resistance becomes 4 ohms. Therefore, the grounding resistance should be 4 ohms. If not, increase the content of grounding gas.

All the above practices are for the safety of the house and the safety of people. If you are not careful, you may not meet the requirements.