1. The function of the ground wire is to lead the electricity from the potentially charged metal shell to the earth to prevent people from getting an electric shock.
2. The grounding wire can divert the leaked current to the ground to avoid electric shock.
3. The grounding wire is mainly to prevent electric leakage from hurting people and has no effect on the machine itself.
The ground wire is a wire in an electrical system or electronic equipment that is connected to the earth, the shell, or the reference potential is zero. On general electrical appliances, the ground wire is connected to the shell to prevent electric shock accidents caused by the internal insulation damage of the electrical appliance and the electrification of the shell.
Ground wire is the abbreviation of grounding device. The ground wire is divided into working ground and safety ground. The protective grounding adopted to prevent people from getting electric shock when using home appliances, office and other electronic equipment is a safety grounding wire.
Extended information:
The neutral wire and the ground wire are not the same, and they are not the same concept. The neutral line is the common name for the neutral line, and the neutral line is the working line of the power supply system transformer. That is to say, for the two-phase lighting circuits used in every household, one line is called the phase line (live line), and the other line is the neutral line (neutral line).
In the process of long-distance power transmission, the higher the voltage, the lower the loss. This is why the country has been studying ultra-high voltage power transmission (I=U/R). Generally, high-voltage power is transmitted to the end customer, and then reduced to 220V/380V mains power through a transformer to supply different users. The neutral line (neutral line) is the working line where the three-phase high-voltage input transformer turns into a four-wire low-voltage supply to users.
The ground wire is divided into working grounding and safety grounding. Safety grounding can be divided into protective grounding, lightning protection grounding and electromagnetic radiation protection grounding.
1. Working grounding is the grounding wire used to complete the loop and enable the equipment to meet performance requirements. For example, the radios used by every rural household in the 1960s and 1970s had a ground wire, and the grounding point had to be frequently wetted with water. Working grounding is to bury a metal conductor copper block in the soil, and then use a wire to lead one of its points to the ground. This completes a grounding system. The grounding resistance of the ground wire is amp;le; 4Ω.
2. Protective grounding is a protective measure taken to prevent people from getting electric shock when using home appliances, office and other electronic equipment. The metal casings of household appliances and office equipment are equipped with grounding wires. If the insulation is damaged and the casing is charged, the current will leak into the earth along the installed grounding wire for safety purposes, otherwise it will cause harm to personal safety.
3. Lightning strike protection and grounding. In order to prevent tall buildings, various communication systems, various antennas and other facilities mounted on buildings from being struck by lightning during thunderstorm seasons, lightning rods need to be installed, and then Lead it with wires to the installed lightning protection grounding system.
4. Anti-electromagnetic radiation grounding In order to prevent electromagnetic interference in some important departments, shielding nets are installed on electronic equipment. The installed shielding nets must be connected to the corresponding grounding system and require grounding resistance amp;le; 4Ω.
5. Protective grounding is currently for special electronic equipment. Generally, households only have two-wire sockets and no ground wires. It is inconvenient for various electrical appliances to be protected from grounding, so some families ground the shells of household appliances. Connecting the wire to the water pipe or heating pipe is completely wrong.
Reference: Baidu Encyclopedia - Ground Wire