I think we are not strange when we talk about the ground wire. We also know that the ground wire is to protect our personal safety, but many times we don't care about the ground wire when wiring, because the ground wire itself has no electricity, let People feel that the ground line seems to be useless. Indeed, the ground line has no substantive effect on the electrical appliances, but it always protects our lives.
Today, combined with my own experience, and check some information for everyone to analyze, why the ground line is so important.
The ground wire, commonly known as the lightning protection line, is a wire used to introduce the current in the wire into the earth. When the electrical appliance is in an accident, the resistance of the wire is far lower than the body resistance, so the ground wire can lead the current to the earth to protect people. Security.
We know that today's electrical appliances have many electrical appliances whose outer casings are made of metal, such as water boilers, electric cookers, etc., and the metal is a conductor, and the resistance is very low, so when we use it, it is inevitable to touch these metals. In the event of electric leakage, and the electrical equipment is not grounded, this is very dangerous.
There is also an electrical appliance that needs to be grounded, that is, high-power electrical appliances. Because the current of the high-power electrical appliance is relatively large, the internal may be in a high-voltage state. If it is not grounded, it is very dangerous. There is also a lot of contact with us, that is, the motor is included. Electrical appliances, such as washing machines, refrigerators, air conditioners, etc., are commonly used in home appliances. Because the motor is in vibration during work, it is very likely that some of the lines will fall off after a long period of vibration, if someone accidentally touches the wire. It may also be life-threatening, so the ground wire is usually connected to these appliances.
Of course, we have always said that the electrical connection to the electrical line, of course, does not mean to add a ground wire to the earth itself, here we are connected to the socket through the plug, the socket is connected to the earth through the wire, our common ground wire The socket may be the one of the three jacks. On the three jacks, the one above the middle is the ground line, which is the one that is connected to the yellow line in the above figure.
In addition, there is an electrical appliance that also has a ground wire, but its characteristics are somewhat different from the above three methods, that is, the computer is neither a high-powered electrical appliance nor a metal casing and does not contain a really strong motor inside. Power motor, the vibration amplitude is very small), because the computer we usually use frequently, and close contact, there is a very important reason, the computer's power supply is a high-frequency switching power supply, which will bring strong induction power to the metal casing. Because the computer needs to prevent interference, it is better to use a metal casing with electromagnetic shielding function, but it is generally added internally, but it is better to be grounded for safety.
In general, most of the electrical appliances that we are exposed to need to be grounded. That is to say, most electrical appliances have the possibility of leakage. It can be seen how much the wires work, so when we next connect the sockets, Don't forget the grounding wire during the renovation . For the safety of the family's electricity, it will be troublesome and safe.
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