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The most common type of socket is a five-hole product. The bottom box will have holes for connecting wires. The red hot wire marked with L, and the blue zero wire marked with N. There will be a grounding hole between the L and N poles. Ground wire. 
After the socket is installed and hidden in the wall, it will not be opened for acceptance. However, according to the miserable life experiences of some netizens, there was once “no wiring†at the rear (because the appliance could not be used after it was plugged in. At the end of the socket, it was found that there was no wiring at all. This is really too angry); there are also ungrounded wires. , this is also a sign of electric shock was discovered; 
The more common is not to comply with the specified color line, the rear of the socket is full of red or blue and black lines, resulting in maintenance do not know what line is what line what role. 
Usually, the socket on the back of the socket has the position of the specified neutral line, fire wire, or ground wire. It should be noted that the current resistance of a typical five-hole socket is 10A. The whole home wire is preferably a hot red line and a blue neutral line. 
Therefore, it is better to have the owner go to the site for inspection when the hydropower is being built. Because the socket is still not fixed at that time, you can take a good look at the wiring behind the situation, check the supervision. 
In order to avoid the above situations, the main thing is to rely on the owners to polish their eyes and learn more about the decoration and acceptance of common sense. There is the need to choose a professional construction personnel with good professional integrity, do not casually look for those who decorate the guerrillas for construction, it is too unsafe. 
These are some common senses and suggestions that Xiao Bian has introduced to you based on real-life decoration errors. I hope that I can help everyone.
The socket has forgotten to pick up this line, but it actually has to be re-routed
Recently, I heard a friend say something more funny - it was clear that the family had just completed the renovation but they had to re-pull the wire and take the line. The reason turned out to be that the dark line had been burned out. The decoration guerrillas that they were looking for were not able to contact them. They had no choice but to find another way to re-wiring the way the master used the bright line. Is it a tragedy to hear it? Xiao Bian thinks that we must talk to everyone today about some problems with our home electrical outlets.