My home is under renovation. Today, when I looked at it, I found that the electrician in the three-hole socket did not wear the grounding wire and wore the live and neutral wires. I asked him why he didn't wear it. He said that he had been an electrician for twenty or thirty years, working in others, and the grounding wire was never worn. I wondered. As far as I know, in order to prevent leakage, I should pick it up. Why did he tell me so sure?
I have asked a lot of friends and some insiders to hold the ground wire of the socket at home. The explanation they gave me was this:
The grounding wire is the protective grounding. Ground the electrical equipment casing. If the electrical equipment leaks, because the outer casing is grounded, the potential of the outer casing is equal to that of the earth. No current is passed, which is safe for the human body.
In the power system, there are clear provisions for zero-connection protection and grounding protection. The principle of zero-connection protection is that the electrical faults of the electrical fault increase the protection relay to cut off the power supply, which is generally used in the three-phase three-wire system.
The grounding protection is Y on the secondary side of the transformer. In the system (three-phase four-wire system), the neutral line is connected to the ground. When the electrical fault is charged, the charge flows into the earth to protect the human body and the equipment, and does not shift the neutral point to ensure that the three-phase voltages are stable. In addition, a single system is never allowed to have two kinds of grounding or zero-zero protection at the same time, and the consequences are quite serious.
That is to say, the neutral line of the generator should be connected with the ground line, and the transformer operating system is the same. If the ground line and the neutral line are not connected together, the leakage protector does not work, and leakage is required. The tester measures, do not press the leakage protector test button jump to think it works.
For future safety, the three-hole socket must be grounded as the leakage protection of the electrical enclosure. It must be connected. In order to prevent the grounding wire from breaking, it is sometimes necessary to repeat the grounding to ensure absolute safety.
A master who made the decoration strongly said that if my electrician really has more than ten years of experience, then I should know the specifications. Now the lights below 2.4 meters require a ground wire, let alone the socket! If there is no ground wire, the case will have a strong induction when using a microwave oven. Very unsafe! So he suspected that my electrician might be a soil electrician, mixed money, and suggested that I quickly dismiss him!
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