I have repeatedly stressed that no matter what the circumstances should be based on safety, perhaps you are skilled in electrician, no matter which line you pick up, but no one will be careless, so as an electrician, we must minimize the risk factor. .
In the normal situation of the electrical equipment, the ground wire is absolutely powerless. Under normal circumstances, the resistance of the ground wire of the three wires is also the smallest. When the electrical appliance is damaged by the internal insulation, the live wire is damaged or the live wire accidentally hits the metal of the power distribution cabinet. Because the ground wire resistance is small, the human body resistance is large, most of the current will flow through the ground wire to reduce the damage of the current to our body. Sometimes the ground wire is also called the lifeline, so we must first connect the ground wire.
When the line is not loaded, when the human body is not in contact with any conductor, touching the neutral line by hand does not feel the presence of electricity. Because the neutral line is equipotential under normal conditions, that is, it is not charged. Therefore, we will pick up the ground wire after connecting the ground wire at this time, because if the fire wire is connected first, the fire wire will be charged through the load circuit at the unconnected zero line. At this time, the zero wire is equivalent to the fire wire, and the live wire is again contacted. The line risk factor increases.
When the ground wire and the neutral wire are connected, the interface is also processed. At this time, we can connect the fire wire. At this time, even if it accidentally touches the fire wire terminal, it will take away most of the wire because of the neutral wire. Current, reducing damage to the body. From this we can also summarize the grounding line when wiring, and then connect the zero line, and finally connect the most dangerous fire line, the reverse of the line.
It should be pointed out that whether it is live or unpowered, it must be wired in the above order. Regardless of whether the connected wire is charged or not, we should not touch it directly with the hand. No matter what the wire is, it should be charged. There are insulated gloves or insulated shoes, but low-voltage electricians, especially indoors, believe that not many electricians will wear them. Some factories do not have matching equipment. They are all in the hands.
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