Why don t you switch the neutral and ground wires

When the zero line does not go to the switch, because of safety considerations, the switch of household lighting electricity is connected to the live wire, because the voltage of the live wire to the ground is 220V, and the zero line has no voltage to the ground, if the switch is connected between the lamp and the zero line, so that the lamp has voltage on the side of the live wire, even if the switch is disconnected, people touch the lamp, it is possible to be electrocuted, and between the live wire and the lamp, the switch is disconnected, there is no voltage at both ends of the lamp, and people will not be electrocuted if they touch it casually;

As for the ground wire, the function is to connect the electrical equipment shell and the earth, once the equipment shell is electrified, the electricity returns to the earth, plays a protective role, the ground wire can not be connected to the switch at any time, if the access switch, once the switch is disconnected, the ground wire and the earth will be disconnected, and it can not play a protective role.

As long as the switch is used to break the wire, the power supply and the load cannot form a loop, and the light will not turn on. If both the live wire and the neutral wire are connected to the switch control, it is fine, but it will cause waste.

Big brother, it's going to be short-circuited, it's going to burn the insurance

In the absence of a line of fire, the human body will not be electrocuted if it touches them. Switches equals waste. The switch is disconnected from the live wire, and the power is out.

Like we use electricity, we only need to control the live wire, in which the neutral wire and the ground wire are not charged, may I ask the non-charged things, do we want to control? Besides, the function of the ground wire is to prevent the equipment shell from being electrified, if you use the switch like this, we will not be electrocuted if it is not turned on.

The ground wire and the zero wire are not interchangeable. You can change the position of the neutral line and the ground wire.

1. The switch does not need a neutral line, the function of the switch is to disconnect or turn on the circuit at a certain point in the closed circuit, and the general switch has only two binding posts (one in and one out), and both control the live wire.

2. The switch can not control the zero line, if the control of the zero line, after the circuit is disconnected, there is still a voltage on the electrical appliance, which will bring inconvenience and danger to the use and maintenance.

Categories: Education, Science, >> Science & Technology.

Problem description: I read that the textbook says that there is an additional grounding wire for 3 sockets, but I don't understand that the neutral wire has been grounded, so why do you need a grounding wire?

Analysis: Then let me put it simply: the neutral line is to make the wire uncharged.

The ground wire is to keep the appliance uncharged.

The three ends of the three-phase electricity are called phase wires, and the three tails of the three-phase electricity are connected together to call the neutral wire"Zero line"。The reason why it is called the neutral line is that there is no current passing through the neutral line at the time of three-phase equilibrium, and then it is directly or indirectly connected to the earth, and the voltage with the earth is close to zero.

The ground wire is a line that reliably connects the shell of equipment or electrical appliances to the earth, and is a good solution to prevent electric shock accidents.

In general, in a three-phase circuit, the live wire uses three colors of red, yellow, and blue to represent the three live wires, and the neutral wire uses black. In single-phase lighting circuits, yellow is generally the live wire, blue is the neutral wire, and yellow and green is the ground wire. In some places, red is used for the live wire, black for the neutral line, and yellow and green for the ground wire.

Electrical appliances have a neutral line and a live wire, thus forming a path, so that the electrical appliances have current through and play a role, and when the switch is turned off, the neutral line is not charged.

The ground wire is not charged regardless of whether the switch is turned off or not, and its main function is the grounding you mentioned. In order to avoid the occurrence of leakage accidents or the harm that strong electric potential may cause to people, high-power electrical appliances have a grounding wire, which can lead the excess current or strong electric potential generated to the ground through the ground wire.

If the ground cable is not properly connected, it cannot operate normally, and it is a setting that exists for the safety of users.