Zero line, zero voltage to ground

The live wire is charged, and the ground wire and the zero wire are not connected. There are two sockets at home, and there are live wires and zero wires in the socket. The electric pen can detect the fire line, and the zero line is not charged. Only the ground wire is in the socket with three jacks, and the ground wire should be connected to the electrical shell to prevent electric shock casualties.

If you disassemble the socket, you can see that the point marked with L is connected to the live line, and the point marked with N is connected to the zero line. Household electricity refers to 220 volts of electricity, also known as single-phase electricity. There are two wires, a live wire and a zero wire. The live wire passes through the load, such as a light bulb, and then forms a loop through the zero line, so that the electrical appliance can work normally. The neutral line here is also grounded by the power plant. In a single-phase lighting circuit, yellow generally represents the live wire, blue represents the zero wire, and yellow and green represent the ground wire. In some places, red indicates the fire line, black indicates the zero line, and yellow and green indicates the ground line. Generally speaking, red is the fire line, blue is the zero line, and black is the ground line.

Generally, three colors of red, yellow and blue are used to represent three live wires in a three-phase circuit, and black is used to represent the zero line.

The difference between zero line and ground wire

1. Zero line and ground line are two different concepts, not the same thing.

2. The grounding potential of the grounding wire is zero. The nearest point of the electrical appliance used is grounded.

3. The ground potential of the neutral line is not necessarily zero. The nearest grounding point of the neutral line is at the substation or power supply transformer.

4. The zero line is sometimes shocking. What time? When your electric stove is not hot, don't think it is dead and won't shock people. No! There may be the possibility that the N-line is disconnected at a place far away from your appliance. If you measure with a voltmeter, you will find that the LN line of the electrical appliance is the voltage of the mains!

5. The ground wire won't electrocute people, unless the situation is bad, the designer doesn't understand it, or the product is made casually!

6. If there is a neutral wire and a ground wire in your circuit, you will find a high withstand voltage capacitor between them.