What do the labels on the back of the socket mean?

What do the labels on the back of the socket mean? We usually have sockets in our homes. Some people will see the labels on the back of the socket when they observe it. Many people don't know what this means. Let me tell you what the labels on the back of the socket mean. What do the labels L and N on the back of the socket mean? 1

L stands for live wire socket and N stands for neutral wire socket. The electrical phase sequence is left zero and right fire grounding (when there are three holes).

the live wire and the neutral wire are generally connected according to the label, but they can be used in reverse. Only the switching appliances that are turned off will also be charged, and the safety is poor. However, the ground wire must not be connected wrongly. Now the ground wire of the line is generally not connected, but remember not to connect the ground wire to the live wire or the neutral wire!

most of the power sockets we use are single-phase three-wire sockets or single-phase two-wire sockets. In the single-phase three-wire socket, the ground wire is in the middle, which is also used for positioning, and the other two ends are connected with live wire and zero wire respectively. The wiring sequence is left zero and right fire, that is, the left zero wire and the right live wire. All household appliances with metal shells adopt single-phase three-wire power plugs. The three plugs are arranged in an orthorhombic shape, and the longest and thickest copper plug on the top is the ground wire. The two below the ground wire are the live wire (marked with the letter "L"Live Wire) and the zero wire (marked with the letter" N"Naught wire), and the order is left zero and right fire (when the back of the plug is facing yourself).

the ground wire is short-circuited with the earth through the deeply buried electrode. The transmission of commercial power is in three-phase mode, and there is a neutral wire. When the three-phase is balanced, the current of the neutral wire is zero, commonly known as the "neutral wire". Another feature of the neutral wire is that it is short-circuited with the ground wire at the total power distribution input of the system, and the voltage difference is close to zero. There are 22 voltages between the three phase lines and the neutral line of three-phase electricity, which will cause electric shock to people, commonly known as "live wire".

red or brown wire is used for the live wire (the sign letter is "L"Live Wire)

zero wire (the sign letter is" N"Naught wire) and blue or white wire

ground wire (the sign letter is "E"Earth). Use yellow and green wires. What do the labels L and N on the back of the socket mean? 2

What will happen if you don't pay attention to connecting the reverse live wire and the zero wire?

1. If it is a single-phase device that doesn't need grounding protection, such as a two-eye socket, the order of L and N doesn't matter much, but generally for safety reasons, we'd better connect the wires according to the labels L and N.

second, if it is a single-phase device that needs grounding protection, such as a three-eye socket, the order of L and N cannot be reversed. If it is connected backwards, the shell of the device is equivalent to the live wire, which will have great security risks.

Therefore, the standard wiring requires us to recognize the zero line, live line and ground wire. Generally speaking, the hole above the three hole socket is grounded, while the two holes below follow the principle of "left zero and right fire".

Although color can help us distinguish the types of lines well, if an irresponsible electrician wants to be lazy and use the same color to represent all lines, will it be a big problem in an instant? Don't worry, here are some tips to help you distinguish.

first, find out the live wire

and then test it with an electric pen. If it lights up, it means live wire, so mark it first, and the remaining two are zero wire or ground wire.

2. Distinguish between neutral wire and ground wire

1. Use a multimeter to distinguish. Insert the black probe into the black hole, and the red probe into the red hole. The range of the resistor is 75 ohms.

2. After electrifying, first reset the multimeter to zero, insert the black stylus into the live wire hole and the red stylus into the other two holes. If the values measured twice are about 22, the higher value is the zero line and the lower value is the ground line.

The distinction between the three wires on the socket is actually very simple. Only two simple tools are needed, but improper operation will lead to danger. We'd better ask a professional electrician to test it, which will be safer.