The red wire is the live wire connected to the L terminal of the socket, the blue wire is the neutral wire connected to the N terminal of the socket, and the two-color yellow and green wire is the ground. wire connected to terminal E (earth wire symbol) of the outlet. The specific position is "left zero, right light, upper ground".
According to national standards, red, yellow and green are live wires, blue is neutral wire; the ground wire is yellow and green.
The three plugs are arranged in a triangular shape, and the longest and thickest copper plug on top is the ground wire. Below are the neutral wire and the live wire. There are usually signs on the sheet. Never connect the neutral wire terminal and the ground wire terminal to position them together during use, even if there is no ground in the three-wire outlet at home or at work . , it is best to use a dry plugtor and a three-wire plug. Three-phase, five-wire system: three live wires, one ground wire, and one neutral wire. L - live wire, N - neutral wire, G - ground wire. Generally, red is the live wire, blue is the neutral wire. , and two colors are the ground wire.
Detailed information:
Connection method
1. First use a test pen to find the live wire;
2. power supply from the socket;
3. Connect the live wire to the A mark in one of the two holes of the switch, then take a 2.5MM2 insulated wire from the other hole and connect it to the L hole in the three holes of the switch. taken below. Connect it securely;
4. Find the neutral wire and connect it directly to hole N of the 3 socket holes
5. Find the ground wire and connect it directly to the outlet. Hole E among the 3 holesis firmly connected.
Note: The zero and ground wires cannot be connected incorrectly (usually the left zero and right hot wires facing the socket are connected to the ground), otherwise the electrical equipment will trip when it is turned on.
Baidu Encyclopedia-Socket
What does a single-phase three-wire system mean?
< p>Generally speaking, red represents the live wire, blue represents the neutral wire, and yellow-green represents the ground wire.
This type of socket uses 220V power supply and is wired according to the national standard, that is, the wiring method of "zero left, light right, ground agreement”. Do not connect randomly, otherwise if there is an error in the wiring, it will make it unusable later, and may also cause a safety accident.
It is convenient to distinguish the fire and earth of the socket, mainly pfor the wiring. First distinguish each white wire and mark it differently, then connect it according to fire and ground. Use a multi-purpose meter to detect which ground wire is connected to the metal shell of the electrical appliance, because this wire cannot be connected incorrectly. When connected incorrectly, it may cause tripping or even an electric shock accident. The live wire is red, the neutral wire is blue, and the ground wire is yellow-green.
Three-wire plug installation precautions:
1. Cleaning the Socket Lower Housing
Before installation, the lower housing should be cleaned normally after the woodworking and painting processes are completed. the lower case needs to be cleaned. A lot of dust will accumulate on the bottom case, so it should be cleaned first to prevent impurities in it from affecting the use of the circuit.
2. manipulation of the power cord
During the installation process, you should also pay attention to the handling of the power cord. A maintenance length must be reserved for thrown wires. Out of the box, and need to cut out the wire core, but don't damage the wire core, then tighten the pressure head on it so that it can't be exposed.
3. Fixed installation of the socket
Once everything is done, you need to carry out the installation and fixing work. Pass the section of wire reserved in the box through the exit hole. the plastic table. Plug it in, then stick the plastic table firmly to the wall and secure it to the box with screws. When finished, install the remaining wires in the corresponding positions, and finally pass them through the wire holes of the switch socket, press the wires firmly and cover them with the decorative plate.
Question 1: What aresingle-phase two-wire systems, two-phase three-wire systems, three-phase three-wire systems, and three-phase four-wire systems? Let's talk about the two-phase, three-wire system. The others are the most commonly used
The following two images are drawings of the two-phase, three-wire system. There are instructions in the industry. and Civil Design Manual
Question 2: What does "single phase" refer to in "single phase three wire socket"? In a low voltage system, single phase means one light and one zero, and the voltage value is 220 V. A single phase three wire system means one light, one zero and one ground ~
Question 3: Single phase three wire system What is the difference between this and single phase two wire system? Aren't their neutral wires live? Three-wire system: neutral wire, live wire, ground wire
Two-wire system - neutral wire, live wire
It is false that the neutral wire is absolutely discharged. We all know that the distribution part of the electrical system, the transmission line (10KV) consists of three (the most common ones we see) entering the transformer and four exiting. Among them is what we call a neutral line. conducted from the neutral point of the transformer. This line The line and one of the other three (live wires) can form a loop, which we often call 220V single phase, and two of the three (live wires) can also form a loop, but their voltage is 380V.
The neutral point of the transformer is the common point of the three live wires (star connection). Under normal circumstances, the neutral point has no potential. If the supply voltage or circuit parameters in a three-phase circuit are asymmetrical, a "midpoint shift" phenomenon will occur and there will be current inthe neutral line. The current electrical system is very stable, so there will be no current in the neutral line.
Question 4: What is a single phase three wire system? Single-phase refers to the live wire of one phase, and three-wire refers to the three wires of fire, zero, and ground. The single-phase three-wire system is generally used for 220V power wiring.
Question 5: What is a three-wire, single-phase system ----------1 live wire, 1? neutral wire + 1 ground wire Question 6: What are the differences between single-phase three-wire, three-phase four-wire, three-phase five-wire? Answer: Single phase corresponds to a voltage of 220 V
Three phase corresponds to a voltage of 380 V
Single phase with two wires------------ --1 live wire and 1 neutral wire
Single phase with three wires---------1 live wire, 1 neutral wire + 1 earth wire
Three-phase four-wire-- --------- Three-phase wires, 1 neutral wire
Three-phase five wires-------------- Three-phase wires, 1 neutral wire + 1 earth wire
< p> Supplement: Three-phase means that there are three live wires. Single phase means there is only one live wireTo put it more simply: Three phase means there is. There are three wires each of which has a voltage of 220 V. Single phase means there is only one wire which has a voltage of 220 V
Question 7: How to connect a. single phase three wire switch to single phase three wire switch. The poster above will help you analyze it.
Question 8: Single-phase three-wire system for lighting circuits The reason for using a single-phase three-wire system for lighting circuits is for electricity safety. the power supply of lighting circuits is mainly domestic electricity, it is necessary to use In order to avoid leakageFor various household appliances, the housing of the appliance is usually grounded. Therefore, one of the three lines is connected to ground. , and the other two are the main power lines, namely the live line and the zero line. Although the neutral wire is also grounded, grounding at the end of the transformer is not intended to prevent electrical leakage. The true ground wire is connected to the ground via steel bars in each building to ensure reliable grounding.
Question 9: Problems with the single-phase, three-wire system. The high voltage power line is a three-phase power supply and has no ground wire. Overhead high voltage transmission lines, such as those on iron towers, have every three lines forming a phase capture loop. Sometimes there are six or more lines on the iron tower, and several loops are erectedgees on the same tower. The two thinner wires on the top are lightning protection wires and are grounded. The electricity supplied to the residential building is low-voltage three-phase electricity, using a three-phase, four-wire system, with a grounded neutral wire at the transmission transformer. There are four wires coming from the power supply, and the thinnest is the neutral wire. Each user of the building is connected in a dispersed manner to three live lines. Specific to a certain user, it is a single-phase power supply, with a single live wire (L) and a neutral wire (N). A galvanized steel angle iron is driven into the ground near the house to obtain a ground wire (E). ) for safety protective earthing. Therefore, the indoor power supply is a single-phase, three-wire system. In production sites, where greater electrical poweraunt is required and where high power motors are widely used, three phase power supply is required. Therefore, most of what you see are 3-phase power lines, and all three are live wires (phase wires), but the AC phases on them are 120 degrees different from each other others.