Wire and cable color line

There are many colors in wires and cables, and different colors also represent different meanings. In the daily household electricity, 1. Generally speaking, we will use red to represent the line of fire and the letter l to represent it. Red itself is a dazzling color. When you see it, you will feel nervous and can also serve as a warning. Generally, red or brown wires are electrified. 2. There are also blue or black lines. Generally speaking, this line is the zero line, which is usually referred to as the neutral line. It is represented by the letter n. In some cases, light blue will also be used to represent the zero line, and the lines of these colors are generally not charged, but it cannot be ruled out. 3. There are also green or yellow-green wires. Generally speaking, they represent ground wires, called insulated conductors, which play a protective role. Therefore, it is generally safer to meet the line of this color. Its main function is that when the zero line is broken, the zero line will be electrified, and the ground wire can prevent the zero line from electrification, and can also trip the leakage protector in case of leakage. The ground wire also has a provision that it cannot be used as a phase line under any circumstances.

Why do wires and cables have different colors

The color standard of wires and cables is very strict. For example, the yellow and green bicolor wires cannot be replaced by the type of wires. For the wires used in DC, the positive pole must use red wires, and the negative pole must use black wires. The main reason why wires and cables should be colored is to use electricity safely and avoid wrong connection during wiring, so that we can better distinguish the position of each line and reduce the probability of wrong operation. Improve the safety of wiring.

Color regulation of wires and cables

According to the national regulations, the voltage (i.e. line voltage) between the phase lines of the civil power supply line is 380v, and the voltage (i.e. phase voltage) between the phase line and the ground line or between the neutral line is 220v. Generally, the one-way three-wire system is adopted for the incoming line, that is, one of the three phase lines and the neutral line (as the neutral line) and the ground line. In the national standard, the standard conductor colors of three-phase five-wire system are: A line yellow, B line green, C line red, N line blue, PE line yellow-green. The regulations on color identification of grade insulation layer in the cable specification stipulated by the state: the color of three-phase voltage is yellow plus green plus red plus blue plus yellow and green. Generally, the manufacturer complies with the national regulations. The standard conductor colors of three-phase five-core cables are: yellow for line A, green for line B, red for line C, blue for line N, and yellow and green for line PE.