Wire and cable color and number

The number of cable and wire represents the specification and model of cable and wire. The number of each cable letter has a special meaning. When we look at the specification of cable and wire, we must clearly see the number of cable specification and model. The main reason why the wires should be colored is for the safety of electricity use, to avoid the wrong connection when wiring, so that we can better distinguish the position of each line, reduce the probability of misoperation, and improve the safety of wiring. At the same time, it is also to facilitate the future circuit maintenance of each family, so that the maintenance personnel can find the fault location in a short time, so as to repair in time.

Color differentiation of wires and cables

The color of the wires is black, white, green, red, blue, orange, brown and gray. The color of the insulation sheath outside the wires usually has its own meaning; The blue line represents the zero line, the yellow, green and red lines usually represent the u, v and w phases of the three-phase line, namely the live line, and the yellow and green two-color line represents the protective grounding wire. In addition, white is rarely used, and black is used for connecting wires in electrical equipment boxes and cabinets. Red is the live line, blue is the zero line, and yellow or yellow and white are the most common ground wires; Yellow, green and red represent phase lines. It can also be said that the fire wire is charged. Blue represents working zero, which can also be called zero line. This line is usually not electrified, but sometimes it is electrified. That is, when the zero line is broken, this line will be electrified. The double color represents the ground wire. This line is the safest. The role of this line is to electrify people after the zero line is broken and help the leakage trip.

Meaning of wire color letters

The wire is used for the connection of three-phase AC system, which is distinguished by phase A - yellow (Y or YE), phase B - green (G or GN) and phase C - red (R or RD), for the neutral line N - light blue (B or BU), and for the protective line PE - yellow and green (Y/G or YE/GN, or Y&G, YE&GN). Wire for DC system, positive+- brown (BN), negative - - blue (BU), DC intermediate point wire light blue (BU), electrical complete set wiring, usually black (BK), thyristor trigger wire - red and white twisted pair, red (RD) trigger pole, white (WH) cathode