Everyone knows that several wires in the cable have different colors. What are these colors used for? Let me introduce you to what the color above the cable means.

Cable skin color cable wire sheath color specification

National standard: yellow, green, red, blue, respectively, representing A.B.C.N

1 When the circuit is marked by the color of the wire

• Black: Internal wiring of devices and equipment.

• Brown: The positive pole of the DC circuit.

• Red: three-phase circuit and phase C;

           a collector of a semiconductor transistor;

           a cathode of a semiconductor diode, a rectifier diode, or a thyristor.

• Yellow: phase A of a three-phase circuit.

Wire and Cable

The base of a semiconductor transistor;

The control pole of the thyristor and the triac.

• Green: Phase B of a three-phase circuit.

• Blue: the negative pole of the DC circuit;

The emitter of a semiconductor transistor;

A semiconductor diode, a rectifier diode, or an anode of a thyristor.

• Light blue: the neutral or neutral of a three-phase circuit.

The grounding neutral of the DC circuit.

• White: the main electrode of the triac.

There is no specified semiconductor circuit.

• Yellow and green two colors (each color width is about 15~100 mm alternately attached); safety ground wire.

• Red, black parallel: AC circuit connected by double-core wire or double stranded wire.

2 When selecting the color of the wire according to the circuit

• AC three-phase circuit

         Phase A: yellow;

         Phase B: green;

         Phase C: red;

Neutral or neutral, light blue;

Safety ground wire: yellow and green.

• AC circuit connected by double-core wire or double stranded wire: red and black in parallel.

• DC circuit

Positive electrode: brown;

Negative electrode: blue;

Grounding neutral: light blue.

• Semiconductor circuits for semiconductor triodes

Collector: red;

Base: yellow;

Emitter: blue.

Semiconductor diodes and rectifier diodes

Anode: blue;

Cathode: red.

Thyristor

Anode: blue;

Control pole: yellow;

Cathode: red.

Two-way thyristor

Control pole: yellow;

Main electrode: white.

• The internal wiring of the entire device and equipment is generally recommended: black;

Semiconductor circuit: white;

When there is confusion: allow the selection of other colors outside the color (such as: orange, purple, gray, green blue, rose, etc.).