Everyone knows that several wires in the cable have different colors. What are these colors used for? The following is the network editor of Tongqiao Electric Co., Ltd. to tell you what the colors on the cables mean.

　　The color of the outer skin of the cable

　　National standard: yellow, green, red. Blue represents ABCN respectively

　　1 When marking the circuit according to the wire color

　　1.1 Black: Internal wiring of devices and equipment.

　　1.2 Brown: The positive pole of the DC circuit.

　　1.3 Red: three-phase circuit and C-phase;

　　The collector of a semiconductor transistor;

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

　　1.4 Yellow: Phase A of the three-phase circuit;

　　The base of the semiconductor transistor;

　　Control electrode of thyristor and triac.

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

　　1.6 Blue: the negative pole of the DC circuit;

　　The emitter of a semiconductor transistor;

　　The anode of a semiconductor diode, rectifier diode, or thyristor.

　　1.7 Light blue: the zero or neutral line of the three-phase circuit;

　　The grounded neutral of the DC circuit.

　　1.8 White: the main electrode of the triac;

　　Semiconductor circuits without designated colors.

　　1.9 Two colors of yellow and green (the width of each color is about 15~100 mm alternately attached); a safety grounding wire.

　　1.10 Red and black parallel: AC circuits connected by two-core wires or twisted-pair wires.

　　2 When selecting the wire color according to the circuit

　　2.1 AC three-phase circuit

　　Phase A: yellow;

　　Phase B: Green;

　　Phase C: red;

　　Zero line or neutral line, light blue;

　　Safety grounding wire: yellow and green double colors.

　　2.2 AC circuits connected by two-core wires or twisted-pair wires: red and black in parallel.

　　2.3 of the DC circuit

　　Positive electrode: brown;

　　Negative electrode: blue;

　　Grounding neutral line: light blue.

　　2.4 The semiconductor triode of the semiconductor circuit

　　Collector: red;

　　Base: yellow;

　　Emitter: blue.

　　Semiconductor diodes and rectifier diodes

　　Anode: blue;

　　Cathode: red.

　　Thyristor

　　Anode: blue;

　　Control pole: yellow;

　　Cathode: red.

　　Triac

　　Control pole: yellow;

　　Main electrode: white.

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

　　Semiconductor circuit: white;

　　When there is confusion: other colors (such as orange, purple, gray, green blue, rose red, etc.) other than the specified colors are allowed.

　　2.6 In the specific color marking, if there are two or more colors that can be marked on a wire, the color shall be fixed according to a certain meaning that needs to be expressed in the circuit, depending on the specific situation of the circuit.