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

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.

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.

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.