What Does The Color of The Wire And Cable Mean

We all know that several lines in the cable have different colors. What are these colors used for? The following  to introduce the cable above the color is what meaning.

Specification of color of cable wire skin

National standard: yellow, green, red. Blue represents the A.B.C, respectively. N

1 When the wire color marking circuit

1.1 Black: the internal wiring of the device and equipment.

1.2 Brown: the positive electrode of the DC circuit.

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

The collector of a semiconductor triode;

A cathode of a semiconductor diode, rectifier diode, or silicon CR tube.

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

The base pole of the semiconductor triode;

Control pole of the silicone tube and the bidirectional silicone tube.

1.5 Green: phase B of the three-phase circuit.

1.6 Blue: the negative electrode of the DC circuit;

Transmitter of a semiconductor triode;

The anode of a semiconductor diode, rectifier diode, or silicon CR tube.

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

Ground center line of the DC circuit.

1.8 White: the main electrode of the bidirectional SCR tube;

Semiconductor circuit without a specified color.

1.9 Yellow and green (each color is about 15 to 100 mm wide); grounding wire for safety.

1.10 Red and black parallel: AC circuit connected with two-core wire or two-stranded wire.

2 When selecting the wire color according to the circuit

2.1 AC three-phase circuit

A phase: yellow;

Phase B: Green;

C phase: red;

Zero line or neutral line, light blue;

Ground wire for safety: yellow and green double colors.

2.2 AC circuit connected by two-core wire or two-stranded wire: red and black parallel.

2.3 Direct current circuit

Positive pole: brown;

Negative: blue;

Ground center line: light blue.

2.4 that of a semiconductor triode of a semiconductor circuit

Collector: red;

Base pole: yellow;

Emitter: blue.

Of semiconductor diodes and rectifier diodes

Anodal: blue;

The cathode: red.

Silicable tube

Anodal: blue;

Control pole: yellow;

The cathode: red.

Bidirectional CR tube

Control pole: yellow;

Main electrode: white.

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

Semiconductor circuit: white;

In case of confusion: allow to select other colors outside the specified color (such as: orange, purple, gray, green, blue, rose, red, etc.).

2.6 When the specific standard color, on a wire, if there are two or more possible standard color, depending on the specific situation of the circuit, according to the certain meaning to be expressed in the circuit.