National color power cable color regulations

standard:

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

European standards: red (L1), yellow / white (L2), blue (L3), black (middle line), green / yellow (ground)

Standard colors in the future: brown (L1), black (L2), gray (L3), blue (middle line), green/yellow (ground)

AC three-phase circuit

Phase A: yellow; Phase B: Green; Phase C: Red; Neutral or Neutral, Light Blue;

Ground wire: yellow and green.

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

Positive electrode of DC circuit: brown; negative: blue;

Current GB7947-2006 (IDT IEC 60446-1999):

The following colors are permitted for the identification of conductors: black, brown, red, orange, yellow, green, blue, purple, gray, white, pink, and turquoise.

The use of black or brown is preferred for the AC phase conductors in the system.

A single green and yellow color is allowed only where it is less likely to be confused with protective conductor coloring.

Where a neutral or intermediate conductor is included in the circuit, blue should be used as the color identifier. Light blue is recommended to avoid confusion.

Hong Kong: (The new standard was implemented in July 1997)

Old: Three phases: red, yellow (or white), blue

Neutral line: black

Protected area: yellow green

New: Three phase: brown, black, gray

Neutral line: blue

Protected area: yellow green

AC three-phase circuit

Phase A: yellow; Phase B: Green; Phase C: Red; Neutral or Neutral, Light Blue; Grounding: Yellow and Green.

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

Positive electrode of DC circuit: brown; negative: blue;

1, according to the wire color mark circuit

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;

The base of the 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;

The anode of a semiconductor diode, rectifier diode or 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 bidirectional thyristor;

There is no specified semiconductor circuit.

Yellow and green two colors (each color is about 15~100 mm alternately attached); safe grounding 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

Phase A of the AC three-phase circuit: 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 pole of DC circuit: brown;

Negative electrode: blue;

Grounding neutral: light blue.

Collector of a semiconductor transistor of a semiconductor circuit: red;

Base: yellow;

Emitter: blue.

Anode of semiconductor diode and rectifier diode: blue;

Cathode: red.

Anode of the thyristor tube: blue;

Control pole: yellow;

Cathode: red.

Control electrode of the two-way thyristor: 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.).

In the specific color standard, if there are two or more kinds of calibratable colors on one wire, depending on the specific condition of the circuit, the color is fixed according to a certain meaning that needs to be expressed in the circuit.