Several lines inside the cable have different colors. What are the uses of these colors?
Cable skin color cable wire sheath color specification
National standards: yellow for A, green for B, red for C. blue for N.
When the circuit is marked by the color of the wire
Black: Internal wiring of devices and equipment.
Black cable: Internal wiring of devices and equipment.
Brown cable: The positive pole of the DC circuit.
Red cable: 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 cable: phase A of a three-phase circuit.
The base of a semiconductor transistor.
The control pole of the thyristor and the triac.
Green cable: Phase B of a three-phase circuit.
Blue cable: 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 cable: neutral or neutral of a three-phase circuit.
The grounding neutral of the DC circuit.
White cable: the main electrode of the triac.
There is no specified semiconductor circuit.
Yellow and green two-color (each color is about 15~100 mm alternately attached) cable: safety ground wire.
Red and black cables: AC circuits connected by double-core wires or double-stranded wires.
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.).
In the specific color standard, if there are two or more kinds of calibratable colors on one wire, depending on the specific conditions of the circuit, the color shall be fixed according to a certain meaning that needs to be expressed in the circuit.
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