What do the red, yellow and green wires mean?

- Nov 21, 2018 -

1, according to the wire color marking circuit

Black - internal wiring of devices and equipment.

Brown - the positive pole of the DC circuit.

Red - phase C of a three-phase circuit;

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 grounded neutral of a DC circuit.


The main electrode of the triac; no semiconductor circuit of the specified color.

Yellow and green two colors (each color is about 15 to 100 mm alternately attached) - a safe grounding wire.

Red and black parallel—AC circuits connected by two-core wires or two twisted wires.


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