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.