The red light stops, the green light goes, the yellow light is on, and so on. The signal lights of different colors represent different meanings. This is a common sense that children in kindergarten know. In the power industry, wires of different colors also represent different meanings. The following focuses on explaining which circuits different colors represent.

Black: Internal wiring of devices and equipment.

Brown: Solicitation of DC circuits.

Red: Three-phase circuit and C-phase, collector of semiconductor triode; cathode of semiconductor diode, rectifier diode or thyristor.

Yellow: Phase A of a three-phase circuit; base stage of semiconductor triode; control pole of thyristor and triac.

Green: Phase B of a three-phase circuit.

Blue: negative electrode of DC circuit; emitter of semiconductor triode; anode of semiconductor diode, rectifier diode or thyristor.

Light blue: the neutral or neutral wire of a three-phase circuit; the grounded neutral wire of a DC circuit.

White: The main electrode of the triac; a semiconductor circuit without a specified color.

Yellow and green two colors (the width of each color is about 15-100mm alternately pasted): grounding wire for safety.

Red and black in parallel: AC circuits connected by twin-core conductors or twisted-pair wires.