This article introduces the method of distinguishing the use and function of the wire through the color of the wire, so that the electrician wiring, find the line more efficient, clearer thinking!
Black, white, green, red, blue, orange, brown and gray, the outside of the wire insulation sheath color usually has its own meaning. If the standard wiring and wiring of the instrument or electrical cabinet, use this article to introduce the color of the wire to find the line method can be half the effort. But the random use of wire wiring cabinet, this method may not be effective.
01 Marking circuits based on wire color
①Black wires are used for the internal wiring of devices and equipment.
②The brown wire is used for the positive terminal of the DC circuit
③ red wire for the C-phase of a three-phase circuit; the collector of a semiconductor triode; the cathode of a semiconductor diode, rectifier diode or thyristor
④The yellow wire is used for the A-phase of the three-phase circuit; the base of the semiconductor triode; and the control poles of the thyristor and the thyristor
⑤ The green wire is used for phase B of the three-phase circuit.
⑥The blue wire is used for the negative terminal of a DC circuit; the emitter of a semiconductor triode; and the anode of a semiconductor diode, rectifier diode or thyristor.
⑦The light blue wire is used for the zero or neutral wire of a three-phase circuit; the grounded neutral wire of a DC circuit.
⑧White wire is used for the main electrode of the thyristor; semiconductor circuits without specified color.
⑨ yellow and green two-color wire for (each color is about 15-100 mm wide alternately affixed) grounding wire for safety.
⑩Red and black parallel are used for AC circuits connected using two-core conductors or two stranded wires.
02 When choosing the wire color according to the circuit
① AC three-phase circuit
Phase A: yellow; Phase B: green; Phase C: red; zero or neutral wire: light blue; ground wire for safety: yellow and green double color.
② AC circuits connected with two-core wires or two stranded wires: red and black in parallel.
③DC circuit
Positive: brown; negative: blue; grounded center line: light blue.
④Semiconductor circuit
The collector of semiconductor triode: red; base: yellow; emitter: blue.
Anode of semiconductor diode and rectifier diode: blue; cathode: red
Anode of thyristor: blue; control electrode: yellow; cathode: red.
Control electrode of bi-directional SCR: yellow; main electrode: white.
⑤ Internal wiring of the entire device and equipment
General recommendation: black; semiconductor circuits: white.
When there is confusion: other colors than the specified color are allowed to be selected (e.g., orange, purple, gray, green-blue, rose red, etc.).
(6) when the specific color marking
In a wire, if there are two or more markable colors, depending on the specific circumstances of the circuit, according to the circuit needs to indicate a certain meaning of the color.
