How To Distinguish The Purpose And Function Of A Wire By The Wire Color (2)
II. When selecting the wire color according to the circuit
1. AC three-phase circuit
Phase A: Yellow; Phase B: Green; Phase C: Red; Neutral or Neutral: Light Blue; Safety Ground: Yellow and Green.
2. AC circuits connected with twin wires or double strands: red and black in parallel.
3. DC circuits
Positive: Brown; Negative: Blue; Grounded neutral: Light blue.
4. semiconductor circuits
The collector of the semiconductor transistor: red; base: yellow; emitter: blue.
The anode of the semiconductor diode and rectifier diode: blue; cathode: red.
SCR anode: blue; control electrode: yellow; cathode: red.
The control electrode of the triac is yellow: the main electrode is white.
5. Internal wiring of the entire device and equipment
General Recommendation: Black; Semiconductor Circuit: White;
When there is confusion: It is permissible to select colors other than the specified color (eg, orange, purple, gray, green-blue, rose-red, etc.).
6. when the specific color
On a wire, if there are two or more than two colors that can be color-coded, depending on the specific conditions of the circuit, the color is fixed according to a certain meaning that needs to be expressed in the circuit.
Attachement: World standard for three-phase wire color requirements