What does the color above the cable mean?

2023-05-24 108

Everyone knows that several wires in a cable have different colors. What are these colors for? Let me tell you what the colors on the cable mean.

Cable sheath color specification for cable sheath color.


National standard: yellow, green, red, blue, representing A.B.C.N respectively


When circuits are identified by wire color


Black: Internal wiring of devices and equipment


Brown: Positive pole of DC circuit


Red: Three-phase circuit and C-phase




collector of a semiconductor transistor


Cathodes of semiconductor diodes, rectifier diodes or thyristors


Yellow: Phase A of a three-phase circuit


Wire and Cable


base of semiconductor transistor


Gate electrodes for thyristors and thyristors


Green: Phase B of a three-phase circuit


Blue: Negative pole of DC circuit




Emitter of a semiconductor transistor


Anode of a semiconductor diode, rectifier diode or thyristor.


Light blue: neutral or neutral for a three-phase circuit


The grounded neutral point of the DC circuit.


White: the main electrode of the triac




There is no specified semiconductor circuit.


Two colors of yellow and green (the width of each color is about 15~100mm alternately attached); safety ground wire.


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



When selecting the wire color according to the circuit.


AC three-phase circuit


Phase A: Yellow


Stage B: Green


Phase C: Red


Neutral or neutral, light blue


Safety ground wire: yellow-green


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


Positive: Brown


Negative: blue


Grounded neutral: light blue.


Semiconductor circuit of semiconductor triode


Collector: Red


base: yellow


Transmitter: blue


Semiconductor Diodes and Rectifier Diodes


Anode: blue


Cathode: red


Thyristor


Anode: blue


Lever: Yellow


Cathode: red


Triac


Lever: Yellow


Main electrode: white


Internal wiring of the entire installation is generally recommended: black


Semiconductor circuit: white


In case of confusion: Allow selection of colors other than colors. Such as: orange, purple, gray, cyan, rose, etc.