In daily life, whether it is home improvement or tooling, wires are commodities that people often use and pay attention to, but do you know what each type of different color wire represents?

Wire color meaning

☞ black

Internal wiring of devices and equipment.

☞ Brown

The positive pole of the DC circuit.

☞ red

Three-phase circuit and C-phase;

The collector of a semiconductor transistor;

The cathode of a semiconductor diode, rectifier diode, or thyristor.

☞ yellow

Phase A of the three-phase circuit;

The base of a semiconductor transistor;

Control electrode of thyristor and 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 line of a three-phase circuit;

The grounded neutral of the DC circuit.

☞ white

The main electrode of the triac;

Semiconductor circuits without designated colors.

☞ Yellow and green color

(The width of each color is about 15～100mm alternately attached)

Grounding wire for safety.

☞ Red and black parallel

An AC circuit connected with two-core wires or twisted-pair wires.

▍Choose different color wires according to the circuit:

1. Three-phase AC circuit:

Phase A: Yellow

Phase B: Green

Phase C: Red

Neutral or neutral line: blue

Protective grounding wire: yellow and green color.

2. In single-phase circuit:

FireWire: Red

Zero line: blue

3. AC circuit connected with two-core wire or twisted pair:

Red and black parallel

4. DC circuit:

Positive electrode: brown

Negative electrode: blue

Grounding wire: blue.

5. The internal wiring of the entire device and equipment is generally recommended:

black.

▍Comparison of the advantages and disadvantages of soft and hard wires

★ From the appearance of wires

Flexible wire, also called sheath wire, is generally a wire made of multiple strands of copper wire with a diameter of less than 1mm. The hard wire is a relatively thick single-stranded metal wire, generally directly above 1mm.

★ From the perspective of the nature of the wire

The thread of the cord is relatively thin and soft, which is convenient for turning and passing through the tube. But it is easy to age over time, which affects the service life of the entire circuit.

In essence, the hard wire has a relatively small cross-section and can withstand the impact of short-circuit current, and the hard wire is not easy to oxidize, and its life is relatively longer than that of the soft wire. However, the hard wire itself is hard to deal with when turning through the pipe.

☞ Whether the flexible cord is easy to use or hard cord for home improvement has a longer life

Each copper wire of the flexible wire is relatively thin, which is easy to be damaged and broken during installation, thereby affecting the electrical conductivity of the wire. On the contrary, the hard wire will not be affected by the construction process, and it is much better in reliability and durability.

If the architectural space shapes the body of life, then the wire is the soul responsible for activating the body.