What is the structure of the power cord today

We use the power cord every day, but we don't know the process. Nowadays, the power cord is relatively strict. The power cord is used every day in production and everywhere in life. The computer refrigerator air conditioning fan and so on
After a long time of refining, the power cord technology has matured, but you know what kind of safety standards they need to go through before they can be used by us. Now I will give you science popularization.
1. Copper aluminum single wire drawing of power line
The copper and aluminum materials commonly used for power lines can be reduced in cross section, added in length and improved in strength by using a wire drawing machine through one or several die holes of the drawing die at normal temperature. Wire drawing is the first process of all wire and cable companies, and the primary process parameter of wire drawing is the die matching technology.
2. Annealing of single wire of power line
In order to increase the toughness of the single wire, copper and aluminum will be heated to a certain temperature, and the strength of the material will be reduced before drawing. In line with the requirements of wire and cable production, the annealing process is to follow the oxidation of the copper wire.
3. Twisting of power line conductor
In order to increase flexibility and facilitate binding and installation, the power cord core will be twisted and made of multiple single wires. From the way of twisting the power cord core, it can be divided into regular check, irregular twist, powder bundle twist, concentric re-twist, special re-twist and other ways. This is to reduce the occupied area of the power cord and reduce the geometric size of the power cord. In addition, the way of tight compression is also used to make the conductors and conductors connected.
This kind of conductor is used in power lines.
4. Outer sheath of power line
The outer sheath is designed to prevent the insulation layer of the power line from corroding the structure. The primary effect of the outer sheath is to further strengthen the strength of the power line to cope with various conditions and harsh environmental radiation and chemical erosion, and to prevent the power line from burning due to moisture-proof and waterproof. It is made according to the requirements of the power line.