​The main structure and use of the power cord

Power cords are wires that carry electricity. The general current transmission method is point-to-point transmission. Power cords can be divided into AC power cords and DC power cords according to their uses. Generally, AC power cords are wires that pass high-voltage AC power. Because of the high voltage, this type of wire requires uniform standards to obtain safety certification before it can be formally produced. The DC line basically passes DC with a lower voltage, so the safety requirements are not as strict as the AC line, but for safety reasons, countries still require unified safety certification.

The structure of the power cord:

The structure of the power cord mainly includes an outer sheath, an inner sheath, and a conductor. Common transmission conductors include copper and aluminum wires.

Outer sheath: Also known as maintenance sheath, it is a layer of sheath outside the power cord Z. This outer sheath plays the role of protecting the power cord. The outer sheath has strong characteristics, such as high temperature resistance and low temperature resistance , Anti-natural light interference, good winding performance, long service life, and environmentally friendly materials.

Inner sheath: Also known as insulating sheath, it is an indispensable part of the power cord. The main function of the insulating sheath is insulation, as the name implies, to ensure the safety of the power cord, so that there will be no leakage between the copper wire and the air. phenomenon, and the material of the insulating sheath should be soft to ensure that it can be well embedded in the middle layer.

Copper wire: It is the central part of the power cord. The copper wire is mainly the carrier of current and voltage. The density of the copper wire directly affects the quality of the power cord. The material of the power cord is also an important factor in quality control, and the quantity and flexibility of copper wire are also one of the factors considered.

Inner sheath: It is a layer of material that wraps the cable between the shielding layer and the core. It is usually polyvinyl chloride plastic or polyethylene plastic, and there are also low-smoke and halogen-free materials. Use according to the process rules, so that the insulating layer will not be in contact with water, air or other objects, and prevent the insulation from being damp and the insulating layer from mechanical damage.

Purpose of the power cord:

Although the power cord is only an accessory for home appliances, it plays a vital role in the use of home appliances. If the power cord is broken, the entire appliance will not work. Household power cords should use BVV2×2.5 and BVV2×1.5 wires. BVV is the national standard code, which is a copper sheathed wire. 2×2.5 and 2×1.5 represent 2-core 2.5 square millimeters and 2-core 1.5 square millimeters respectively. Under normal circumstances, 2×2.5 is used as the main line and trunk line, and 2×1.5 is used as a single electrical branch line and switch line. BVV2 × 4 is used for single-phase air-conditioning dedicated line, and a dedicated ground wire is also provided.