The VV cable is a PVC insulated and sheathed copper core power cable specially designed for fixed wiring, featuring 3 - core specifications, including two core models: 3X1.5mm² and 3X2.5mm². It is widely used in fixed laying scenarios of construction, industrial facilities and civil power systems. Its core advantage lies in the scientific combination of copper conductors and PVC materials, which not only ensures the stability of power transmission, but also has practicality to adapt to various environments. In terms of structural design, the cable adopts a three - layer structure of "copper conductor + PVC insulation layer + total PVC sheath". The conductor is made of high - purity electrolytic copper with a conductivity of ≥97%. The diameter of a single wire is accurately controlled at 0.15 - 0.25mm, and it is made by multi - strand stranding technology. This not only improves flexibility, facilitating laying in fixed scenarios such as walls and pipes, but also reduces energy loss caused by the skin effect. Both the insulation layer and the sheath are made of temperature - resistant PVC materials. The thickness of the insulation layer is 0.6 - 0.8mm, and the thickness of the sheath is 1.0 - 1.2mm. It has good acid and alkali resistance and anti - aging performance, and can work stably for a long time in an environment of - 15℃ to 60℃. Moreover, the insulation resistance is ≥100MΩ, which can effectively prevent the risk of electric leakage. From the perspective of specification adaptability, the 3X1.5mm² model is suitable for small - sized fixed wiring scenarios, such as household lighting circuits, power supply lines of small household appliances and power connections of office equipment. Its rated current - carrying capacity is 16 - 20A, which can meet the daily low - power electricity demand; The 3X2.5mm² model is suitable for medium - power fixed wiring, such as residential socket circuits, power supply of small motors and lighting main lines in commercial places. Its rated current - carrying capacity reaches 25 - 32A, which can bear the electricity load of high - power appliances such as air conditioners and electric water heaters. Both models have passed the national standard GB/T 12706 certification, and the insulation withstand voltage reaches 3.5kV/5min, ensuring electrical safety in long - term use. In terms of installation and durability, the PVC sheath of the VV cable has a certain mechanical strength, with a tensile strength of ≥12MPa and an elongation at break of ≥150%. It can withstand slight friction and extrusion during laying, and also has certain flame retardant performance (in line with GB/T 18380 flame retardant standards), reducing fire hazards. Its fixed wiring characteristic makes it suitable for underground laying, pipe laying or wall - mounted laying, without frequent movement, reducing the probability of faults caused by mechanical damage. In addition, the outer skin of the cable is printed with clear specification marks and meter scales, which is convenient for quick identification and cutting during construction, improving installation efficiency. In general, with reliable conductivity, stable insulation protection and specification design suitable for various scenarios, the VV cable has become a cost - effective choice in the field of fixed wiring, providing safe and long - lasting protection for power transmission in households, commerce and industry.