This summary introduces a 4-core copper flexible power cable made in China, with core specifications covering various cross-sectional areas such as 25mm², 35mm², 70mm², and 240mm². Designed with YJVR and VVR models, it features a PVC insulation layer, offering flexible characteristics and reliable power transmission performance, widely applicable to various industrial, construction, and civil power systems. The cable uses high-purity copper as the conductor material, which has excellent electrical conductivity, effectively reducing losses during current transmission and ensuring efficient and stable power delivery. The 4-core design enables it to meet the transmission needs of phase lines, neutral lines, and ground lines simultaneously, making it suitable for common circuit systems such as three-phase four-wire systems, enhancing the safety and stability of the circuit. In terms of specifications, the cross-sectional areas of 25mm², 35mm², 70mm², and 240mm² cover power transmission scenarios from medium-low to high power. Among them, small cross-sectional specifications (25mm², 35mm²) are suitable for low-load scenarios such as household electricity and small industrial equipment; the medium cross-section (70mm²) can meet medium-load requirements such as medium-sized motors and building power distribution; while the large cross-sectional specification of 240mm² is applicable to high-power transmission scenarios such as large factories, substations, and high-voltage transmission branches, effectively carrying high currents and ensuring the stable operation of large equipment. The insulation layer of the cable is made of PVC, which has good insulation performance, corrosion resistance, and mechanical strength. It can effectively isolate the conductor from the external environment, preventing safety hazards such as electric leakage and short circuits. At the same time, PVC material has relatively low cost and mature processing technology, which helps control the production cost of the cable and improve the product's cost performance. "Flexibility" is an important feature of this cable. Its conductor is made of multiple strands of fine copper wire twisted together. Compared with single-strand hard conductors, it has better flexibility and bending performance, facilitating installation in narrow spaces and complex wiring environments, and reducing construction difficulties. Especially in scenarios such as building pre-embedding, internal wiring of equipment, and pipeline threading, the flexible design can significantly improve construction efficiency and reduce the risk of conductor damage caused by excessive bending. In terms of models, both YJVR and VVR belong to flexible cables with PVC insulation and sheathing, suitable for power transmission and distribution systems with AC rated voltage of 0.6/1kV and below. There are slight differences in their structures: YJVR usually uses cross-linked polyethylene as the inner insulation layer, and the outer layer is wrapped with PVC sheathing, further improving high-temperature resistance and aging resistance; while VVR directly uses PVC as insulation and sheathing materials, focusing more on basic insulation and economy. Users can choose the appropriate model according to the temperature, humidity, and durability requirements of the specific use environment. As a product made in China, this cable complies with relevant domestic standards (such as GB/T 12706). It undergoes strict quality inspections during the production process to ensure that its electrical performance, mechanical performance, and safety performance meet the specifications. In recent years, China's cable manufacturing industry has continuously improved in terms of technical processes and quality control. Its products not only meet domestic market demand but also are exported to many countries and regions, possessing certain international competitiveness. In summary, this 4-core copper flexible power cable (YJVR/VVR type) has become an ideal choice for power transmission in industrial, construction, and civil fields due to its diverse specifications, reliable performance, flexible installation characteristics, and economic cost, providing safe, efficient, and convenient solutions for various power systems.