Nyy-J 4-core copper cable is a high-performance cable specially designed for power distribution and industrial plants, covering specifications such as 70mm², 95mm², 120mm², and 185mm². It adopts a structure of multi-stranded stranded copper conductors with PVC insulation and sheathing, and is widely used in high and low voltage distribution systems, industrial production lines, and power supply for large-scale equipment. With excellent current-carrying capacity, weather resistance, and mechanical strength, it has become a core choice for industrial power transmission.​ In terms of specification parameters, there are significant differences in current-carrying capacity and applicable scenarios among various gauges. The 185mm² cable has a current-carrying capacity of 420A at 90°C, suitable for factory main incoming lines and connections of large transformers; the 120mm² has a current-carrying capacity of 340A, adapted to medium-sized distribution trunks and high-power motor groups; the 95mm² has a current-carrying capacity of 280A, which can be used as the main cable of workshop distribution boxes; the 70mm² has a current-carrying capacity of 225A, suitable for special lines of small and medium-sized equipment and branch lines. The conductor is made of 99.9% pure electrolytic copper, and the multi-stranded stranded structure improves flexibility, with a minimum bending radius of 6 times the outer diameter, facilitating laying in narrow spaces.​ The material design highlights durability: the outer layer of the conductor is covered with PVC insulation resistant to 90°C, with an insulation resistance of ≥100MΩ, resistant to chemical corrosion and ultraviolet aging; the overall sheath is also made of PVC material, with a thickness of 1.8-2.5mm (increasing with specifications), a hardness of Shore D 75, and excellent impact and wear resistance. It can be directly buried underground or laid along walls, meeting the strict requirements of EN 50525 standard for industrial environments. The 4-core design includes 3 phase lines and 1 neutral line, with clear color identification (brown/black/gray for phase lines, blue for neutral line), simplifying the wiring process.​ Application scenarios cover all industrial fields: in power distribution systems, 185mm²/120mm² are used as trunk lines to connect substations and factory distribution rooms, and 95mm²/70mm² are distributed to various production workshops; in industrial plants, they drive equipment such as assembly line motors, furnaces, and compressors, withstanding oil pollution, vibration, and high-temperature environments. With a service life of more than 20 years and low attenuation characteristics, it is suitable for new factories and old line transformation, balancing safety and long-term reliability, and is an ideal choice for industrial power transmission.