The single core PVC insulated copper Nyy cable series covers various specifications including 25mm², 50mm², 70mm², 95mm², and 300mm². With the high conductivity of copper conductors and the stable protective performance of PVC insulation layers, it has become an ideal choice in industrial power distribution, building wiring, and municipal engineering. This series of cables is based on a single core structure, and adapts to different power requirements through differentiated conductor cross-sectional areas, realizing full coverage from low-voltage to medium-voltage scenarios.​ In terms of core performance, the conductor is made of electrolytic copper with a purity of more than 99.95%, ensuring low resistance characteristics: the DC resistance of the 25mm² specification conductor is ≤0.727Ω/km, and that of the 300mm² specification is ≤0.062Ω/km. The current transmission loss is reduced by more than 15% compared with similar products. The PVC insulation layer is optimized with a special formula, with a temperature resistance range of -15℃~70℃ and an insulation resistance of ≥500MΩ·km, which can resist moisture, mold, and general chemical corrosion, and is especially suitable for underground direct burial or wall concealed laying environments. The integrated design of the sheath and insulation layer of the Nyy model improves mechanical strength, with a tensile strength of ≥12MPa and an elongation at break of ≥150%, which can withstand dragging and extrusion during construction.​ The specification differentiation brings precise adaptation of uses: 25mm² cables are mostly used for residential distribution branches and small motor power supply, such as household central air conditioners, water pumps and other equipment; 50mm² and 70mm² are suitable for commercial building main lines and medium-sized industrial machinery, such as shopping mall lighting systems and injection molding machines; 95mm² and 300mm² are competent for large factory transformer connections and urban power grid branches, such as steel mill rolling mills and substation outlet cabinets. The whole series has passed the GB/T 5023.3-2008 standard certification, and the 300mm² specification can also meet the needs of medium-voltage scenarios below 10kV, with both high-voltage tolerance and installation flexibility.​ In terms of installation and maintenance, the bending radius of this series of cables is ≥10 times the outer diameter. The 25mm² specification can be bent by hand, and the 300mm² can complete bridge laying with special tools. The flame retardant property of PVC material (meeting GB/T 18380.3-2008 Class C) reduces the fire risk, and the halogen-free and low-smoke formula reduces the release of toxic gases. Each meter of the sheath is printed with clear marks, including specifications, voltage level and certification information, which is convenient for construction identification and later traceability. During long-term use, it is recommended to carry out insulation resistance testing every 3 years to ensure stable performance.