The 450/750V PVC insulated Class 2 stranded copper wire is a high-performance cable suitable for fixed electrical installations, with specifications covering 2.5mm², 4mm², 6mm², and 10mm². It fully complies with IEC 60228 (conductor standard) and IEC 60227 (insulated cable standard), and has become an ideal choice for industrial, commercial, and civil fixed wiring due to its excellent performance.​ In terms of conductor structure, the cable adopts a Class 2 stranded copper wire design, which is composed of multiple strands of finer copper wires stranded according to specific rules. The 2.5mm² cable is composed of 19 copper wires with a diameter of 0.41mm, the 4mm² cable of 19 copper wires with a diameter of 0.52mm, the 6mm² cable of 19 copper wires with a diameter of 0.64mm, and the 10mm² cable of 49 copper wires with a diameter of 0.52mm. This stranding method not only endows the conductor with excellent flexibility, making it easy to bend and thread through pipes in complex fixed installation environments, adapting to laying scenarios such as walls and cable trays, but also enhances the mechanical strength of the conductor, which can withstand slight vibration and stretching during installation and long-term use, extending the service life of the cable. The purity of the copper conductor is as high as 99.95% or more, with excellent conductivity. The DC resistance at 20℃ is: 2.5mm² ≤7.41Ω/km, 4mm² ≤4.61Ω/km, 6mm² ≤3.08Ω/km, 10mm² ≤1.83Ω/km, which can efficiently transmit current and reduce line loss.​ The insulation layer is made of polyvinyl chloride (PVC) material, and its thickness is precisely designed according to different specifications: 0.8mm for 2.5mm², 0.8mm for 4mm², 1.0mm for 6mm², and 1.0mm for 10mm². The PVC insulation layer has good insulation performance, with a withstand voltage strength of not less than 10kV/mm, which can reliably isolate current under the rated voltage of 450/750V and prevent electric leakage accidents. At the same time, its temperature resistance range is -15℃ to 70℃, which can adapt to temperature changes in most fixed installation environments. It also has certain corrosion resistance and oil resistance, which can resist dust, moisture, and slight chemical erosion, ensuring the stable operation of the cable.​ In fixed electrical installations, the applicable scenarios of cables of different specifications are clear: 2.5mm² is often used in lighting circuits, ordinary socket circuits, and wiring of small power equipment, such as household lamps and office sockets; 4mm² is suitable for special lines of medium-power electrical appliances such as air conditioners and electric water heaters, and connection of small power cabinets in commercial places; 6mm² can meet the needs of industrial small motors, main circuits of distribution boxes, etc.; 10mm² is used in high-power scenarios such as large air conditioning units, main power supplies of industrial equipment, and main incoming lines of buildings. Its compliance with IEC standards ensures the universality and safety of the product in the international market. Whether it is the wiring project of new buildings or the renovation and upgrading of old lines, it can provide reliable power transmission support.​ In addition, the flame retardant performance of the cable meets the IEC 60332-1-2 standard, which can effectively delay the spread of flames in the vertical burning test, buying time for personnel evacuation and equipment protection in case of fire. Overall, the 450/750V PVC insulated Class 2 stranded copper wire, with its high-quality stranded copper conductor, reliable PVC insulation layer, diverse specification options, and strict standard compliance, has become the preferred cable in the field of fixed electrical installations, providing a solid guarantee for the safe operation of power systems in various buildings and facilities.