This product is an H07V-K (NYAF) series cable specifically designed for heating applications, covering four common cross-sectional area specifications: 16mm², 25mm², 35mm², and 50mm². The conductor is made of stranded copper wire, with a blue insulation layer, and possesses excellent heat resistance, electrical performance, and mechanical strength. It can stably adapt to the power transmission needs of various heating equipment such as electric heaters, heating furnaces, and underfloor heating systems, playing a key role in industrial production, commercial heating, and residential heating fields, and serving as a core cable component to ensure the safe and efficient operation of heating equipment.​ In terms of core specification parameters, the cross-sectional areas of this series of cables range from 16mm² to 50mm², which can accurately match the current-carrying requirements of heating equipment with different powers. Among them, the continuous current-carrying capacity of the 16mm² cable is approximately 85A (when laid in air at an ambient temperature of 25℃), suitable for small and medium-sized electric heaters with a power of less than 19kW (such as small noodle cookers in commercial kitchens and small industrial drying equipment); the 25mm² specification has a current-carrying capacity of about 110A, which can be adapted to heating equipment with a power of around 24kW (such as auxiliary electric heaters for central air conditioners in shopping malls and medium-sized industrial heating tanks); the 35mm² specification has a current-carrying capacity of up to 135A, which can meet heating scenarios with a power of 29kW (such as large workshop heating systems and high-temperature industrial heating furnaces); the 50mm² specification has a maximum current-carrying capacity of 170A, which can be used for high-power heating equipment above 37kW (such as heating devices for reactors in large chemical plants and main power supply lines for centralized underfloor heating). All four specifications adopt the "NYAF" stranded conductor structure, that is, composed of multiple strands of fine copper wires stranded at a specific pitch (for example, 16mm² is stranded by 37 copper wires with a diameter of 0.75mm, and 50mm² is stranded by 84 copper wires with a diameter of 0.86mm). Compared with single-strand hard conductors, the stranded structure not only improves the flexibility of the cable, allowing it to bend flexibly in narrow spaces (the minimum bending radius is 6 times the outer diameter of the cable), but also enhances heat dissipation performance, preventing the insulation layer from aging due to local overheating of the cable when the heating equipment is in operation.​ In terms of material selection, the conductor is made of high-purity electrolytic copper (purity ≥99.95%), with a resistivity of only 0.0172Ω·mm²/m (at 20℃), much lower than other conductive materials such as aluminum, which can effectively reduce power loss during current transmission. Taking a 50mm² cable transmitting 170A current with a length of 100 meters as an example, the hourly power loss is only 170²×0.0172×100÷50×3.6×10⁻³≈3.4kW·h, far lower than that of an aluminum conductor cable of the same specification (about 5.6kW·h), which can significantly reduce energy consumption costs in long-term use. At the same time, the copper conductor has excellent high-temperature resistance. When the temperature around the heating equipment reaches 80℃, it can still maintain stable electrical conductivity and mechanical strength, preventing the conductor from softening or breaking due to high temperature. The insulation layer is made of polyvinyl chloride (PVC) material that meets the H07V-K standard. This material has undergone special heat-resistant modification treatment, with a long-term operating temperature of up to 70℃ and a short-term overload temperature of 105℃, fully adapting to the high-temperature environment of heating application scenarios; moreover, the insulation layer has good oil resistance and chemical corrosion resistance, which can resist oil pollution and weak acid gas erosion common in industrial environments, extending the service life of the cable. In addition, the insulation layer adopts a blue design, which not only complies with the international general color identification standard for heating equipment cables (blue usually represents heating circuit cables) but also facilitates construction personnel to quickly distinguish the purpose of the cable and reduce the risk of wiring errors.​ In terms of application scenarios, this series of cables widely covers heating needs in various fields due to their excellent heat resistance and current-carrying capacity. In the industrial field, it can be used in heating devices for coating lines in automobile manufacturing workshops, constant-temperature heating tables for chip packaging processes in electronics factories, and baking equipment in food processing plants. Its oil-resistant and corrosion-resistant insulation layer can adapt to the complex environment of industrial workshops; in commercial scenarios, it is suitable for electric auxiliary heating systems of central air conditioners in hotels and office buildings, defrosting heaters for cold chain equipment in large supermarkets, and constant-temperature heating devices for swimming pools in gyms. The blue insulation layer facilitates quick identification and maintenance during later maintenance; in the residential field, it can be used as the power supply cable for household split-type underfloor heating, wall-mounted electric heaters, and intelligent toilet heating seats. The flexibility of the stranded structure allows it to easily pass through wall or floor pipelines without affecting the aesthetics of indoor decoration.​ In addition, this series of cables is produced in strict accordance with the IEC 60227 standard, and each batch of products undergoes rigorous quality testing: in terms of electrical performance, the insulation resistance is ≥100MΩ·km (at 25℃), and there is no breakdown in the power frequency withstand voltage test (1.5kV/1min); in terms of mechanical performance, after repeated bending tests (2000 times) and wear tests, the insulation layer is not damaged and the conductor is not broken; in terms of environmental performance, after the 70℃×168h thermal aging test, the tensile strength change rate of the insulation layer is ≤20%, and the elongation at break change rate is ≤30%, ensuring stable and reliable product quality. At the same time, the cable is packaged in moisture-proof sealed rolls (100 meters or 200 meters per roll), wrapped with a waterproof plastic film and a hard cardboard drum, which can effectively prevent moisture and dust from entering during transportation and storage, ensuring that the cable performance is not affected.