The Nyy Cu/PVC/PVC 4-core 35mm² copper DC power cable is a high-performance cable designed specifically for DC power transmission. With a core structure consisting of copper conductors, PVC insulation layers, and a PVC sheath, it combines stable conductive performance with reliable environmental adaptability, making it widely used in new energy, industrial DC systems, and communications fields.​ In terms of specification parameters, this cable adopts a 4-core 35mm² structural design, with each core conductor having a cross-sectional area of 35mm², suitable for medium to high-power DC transmission scenarios. At an ambient temperature of 25℃, the long-term allowable current-carrying capacity of each core is approximately 130A (in DC state). The corresponding power varies depending on the system voltage: when applied in a 750V DC system, the single-core transmission power is about 97.5kW, and the total power of 4 cores can reach 390kW, which is sufficient to meet the power supply needs of large-scale photovoltaic inverters, energy storage systems, and other equipment. The rated DC voltage of the cable is usually 1.8kV, and some models can be customized to higher voltage levels according to requirements. Its outer diameter is about 40mm, among which the PVC insulation layer thickness is about 1.6mm, and the inner PVC sheath thickness is about 2.0mm. The overall structure is compact with excellent mechanical strength, and the minimum bending radius is 10 times the outer diameter (about 400mm), facilitating installation in narrow spaces. In addition, the cable's short-circuit withstand temperature can reach 80℃, enabling it to maintain stable operation under short-term overload conditions and ensuring the continuity of the DC system.​ In terms of materials and structure, the conductor is made of high-purity electrolytic copper (purity ≥99.95%), which has extremely low DC resistance (≤0.524Ω/km at 20℃), effectively reducing transmission loss and improving energy utilization efficiency. The copper conductor is stranded into multiple strands, enhancing the flexibility of the cable, making it less likely to break during bending and dragging. The insulation layer is a PVC material resistant to DC electric fields, optimized through a special formula, with excellent volume resistivity (≥10¹⁴Ω·cm) and corona resistance. It can effectively suppress space charge accumulation under DC conditions and avoid accelerated insulation aging. The outer PVC sheath provides double protection, not only having good wear resistance, acid and alkali corrosion resistance, but also resisting erosion from environmental factors such as ultraviolet rays and moisture, extending the service life of the cable. This three-layer structure of "copper conductor + PVC insulation + PVC sheath" achieves a balance between cost and reliability while ensuring electrical performance.​ In terms of characteristic uses, this cable performs prominently in the new energy field: in photovoltaic power stations, it can be used as the DC connection cable from the string to the combiner box and from the combiner box to the inverter, withstanding outdoor high and low temperatures (-30℃ to 70℃) and day-night temperature differences; in energy storage systems, it is used for power transmission between battery clusters and PCS (energy storage converters), adapting to the possible humid environment in battery rooms. In the industrial field, it is suitable for DC power supply scenarios such as electrolytic cells and electroplating equipment, and its chemical corrosion-resistant sheath can resist electrolyte splashing; in communication base stations, it serves as the connection cable between the DC power cabinet and equipment, ensuring 24-hour uninterrupted power supply for the base station. In addition, it can be used in the DC output lines of electric vehicle charging piles, as well as the DC traction auxiliary systems of subways, light rails, etc., meeting the stable transmission needs of high-frequency charging and discharging.​ Compared with similar DC cables, the advantages of the Nyy Cu/PVC/PVC 4X35mm² cable are: the low cost of PVC materials, suitable for large-scale applications; the high conductivity of copper conductors reduces line loss; the 4-core design enables multi-loop parallel transmission, simplifying wiring. However, it should be noted that its flame retardancy is at a general level, not suitable for open flame environments, and the long-term working temperature does not exceed 70℃, so it should be avoided to be installed near heat sources.​ In conclusion, the Nyy Cu/PVC/PVC 4-core 35mm² copper DC power cable, with its suitable specifications, reliable material combination, and wide scenario adaptability, has become an ideal choice in DC power transmission systems, providing stable power support for new energy development, industrial production, and infrastructure construction.