The RVV 4-core 1.5mm²/2.5mm²/4mm²/6mm² flexible PVC power wire, a common product in the electrical wiring field, is widely used in home electricity use, commercial place power transmission, and industrial equipment power supply scenarios due to its multi-specification adaptability, flexible structural design, and reliable safety performance. Its core advantages first lie in the coordinated design of the conductor and insulation structure: the conductor is made of high-purity oxygen-free copper (purity ≥99.99%), stranded with multiple strands of fine copper wire (1.5mm² consists of 19 strands of Φ0.32mm copper wire, 2.5mm² of 19 strands of Φ0.41mm copper wire, 4mm² of 37 strands of Φ0.37mm copper wire, and 6mm² of 49 strands of Φ0.41mm copper wire). This not only ensures excellent electrical conductivity (DC resistance at 20℃ is ≤13.3Ω/km for 1.5mm², ≤8.21Ω/km for 2.5mm², ≤5.38Ω/km for 4mm², and ≤3.08Ω/km for 6mm²) but also improves the cable flexibility through the stranding process. The minimum bending radius is only 4 times the cable outer diameter (taking the 2.5mm² model as an example, with an outer diameter of about 6.5mm, the bending radius only needs 26mm), which can easily adapt to complex wiring environments such as wall concealed pipes and narrow spaces inside equipment, avoiding the risk of conductor breakage during construction.​ The insulation and sheath layers are made of environmentally friendly PVC material (complying with the RoHS standard), which has excellent temperature resistance and corrosion resistance after optimization with a special formula: the long-term operating temperature range is -15℃ to 70℃, and the short-term overload temperature can reach 105℃. In high-temperature environments in summer (such as 50-60℃ inside distribution boxes) or low-temperature environments in winter ( -10℃ outdoors in northern China), it can still maintain stable performance without softening or cracking; at the same time, the PVC material is oil-resistant and acid-alkali-resistant. In kitchen oil-polluted environments and light chemical corrosion scenarios in laboratories, the sheath layer is not easy to age and break, effectively extending the service life of the cable (up to 8-10 years under normal use). In addition, the sheath layer has also passed the GB/T 18380.1-2008 ZC-grade flame retardant test, self-extinguishing within 30 seconds when exposed to fire, and does not release toxic or harmful gases (chlorine release ≤5mg/g), providing important protection for electrical wiring safety.​ From the perspective of application scenarios, the four specifications accurately match different electricity needs: the 1.5mm² model is mainly used for home weak current control and small equipment power supply, such as smart door lock power supplies, curtain motor wiring, and power cords for small home appliances (humidifiers, air purifiers). Its safe current-carrying capacity is 16-20A (when laid in the air), which can carry a power of ≤4.4kW, meeting the long-term stable operation of low-power equipment; the 2.5mm² model is suitable for home strong current circuits and ordinary sockets in commercial places, such as living room air conditioners (1.5 HP), bedroom electric heaters (2000W), and office computer cluster power supply. The current-carrying capacity is 25-32A, adapting to a power of ≤7kW, taking into account daily electricity use and short-term overload needs; the 4mm² model is mostly used for high-power equipment in commercial places and small industrial power circuits, such as shopping mall lighting main lines, restaurant commercial freezers (3000W), and workshop small motors (4kW) power supply. The current-carrying capacity is 32-40A, which can cope with continuous high-power operation; the 6mm² model is suitable for building main incoming lines and medium-sized industrial equipment power supply, such as villa entry branch circuits, factory air compressors (7.5kW), and elevator traveling cable auxiliary power supply. The current-carrying capacity is 40-50A, ensuring no overload heating during high-current transmission.​ In terms of construction and practicality, this series of cables also has significant advantages: the cable surface is printed with clear product identification (model, specification, rated voltage, production batch number, and implementation standard GB/T 5023.5-2008), using wear-resistant ink printing that remains legible after long-term friction, facilitating specification verification during construction and traceability during later maintenance; the 4-core structure design enables simultaneous transmission of power and signals. For example, in an intelligent monitoring system, 1 core is used for equipment power supply, 2 cores for signal transmission, and 1 core as a backup, reducing the number of cable layouts and lowering construction costs; in addition, the lightweight design of the cable (weight per kilometer is about 18kg for 1.5mm² and 55kg for 6mm²) reduces the handling intensity of high-altitude wiring and long-distance pipe threading. Combined with the flexible structure, the pipe threading resistance is reduced by 30% compared with single-strand rigid wires, improving construction efficiency.

The Flexible Rubber Insulated Cables, specified under the designations H05RN-F and H07RN-F, represent a robust category of electrical cables engineered for flexibility, durability, and reliable performance in challenging environments. Available in 2 to 6 core configurations with conductor cross-sections ranging from 4mm² to 25mm², these cables are designed to meet stringent European standards (EN 50525) for heavy-duty applications where resistance to mechanical stress, moisture, and temperature variations is critical. At the core of these cables is their rubber insulation and sheathing, typically made from chloroprene or ethylene propylene diene monomer (EPDM) rubber. This material choice distinguishes them from PVC-insulated cables, offering superior flexibility even at low temperatures and enhanced resistance to oils, chemicals, and abrasion. The rubber compounds used are formulated to withstand continuous operating temperatures from -30°C to 90°C, making them suitable for both indoor and outdoor use in harsh climates, including construction sites, industrial facilities, and outdoor events. The H05RN-F and H07RN-F designations denote specific performance characteristics. The "H" indicates they are heavy-duty cables, while the numbers "05" and "07" refer to their voltage ratings: H05RN-F is rated for 300/500V, ideal for low-voltage power distribution, while H07RN-F is rated for 450/750V, suitable for higher-power applications. The "RN" signifies that they are rubber-insulated and sheathed with a braided reinforcement (often textile or steel), which enhances mechanical strength without compromising flexibility. The "-F" indicates they are flexible, a key attribute derived from their fine-stranded copper conductors. These cables are available in multiple core counts (2 to 6 cores) to accommodate diverse wiring needs. For example, 2-core cables are commonly used for simple power connections, while 3-core and 4-core variants are ideal for three-phase systems or applications requiring a neutral or ground conductor. The 5-core and 6-core options cater to more complex setups, such as machinery with integrated control systems that require separate power and signal lines. Conductor sizes range from 4mm² to 25mm², with each size corresponding to specific current-carrying capacities. The 4mm² and 6mm² cables are suitable for medium-power devices like portable tools or small motors, while 10mm² to 25mm² cables handle higher currents, making them suitable for large machinery, generators, or temporary power distribution on construction sites. All conductors are made from high-purity copper, ensuring excellent electrical conductivity and minimizing energy loss. A defining feature of these cables is their flexibility, achieved through fine-stranded copper conductors and supple rubber insulation. This allows them to be easily bent, coiled, and routed around obstacles, a critical advantage in dynamic environments where cables are frequently moved or repositioned. The braided reinforcement layer adds tensile strength, preventing stretching or damage during handling, while the rubber sheath resists cuts, impact, and UV radiation, ensuring longevity in rugged conditions. Applications for H05RN-F and H07RN-F cables are diverse and include construction sites, where they power tools, lighting, and temporary facilities; industrial plants, where they connect machinery and conveyors; outdoor events, such as concerts or festivals, for temporary power distribution; and marine environments, where their moisture resistance protects against corrosion. They are also commonly used in mining, agriculture, and emergency services, where reliability in harsh conditions is paramount. Compliance with EN 50525 ensures these cables meet strict safety standards, including flame retardancy and low smoke emission, reducing fire risks in enclosed spaces. They are also RoHS-compliant, free from hazardous substances, making them suitable for eco-sensitive applications. In summary, H05RN-F and H07RN-F flexible rubber insulated cables combine robust construction with exceptional flexibility, making them indispensable for demanding environments. Their range of core counts and conductor sizes, paired with resistance to temperature, chemicals, and mechanical stress, ensures they can adapt to diverse electrical needs. Whether powering construction equipment, industrial machinery, or temporary installations, these cables deliver consistent performance, safety, and durability where standard cables would fail.