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.