In scenarios such as industrial equipment power supply, civil mobile electrical appliance connection, and temporary power transmission, flexible cables have become key components to ensure stable power transmission due to their excellent bending performance and flexible adaptability. The H05VV-F series 300/500V flexible cables, with "multi-core structure, wide specification coverage, and high flexibility" as core advantages, cover four core counts (2-core, 3-core, 4-core, 5-core) and conductor cross-sectional areas ranging from 0.75mm² to 6mm². They can be widely used in power scenarios such as household appliances, power tools, industrial control equipment, and temporary power supply systems, and are representative flexible cable products that balance safety and practicality.​ In terms of product structure, the H05VV-F cable adopts a three-layer composite structure of "multi-strand thin copper wire conductor + PVC insulation layer + PVC sheath layer", and the overall design focuses on the dual needs of "flexibility" and "protection". The conductor part is made of multi-strand high-purity oxygen-free copper wires stranded (each copper wire diameter 0.15-0.25mm). Compared with single-core hard copper conductors, the multi-strand stranded structure greatly improves the cable's bending performance - the minimum bending radius is only 4 times the cable outer diameter (for fixed laying) and 8 times the outer diameter (for mobile laying), and it can withstand frequent bending (≥10,000 bends without breaking), perfectly adapting to power tools, movable household appliances, and other equipment that need to adjust positions repeatedly. The conductor configurations of different core counts and specifications accurately match scenario requirements: 2-core cables (e.g., 0.75mm², 1mm²) are mainly used for single-phase equipment power supply (live wire + neutral wire); 3-core cables (e.g., 1.5mm², 2.5mm²) add a ground wire core, adapting to equipment requiring grounding protection (e.g., washing machines, refrigerators); 4-core and 5-core cables are mostly used in three-phase equipment or multi-circuit control scenarios (e.g., industrial motors, distribution box shunt power supply), among which 5-core cables can also realize synchronous transmission of "power + signal", reducing the number of wiring.​ Both the insulation layer and sheath layer are made of environmentally friendly PVC materials, and realize functional division through differentiated formula optimization. The insulation layer wraps around the outside of a single conductor, with a thickness of 0.6-0.9mm (increasing with the increase of conductor cross-sectional area). The insulation resistance is ≥100MΩ (at 20℃), and the temperature resistance range is -15℃ to 70℃, which can effectively isolate leakage between conductors and resist the impact of ambient temperature fluctuations on insulation performance; the outer sheath has a thickness of 0.8-1.2mm, added with anti-aging agents and wear-resistant agents, with a tensile strength of ≥12MPa and an elongation at break of ≥150%, which can withstand mechanical friction during construction and use (wear test: load 5N, 1000 friction times, sheath wear ≤0.1mm). It also complies with the EU RoHS environmental standard, with harmful substance content such as lead and cadmium ≤1000ppm, meeting environmental requirements of multiple indoor and outdoor scenarios. In addition, the overall outer diameter of the cable is accurately controlled. Taking the 3-core 2.5mm² specification as an example, the outer diameter is only 12.5mm±0.5mm, which can easily pass through narrow wiring spaces (e.g., equipment internal wiring grooves, wall threading pipes), reducing construction difficulty.​ In terms of electrical performance and applicable scenarios, the H05VV-F cable has a rated voltage of 300/500V (rated voltage U0/U is 300V/500V), adapting to low-voltage power distribution systems. The current-carrying capacity of different core counts and specifications covers a wide range, allowing accurate selection according to equipment power. The 0.75mm² and 1mm² specifications (common for all core counts) have a rated current-carrying capacity of 5-8A (at 30℃ ambient temperature) and an applicable power of 1.1-1.76kW, mainly used for small power tools (e.g., electric drills, sanders, power 300-800W), small household appliances (e.g., desk lamps, humidifiers, power 50-200W), and temporary lighting systems (e.g., construction temporary lamps, power 100-300W). The combination of their small specification characteristics and high flexibility enables flexible laying in narrow spaces (e.g., under furniture, inside equipment).​ The 1.5mm² and 2.5mm² specifications have a rated current-carrying capacity of 10-16A and an applicable power of 2.2-3.52kW, which are mainstream choices for household and small industrial scenarios: 2-core and 3-core specifications can be used for washing machines (power 500-800W), air conditioners (1.5 horsepower, power 1.2-1.8kW), electric ovens (power 1500-2000W) and other equipment; 4-core and 5-core specifications are suitable for small three-phase motors (e.g., small water pumps, fans, power 1.5-2.2kW) and industrial control box shunt power supply, realizing multi-circuit power distribution.​ The 4mm² and 6mm² specifications have a rated current-carrying capacity of 20-28A and an applicable power of 4.4-6.16kW, targeting medium and high-power scenarios: 3-core and 4-core specifications can be used for industrial power tools (e.g., large cutting machines, air compressors, power 3-5kW), commercial kitchen equipment (e.g., large disinfection cabinets, electric fryers, power 4-6kW); 5-core specifications are mostly used for three-phase industrial equipment (e.g., small machine tools, conveyor motors, power 5-6kW). Their large cross-sectional area conductors can effectively reduce current transmission loss. Under long-term high-load operation (continuous operation ≥8 hours), the cable temperature rise is ≤30K, avoiding insulation layer aging caused by overheating.​ In terms of safety and usage specifications, the H05VV-F cable complies with the EU EN 50525-2-21 standard and the national standard GB/T 5023.5-2008 Polyvinyl Chloride Insulated Cables with Rated Voltage of 450/750V and Below - Part 5: Flexible Cables (Cords). Before leaving the factory, it must pass multiple tests such as voltage resistance test (AC 2500V/5min without breakdown), flame performance test (meeting EN 60332-1-2 single vertical combustion requirements, flame spread speed ≤100mm/min), and ozone resistance test (ozone concentration 0.025%, placed at 40℃ for 72 hours without cracks) to ensure safety performance meets standards. During use, attention should be paid to: avoiding dragging the cable over sharp objects during mobile laying to prevent sheath damage; avoiding direct contact with high-temperature heat sources (e.g., radiators, exhaust pipes), and the long-term operating temperature should not exceed 70℃; when using 4-core or 5-core cables for three-phase equipment, ensure the ground core is reliably grounded, with a grounding resistance ≤4Ω, to prevent safety accidents caused by equipment leakage.​ In conclusion, the H05VV-F 300/500V flexible cable realizes accurate adaptation to different power application scenarios through multi-core structure, wide specification coverage, and high flexibility design. In actual selection, it is necessary to comprehensively judge based on equipment power, power supply method (single-phase/three-phase), and usage environment (fixed/mobile), give full play to its advantages of "flexible laying, safety and durability", and ensure the efficient and stable operation of the power system.