The NFC 33-209 standard is a key technical specification for Aerial Bundled Cables (ABC Cables) formulated by the French Association for Standardization (AFNOR). It defines the core requirements for ABC cables in terms of design, production, performance testing, and application scenarios, providing an authoritative basis for the selection and use of overhead cables in the power transmission field. As a type of overhead power transmission line that bundles multiple insulated conductors in a specific manner, ABC cables have significant advantages over traditional overhead bare conductor cables, such as high safety, convenient installation, low maintenance costs, and strong resistance to external environmental interference. They are widely used in medium and low-voltage distribution networks, especially in scenarios such as urban suburban power grid transformation, rural power grid upgrading, and power transmission in industrial parks. This summary focuses on the ABC cables compliant with the NFC 33-209 standard, mainly covering five two-core specifications: 2x10, 2x16, 2x25, 2x35, and 2x50. Here, "2x" indicates that the cable has a two-core structure, and the subsequent numbers (10, 16, 25, 35, 50) refer to the cross-sectional area of a single conductor (unit: mm²). Different cross-sectional specifications correspond to different current-carrying capacities and application scenarios, which can meet diverse power transmission needs. In terms of conductor material and structure, in accordance with the requirements of the NFC 33-209 standard, the conductors of these five specifications of ABC cables are usually made of high-purity electrolytic copper or high-quality aluminum alloy. Copper conductors have excellent electrical conductivity, good ductility, and corrosion resistance, which can effectively reduce losses during current transmission and are suitable for scenarios with high requirements for conductive efficiency. Aluminum alloy conductors, on the other hand, have advantages in light weight and cost-effectiveness. After special processing, their mechanical strength and fatigue resistance can meet the long-term use requirements of overhead installation. The conductor structure is mostly stranded, composed of multiple thin wires twisted together. This structure not only improves the flexibility of the conductor, facilitating bending operations during construction and installation, but also enhances the mechanical strength of the conductor, preventing breakage caused by external forces (such as wind force, ice and snow loads) during overhead use. Regarding the insulation layer, the standard has strict regulations on the insulation materials and performance of the five specifications of cables. Cross-linked polyethylene (XLPE) or high-density polyethylene (HDPE) are mainly used as insulation materials. The XLPE insulation layer has the characteristics of high temperature resistance, aging resistance, stable insulation performance, and chemical corrosion resistance. It can maintain good insulation effect within the temperature range of -40℃ to 90℃, effectively preventing short circuits or leakage accidents in the line. The HDPE insulation layer has outstanding performance in wear resistance and impact resistance, and is suitable for installation scenarios with complex external environments (such as areas with much sand and wind or many trees). The thickness of the insulation layer needs to match the conductor cross-sectional area and the rated voltage level to ensure that there is no power leakage due to insulation aging or damage during long-term use, and to ensure the safe operation of the line. In terms of mechanical properties and environmental adaptability, the NFC 33-209 standard specifies key indicators such as tensile strength, bending radius, and weather resistance for the five specifications of ABC cables. Taking tensile strength as an example, cables of different cross-sectional areas need to withstand corresponding overhead tensions. The 2x50 specification cable has a higher tensile strength requirement than the 2x10 specification due to its larger conductor cross-sectional area, and can adapt to overhead installation needs with larger spans. The bending radius must be controlled within the specified range to avoid insulation layer damage or conductor breakage caused by excessive bending during construction. In addition, the cable must also have good weather resistance, which can resist the influence of natural environmental factors such as ultraviolet radiation, rain erosion, and alternating high and low temperatures, ensuring the performance stability and service life during long-term outdoor use. The designed service life can usually reach more than 20 years. In terms of application scenarios, the five specifications of ABC cables compliant with the NFC 33-209 standard can be flexibly selected according to different power load requirements. The 2x10 and 2x16 specification cables have relatively low current-carrying capacities, and are suitable for small-load scenarios such as low-voltage power distribution in residential communities and household power access in rural areas, which can meet the daily electricity needs of ordinary users. The 2x25 and 2x35 specification cables have medium current-carrying capacities, and can be used for power transmission in small and medium-sized industrial parks, township enterprises, and main lines of distribution networks in urban suburbs, adapting to medium-scale power consumption. The 2x50 specification cable has strong current-carrying capacity, and is suitable for power introduction in large industrial parks and high-load enterprises, or as an important connection line in the distribution network to ensure stable power supply for high-power equipment. During the installation process, ABC cables can be installed overhead through support structures such as electric poles and iron towers without excavating the ground, which not only reduces damage to the surrounding environment, but also greatly shortens the construction period and reduces engineering costs. It is especially suitable for areas with complex terrain or busy ground traffic. In terms of quality inspection and certification, ABC cables compliant with the NFC 33-209 standard need to pass a series of strict performance tests, including conductor DC resistance test (to ensure that the conductive performance meets the standard and reduce losses), insulation resistance test (to verify the insulation effect of the insulation layer and prevent leakage), voltage withstand test (to detect the withstand capacity of the insulation layer in a high-voltage environment and avoid breakdown), mechanical tensile test (to assess the tensile strength of the cable and ensure overhead safety), and weather resistance test (to simulate the natural environment and evaluate long-term use stability). Only cables that pass all test items and meet the standard requirements in all indicators can obtain the corresponding certification certificate and enter the market for circulation and application. This process effectively ensures the product quality and use safety of the cables, and provides an important guarantee for the stable operation of the power system.