The N2XS(FL)2Y/NA2XS(FL)2Y medium voltage cable 12/20kV RM 1X300/25 and 1X400/50mm² aluminum conductor XLPE insulated cable features XLPE insulation and aluminum conductor structure, rated at 12/20kV. Compliant with German VDE 0276-620 standard and equipped with heavy-duty sheath design, it offers excellent mechanical strength and weather resistance, making it particularly suitable for direct burial or outdoor installations requiring high mechanical protection. The 1X300/25 specification features 300mm² conductor, while 1X400/50 has 400mm² conductor (50mm² equivalent metallic screen).

This product is an 8.7/15kV medium voltage (MV) power cable specifically designed for underground installation scenarios, featuring a fixed structure of 3 cores × 185mm². The core conductor is made of high-strength aluminum alloy, the insulation layer uses XLPE (cross-linked polyethylene) material, and the outer layer is equipped with a double-layer protective structure of SWA (steel wire armoring) and PVC sheath. It combines excellent electrical insulation performance, resistance to mechanical damage, and tolerance to complex underground environments, making it suitable for MV power transmission needs in urban distribution networks, industrial parks, large-scale buildings, and other scenarios. It is particularly adaptable to underground power projects such as underground cable trenches and direct burial installation, providing stable and reliable transmission support for MV power distribution systems.​ In terms of core structure and performance, the conductor is made of high-purity aluminum (aluminum content ≥99.7%) with alloying elements such as magnesium and silicon added, manufactured through a multi-strand layered stranding process. The 185mm² cross-sectional area of a single core enables each core to have a current-carrying capacity of 320A (in a 25℃ soil installation environment). The 3-core structure is compatible with the three-phase three-wire MV power distribution system, capable of stably transmitting a rated voltage of 8.7/15kV (phase voltage 8.7kV, line voltage 15kV), meeting the MV power distribution needs of urban distribution networks from substations to the user side. Compared with copper conductors, aluminum conductors are more than 60% lighter, significantly reducing transportation and construction costs during underground installation. Meanwhile, alloying treatment increases the conductor's tensile strength to over 120MPa, preventing conductor deformation caused by dragging during installation.​ The insulation layer is made of high-quality XLPE material, which forms a three-dimensional network molecular structure through high-temperature cross-linking treatment. It has a long-term allowable operating temperature of 90℃ and can withstand a maximum temperature of no more than 250℃ during short circuits (within 5 seconds of duration). It maintains excellent insulation performance even in humid underground environments, with an insulation resistance of ≥10¹⁴Ω·cm, a dielectric loss tangent value of ≤0.003 (at 100℃), and a partial discharge quantity of ≤10pC (under 1.73 times the rated voltage), far lower than the requirements of national standards, effectively avoiding power supply failures caused by insulation failure. In addition, the XLPE insulation layer also has excellent resistance to environmental stress cracking, showing no cracking after 1000 hours of damp heat testing, making it suitable for long-term humid and temperature-fluctuating underground operating environments.​ In terms of protective structure, the cable adopts a double-layer protective design of "SWA steel wire armoring + PVC sheath". The SWA armoring layer is made of high-carbon galvanized steel wires (2.0mm in diameter), wrapped around the insulated wire core in a double-layer spiral winding manner, with an armoring coverage rate of ≥90% and a tensile strength of ≥1500MPa. It can effectively resist soil pressure (capable of withstanding 30kN/m soil pressure), gravel extrusion, and underground biological gnawing during underground installation, preventing damage to the cable's insulation layer and conductor. The outer PVC sheath is made of modified polyvinyl chloride material with antioxidants and weather-resistant agents added, having an oxygen index of ≥32% and complying with the flame-retardant standards of GB/T 18380.3-2008. It can inhibit flame spread in underground fire hazard scenarios and also has acid and alkali corrosion resistance (after soaking in 10% hydrochloric acid and 20% sodium hydroxide solutions for 72 hours, the sheath volume change rate is ≤5%), making it suitable for corrosive soil environments that may exist underground.​ In terms of scenario adaptability, this cable is mainly used in underground MV power distribution projects: in urban distribution network construction, it can be used as an outgoing cable from substations, connecting various power distribution zones in the city through direct burial or cable trench installation. The 185mm² cross-sectional area can meet the daily electricity load transmission of an area (approximately 5000 households). In industrial parks, it can serve as the MV main cable within the park, providing stable MV power for factories and enterprises in the park. The SWA armoring layer can resist mechanical collisions during underground engineering construction in the park, ensuring power supply continuity. In the underground power distribution systems of large-scale buildings (such as commercial complexes and high-speed railway stations), this cable can be used as the MV power distribution trunk inside the building, connecting the transformers and high-voltage distribution cabinets in the building. The flame-retardant performance of the PVC sheath and the stability of the XLPE insulation can meet the strict requirements of buildings for power safety.​ In addition, the product strictly complies with GB/T 12706.3-2020 (domestic standard) and IEC 60502-2-2005 (international standard). Multiple quality inspections are conducted during the production process, including conductor DC resistance testing (≤0.153Ω/km), insulation withstand voltage testing (no breakdown for 1 minute under 2.5 times the rated voltage), and armoring layer adhesion testing (≥15N/cm), ensuring that every meter of cable meets the standard requirements. At the same time, the cable also has good installation adaptability, with a minimum bending radius of 15 times the cable outer diameter (approximately 300mm), facilitating the adjustment of installation paths in narrow underground spaces and providing convenience for efficient construction of underground power projects.