The N2xs (FL) 2y / N2xs F 2y Na2xse (F) 2y series cables introduced in this article are power transmission cables suitable for medium-voltage scenarios, with rated voltages covering 12kV and 20kV, which can meet the power transmission needs of different medium-voltage power systems. This series of cables includes various specifications, specifically 1X185/25, 1X240/25, and 1X300/25. Among them, "1X" indicates a single-core structure, which is common in medium-voltage cables. This structure helps reduce electromagnetic interference inside the cable and improve the stability of power transmission. The following numbers such as 185, 240, and 300 refer to the cross-sectional area of the cable conductor (unit: square millimeters). Different cross-sectional areas determine the current-carrying capacity of the cable. Generally, a larger cross-sectional area means a higher current-carrying capacity, making it applicable to power transmission scenarios with different powers. The number 25 may represent the size parameter of the cable's insulation layer or other related structures, ensuring the insulation performance and overall structural stability of the cable. Judging from the models, models such as N2xs (FL) 2y, N2xs F 2y, and Na2xse (F) 2y may reflect different structural characteristics or applicable environments of the cables. For example, "FL" may indicate that the cable has certain fire-resistant properties, suitable for places with high fire protection requirements, such as high-rise buildings, subways, power plants, etc.; "F" may represent other specific protective properties, such as corrosion resistance and waterproofing, enabling the cable to work normally in humid environments with many corrosive media. The sheath colors of the cables are black, red, and blue. The sheath is the outer protective structure of the cable, which protects the internal conductors, insulation layers, etc. from external mechanical damage, chemical corrosion, and environmental influences. Different colors facilitate the identification and differentiation of cables during installation and maintenance, especially in complex power systems, which can reduce the risk of misoperation and improve the efficiency of construction and maintenance. To sum up, the N2xs (FL) 2y / N2xs F 2y Na2xse (F) 2y series 12/20kV medium-voltage cables, with their diverse specifications, specific structural designs, and reliable performance, can be widely used in various medium-voltage power transmission scenarios, providing strong support for the stable operation of power systems.