This paper introduces a series of underground steel wire armored electric cables, with specifications covering various cross-sectional areas such as 50mm², 35mm², 16mm², and 25mm². Specifically designed for underground environments, these cables feature a steel wire armor layer, which is formed by tightly winding high-strength galvanized steel wires. This structure can effectively resist mechanical impacts, extrusion, and soil corrosion during underground construction, providing solid physical protection for the cables and significantly enhancing their durability in complex underground environments.​ The conductors of the cables are made of high-purity copper, ensuring excellent electrical conductivity, reducing power transmission losses, and meeting the high-efficiency requirements of underground power transmission. The insulation layer is mostly made of anti-aging and moisture-resistant materials (such as cross-linked polyethylene), forming double protection together with the armor layer to adapt to the harsh underground conditions of high humidity and multiple impurities.​ This series of cables is widely used in underground power transmission networks, municipal engineering underground pipelines, industrial park underground power distribution systems and other scenarios. They are particularly suitable for power laying in areas vulnerable to external interference, such as those needing to cross roads, railways, and rivers. Their diverse specifications can flexibly match the power transmission needs of different powers, providing stable and reliable power transmission support from branch distribution to main lines. They are key equipment with both safety and practicality in underground power engineering.