The 25mm², 35mm² 4-core armoured flame-retardant power cables produced by reliable manufacturers, with copper as conductors and polyvinyl chloride (PVC) as insulation layers, are key power transmission equipment with both safety and durability.​ In terms of specifications, the 4-core structure of 25mm² and 35mm² can meet different current-carrying capacity requirements. The current-carrying capacity of 25mm² is about 85-110A, and that of 35mm² is about 110-140A, suitable for medium and low voltage power distribution systems. The copper conductor has a purity of over 99.9% and excellent conductivity, ensuring efficient power transmission; the PVC insulation layer has good insulation and flame retardancy, with an oxygen index of ≥30, which can effectively delay the spread of flames and meet flame retardant standards. The armoured layer is made of steel tape or steel wire, enhancing the cable's resistance to mechanical damage and impact, and is suitable for complex laying environments such as buried and bridge frames.​ This cable is widely used in power distribution trunk lines of densely populated places such as high-rise buildings, shopping malls, and hospitals, as well as industrial plants, underground parking lots and other scenes with high safety requirements. The combination of its flame-retardant properties and armoured protection can reduce the risk of failures in case of fire or external impact, providing reliable guarantee for the stable operation of the power system, and is an ideal choice for places focusing on safety and durability.