This article details various specifications of power cables, including 3×25+1×10, 3×50+25, 3×95+50, 3×120+70, 3×150+70, 3×185+95, and 3×240+120mm, explaining their structural characteristics, performance parameters, and applicable scenarios to demonstrate their precise adaptability in power transmission.​ These cables all adopt a multi-core collaborative design. "3×" clearly indicates 3 main cores responsible for primary power transmission, with the following number representing the cross-sectional area (mm²) of the core, and the specification after "+" corresponds to the neutral or ground wire, forming a complete power supply circuit. Taking 3×25+1×10 as an example, 3 main cores of 25mm² are responsible for transmitting electrical energy, and 1 auxiliary core of 10mm² ensures circuit safety, with a current-carrying capacity of approximately 80-100A, suitable for scenarios with concentrated equipment such as small air compressors and workshop lighting; the 3×50+25mm cable has a current-carrying capacity of 120-150A, meeting the power supply needs of medium-sized shopping mall central air conditioners and elevator group control systems; the current-carrying capacity of 3×95+50mm and larger specifications gradually increases, among which the 3×240+120mm cable has a current-carrying capacity of up to 400-500A, stably supporting the operation of high-power equipment such as steel mill rolling mills and large substation outgoing lines.​ In terms of core materials, high-purity copper (purity over 99.9%) or aluminum conductors ensure conductivity. The conductivity of copper conductors reaches 58MS/m, and that of aluminum conductors is about 37MS/m, significantly reducing transmission losses; the insulation layer uses XLPE (cross-linked polyethylene), which, after warm water cross-linking treatment, has a temperature resistance range extended to -40℃ to 90℃, with an insulation resistance of ≥1000MΩ·km and a breakdown field strength of ≥20kV/mm, maintaining stable insulation performance in humid and high-temperature environments; the sheath layer is made of PVC or polyethylene according to scenario requirements. PVC sheaths meet the acid and alkali resistance requirements of GB/T 2951.5, suitable for chemical industry areas; polyethylene sheaths have better flexibility, with a minimum bending radius of only 6 times the cable outer diameter, facilitating laying in narrow spaces. Some models, after adding flame retardants, pass the GB/T 18380.3 bundle combustion test, enhancing safety in fire environments.​ The application fields cover multiple scenarios such as industry, construction, and municipal engineering: small-specification cables are used for wiring from distribution boxes to terminal equipment in shops and office buildings; medium-specification ones are suitable for factory production lines and commercial complex main lines; large-specification ones become core components of industrial park transmission networks and high-rise building power supply main lines. The diversified specification combinations and performance designs enable them to accurately match different power requirements, providing reliable support for the efficient and stable operation of power systems.