This abstract covers electric wires and cables including models such as NYY, NYM, and VGV, with common specifications of 3×1.5mm², 3×2.5mm², 3×4mm², and 3×6mm², which are suitable for various power transmission scenarios. NYY cables are power cables with cross-linked polyethylene insulation and polyvinyl chloride sheathing. They have good corrosion resistance and mechanical strength, and are suitable for fixed laying, such as concealed laying in buildings or direct underground burial. NYM cables are light-duty polyvinyl chloride insulated and sheathed cables with good flexibility, often used in home wiring, connection of small electrical appliances and other occasions. VGV cables belong to rigid sheathed cables with strong impact resistance, and are mostly used in industrial equipment, outdoor power facilities and other environments with high protection requirements. In terms of specifications, 3×1.5mm² and 3×2.5mm² cables have moderate current-carrying capacity, suitable for low-power electricity scenarios such as home lighting and ordinary sockets; 3×4mm² and 3×6mm² cables have larger current-carrying capacity, which can be used for high-power electrical appliances such as air conditioners and electric water heaters, or power supply for small power equipment. All these cables meet relevant safety standards and can ensure the stability and safety of power transmission.