This article focuses on CV cables and XLPE cables, highlighting their various wire diameter specifications, material characteristics, applicable scenarios, and related advantages.​ In terms of wire diameter specifications, both types of cables cover a variety of specifications such as 3.5mm², 5.5mm², 8mm², 14mm², 22mm², 30mm², and 38mm². The smaller wire diameters of 3.5mm² and 5.5mm² are suitable for low-power power transmission scenarios such as household small appliances and lighting circuits; 8mm² and 14mm² can meet the needs of medium-power applications such as small industrial equipment and commercial store electricity; larger wire diameters like 22mm², 30mm², and 38mm² are capable of adapting to medium and high-power power transmission such as large industrial machinery, main building power supply, and municipal power trunk lines. The rich specifications provide precise options for different scenarios.​ In terms of materials and performance, CV cables and XLPE cables have their own highlights. When XLPE (cross-linked polyethylene) is used as an insulating material, its molecular structure forms a three-dimensional network, which not only has high insulation resistance to effectively prevent current leakage but also has excellent heat resistance, maintaining stable performance in high-temperature environments. It also has excellent mechanical strength, with strong tensile and impact resistance, greatly reducing the probability of failures caused by external environmental influences and reducing losses during current transmission. CV cables, on the other hand, excel in flexibility and corrosion resistance, being able to adapt to complex laying environments, especially in humid and chemical-rich places, while still maintaining good operating conditions.​ The application range of both cables is wide, covering scenarios such as the connection between equipment and power sources in industrial power distribution systems, strong and weak current wiring in buildings, street lamp power supply in municipal engineering, and underground pipeline power transmission. They play a key role in the transmission and distribution of electrical energy, providing stable and reliable power connections for various electrical equipment and facilities such as factory production lines, air conditioning systems in commercial buildings, and power supply networks in residential communities.​ In addition, both are convenient in installation and maintenance. Due to their material properties, their laying methods are flexible, allowing for surface mounting, concealed installation, or underground laying. The later maintenance cost is low, and troubleshooting and replacement are relatively simple when failures occur, further improving their cost-effectiveness in practical applications.​ In general, CV cables and XLPE cables, with their diverse wire diameter specifications, high-quality material performance, wide range of applicable scenarios, and convenient installation and maintenance features, occupy an important position in different power transmission fields, providing a solid guarantee for the safe, stable, and efficient operation of power systems.