The copper earth cable introduced in this article is a professional cable product specially designed for electrical grounding systems. Its cross-sectional specifications range from 2.5mm² to 50mm². It uses high-purity copper as the conductor, with a PVC insulation layer wrapped around the outside. The wire body is green and yellow, with a rated voltage of 450/750V. It is widely used in grounding devices of various buildings, industrial facilities and electrical equipment, providing key protection for electrical safety.​ In terms of conductor material, the selection of high-purity copper is the core advantage of this cable. Copper has excellent electrical conductivity, especially in grounding systems, which can quickly conduct fault current or static electricity into the earth, avoiding potential safety hazards caused by charge accumulation. At the same time, the copper conductor has good corrosion resistance and ductility. After special processing, it can maintain stable conductivity and structural integrity even in humid, dusty and other complex environments, prolonging the service life of the cable.​ In the design of the insulation layer, the application of PVC material provides reliable electrical insulation protection for the cable. The PVC insulation layer can not only effectively block current leakage, prevent interference between the grounding system and other circuits, but also has certain wear resistance and aging resistance, adapting to different installation environments. The green and yellow wire body design is an internationally accepted grounding mark, which can clearly distinguish the grounding cable from other wires, facilitating identification and installation by construction personnel and reducing the risk of misoperation.​ In terms of specifications, the cross-sectional range of 2.5mm² to 50mm² enables it to meet the grounding needs of different scenarios. The 2.5mm² small-section cable is suitable for light-load grounding systems such as small electrical equipment and household circuits; while the 50mm² large-section cable can be used in heavy-load grounding scenarios such as large industrial equipment, substations, and high-rise buildings. It ensures that in the event of a short circuit and other faults, large currents can be quickly conducted into the earth, protecting equipment and personnel safety.​ In the field of application, this copper earth cable has become an important part of the electrical grounding system due to its reliable performance. In the construction field, it is used for lightning protection grounding and protective grounding of buildings, conducting lightning current or equipment leakage into the earth to ensure the safety of buildings and internal facilities; in the industrial field, it is often used for grounding of factory production line equipment and large machinery to prevent accidents caused by equipment leakage; in the power system, places such as substations and distribution rooms are also inseparable from it, providing grounding guarantee for the stable operation of power equipment.​ The design of rated voltage 450/750V enables it to meet the grounding requirements of most low-voltage electrical systems, and is compatible with common electrical equipment and grounding devices, simplifying the design and installation process of the system. Whether it is the laying of grounding systems in new projects or the transformation and upgrading of old systems, this copper earth cable can provide a safe, stable and efficient grounding solution, and is a key component to ensure the safe operation of electrical systems.