The solid copper cables (with specifications of 1.5mm², 2.5mm², 4mm²) and 10mm² submersible cables introduced in this article all use high-purity electrolytic copper as the core conductor, featuring excellent conductivity and mechanical strength, and are widely applicable to power transmission needs in various scenarios. The 1.5mm², 2.5mm², and 4mm² solid copper cables adopt a single-strand solid copper conductor design, with a conductor purity of over 99.9%, ensuring stable current transmission and reducing line loss. Their insulation layers are made of polyvinyl chloride (PVC) or cross-linked polyethylene (XLPE) materials with excellent aging resistance and temperature resistance, which can withstand ambient temperatures ranging from -15℃ to 70℃, and have good acid-alkali resistance and wear resistance. These cables are mainly used in low-load scenarios such as indoor and outdoor lighting systems, power supply for small household appliances, and wiring for office equipment. They offer flexible installation methods, including surface mounting, concealed laying, or pipe threading, meeting the needs of different decoration environments. The 10mm² submersible cable is a special cable designed specifically for underwater operation equipment. In addition to using high-purity solid copper conductors to ensure conduction efficiency, its insulation layer and sheath are made of special rubber materials that are water-resistant, oil-resistant, and UV-resistant, with excellent waterproof performance (waterproof grade up to IP68), enabling stable operation in long-term immersion environments. The cable also has high mechanical strength, capable of withstanding the instantaneous high-current impact when the submersible pump starts, while being resistant to stretching and twisting, adapting to complex underwater installation environments. The 10mm² cross-sectional specification allows it to carry high-power submersible pumps (usually applicable to equipment with power ranging from 5.5kW to 7.5kW), widely used in agricultural irrigation, aquaculture, deep well pumping, municipal drainage and other fields, providing safe and reliable guarantee for underwater power transmission. Both conventional solid copper cables and special submersible cables are produced in strict accordance with the International Electrotechnical Commission (IEC) or relevant national standards, and have undergone multiple quality inspections such as pressure resistance testing, insulation resistance testing, and aging resistance testing to ensure safety and stability during use. Selecting the appropriate cable specifications according to different application scenarios can not only improve power transmission efficiency but also extend the service life of equipment and reduce maintenance costs.