Electric wires are generally used as conductive metal wires to carry current. There are various forms such as solid, twisted, or foil woven. According to insulation conditions, it can be divided into two categories: bare wires and insulated wires. A cable is an insulated wire composed of one or more insulated conductive cores placed in a sealed sheath. It can be covered with a protective layer for transmitting, distributing electrical energy, or transmitting electrical signals. The main difference between it and ordinary wires is that the cable size is larger and the structure is more complex. The difference between wires and cables is that wires are generally smaller in size and have a simpler structure, but sometimes cables are also classified as general wires. A cable is composed of one or several insulated wires, with a tough outer layer made of metal or rubber. Cables and wires are generally composed of three components: core wire, insulation sheath, and protective sheath. The characteristics of commonly used cables are as follows: CEF - ethylene propylene rubber insulated chloroprene rubber sheath, flame-retardant power cables for ships. CVV - PVC insulated and PVC sheathed flame-retardant power cables for ships. By the way, the advantages of cables are small insulation distance between lines, small footprint, underground laying without occupying space above ground level, unaffected by environmental pollution, high power transmission reliability, and minimal interference to personal safety and the surrounding environment.