1, single-core copper wire is suitable for indoor underground laying, outdoor short-distance overhead, large switch connection, power box jumper, etc. Features: good corrosion resistance, strong tensile strength, beautiful jumper molding and little influence by surge current.

2. Multi-core copper wire is suitable for places convenient for mobile operation, such as power supply lines, internal connecting wires, output of mobile power generation equipment, output of electric welding machines, etc. It is characterized by good flexibility and heat dissipation, and can alleviate the skin effect of alternating current.

Single-core and multi-core are both power lines, so we can't say which one is more suitable without specific application.