1. Maximum withstand current: defined as the current that can be loaded before the conductor or insulator melts. The heat generated by the current flowing through a conductor will determine how much current this wire can carry. The current that can flow through a single core bare copper wire can continue to increase until the generated heat reaches the melting point of copper.
2. Conductor size: The larger the cross-sectional area of the conductor, the greater the current it can carry.
3. Insulator: The heat generated by current should not exceed the maximum applicable temperature of the insulator material.
4. Environmental temperature: The higher the environmental temperature, the less heat is needed to reach the maximum applicable temperature of the insulator material.
5. Number of core wires: The more core wires in a wire with the same cross-sectional area, the less likely it is to dissipate heat.