The current carrying capacity of the wire is a factor that must be considered in the design process. The load current value of the wire is specified in GB 4706.1-2005. The current carrying capacity of the wire is related to the cross section of the wire, as well as the material, type, wrapping method and ambient temperature of the wire. There are many influencing factors and the calculation is more complicated. The ampacity of various wires can usually be found in the manual.
The factors affecting the ampacity can be divided into internal factors and external factors. The properties of the wire itself are the internal factors that affect the current carrying capacity of the wire. Increasing the core area, using high conductive materials, using insulating materials with good high temperature resistance and thermal conductivity, and reducing contact resistance can improve the current carrying capacity of the wire. External factors can increase the current carrying capacity by increasing the wire arrangement gap and selecting an arrangement environment with suitable temperature.