Why does copper wire have better fire resistance than aluminum wire?

Why does copper wire have better fire resistance than aluminum wire? Copper wire has been used in power supply systems for over a hundred years, while aluminum wire was not widely used until the mid-20th century. Although aluminum wire is cheaper than copper wire, copper wire cannot match aluminum wire in terms of fire resistance. What is the specific reason?
Firstly, the conductivity of copper wire is higher than that of aluminum wire. This is because the electrical resistivity of copper is only half that of aluminum, and the high or low electrical resistivity is one of the important factors affecting the wire loss rate. That is to say, under the same voltage and current conditions, the line loss of copper wire is smaller than that of aluminum wire, which can effectively save electricity. The use of copper wire makes the power supply system more efficient, not only reducing maintenance costs, but also minimizing energy losses during transmission. Secondly, the thermal conductivity of copper wire is superior to that of aluminum wire. Under identical conditions, the critical temperature of copper wire is nearly 10 degrees higher than that of aluminum wire, which can reduce the risk of fire caused by overheating. The thermal conductivity of copper wire enables the heat received by cables or equipment plugs to be quickly conducted to the surrounding environment, lowering the temperature and ensuring the safety of electrical equipment operation.  
In addition, copper wire not only has excellent conductivity and thermal conductivity, but also is more stable in physical and chemical properties than aluminum wire. Copper is a metal that is not easily oxidized and can form a dense oxide film in the atmosphere, thus having strong corrosion resistance. In a humid environment, aluminum wire will first oxidize, forming an oxide layer, which increases the electrical resistance and subsequently raises the temperature, which can easily cause cables and equipment to catch fire. Therefore, copper wire performs better in terms of moisture resistance, corrosion resistance, and high temperature resistance. In summary, copper wire is superior to aluminum wire in terms of fire resistance due to its high conductivity, thermal conductivity, and good resistance to fire, corrosion, and high temperatures. In the field of electrical engineering, copper wire has great advantages in terms of safety, stability, and service life. Therefore, for some places with high quality requirements such as hospitals, power companies, subways, etc., copper wire has been widely used.
Using high-purity oxygen free copper as the core to prevent overload, and using independently developed environmentally friendly materials as insulation, greatly reduces the risk of leakage and short circuit, providing multiple protections for you and your family. Only cables that meet national standards can truly ensure our life safety. We must not have a lucky mentality. Once an accident occurs, we regret it deeply!