The advantage of copper wire:
The resistance of copper wire is smaller. The aluminum resistivity is 1.68 times higher than that of copper cable. The copper conductivity and thermal conductivity are better than that of aluminum wire.
Copper wire price is higher than aluminum.
The advantage of aluminum wire:
Aluminum price is cheaper and economical.
Aluminum cable is light, the aluminum cable weight is 40% of copper cable weight, so the cost of construction and transportation are low.
Resistance to oxidation and corrosion: aluminum reacts with oxygen in the air to form an oxide film that prevents further oxidation, so aluminum wires are widely used for high-voltage, large-section and large-span overhead transmission.
The disadvantage of aluminum wire:
The mechanical strength of aluminum wire is poor, and the aluminum wire is easy to oxidize at the end of the connecting line, which will lead to the temperature rising, which is the main cause of failure (power off or line breaking).
Aluminum wire has low conductivity, high electrical loss, poor tensile strength, low corrosion resistance, and easy oxidation of joints.
Each metal material has its own characteristics. Copper wire and aluminum wire have their own advantages and disadvantages, and their fields of use are also different. Aluminum wire is more suitable for high-voltage lines.In the household wire, the copper wire has the obvious advantage than the aluminum wire.