Direct connection of copper wire and aluminum wire is generally not allowed. Why ?

Because copper and aluminum have different electrochemical properties. When they are connected directly, the battery effect will occur once they encounter moisture in the air and form an electrolyte. Aluminum is easy to lose electrons become positive, copper is difficult to lose electrons and become negative, so between the positive and negative poles will produce a small electromotive force, electromotive force will produce a small current, corrosion aluminum wire, cause bad contact, contact resistance will increase. When the current in the cable passes through the copper wire and aluminum wire connection, the temperature rises, which in turn accelerates the corrosion of aluminum wire. It's a vicious cycle that gets worse and worse and eventually burns the wire.

So how do you connect copper wire and aluminum wire? Copper wire and aluminum wire must be taken transition connection, that is, we usually use the copper and aluminum transition connecting pipe, copper and aluminum transition clamp and copper and aluminum transition line nose connection. If small section copper wire and aluminum wire connection, the copper wire should be lined with tin and then connected with aluminum wire.

Copper, as a common metal copper material, has good corrosion resistance. Under the influence of external disturbance and humidity environment, copper wire mesh material can be used well and long term. In addition, copper is also a kind of alloy filament products. It has a strong service life.