Why copper and aluminum wires are not allowed to connect directly ？
Because the electrochemical properties of copper and aluminum are not the same. When they are directly connected, a battery effect is produced upon encountering moisture in the air to generate moisture to form an electrolyte. Aluminum tends to lose electrons and become a positive electrode. It is difficult for copper to lose electrons and become a negative electrode. Therefore, a small electromotive force is generated between the positive and negative electrodes, and an electromotive force generates a small current, corrodes the aluminum wire, causing poor contact, and the contact resistance is Increase.
When the current in the cable passes through the connection between the copper wire and the aluminum wire, the temperature rises, and the high temperature accelerates the corrosion of the aluminum wire. This creates a vicious circle that becomes more and more serious and eventually burns the wires.
How do you connect the copper wire and the aluminum wire? The copper wire and the aluminum wire must be connected in a transitional manner, which is the copper-aluminum transition pipe, the copper-aluminum transition wire clamp and the copper-aluminum transition wire nose connection that we usually use.
