Screw air compressor manufacturers tell you what to pay attention to in the mixed connection of copper and aluminum wires

We all know that copper wire has a better effect than aluminum wire. Copper wire of the same area has a larger load and lower resistivity than aluminum wire. The stability of the copper wire is better. However, the price of copper wire is many times higher than that of aluminum wire.

So many people choose to use aluminum wire in order to save money, but for high-power mechanical equipment such as air compressors, we still strongly recommend using copper wire!

Can copper wire and aluminum be directly connected? Of course not.

The chemical and physical properties of copper and aluminum are very different and should not be directly connected.

However, copper-aluminum connection is inevitable.

When connection is required, copper-aluminum transition clamps, copper-aluminum transition joints, copper wires or aluminum wires are usually connected directly after enamelling.

Because the electrochemical properties of copper and aluminum are different.

If they are directly connected, once they encounter the electrolyte formed by water, carbon dioxide and other impurities, a chemical battery is formed.

This is because aluminum is easy to lose electrons and become a negative electrode, and copper is difficult to lose electrons and become a positive electrode. Therefore, an electromotive force of 1.69V is formed between the positive and negative electrodes, and a small current passes through, corroding the aluminum wire, which is the so-called electrification. corrosion.

This will cause poor contact between copper and aluminum and increase contact resistance.

When a current flows, the temperature of the joint will increase, and the temperature will increase and accelerate the corrosion of the joint, increase the contact resistance, and cause a vicious circle until it burns out or even causes a fire.