Why can not connect directly to copper and aluminum wires in the wiring?

Why can not connect directly to copper and aluminum wires in the wiring? The answer to this question lies in a few nuances, which we will analyze below.

Firstly aluminum and copper is first of all metals that have different characteristics with respect to heat. As we know, the molecules of any metal when heated have to increase the property hence they are physically expand

If we connect the aluminum wire with a copper and let an electric current through them, they will expand quite differently, in consequence of which contacts each other quickly weakened. Because of the loose connection formed by strong heating, which may cause arcing and then ignited.

To avoid this, you can not connect the wires directly to each other, and with the help of bolts washers and nuts. To do this, use the pliers bend the wire ends into the hook. Further, in one of the bent wires prosunte suitable for bolt diameters and fling it two washers of suitable size. Further throws on second wire washer, the top and another washer good anchoring nut.

All designs are to the two wires of different metals were not in contact with each other directly, and have been well documented. Will only a good place to insulate the connection and you can be sure that it will last you for years to come.