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Today, the vast majority of wires made of copper. That's only in old buildings and still come across the wiring of aluminum. It is dictated mainly by the fact that their power were created in times of shortage of the metal, and therefore used aluminum. All this can create a lot of difficulties in the organization of the functioning of electricity.
The crux of the problem
It is important to understand that the current-carrying conductors of copper and aluminum in any case should not touch each other. This should be considered for any method of connection of different cables. This is because copper and aluminum metals are aggressive with respect to each other. Under stress, in the case of the compound there is a chemical oxidation reaction, which leads to deterioration of current conduction. Subsequently, this "design" begins to warm more and more and become a fire hazard. It is for this reason that in any case, do not use for the connection of copper and aluminum usual twist!
1. crimping method
This method is often selected by professionals, because it has high reliability and durability. The main problem for the home masters is that crimping copper and aluminum wires requires a special tool - a manual hydraulic press. Held together by wires with special sleeves. They provide a durable contact. Of course, the people are craftsmen making molding ordinary hammer, it's just "not quite" right.
2. terminal blocks
The essence of this method is to connect the copper and aluminum conducting members at using a special metal strip from a neutral, non-reactive with either copper or with aluminum. Terminal blocks may be equipped for this clamping or bolting mechanism. This method is used when working with non-high-voltage power circuits.
3. bolted connection
This method is well suited for those who are engaged in electrical works at home alone and has nothing to do with this special equipment. If there was an urgent need to connect copper and aluminum wire, it can be done by means of nut and several washers. Most importantly, to separate the two hostile to each other metal.
Continuing the theme read that How to make a 3G / 4G antenna with a coverage radius of up to 30 kilometers and not only.
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A source: https://novate.ru/blogs/060219/49370/