Connecting copper and aluminum wire with a regular twist is the worst idea you could think of. Such a connection will not last long, and ultimately it can also start a fire in the room. If you need to connect aluminum and copper wires to each other, you will have to resort to other "special" techniques. By the way, here are all of them.
1. Bolting
The simplest "household" way to connect aluminum and copper wires. To implement it, we will definitely need three washers and a nut. The essence of this simple method is to prevent copper and aluminum from contacting each other, but at the same time to ensure the transfer of electrical power between them by introducing an additional element. True, the bolted connection has one big drawback - it is cumbersome. It's not always possible to push this into a junction box.
2. Compression connection
The principle of this method is fully consistent with its logic described above. The only difference is in the materials used. Here special stamped plates with grooves and meta for screws come to the rescue. This connection is designed to serve faithfully for a long period of time. It can withstand high currents, and most importantly, it is placed in a dielectric (plastic or rubber) case. The disadvantage is the same - cumbersome.
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3. Connecting terminal blocks
There are screw and screw terminal blocks. The most important thing when choosing this consumable is to pay attention to what material the clamping elements are made of. In our case, they must be steel, not brass. It is best to use clamping blocks, as no additional tools are required to connect them. In general, this method has only advantages, the pads also do not take up much space.
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And also: connection with combined sleeves
One of the most compact ways to connect wires made of conflicting materials. The tube has two ends: one is made of copper, the other is made of aluminum. There is a steel partition between them. Each wire is inserted at the end of its material, after which it is necessary to crimp the contacts with a special tool. This, by the way, is the main problem, since a crimping tool (crimper) costs money. If you want to know even more interesting things, you should definitely read about how to assemble with your own hands a simple induction heater. A source: https://novate.ru/blogs/240320/53898/