How to connect wires with different cores of different metals?

Ivan asks:

Good evening! Today, we have an electrician repairing a damaged wiring site. I was somewhat alarmed that he connected the copper single-core wire with a stranded wire of silver-colored metal by twisting, although with one copper core in the center. What kind of wire could it be with one copper core and other steel-colored wires, and how safe is such a connection? Thank!

The answer to the question:

Hello! Maybe some shielded wire! And the veins can also be copper, but tinned, hence the silver-steel color! Call an electrician, give him a couple of kicks and over the head with a book "PUE", and tell us that the twist can not be used to connect the wires, according to paragraph 2.1.21 of chapters 2.1

And the connection of a wire with a multi-wire core with a wire with a monolithic core for any metals will be wrong, the contact will be bad, etc. In such cases, the wires are soldered, sleeves, but do not twist. This is even worse than twisting two monolithic veins among themselves.

You can read about wire connection methods in our article -https://my.electricianexp.com/en/sposoby-soedineniya-provodov-v-raspredelitelnoj-korobke.html

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