How to make a branch for connecting an outlet?

Dmitry asks:
Good afternoon, I wanted to know if there is a cable coming from the electrical panel in the entrance from the fuses directly to the washing machine, is it possible to install a socket on this cable through another cable simply by twisting one with the other, both copper ones, have a different cross-section. Only a wi fi router will be connected to the outlet, no special loads are expected. I would like to know how safe and correct this is in terms of connection, thanks in advance)
The answer to the question:
Hello! Forget twisting. They can not be done (PUE 2.1.21.). Connect the wires with terminal blocks, welding or soldering. Otherwise, I do not see any contraindications. What power washing machine? If up to 3 kW, then you can use Wago terminal blocks, PPE caps, if more - then welding, soldering or sleeving is better.
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