What kind of wire can be laid without a corrugation hidden?

Any. Hidden wiring allows you to preserve the aesthetics of the design of the room. Its essence lies in the fact that the cable hides inside the wall or hides under the ceiling. For convenient location of the cable inside the wall, strobes are pre-created. The width of these grooves should correspond to the thickness of the cable, but not be less. With hidden cable laying, they do without corrugation, since it is much more difficult to make furrows under it. In addition, corrugation for hidden wiring is not required at all.

After fastening the wiring, plaster is applied on top and finishing the finishing work is completed. It is very important to mark the electrical network before starting installation work.

Thus, answering the question of which wire can be laid without corrugation, we can conclude that corrugation is not a prerequisite for the installation of a protected cable. It should be used only in special cases specified in the regulatory documentation. If the requirements for electrical safety are met, as in the case of hidden wiring under plaster, then it is not necessary to use corrugated pipes. But in cases where the cable does not have a special shell that does not support combustion, and the laying is carried out in an open way, the presence of a corrugation is a prerequisite for fire safety requirements.