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During the renovation of an apartment located in a panel house, there is a need to replace the electrical wiring. But replacing the wiring in the apartment is not enough! It is necessary to change part of the wiring from the floor panel to the apartment. There are two ways. First. Lay the cable openly, in a corrugated pipe or cable channel. Second. Use existing channels, cavities and niches for laying. This video talks about how to find existing channels.