please restate question.
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I did not ask about the geography.Klip,
Country of origin?
Wiring codes and methods can vary from country to country.
What might be a common method of wiring here in the USA may not be in your country.
Probably the most common type of residential branch circuit wire here in the USA is NM-B, (Romex trade name. Just one manufacture of type NM-B cable.) Is NM-B cable used in your country / town?
Sorry if you were offended by my asking......