HOW do you know???that is some kind of bell or thermostat wire
Construct, you are doing a LOT of guessing.
I'll ask again. Do you know what type of wiring they use in Europe/Asia???
If not then DON'T guess.
Who said ANYTHING about BX romex or thhn??? I'm almost sure they don't use that over there, but I won't guess and make replies that may cause more trouble than good.