In our country, it is just 'wiring', 'house wiring' or 'electrical wiring': it is always within the walls.
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khoshtip And if you like, you can name it 'wall embedded wiring', I think.I think this should have a hyphen: "wall-embedded wiring". While it is intelligible, there are too few Google hits to convince me that this is really a known term. The best I can think of is "concealed wiring".