@VladB100 

Hi,

It's impossible to predict whether it will work or not.

If the socket in the underground parking goes through your apartment's electricity meter (i.e. the electricity used from that particular socket is directly charged to your personal electricity bill), then you might have a chance.

But if the electricity drawn from that socket in the underground parking is charged as general expenses of the whole apartment building, then don't even think about using Powerline, because then the socket is most probably not the "same power circuit".

Powerline adapters up to AV1000 usually only require power (L) and neutral (N), while Powerline adapters AV1300 and up use all three wires (power, neutral, ground), which is usually indicated by the term "2×2 MIMO" in the specs.