Thanks to all of you guys!
Really clear and detailed answers. This allows me to move forward and understand that I need to be interested in power conditioners before thinking of buying new AC power cables. Especially since for my two installations at home I did not notice any interference.
So I ask you the following question: do you have any recommendations with a limited budget for power conditioning (best value for money)?
@Nick_Mimi @Polygonhell @Marzipan @db_Cooper @MazeFrame @Deleeh @Ahobaka
But since this is a new question, I think I should post-it in a new discussion. So I invite you to continue the discussion if you are interested here: About Power conditioner : recommandation?