While I'm not familiar with Italian electrical regulations and I don't think we have any Italian experts on these boards, I would strongly suspect that it does require certification.
In most countries there are far tougher regulations applied to anything that is designated as a "work place" than than would be applicable to DIY work that you carry out in your own home.
I would strongly suggest that you seek local advice in Italy as you could walk yourself into a whole lot of legal and insurance issues if you don't carry out work in any work/office/industrial environment in accordance with local regulations.
