I have gone through this answer on Superuser, while it provides good information, I still have a specific question from electrical/electronics engineering point of view.
Is it wrong and unsafe to connect the other end of the ESD wrist strap to the ground point on the wall socket?
What harm can it do and if it’s wrong, why?
I was watching a Youtube video about assembling computers by a user who seems to be a professional and he says he has been in the business for over 2 decades.
The video discourages connecting ESD strap to wall socket ground, it also says that when you connect ESD strap to metallic part of cabinet, remove the power plug from the PSU. However except a reasoning that you could get electrocuted with such a setup, no further technical explanation is given.
I have worked in an IT company that was TL9000 quality certified. This standard demands ESD protection deployment wherever necessary. All relevant test benches there had ESD mats connected to common ground. All terminals had a point to plug the ESD strap’s other end and all those were connected to ground and eventually going to the earth pit. So discouraging ESD strap connection to wall socket ground (that ultimately goes into the Earth pit) is a totally new concept to me.