I'm going to exhibit at an expo and have been advised that all electrical equipment I use must be tested and tagged. And they will have someone there during setup that I can pay to do it if it's tagged. I don't know much about it to be honest but suspect the whole test and tag thing is a massive crock of ****.

Apparently anything running from mains power must be tagged. So I will need to get phone charger, laptop power supply, monitor power cord, some lights (12V but the 12V tranny is a plug-pack into 240V so needs to be tested apparently), the charger for my 4G wireless internet thingo, some extension crs and god knows what else tagged. This is all gear that is less than a few years old and that I have used in airports, government buildings, my own office, at home etc without ever thinking "this could be about to kill me".

Does anybody know why I need to employ test and tag procedures to eliminate the risk of these products being faulty when I use them in some paces but not others?

Can I buy tags off ebay and tag stuff myself (legally)? I know how to use a multi meter and visually inspect if something looks dodgy.

What will they try to charge me per device if I pay these thief's running the expo to do it for me?