The GFI is just not a magical bullet which will save you from damage – but it can help save your ass in some predicaments. (So I have two mounted at my workbench anyways…) In our knowledge it’s not unheard of to discover PSUs which can be only two-3 yrs https://lukasjdqaj.blogminds.com/how-power-supplies-refurbishment-can-save-you-time-stress-and-money-27999216