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Is it OK to leave device chargers plugged in all the time? An expert explains
(theconversation.com)
This is a most excellent place for technology news and articles.
As someone who just moved into a 1965 house - yep, plugs absolutely wear out. These are some sloppy bois.
Around here, people usually have to replace the wiring in such old houses, since they tend to only have two wires (i.e. no PE). But the Schuko sockets themselves are most likely fine.