I don’t know about US plugs, but British plugs have an inbuild fuse to protect from power surges. When a surge happens, the fuse burns and protects whatever electronic device it’s attached to. But then the fuse must be replaced for the plug to work again. If you see someone “work on” a plug, 99% of the time that’s all they’re doing. It’s a 10 second job that even a layman can do.
When I was in school (2001-2006), Wiring a plug is also taught to kids in school as part of Design and Technology.
UK plugs also have a large Earth which makes them much much safer than US or European plugs.
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