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Lots of houses burnt down, especially due to tenants hooking up 2kw electric heaters to these devices
I actually once met a fellow who thought that he could save money by connecting his heater to the lighting circuit. His logic was that the lights were only on a 5A branch circuit, so it would use less power! [Linked Image]

Adapters used to be sold in the U.K. too for connecting a 2-pin 5A plug to a bayonet lamp-holder, and vice versa. They were withdrawn from the market years ago.