Such devices may exist, and people routinely make/use/sell adapters like that, but that doesn't make them safe or legal, and electricians aren't immune from that stupidity. When we were setting up at MICE, the company providing all the power supply to the individual stands had lots of very illegal and dodgy cabling that they had obviously assembled specially, and was even tested and tagged! Some examples were one of these:

(32 amp 3 phase socket)
.....with the switch removed and a second outlet fitted in its place, and the pair attached to a short length of cable to a 32A 3 phase plug. Instant double adapter, allowing a 32 amp circuit to be overloaded by drawing 64 amps. And they had whole crates full of these!



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