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Big cables.
Aha.
I’m not sure where you are or what the nominal voltage is
Sweden, 230V. Not totally uncommon to have 3-phase 380V outlets for heavy duty stuff in peoples garages here. I don’t have any opinions about electricity at all, just that you seemed to find the arrangements here strange/interesting. I know UK plugs have little fuses in them as well, ours don’t.
russmeyer-
I did the same thing as @Nef when I saw your post. It would be very unusual to have 3 phase in a domestic setting in the UK. I've seen it in 6 storey houses in Mayfair but it immediately spilts to separate single phase distribution boards.
Our plugs have fuses to protect the cable between the plug and accessory, otherwise an overcurrent fault could cause the cable to overheat and catch fire. I think the UK is unusual in this respect but don't know why it's not normal elsewhere.
Airhead
Big cables. 10mm twin and earth will carry 64 amps if clipped direct (not surrounded by insulation etc), which is 14kw at 230v. Plenty for a big shower etc.
I’m not sure where you are or what the nominal voltage is, but the issue is that if you get a shock between phases, you could get 400v through you, and that would be bad.