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Just been testing a wild house up here. 18 consumer units in the place. 3 phase, 400V potential in some rooms. Mostly installed by a fairly wild maintenance man with questionable qualifications.
He retired at 80ish and didn’t tell anyone how any of it worked. Lots of mad RF switching and controls, age of the installation ranges from newish to 50+ years old.I think the vast majority of it needs condemned.
Other lols include full bullet proof glass throughout, every internal door is a lockable safety door, and about a million cameras everywhere.
Nef
konastab01
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.