this post was submitted on 18 Oct 2025
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You may not like it but this is what the perfect mains plug looks like /j

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[–] purplemonkeymad@programming.dev 9 points 19 hours ago (2 children)

Live and neutral are typically not interchangeable. fuses should be on the live cables so that over current is stopped on the way in. Plugging in the wrong way means that a blown fuse might stop current, but the device could still be at live voltages and be dangerous.

[–] fullsquare@awful.systems 8 points 18 hours ago (3 children)

that's why you put fuses in central fuse box, not in the plug. appliances should be designed in such a way that it shouldn't be a problem. nobody else does this because it's not necessary if your installation is sanely built

[–] witty_username@feddit.nl 7 points 18 hours ago (2 children)

This is the reason why uk home electrical wiring has fuses everywhere. It is a safety measure that mitigates other problems like poor design and bad installation practices

[–] sauerkrautsaul@lemmus.org 2 points 16 hours ago

its not, it was put into place due to copper shortages during ww2

[–] fullsquare@awful.systems 2 points 17 hours ago

more like papers over poor design informed by ww2 shortages

[–] piccolo@sh.itjust.works 2 points 14 hours ago* (last edited 14 hours ago)

appliances should be designed in such a way

Such as... putting a fuse in the appliance making repairs more difficult. A breaker box stops extreme overcurrents, but a measly 0.5 amps could still cause a fire.

[–] prex@aussie.zone 4 points 17 hours ago (1 children)

A fuse/breaker at the fuse box needs the current capacity for all, or at least most devices on at the same time. The individual fuses can be rated much lower.

[–] fullsquare@awful.systems 4 points 17 hours ago* (last edited 16 hours ago) (1 children)

uk fuse in fuse box can't be sized properly because old uk installations used ring circuits in order to save copper during ww2 shortages, everybody else has this problem sorted out by now (initially by using aluminum wiring, or waiting for more copper). modern wiring is arranged in star-type topology with a few outlets per leg, and it can be fused properly, but the far out parts of circuit don't transmit power at all times which is why it was looked down upon during shortages

example would be 16A circuit that has 5-10 16A outlets, has wires suitable to carry 16A and 16A fuse. it's okay because you're not expected to draw full power at all outlets at the same time, and most of the time much less than that. if you do and you know it in advance you're expected to split it over more circuits, or make it bigger. uk ring circuit would have wires that carry only 8A in each direction, and fused 16A. it can fail in a way where one side disconnects, but the other side becomes overloaded. plug fuses are for protection of these shitty circuits from shortcircuit in appliance

[–] prex@aussie.zone 1 points 1 hour ago

Do UK ring circuits rely on a single breaker at the fusebox? I assumed that they would have a breaker for each leg of the ring (8A + 8A in your example).
That sounds really dangerous as a cut ring would be fused at double the current capacity of the wire. Would the wire in your example be rated at 8A or 16A?
I have little to no knowledge of the UK power setup but have heard that its meant to be pretty safe. What am I missing?

[–] rtxn@lemmy.world 4 points 17 hours ago

Polarized live/neutral is still insane to me. All it takes is one cheap electrician or overconfident DIY to introduce a potentially lethal false sense of security.