On Sat, 25 Jun 2022 09:34:57 +1000, Animal <
tabb...@gmail.com> wrote:
> On Friday, 24 June 2022 at 10:35:12 UTC+1, Scott wrote:
>> On Thu, 23 Jun 2022 15:21:28 -0700 (PDT), Animal <
tabb...@gmail.com>
>> wrote:
>>
>> >On Thursday, 23 June 2022 at 09:49:30 UTC+1, Scott wrote:
>> >> On Wed, 22 Jun 2022 11:18:05 -0700 (PDT), Animal <
tabb...@gmail.com>
>> >> wrote:
>> >> >On Wednesday, 22 June 2022 at 10:20:06 UTC+1, The Natural
>> Philosopher wrote:
>> >> >> On 22/06/2022 10:07, jon wrote:
>> >> >> > On Wed, 22 Jun 2022 09:52:14 +0100, Commander Kinsey wrote:
>> >> >> >
>> >> >> >> Why did the UK change from round pin to square pin plugs?
>> Fuses and
>> >> >> >> sleeves could have been added to the round ones just as easily.
>> >> >> >
>> >> >> >
>> >> >> > To keep people in work.
>> >> >> No. Because it is easier to manufacture a true pair of self-wiping
>> >> >> contacts that cover a wide area, against a flat bar, than against
>> a
>> >> >> round pin.
>> >> >>
>> >> >> the 13A design was all about safety, not jobs for the boys. That
>> came
>> >> >> later, with the labour governments.
>> >> >
>> >> >There were multiple reasons for the move to BS1363 square pin
>> system.
>> >> >The old round pin system was recognised in the 40s to be thoroughly
>> inconvenient, inadequate for increasing numbers of appliances, unsafe
>> and frankly insane. It was a whole pile of unnecessary problems by
>> design, plus there were lots of unsafe plugs, sockets, adaptors etc in
>> use.
>> >> >
>> >> >At the heart of the square pin system was the ring circuit. It
>> enabled unlimited sockets to be fitted on just one ring of cable, on 1,
>> 2 or 4 fuses. This was a huge money and material saving over a round
>> pin radial setup with the same number of sockets, which mattered after
>> the war. Also old 15A radials could be upgraded to add unlimited
>> sockets relatively cheaply.
>> >> >
>> >> >To put existing round pin plugs on such circuits is not safe. A
>> lamp with a bellwire or speaker wire mains lead on a 2A plug & socket
>> on a 32A fused ring is not ok. If the same sockets were used, this
>> would be the inevitable common result. A different plug system was
>> needed.
>> >> >
>> >> >The new plug system was designed to be far safer than the crazy
>> round pin system. It also had the desired effect of gradually taking
>> all those round pin hazards out of service. If you've ever used round
>> pin kit you'll know how bad it often was. Kicking plugs to get the pins
>> to make contact was common practice for example. There were wooden
>> plugs & adaptors, some with touchable live tubes. Irons & heaters on BC
>> plugs were common etc.
>> >> >
>> >> >IMHO it's time today to revisit the system to improve it a bit. 2
>> pin BS1363 variant moulded-only plugs could be added, enabling use of 3
>> appliances per single faceplate, 4 or 6 per double.
>> >> I don't disagree with what you say. I like the system.
>> >>
>> >> However, if the argument was as persuasive as this, why did other
>> >> countries (with minor exceptions) not follow and why is Schuko and
>> its
>> >> variants so widely used today?
>> >
>> >The ring system has clear advantages on cost & safety, yet close to
>> no-one outside the UK understands how it works or what its upsides are.
>> I find that strange but there it is.
>> >Our plugs are bulky compared to most countries, and using radials they
>> don't need the plug fuse, so ours don't suit radial systems
>> particularly well. And ours are a hazard to feet.
>
>> I am still finding it difficult to follow the concept of radial
>> circuits. If there are 10 sockets in the kitchen, does each have its
>> own cable run to the consumer unit and its own fuse there? Do all the
>> cables run in a single conduit of does each run separately? This
>> would require a maze of cabling and a vast number of fuses.
>>
>> I suppose the way round it would be to have one main socket and lots
>> of extensions, but this would be less safe than our system. How would
>> the user know which was the main socket for high current appliances?
>> Two appliances could bring down a 16 amp fuse.
>
> Take a look at a domestic American 'breaker panel'. Yep, they have a ton
> of breakers.
> I think they get 2 or 3 sockets per radial, but not sure on that point
It is nothing like that low.