- 11 Jan 2004
- Reaction score
I think hager do use countersunk threaded machine screws
A term often used for a Ring Final circuit. But looking at this Static Caravan board, it was used by manufacturers as well. No wonder Joe Public gets confused...
Talking of confused, this 4 way strip from the same 'van has 13A embossed on every outlet...
Although you frequently quote those figures, and although they seem to make very reasonable sense as a 'rule of thumb', I don't think anyone has ever seen them in writing, have they? Logically speaking, if there is such an officially-accepted 'formula', one would probably expect essentially the same 'formula' to also apply to a 32A radial circuit - have you heard that suggested?The ring final is rather a special system with special rules which allows us to use some predetermined figures. ... In spite of having a 32A MCB we calculate at 26A that 20A at centre and 12A even spread across the ring.
I can't think of any real reason why anyone would design a 2.5mm² ring protected by a 20A OPD, since the whole point of a ring final is that the regs give a special dispensation to allow the use of smaller CSA cable than a 30/32A OPD could normally protect. If VD (or EFLI) would be a problem with a 20A 2.5mm² radial, then one would presumably design with higher CSA cable, rather than change it to a ring, wouldn't one?As we drop the MCB size the 20A remains so using a 20A MCB we only reduce the current rating by 6A not 12A. So reducing the current does very little to the volt drop which is the limiting factor.
Beg to differ. Many DIY folk call Ring Finals Ring Mains and many DIY folk think that each 3 pin outlet is rated at 13A.
What I'm saying is that it is not surprising that people get the wrong idea when manufacturers mislead this way.
They do, but it doesn't result in any confusion - we all know what they mean. The same when they talk about 'bulbs', 'plugtops', 'plug sockets','low voltage lights' or 'transformers' etc. etc.
Those outlets in the picture probably are 'rated at 13A', aren't they?....and many DIY folk think that each 3 pin outlet is rated at 13A.
It's hard to disagree with that. The ideal would obviously be for everyone to use 'correct terminology' (as determine by someone!) and Joe Public cannot be blamed for taking his cues from what terminology manufacturers, wholesalers and retailers use. Mind you, it doesn't help when the industry itself uses questionable terminology (like 'continuity testing' for a quantitative measurement!)!What I'm saying is that it is not surprising that people get the wrong idea when manufacturers mislead this way.
Since we're being pedantic, even "ring finals" (which is what most electricians seem to call them) is actually sloppy (aka 'incorrect') terminology - it should be "ring final circuits".
So long as electricians persist in referring to quantitative low resistance measurement as 'continuity testing', I will reserve judgement on that one!What a ridiculous attitude but it explains a lot.
So you have extrapolated my saying that I don't think it's important whether the public calls ring finals ring mains, because it leads to no confusion, to me saying I see no requirement for any form of education?
Clearly, that is not what I have said.
Thanks for the insult by the way.
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