Ring mains? Is this true?

[i=p/u]

nah, they have cut off lables of maybe 40 ciruits, just a big bunch of brown/blue/green cables sitting, lowsey in one sense

 

[highspark]

In most kitchens you have a microwave, toaster and kettle on one side and on the other washing machine, tumble drier and dishwasher etc. I just split them down each side of the room! 20A 2.5mm radials

 

[i=p/u]

well i put them all on there own circuit, to minimize the forever comming fazult

 

[ackbarthestar]

Hi guys,
I have Hurd a few times now that ring mains will soon be fazed out due to the risk of danger if the ring is split! Is it now advisable to just install radial circuits?

Thanks for your help

Yep I've noticed that the story of rings go round and round, but good grief, I wouldn't want anybody splitting my ring !

I would suggest this is anti-ring propaganda, since the amended regs continue to recognize them, albeit given a new number to distinguish them from the harmonized numbering system. They will, no doubt, be forgotten by the uninitiated and those employed in basic domestic installations, with the use of double pole RCBOs, radials supplying dedicated appliances, reduction in the loading of sockets, ease of wiring and testing.

But never forget, ring final circuits are a useful circuit design method for reducing volt drop on long runs, and will continue to be used by designers who actually understand their principle of operation.....

 

[djlander]

Same old story that comes around on a regular basis, and normally started by the incompetent, who neither know how to test or fault find a RFC, or by lecturers that find it too tiresome to teach the unique subtleties of RFCs to the short-course students!!

I would just like to point out that i am not imcompetent and i know how to test and fault find! I only asked the origanl question as i have hurd it twice and once by a lecturer, i just wanted to know what you all thought,


i did a 5 year electrical apperenticeship, won a ECA electrical apperentice of the year award, had 8 years on the job experience but my career took a diffrent route for 2 years away from electrics and now just got my quifations upto date and slowly moving back to electrics,

when you have been out the game for a few years and alot of regs have changed, some times when you hear things also from a lecturer you have to ask questions to find out what other people think, this dose not make you incompetent!!!!

 

[telectrix]

dj., eng54. was not suggesting that you were incompetent. he said the rumours were normally started by incompetents etc.

 

[Engineer54]

I would just like to point out that i am not imcompetent and i know how to test and fault find! I only asked the origanl question as i have hurd it twice and once by a lecturer, i just wanted to know what you all thought,


i did a 5 year electrical apperenticeship, won a ECA electrical apperentice of the year award, had 8 years on the job experience but my career took a diffrent route for 2 years away from electrics and now just got my quifations upto date and slowly moving back to electrics,

when you have been out the game for a few years and alot of regs have changed, some times when you hear things also from a lecturer you have to ask questions to find out what other people think, this dose not make you incompetent!!!!

Exactly as Tel stated, wasn't thinking or talking about you at all. Just stating how these rounds of ring demise myths generally get started....

 

[hermetic]

It's been in discussions for many years now. I myself always raise awareness to delegates about the considerations that are made for this to be an issue.
The last time I brought it up with Geoff Cronshaw I got feedback that the consideration would be to restrict them only to installations under the control of skilled/instructed persons.

I personally don't think they will ever remove the ring final circuit. If they were, it would require an incident of some kind directly resulting from the area of concern that would motivate the change. IMO

Hermetic lolz

 

[supasparxs]

i would use radials , no more than 10 IT% items per circuit. will you have RCD protection? if so leakage could be a problem, also hi integrity earthing is desirable.

I understood the issue with earth leakage on IT equipment was due the the CRT monitors being cr@p
as everyone uses LCD monitors now it wasn't an issue?

 

[Silly Sausage]

I understood the issue with earth leakage on IT equipment was due the the CRT monitors being cr@p
as everyone uses LCD monitors now it wasn't an issue?

I've always thought it was the mains filters on the system units.

 

[jave]

i think ring main system are more efficient in hv distribution system

 

[hermetic]

I've always thought it was the mains filters on the system units.

Think you will find that it is mainly to due with the degaussing set up on the CRT that discharges any static build and capacitance build up to earth or chassis as you turn the monitor on. That is the crackle you hear at switch on.

 

[malcolmsanford]

There was I thinking that Computers, monitors, printers and most types of electronic equipment are the cause of the problem.

As this equipment utilize switched mode power supplies (SMPS) which operate by rectifying the mains supply directly and then using a high speed switching converters to step down the voltage to the accommodate the dc supplies required.

The switch spikes have to be filtered out so that they do not get into the installation and cause interference to other users, so a small filter is fitted at the mains input to each item of equipment.

A typical filter either contains contains two capacitors from Line and Neutral to the circuit protective conductor (CPC), or in many cases in modern equipment small PCB so a small continuous current flows to earth, giving us this protective conductor current