2 rcbos per room

[ebee]

I guess it depend on outlets. My living room has 5 sockets so a ring in that context would make more sense, whereas the utility room only has one so a radial is more sensible.

A Ring Final circuit I was brought up on in my working life so no problem to me, younger electricians are not so keen on them, the outside world is not so keen either. Both the ring final circuit and the radial final circuit have both advantages and disadvantages in comparison to other. So which methodology you employ depends upon what benefits you want to achieve and the cost/work/convenience you aiming at

 

[omph]

A Ring Final circuit I was brought up on in my working life so no problem to me, younger electricians are not so keen on them, the outside world is not so keen either. Both the ring final circuit and the radial final circuit have both advantages and disadvantages in comparison to other. So which methodology you employ depends upon what benefits you want to achieve and the cost/work/convenience you aiming at

Thanks for the input and I agree, but we should both yield to @Murdochcat - the presumptuous spark diety.
Regressive dogmatisms are a curse, different techniques, tools and variations all have their place in all engineering disciplines and are mostly contextual on the desired outcome.

 

[Murdochcat]

Thanks for the input and I agree, but we should both yield to @Murdochcat - the presumptuous spark diety.
Regressive dogmatisms are a curse, different techniques, tools and variations all have their place in all engineering disciplines and are mostly contextual on the desired outcome.

So diyer thinks they know best

My advice to you is to discuss the options with the spark doing the work

For your computer room i would suggest 2 circuits

 

[Harry Bloomfield]

Yay or nay ? One for lights, and another for socket ring. It'll be more cabling but any trips will be constrainted to a very small zone. Although the downside is of course more rcbos (20 in my case!)

Having lights on a lighting circuit, and wall-lights/table lights, on the plug circuit, ensures a room always has some lighting available. A reliable source of light, is usually more important than having sockets working.

 

[ebee]

a completely separate circuit for a fridge freezer has its merits as it only trips if that one dedicated circuit is tripped/out of commission and a socket from a nearby ring or radial can be used if that one dedicated circuit is out of commission for some reason.
You might want to give some kitchen sockets to one circuit and some others to other circuits to give some resilience in the kitchen if not because it`s likely to be the highest load area so you spread it.
You could even plan it so each room contains sockets on two circuits.
You might even have main rooms lighting on one or two circuits and wall lighting (or table lamps points) on 1 or 2 different circuits .
Of course it increases cable runs quite often therefore costs though so a balance of cost against reliance is need.
One such balance I achieved was a house on three levels therefore two staircases (door at each end therefore enclosed and dark.
I put the three different floors each on their own lighting circuit and because they wanted steps lighting like they`d seen in airports along with overhead lighting therefor both staircases had two separate methods of illumination and it was easy to wire each on two different circuits. So any trip on one lighting circuit meant they could still have some means of lighting for a bit more safety resilience. I had suggested considering emergency lighting in those two areas but they were not keen, of course it still relied on being at the mercy of a total power outage.

 

[FrodoOne]

a completely separate circuit for a fridge freezer has its merits as it only trips if that one dedicated circuit is tripped/out of commission and a socket from a nearby ring or radial can be used if that one dedicated circuit is out of commission for some reason.

Yes.
However. a Fridge/Freezer on a Radial Circuit also supplying some of the Socket Outlets in another room
is unlikely to suffer many Kitchen Overload problems,
as is the case in my home.

You might want to give some kitchen sockets to one circuit and some others to other circuits to give some resilience in the kitchen if not because it`s likely to be the highest load area so you spread it.

I have three 20 A Radial circuits supplying various Socket Outlets in my Kitchen - including the Fridge - from a circuit supplying part of the adjacent Lounge room

You could even plan it so each room contains sockets on two circuits.

My "Lounge/TV" room is so organized.


It is "interesting" that "Ring Circuits" are permitted only
in the UK,
ex British Colonies
and
Saudi Arabia.
(Please advise if there are other countries whic fit into this category.)

Elsewhere, they are not allowed.

Most other countries Jurisdictions seem to share the opinions of John Ward !
(See

)

 

[ebee]

Yup the UK Ring Final Circuit is very unusual on the world stage, I think that when it was first put out it would not be very popular in the UK either but many years later viewpoints changed Like I said both ring and radial have advantages and disadvantages over each other, to sum up "horses for courses"

 

[Harry Bloomfield]

a completely separate circuit for a fridge freezer has its merits as it only trips if that one dedicated circuit is tripped/out of commission and a socket from a nearby ring or radial can be used if that one dedicated circuit is out of commission for some reason.

Last year, did an extensive revision, in fitting a new consumer unit, which gave the opportunity to add a few new circuits, and split a few up, and add RCD's. We had sockets on two circuits, and lighting on just two circuits. One of the extra circuits, was a radial, for a freezer in the utility, and a fridge freezer in the kitchen. The sockets for which I deliberately decided should not be on RCD's, and the sockets for which were tucked well out of the way, and marked 'fridge/freezer only'.

I never liked the idea, of fridges and freezers, being, as they were, on a shared ring, with the rest of the entire ground floor, which also supplied a spur for garage, hut, plus multiple outdoor sockets.

 

[omph]

So diyer thinks they know best

My advice to you is to discuss the options with the spark doing the work

For your computer room i would suggest 2 circuits

First off, I am not a "diyer" - I don't know why you keep assuming things.
I've seen a number of pro DIYers do one on sparks. I had a spark do some contract work for me, puts a 10kW shower on an RCD (great) but it has no short protection and he relied on the 50 amp supply side fuse to break the circuit - nice, or should I say NICE - he it was NICEIC registered. What you are doing is invoking the appeal to authority logical fallacy, you should read up on it.

Relax, loosen those clenched butt cheeks, we're just having a discussion - I am planning on swapping the consumer and am considering something that never occurred to me before and decided to throw it out there to see what sticks.

 

[ebee]

I had a spark do some contract work for me, puts a 10kW shower on an RCD (great) but it has no short protection and he relied on the 50 amp supply side fuse to break the circuit - nice, or should I say NICE - he it was NICEIC registered

Does the 50A supply side fuse give the required protection to the 10KW shower cable or not?
What is wrong with an RCD on a 10KW shower?
I am asking for clarification because I might be misunderstanding what you are trying to say here. Thanks,

Any OPD (such as a fuse or breaker) might be used to protect 1,2, or 3 things = Overload, Short Circuit, Earth Fault.
AN RCD should be selected to cover Earth Fault, so the OPD is not required for that such as in a TT System , in a TN System we usually still rely on the OPD for that and consider the RCD as back up for that.
So Overload and Short Circuit protection, do they need addressing and are they covered?

 

[robinbanks]

not knowing if you're up against a short or leak to cpc

If you don't know how to test for those..