Running Radial From Ring

[SKY]

How many radial sockets can you run from a ring main? is the answer the same for a kitchen?

But if you are working on someone house where the cable all chased in how can you tell if the ring socket in question does not already have a radial running from it?

I'm still at college so go easy on me.


Many Thanks

 

[acat]

On a ring you can have one spur for every socket any more than that you must have a fused spur testing should tell you but if in doubt take the socket out if you have nine cables its feeding a spur


Chris

 

[chris gray]

i thought you were only allowed one point off a socket on the ring?
ie you cant run a radial off a ring, even if you do put a switch fused spur in ?

 

[Notsosmart]

You can have an unfused spur connected to each socket outlet on a ring, a quick visual of the socket connections to see if you have a pair of Lives, a pair of neutral & a pair of earths will indicateyou may have a candidate to spur from.
To ensure that you are connecting to a ring (and not the middle of a radial), you deaden the circuit, lift the socket face disconnect the neutrals (check that it is in fact dead first), bell between the two neutral wires, go to nearest next socket (once again check that it isn't Live) disconnect the neutrals go back to the first socket check that continuity is lost.

Hopefully that is clearer than mud

A switched fused spur on a ring can control several sockets as the maximum demand would be 13Amps (Check the back of the BRB)

 

[eddielarge]

If you want to spur off of a socket for a few extra points why dont you just break into the ring and put them on the ring ,,, SIMPLES

 

[Johno]

the reason you cannot run a radial off a ring is because just 1 cable would be liable to overload ( because 32 amps is too much, generally) but if you came off a ring and went through a 13a spur to sockets then the cable should not overload. but this is a **** way of doing things and should only be used when you KNOW the extra sockets are for low current using using equipment and even then its a last resort

 

[chris gray]

live and learn

 

[SKY]

So what one is the correct answer,

one post says one radial per ring socket is ok (no fusespur)

and

Another post says that it cannot be done??

Confused..

 

[pennywise]

Have a look at appendix 15 on page 362 of the regs book some quite good information on there.

 

[Johno]

you can spur off a socket on the ring to one more socket only

 

[eddielarge]

So what one is the correct answer,

one post says one radial per ring socket is ok (no fusespur)

and

Another post says that it cannot be done??

Confused..[/QUO

WHY CANT YOU JUST PUT EXTRA POINTS ON THE RING MAIN AND NOT BOTHER WITH SPURS

 

[Notsosmart]

Sky, don't confuse a spur for a radial; you can have one unfused spur per socket in a ring.
However if you incorporate a fused connection unit (either switched or unswitched) you can then run in several more sockets in a radial ~ as mentioned not the best way to add extra sockets & if you are going into that much effort then it would be reasonably easy to extend the ring

 

[pennywise]

Page 159, 8.2.4 of the onsite guide same as above really

 

[SKY]

So what one is the correct answer,

one post says one radial per ring socket is ok (no fusespur)

and

Another post says that it cannot be done??

Confused..[/QUO

WHY CANT YOU JUST PUT EXTRA POINTS ON THE RING MAIN AND NOT BOTHER WITH SPURS

Sir, Why the capital letters which insinuates shouting? I'm a 1st year training elec and i'm only asking a general question.
I'm only asking if its possible and is within the regs.
I'm not saying that in some cases breaking into the ring is easier, but in some installs running 1 radial socket from a ring may be easier.

If all simple questions are answered like this maybe i should find another forum for help and advise.

Thanks guys who have guided me.

 

[Johno]

you're right sometimes it's easier and you are alowed, by regs, to do it. everyday and every job is different and you have to decide whats best at the time