2.5mm Ring wired off a 4mm Radial

[Chris]

Hi,
I have been testing a domestic property today and when i started to look into the kitchen sockets there is a 4mm radial from the DB going to one socket on one side, the 4mm radial is cut into and JB'd and 2x2.5mm cables run out forming a ring for the other 4 sockets...

Does this obey regs? I know you can run 2.5mm spurs off 4mm but havent seen or heard of this before?

 

[Pete999]

Hi,
I have been testing a domestic property today and when i started to look into the kitchen sockets there is a 4mm radial from the DB going to one socket on one side, the 4mm radial is cut into and JB'd and 2x2.5mm cables run out forming a ring for the other 4 sockets...

Does this obey regs? I know you can run 2.5mm spurs off 4mm but havent seen or heard of this before?

A lollipop circuit then, don't like em but don't think they are against the Regs, or so I have heard on this Forum from time to time.

 

[Baddegg]

Lollipop circuit Chris...

 

[Deleted member 26818]

Reminds me of a song, can’t remember the words though.

 

[Pete999]

Reminds me of a song, can’t remember the words though.

 

[cliffed]

Just confuses things,why would you do that.

 

[Pete999]

Maybe it was this song then, no pleasing some people

 

[Silly Sausage]

Just confuses things,why would you do that.

Possibly an RFC remote from the DB?
Instead of running 2 x 2.5 mm^2 in parallel, run a single 4mm^2.

 

[Pete999]

Possibly an RFC remote from the DB?
Instead of running 2 x 2.5 mm^2 in parallel, run a single 4mm^2.

Thought he was talking about the song.

 

[cliffed]

Possibly an RFC remote from the DB?
Instead of running 2 x 2.5 mm^2 in parallel, run a single 4mm^2.

Yea that’s ok,but 2.5 cables of that,I don’t think so.

 

[Chris]

A lollipop circuit hahah,
learn something new every day!
thanks for the replies

 

[Pete999]

A lollipop circuit hahah,
learn something new every day!
thanks for the replies

Well that's what this type of circuit are called, apparently.

 

[Grant webber]

I've always known it as being called a hybrid ring/radial circuit

 

[Pete999]

I've always known it as being called a hybrid ring/radial circuit

Call it what you like Grant, may not be non compliant, but something I wouldn't contemplate doing.

 

[Grant webber]

Personally I would call it lazy. Never installed one and probably wouldn't. But come across a few of them.

 

[Pete999]

Hi,
I have been testing a domestic property today and when i started to look into the kitchen sockets there is a 4mm radial from the DB going to one socket on one side, the 4mm radial is cut into and JB'd and 2x2.5mm cables run out forming a ring for the other 4 sockets...

Does this obey regs? I know you can run 2.5mm spurs off 4mm but havent seen or heard of this before?

One would think if you do what you suggest you would need to reduce the size of the OCPD at or near the change of cable size, wouldn't you????

 

[Chris]

One would think if you do what you suggest you would need to reduce the size of the OCPD at or near the change of cable size, wouldn't you????

Are you talking about a 2.5mm spur off a 4mm radial? It is compliant if you only have 1 socket outlet as they are rated 13a so if any higher load was placed on the cable the socket would fail.

 

[pirate]

Is it simply a case of "get some power in there, 4mm will do it...then get some sockets off that, 2.5 rfc will do?"
I ask this as a complete novice, but I can see some logic in such a lollipop arrangement...
However, I have no clear idea what circuit protection would be appropriate, given I have no idea what the final load might be...
maybe one level at the CU, and another at the junction with the rfc?
Or maybe just assume that the final load will never be enough to cause a fire?
Hmmm...
think I need to get an electrician in!

 

[cliffed]

It’s something you would of done,with the old boys,back in the day,but not now “Surely” & stop calling me Shirley.

 

[littlespark]

Whether a 4mm radial, or a 2.5 rfc from source, it would still be generally a 32A OCPD.
I just think it over complicates matters and makes it more confusing for the next spark to work on the circuit.
It shouldn't be done, but its compliant, so hey.