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?

 

[dinger809]

I’ve seen this a few times in schools and in commercial/industrial, when the RFC is a distance from the dis board. It reduces volt drop, cable cost and takes less room in trunking. Not against any regs, but personally not my favourite circuit type.
I think there should be a reg that identifies it at the board, as it can cause a confusion at best

 

[spark 68]

It may cause some confusion in domestic as it is not in the OSG nor in app15 pics in the regs book , and wasn't really seen that much in that environment until fairly recently (more frequent kitchen re-fits ?) , however in the industrial/commercial world it has been around for almost ever, having said that the NIC only 'officially' seemed to recognise it in the mainstream in the last few years, some of the younger sparks seem never to have seen it at all, makes you wonder what gets taught these days ????

Not many of the younger sparks will even know what a staggered ring final looks like either now I bet that will be confusing

Edit: please don't invent any more stupid regs, the IET will have it in the next AMD

 

[Deleted member 26818]

Maybe it was this song then, no pleasing some people

Yep that’s the one.

 

[sheppertonspark]

How is the 4mm run to where it splits ? Apply a few de-rating factors and your 4mm becomes a 20 Amp circuit. Nothing wrong with the circuit arrangement by the way.

 

[Pete999]

It may cause some confusion in domestic as it is not in the OSG nor in app15 pics in the regs book , and wasn't really seen that much in that environment until fairly recently (more frequent kitchen re-fits ?) , however in the industrial/commercial world it has been around for almost ever, having said that the NIC only 'officially' seemed to recognise it in the mainstream in the last few years, some of the younger sparks seem never to have seen it at all, makes you wonder what gets taught these days ????

Not many of the younger sparks will even know what a staggered ring final looks like either now I bet that will be confusing

Edit: please don't invent any more stupid regs, the IET will have it in the next AMD

Kev the Kitchen fitter's fav circuit, and what has the NICEIC got to do with things? they are just a CPS, nothing more nothing less.

 

[MG201]

Could it be the case of the 4mm being run in for the cooker originally then it has been changed over time and the feed reused for a new ring rather than going back to the CU like others have said sounds lazy

 

[Pete999]

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

Cowboys at work then?