4mm Radial vs 2.5mm Ring

[neil_ev]

Hi all,

when undertaking a full rewire I have always installed a 2.5mm Ring Main for the sockets. I am considering switching to a 4mm Radial for easier testing (plus I don't like the idea of it being possible to unknowingly break a ring main and not know about it causing possible overloading).

Just wandering if any experienced peoples have any thoughts on this?

thanks

Neil

 

[Amp David]

On a serious note, if you do a search of the forum, there is a good post regards the pros and cons of each.

I think this will help you make your mind up TBH

 

[Richard Burns]

I would read the thread ring Vs radial or read the "similar threads" at the bottom of the post, opinion is divided!!

 

[neil_ev]

just found that. thanks. seems quite a read!!

 

[telectrix]

or you could use 2.5mm radials for the main house. 2 or 3 depending on the size of the property, then a 4mm radial for the kitchen. each job is different.

 

[Farmelectrics]

I was always pro ring main but over the last few years my bussines partner has ground me down and it's 4 mm radials from now on lol

 

[tigerpaul]

IMO the only real advantage of 4mm radial is quicker simpler testing and a slightly neater board.
2.5mm ring is cheaper and easier to install.
One leg back to the board from the last socket is no great hardship.

 

[kingeri]

Don't want to repeat what was said in my 'Ring vs Radial' thread, but each has there place. Don't let ease of testing influence the decision - that should only be based on good design practice. 32a 4mm radials are somewhat limited when it comes to circuit length (voltage drop/EFLI) and also limited in terms of installation methods allowed - the CCC soon drops below 32a if not clipped direct.

 

[Adam W]

Imagine spurring off that in an emergency when the customer doesn't want too much disruption, laminate floor above or whatever - 2x4mm and a 2.5mm in one socket terminal might be a bit of a squeeze.