"All new ring mains are now installed in 4mm not 2.5mm.

[r.bartlett]

On another forum this was posted-I didn't think it was true but I thought I'd ask

Anyone care to comment

Cheers

Richard

 

[RF Lighting]

News to me.


Give us a clue which forum

 

[JohnD]

was it on "www.idiotsaresus.com?"

 

[r.bartlett]

thanks guy's -it was posted by a 16th ed guy too

Cheers

Richard

 

[breezer]

i heard that one years ago, some lecy board was actulay doing it

 

[dingbat]

Well let's face it, at 11kV a 4.0 sq mm cable will carry a fair amount of power.

It's a ring final circuit, fer chrissakes!

 

[idiot]

was it on "www.idiotsaresus.com?"

sus?

 

[ebee]

Reminds me of many moons ago when felow sparks asked me if I installed ring mains and I answered No . Then He said you must install radials for sockets and I said not usually. LOL

 

[FatGit]

There was a guide at B&Q that said 4mm2 for 75m2 areas and 2.5mm2 for 50m2 areas. Could be form that.

 

[Spark123]

75m² is the max recommended floor area for a 32A radial socket final circuit.
afaik the only time when the CSA needs to be raised to 4mm² for a RFC is when there is thermal insulation involved.