Max floor area of a ring main?

[Octopus]

Surely if you only put 2 SO on a radial with a 20a breaker, there is FAR more likely hood of mr DIY adding sockets thus creating the circuit you fear so much, oh and he can also change the breaker to a 63a so why ain't you wiring in 16mm ' just in case'

Theres nothing stopping any numpty changing a breaker so that's a non starter - you can't legislate for the idiots, nor can you be held responsible for DIY antics later.

 

[Rampantchilli]

Theres nothing stopping any numpty changing a breaker so that's a non starter - you can't legislate for the idiots, not can you be held responsible for DIY antics later.

My thoughts exactly

 

[Guest55]

I've given you a like but its actually a "WTF????"

i'd have given you a like but its actually.........








WTF????

;-)

 

[terminator]

if you have a look in onsite guide (amendment 1)

100m is the recomended max length for a 2.5 ring feeding sockets.

also mentions 50m for lights if i remember correctly, havent used onsite guide for a while

Okay guys, we need to put this one to bed. It's not "100m is the max length for a 2.5 ring feeding sockets." It's Maximum FLOOR AREA per 100 square metres. In the BGB they clearly state that "Historically, a limit of 100 square metres has been adopted". This is where the "ring final circuit starts and finishes at the distribution board, where it is connected to a 30A or 32A overcurrent protective device".

It is clearly a recommendation (historical). 433.1.103.
This can be achieved by:
(i) locating so's to provide reasonable sharing of the load around the ring.
(ii) not supplying immersion heaters, comprehensive electric space heating or loads of a similar profile from the ring circuit.
(iii) connecting cookers, ovens and hobs with a rated power exceeding 2 kW on their own dedicated radial circuit.
(iv) taking account of the total floor area being served. (historically , a limit of 100m squared).

And it's not 50m length for lights - It's, for a Radial final circuit with a 20A protective device in 2.5mm (historically the floor area served is limited to 50m squared)

And for a Radial final circuit with a 30A or 32A protective device in 4mm (historically the floor area served has been limited to 75m squared.

I probably muddied the waters with my tongue in cheek comment that "mr diy would come along and uprate the breaker" This was meant as a throw-away quip - but obviously some peeps have taken it as verbatim. For that I apologise. I'll be more careful in future with my attempts at comedy.

I ought to add that the above quoted Regs are not aimed at the many regulars on here who are familiar with them - But those who may not have updated may find them helpful.

Ok, I'll put my tin hat on.

 

[Sharpend]

Well on that note its goodnight from me on this one!

 

[telectrix]

and it's goodnight from him.

 

[Sharpend]

Goodnight!

 

[KAS1]

Well terminated terminator