Max floor area of a ring main?

[Sharpend]

What's happening this evening, it must be the high pollen count. Some of these posts this evening are bordering insanity, why don't we just prevent the customer from using electricity just incase they alter something.

Give it a break, work to the regs and let the rest of the world go by.

 

[Nightmare1308]

Then the test sheet you carried out and provided to the electrical council says it was a 16/20 radial

 

[terminator]

Then the test sheet you carried out and provided to the electrical council says it was a 16/20 radial

What electrical council is that?

 

[kingeri]

I was going to reply to this thread, but some of the points made here just warrant this, sorry:

 

[stuartcourt]

i've no idea what that means , and not really arsed either.
;-)

ha ha I was wondering myself but scared to ask incase it was some electrical joke I should know

 

[FAA Greenie]

OK, so we have a 'like' and a 'share' link on the posts, can we please introduce a 'WTF???' link please......

 

[Octopus]

OK, so we have a 'like' and a 'share' link on the posts, can we please introduce a 'WTF???' link please......

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

 

[shanky887614]

I always thought that you were allowed "unlimited socket outlets within 100m Sq."

I got told today that if the floor area was above 75m Sq it required an addittonal ring and this was the "new Regs" .

Is this correct?

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

 

[richy3333]

Rumour has it that the next BS7671 recommends that socket outlets be wired in 16mm T&E, be protected by a 6A breaker and the total number of SO's be limited to 0!

 

[Rampantchilli]

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'

 

[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!