Ring main 100 square metres?

[La Poste]

I have read in the regulations that a ring circuit can cover a floor space of 100 square metres.
I am re-wiring a bungalow at the moment and the floor space is 88 square metres.
I am using 2.5mm stranded singles and 1.5 mm earth.
I am feeding the singles down the existing conduit in the walls from the loft.
Although the ring is less than 100 square metres I am wondering if the equation will be correct due to the fact I have cable drops of 3 metres to each socket.
Does the 100 square metre rule apply if I have these cable drops?
The ring supplies 7 sockets and the kitchen will be on it's own separate circuit.
There are no heavy loads being drawn from any socket but this may change in the future.
Any advice would be most welcome.
Thanks.

 

[Risteard]

the only figure given is still 100sq m.

But no figure is now given for floor area.

 

[Guest123]

Circuit length is restricted more by volt drop IMO as depending on what you take as (Ib) it varies form 79M to 106M.

 

[Risteard]

Agreed.

Incidentally, what would you take as Ib? 26A? Or 32A?

 

[Guest123]

I use an (Ib) of 26A, which would give us a max length of 98M.

It can be engineered further but I prefer to err on the side of caution with 26A and (Ct) of 1.

 

[Risteard]

I use an (Ib) of 26A, which would give us a max length of 98M.

It can be engineered further but I prefer to err on the side of caution with 26A and (Ct) of 1.

Good stuff. I've been using an Ib of 26A myself and was hoping it wouldn't raise any eyelids...

 

[Guest123]

No eyelids raised here.

We all know the current in a ring circuit is not the same all the way round. The average works out to be 26A so thats what I use.