Ring Extension

[GrantF]

Allow me to pour water on troubled oil... and arrange options in a 'preference' order, depending on the length of wire in the existing ring main
(as suggested by others a grand round loop length of 84m for a 'normal' wiring arrangement, but we are assuming a 'B32' type circuit breaker and no RCD, for hot-wire fuses or other types of breaker the maximum permissible length changes - see guide in 'for reference' section for the gory details)

Cheers, will do.

BUT, Whatever you do for the sockets, your security light will certainly be best on its own fused spur, just so when it dies, you don't have to turn off the indoor house lights to change the bulb.

regards Mike P-J

Thats why I thought it would be better to run it from this extension. As I would just need to pull out the fuse from the new spur to isolate that part of the circuit, and cut any flow to the light?

 

[ban-all-sheds]

Don't need to pull the fuse to isolate it - that's what the switch on the FCU soes....

 

[towman]

Better to be safe than sorry though - some twonk could always flick the switch when you're not looking!

 

[GrantF]

Better to be safe than sorry though - some twonk could always flick the switch when you're not looking!

That was my view as well.


So to recap again then, I can just run a single 2.5mm T+E cable to the loft from the socket, then connect a FCU to that, and from there, run two double sockets and also a mains feed to the outside security light?

 

[ban-all-sheds]

Yup. Possibly a 2nd FCU just for the light - it's unlikely to need a 13A fuse, and although the chances of an internal fault are vanishingly small, you ought to do the right thing and fuse it appropriately - 3A probably.