Spur from an FCU to an FCU?

[Stormflex]

Evening all,

Just been to look at a job and a little unsure how to handle one aspect of it:

Client wants an outside socket and outside light put on their extension.

In the extension is a cupboard housing the boiler. The cupboard has an FCU feeding a socket. Initially I thought of taking a feed from this FCU to an outside socket with integral RCD. But, then I realised that if they ever wanted to isolate it they'd also turn off the boiler. So, can I run a cable from this FCU to a further FCU to feed the socket?

Likewise, could I add yet a further FCU to feed and isolate an outdoor light?

Thanks for any suggestions,

Rich

 

[SirKit Breaker]

Yes because you are protecting the extended circuit with a 13a fuse. I have seen sockets taken off a ring, and run as a radial from it but with a FCU at the point of extension. Not ideal, but it is compliant, just like using an extension lead. You can keep on adding, as long as it stays in spec for volt drop, Zs etc etc. How and what gets isolated as a result, is for discussion between you and client.

Cheers..........Howard

 

[flukey]

why would the boiler go off if the fcu supplying the socket was isolated

 

[Stormflex]

Good question. I have made the assumption that the FCU that is already in the cupboard is the isolator for the boiler.

 

[flukey]

so the fcu is supplying a socket outlet and the boiler already

 

[telectrix]

so you tap your new FCU from the "live" side of the boiler FCU.

 

[Stormflex]

Correct. I've just e-mailed the client to confirm but I believe the boiler is plugged into the socket (that is being fed from the FCU). I didn't see anything else in the cupboard that could have been plugged into that socket.

 

[Stormflex]

telectrix - yes, that's my plan (now). Originally I was going to run straight from the current FCU to the outside socket. But, then I realised you wouldn't be able to isolate the socket without isolating the boiler at the same time.

 

[flukey]

seems a strange set up? fcu supplying a socket that supplies the boiler? if the fcu is for the boiler why isnt it hard wired? or is it a 2 gang socket and they use the spare for something else?

 

[Stormflex]

I'll let you know when I know!

Wish I'd studied it a bit more closely now

 

[flukey]

haha, know what you mean. my thinking is if the fcu is off the ring then the boiler would be hard wired into it and the socket could be a spur from the ring. if the fcu is on its own radial why cant you just extend it to allow for new socket and light?