A fused spur that goes where????

[razorback]

Bear wih me on this one.
Back in 2001, we had a new boiler installed, and a radiator moved upstairs. Now next to the timer - for the central heating etc - there are 2 fused spurs. One for the boiler and timer, and the other I haven't got the foggiest. Now all those years have gone by with that particular spur switched off and it's never affected us, until we had a problem with our boiler again. Got a fellow tradesman, gas safe and he asked what the other spur was for, and I just said it was for the the extractor fan and he accepted it. So to satisfy my curiousity I took the spur plate off and behind it were:- 3 x 2.5mm twin core and earth. One I suspect may go to extractor fan; there is an extractor fan upstairs but that works on the light....ultimately 3 x twin core and earth and I would like to know what it feeds, how do i do that? As I said everything appears to be working fine. Any help would be greatly appreciated.

 

[doni]

Two of them could be on the ring (SUPPLY) - and one could be for the extractor fan (LOAD). What do the connections look like behind tge FCU?

 

[ricicle]

Do all the 2.5mm² cables go to the feed L+Ns in the FCU. If so the then it may not actually supply anything, the two cables being part of a ring final circuit feeding it and a spur off.

Edited:I could swear the original post said 2x2.5mm when I first read it !

 

[Taylortwocities]

A photo of the wiring at the back of the FCU might help.

 

[sparkwright]

Hard to say, isn't it.

Is it normally switched on? Turn it off and see what doesn't work.

Could it be the immersion cylinder? Or a descaler? (although wired in unusual way, admittedly)

Check things like outside or additional lighting.

Is it a garage supply?

Occasionally, a fused spur can be fitted to supply other sockets and fused spurs when a supply directly from the socket ring circuit is not available.

 

[pjcomp]

As already mentioned two of them are probably the ring (in and out, as it were). Betcha the third one terminates in a junction box under a floor somewhere where something was disconnected.

PJ

 

[sparkwright]

It may have controlled a single socket that was designed for a fixed appliance to be plugged into.

 

[razorback]

Right, got L+N in the load, which will - I think - be the extractor fan... and 2 x L+N's in the feed (in and out) What a mess behind both spurs, plaster nd all that. I'll get some new ones and replace them; screws rusting and all sorts...just aswell am tiling the kitchen..

 

[razorback]

Ricicle I'd be inclined to agree with you...

 

[ban-all-sheds]

Is it normally switched on? Turn it off and see what doesn't work.

Now all those years have gone by with that particular spur switched off and it's never affected us ... As I said everything appears to be working fine.

 

[razorback]

Banallsheds...what's your view?

 

[sparkwright]

Is it normally switched on? Turn it off and see what doesn't work.

Now all those years have gone by with that particular spur switched off and it's never affected us ... As I said everything appears to be working fine.

Didn't RTFQ properly.

 

[razorback]

Indeed

 

[ban-all-sheds]

Didn't RTFQ properly.

It can happen to the best of us....

Banallsheds...what's your view?

My view is that as you don't know what that FCU used to serve you can't be sure where the load cable goes, i.e. you can't be sure it's in a safe zone, so you should disconnect it from the FCU.