Fused spur

servicepoint · 13 Jun 2010

Hi,
I am looking for some guidance on installing a fused spur for underfloor heating. The heating mat is 10msq x 200watts so 2000watts total. I have been advised this can be installed off a 13amp fused spur which is fine as I have a double socket and single socket located directly through the wall from the installation (house has concrete floor so it difficult for running cable). My question is can I also spur off the double/single cocket to install sockets in the room of with underfloor heating.
Sockets are to 32amp breakers on the consumer unit.
thanks .

londonboy · 13 Jun 2010

You need to test and check to see if the double and single outlet are in fact a ring.

Isolate the power (check for dead).
Remove either socket.
Look for continuity between L - L, N -N, E - E.
This will tell you if you have a ring.

OwainDIYer · 13 Jun 2010

You can supply one single or double socket or one FCU per spur.

If you want more sockets than that they they would have to be supplied through a 13A FCU and the total load would be limited to 13A. (The triple sockets you can get include a 13A fuse and count as a fused spur.)

servicepoint · 13 Jun 2010

OwainDIYer said:
You can supply one single or double socket or one FCU per spur.

If you want more sockets than that they they would have to be supplied through a 13A FCU and the total load would be limited to 13A. (The triple sockets you can get include a 13A fuse and count as a fused spur.)

Not sure if I'm understanding you, can I take one 13A FCU from my existing socket and then a further 13A FCU from the 13A FCU already taken.
I'm going to get an electrician in to do the work but want to know if what I need is possible or not.

londonboy · 13 Jun 2010

servicepoint said:
OwainDIYer said:

You can supply one single or double socket or one FCU per spur.

If you want more sockets than that they they would have to be supplied through a 13A FCU and the total load would be limited to 13A. (The triple sockets you can get include a 13A fuse and count as a fused spur.)

Click to expand...

Not sure if I'm understanding you, can I take one 13A FCU from my existing socket and then a further 13A FCU from the 13A FCU already taken.
I'm going to get an electrician in to do the work but want to know if what I need is possible or not.

You could do as you ask.. aslong as the exisiting socket and fcu are part of a ring circuit. Which you won't know unless you test as i said above.

servicepoint · 13 Jun 2010

londonboy said:
servicepoint said:

OwainDIYer said:

You can supply one single or double socket or one FCU per spur.

If you want more sockets than that they they would have to be supplied through a 13A FCU and the total load would be limited to 13A. (The triple sockets you can get include a 13A fuse and count as a fused spur.)

Click to expand...

Not sure if I'm understanding you, can I take one 13A FCU from my existing socket and then a further 13A FCU from the 13A FCU already taken.
I'm going to get an electrician in to do the work but want to know if what I need is possible or not.

Click to expand...

You could do as you ask.. aslong as the exisiting socket and fcu are part of a ring circuit. Which you won't know unless you test as i said above.

ok thanks I'll let the electrician test for this and take it from there.

servicepoint · 13 Jun 2010

londonboy said:
You need to test and check to see if the double and single outlet are in fact a ring.

Isolate the power (check for dead).
Remove either socket.
Look for continuity between L - L, N -N, E - E.
This will tell you if you have a ring.

I have just been informed that the sockets are in a ring circuit, does this enable me to take the 13A fcu for the floor heating and two double sockets from the existing double and single socket in adjacent room?

londonboy · 13 Jun 2010

Theres a few different ways of doing this, either way your electrician will be able to take power from that point.

servicepoint · 13 Jun 2010

As its a ring main can I break into the ring and add 2 or even 3 double sockets and also take a 13A fused spur from the existing double socket.

ban-all-sheds · 13 Jun 2010

Your electrician will know what to do, including testing to see if any particular cable is actually part of a ring final and not a spur.

LoveRocket · 13 Jun 2010

servicepoint said:
As its a ring main can I break into the ring and add 2 or even 3 double sockets and also take a 13A fused spur from the existing double socket.

Yes you can, as long as you (or. ahem, your electrician) extend the ring and don't just spur from it.

All this faffing is one of the reasons I don't like ring circuits.

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Fused spur

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