Surface mounting a spur

[Marnhullman]

I want to mount a 13 amp socket on an oak pillar just above floor level. I propose to take a spur from an existing socket approx 3 m distant however the cable will have to be surface mounted and needs to run just above floor level and be secured to the bottom frame of a sliding door, which is thick enough to take a nail.

Is it OK to route the cable through surface mounted ducting? I've just read about a product called D-line which can be stuck to the surface and is available in an oak finish so could I use that for a power cable?

Thanks for any advice.

 

[PrenticeBoyofDerry]

Is it OK to route the cable through surface mounted ducting? I've just read about a product called D-line which can be stuck to the surface and is available in an oak finish so could I use that for a power cable?

It is okay to use containment such as trunking and conduit to route cable,so that is fine.
As far as the spur is concerned, you must firstly identify the circuit and what part of the circuit the socket you are taking the feed from takes.
As you cannot take a spur from a spur on ring final circuit, unless the existing spur is a fused spur directly from the ring.
Also any newly installed socket will require 30mA RCD protection, if the circuit you are taking the feed from, does not already have this.

 

[PrenticeBoyofDerry]

Just to add an unfused spur should only be a maximum of 3 metres from the ring feed.

 

[Spark123]

Why 3m max?

 

[JohnW2]

Why 3m max?

I presume he means that the socket should be within 3m of the point of connection of the spur to the ring, and that he has 433.2.2 in mind.

Kind Regards, John

 

[Spark123]

The unfused spur is protected against fault current by the circuits fuse which satisfies 433.2.2 (i) hence (ii) doesn't need to be applied.

 

[JohnW2]

The unfused spur is protected against fault current by the circuits fuse which satisfies 433.2.2 (i) hence (ii) doesn't need to be applied.

Yes, I agree - and my apologies for confusing things by typing 'FCU' (which would have been an odd thing to find in an unfused spur ) when I meant 'socket' - now edited to correct!

I've no idea where it comes from, but the infamous OSG suggests that the length of an unfused spur should not exceed one-eighth of the cable length from the spur to the furthest point on the ring!

Kind Regards.

 

[Marnhullman]

Thanks to all.

How do I identify whether the socket I propose to take a spur from is itself a spur? The house is 6 years old and has not had any other electrical work done since then so could I assume it's not a spur or is it normal practice to include spurs even on initial installation?