Lighting circuit

[deanalani]

Hi, I am going to fit a standard 230v light in my shed. I want to take the power from a socket and was going to fit a FCU with a built in RCD.

I know a lighting circuit is 1.5mm and the socket is 2.5mm what shall I wire the light in if I am taking it from the socket 2.5 or 1.5

Any help would be appreciated

 

[ban-all-sheds]

Are you talking about a socket already in the shed?

What is the rating of the fuse/MCB that the cable to it comes from?

Assuming you're going to have the cables on the surface you don't need an RCD FCU.

 

[GaryMo]

You would normally supply the FCU with 2.5mm2 conductors but 1.5mm2 conductors may also suffice.

 

[deanalani]

Hi, Thanks for advice. Yes I did mean the socket is indoors and I want to run cable about 10ft into my shed outside. so if it is taken from the indoor socket. Is the guy right to fit a FCU with an RCD and wire it in 2.5mm T&E? If so is grey T&E OK or is another cable recommended?

 

[securespark]

Doesn't sound like your guy knows his onions...

 

[Taylortwocities]

T&E is not suitable for use outside.

 

[sparkmanc]

Ideally, you could run a SWA 2.5mm to a RCD FCU13A in the shed, then feed your light off that. You could even have a socket if you wanted.

 

[Lectrician]

Your sockets in the house may already be RCD protected. In which case, just some SWA from a Switched Fused Connection Unit adjacent the socket indoors out to the shed. In the shed, a double metal clad socket with a metal clad Switch Fused Connection Unit adjacent. This would be for the light.

Join the two metal clad accessories together with a 20mm galv conduit adaptor and brass bushes.

2.5mm all the way upto the last FCU, 1.0 or 1.5mm to the light.

If you do not have RCD protection to your sockets already, fit an RCD/FCU in the house next to the socket in place of the FCU.

 

[GaryMo]

If you do not have RCD protection to your sockets already, fit an RCD/FCU in the house next to the socket in place of the FCU.

But don't link the two with t&e alone at a depth of less than 50mm!

A glav coupling and a couple of brass bushes would work a treat, making sure there's an earth link present to the backboxes.
Would a coupling be covered by BS EN 61386?
If not, I don't think it would bother me listing it as a departure from BS7671:2008.

 

[Lectrician]

If you do not have RCD protection to your sockets already, fit an RCD/FCU in the house next to the socket in place of the FCU.

But don't link the two with t&e alone at a depth of less than 50mm!

A glav coupling and a couple of brass bushes would work a treat, making sure there's an earth link present to the backboxes.
Would a coupling be covered by BS EN 61386?
If not, I don't think it would bother me listing it as a departure from BS7671:2008.

If you butt the RCD/FCU upto the socket, I see no issue. It may well be surface or trunk too. I doubt the OP is going to chase out for the new FCU indoors.

 

[GaryMo]

I just see things as how I would do them.
If the socket was flush then so would the FCU be.
I'd also maintain a reasonable gap between to match the rest of the accessories I had installed. I'm not a fan of accessories being butted up together.

You're right though, there are so many variables.

 

[bernardgreen]

If the socket to be used is a single then by changing the back box to a twin box he will then have the socket and FCU neatly side by side , Only a minimum of work to enlarge the hole from single to twin

Note to OP. a twin metal back box is not the same as a back box for a double 13 amp socket. It is bit wider and has mountings in the middle

 

[Lectrician]

Twin? You mean dual