radial circuit wiring diagram with fused spurs advice

[Mahony76]

Hi, Im in the middle of building a conservatory on the side of my house and am nearing the stage where I need to install electrics. Ive drawn up a radial circuit diagram of how I think I would do it. I'll install all the wiring and sockets myself then get an electrician in to check and connect up to the house fuse box. Does this all looks ok and Is it ok to have two fused spurs off the one circuit ? cheers.

 

[sparkwright]

Assuming all of this IS a radial circuit it's ok, BUT

Do you really need those junction boxes?

They aren't really a good idea if they are going to inaccessible.

 

[sparkwright]

The other concern is that all these sockets and any concealed wiring less than 50mm from the surface will need to be RCD protected at 30 mA, yet your diagram suggests just the outside socket is RCD protected.

 

[Mahony76]

Assuming all of this IS a radial circuit it's ok, BUT

Do you really need those junction boxes?

They aren't really a good idea if they are going to inaccessible.

Thought it would be better than having three cables wired into the back of the socket, would it be better to just take the spurs off the sockets then like this?

cheers.

 

[sparkwright]

Yes, it would be better from a fault-finding point of view.

That said, can you run the wiring in one line, without 'spurring' off?

 

[Mahony76]

The other concern is that all these sockets and any concealed wiring less than 50mm from the surface will need to be RCD protected at 30 mA, yet your diagram suggests just the outside socket is RCD protected.

The armoured cable will go to the house fuse box and be wired into a 30ma RCD

 

[Mahony76]

Thanks for your help

 

[Mahony76]

The armoured cable will go to the house fuse box and be wired into a 30ma RCD

Should I use a 20amp mcb in the fuse box as I'm using 2.5mm cable?

 

[EFLImpudence]

The armoured cable will go to the house fuse box and be wired into a 30ma RCD

No overload protection?

I'll install all the wiring and sockets myself then get an electrician in to check and connect up to the house fuse box.

It doesn't work like that.

http://www.legislation.gov.uk/uksi/2012/3119/regulation/6/made

 

[endecotp]

The armoured cable will go to the house fuse box and be wired into a 30ma RCD

In that case, there is no benefit in having an RCD outside socket. Just fit a regular weatherproof outside socket.

 

[oldbutnotdead]

And yes, 20A MCB for your radial as well as RCD protection. Do bear in mind what EFLI wrote- if you're lucky you'll find a local electrician who will come out, look at the job and your proposed cable runs, decide where the cables need to go, what sizes, safe zones etc etc etc. then let you throw the cabling and backboxes in, then come back and test, terminate and certify. Might be worth you getting someone to price for doing the whole job- it's not exactly massive is it?

 

[ban-all-sheds]

Should I use a 20amp mcb in the fuse box as I'm using 2.5mm cable?

When you designed the circuit, what did you work out was the Iz of the cable?

 

[winston1]

The armoured cable will go to the house fuse box and be wired into a 30ma RCD

In that case the outdoor socket does not to be a RCD type. No point in having two trips to reset.

Edit. Beaton to it!

 

[aptsys]

Have you found an electrician that is happy with your proposed scheme and is happy for 3rd party test and notification of the installation?

 

[Mahony76]

When you designed the circuit, what did you work out was the Iz of the cable?

Have you found an electrician that is happy with your proposed scheme and is happy for 3rd party test and notification of the installation?

Yes I have, he's going to check all my wiring over and then connect to the house fuse board then provide a test certificate and register with local council