DIYbanter - View Single Post

On 21 May 2004 08:09:02 -0700, in uk.d-i-y (Paul)
strung together this:

1. I'm going to use a spare 20Amp 'B' type MCB on the non-RCD
protected side of the CU using 4mm T+E cable. Can I use normal T+E
cable for the first 8m (up to the outside of the house) and then
connect it using a junction box, to 8m of SWA 4mm cable to the shed?

Yep, all looking good so far.

2. I was planning to place the RCD spur unit inside the shed at the
end of the SWA cable. Can I then continue the radial circuit using
normal 4mm T+E or could I use a Fused Connection Unit after the RCD
and continue with 2.5mm T+E?

Why not use a 'garage unit'. A 25A RCD with a 16A and 6A MCB. Run the
lighting in 1mm from the 6A and the power in 2.5mm from the 16A.
(screwfix.com Cat No. 63138).

3. Can I use a plastic back box for the double socket or are there
special 'shed' style sockets?

You can use plastic sockets, if they're not likely to get battered. I
usually fit metalclad accessories in out buildings and the like.

4. I have estimated a total of 10m of cable being used inside the
shed. Does this have any impact of whether I should use a separate
earth rod or can I just connect the power to the house earth?

As it's only over a relatively short distance I would export the house
earth to the shed.

Just so you know, I was going to spur to use a 5amp FCU for the shed
light and the security light.

Yep, that or the way I suggested above.

Also, all the outside cabling is SWA and
will be in that 20mm blue plastic piping that you can buy from Wickes,
buried deep deep underground.

You don't need to enclose SWA in anything, if you do make sure it
isn't in a water pipe! It only confuses people in the future. I would
bury the SWA as it is.
--

SJW
A.C.S. Ltd.