UK DIY- advice on extending wiring into new shed

[swisstony]

Hi all, DIY here
First off let me just say it is advice I am after as I am fully aware that I will probably need an electrician to complete the job. My question is how much I can do myself up to a point.
So many years ago I built a shed at the top of the garden ( approx 30m away from garage). I needed power and lighting to the shed so purchased the armoured cable, fixings, outdoor sockets etc (on the advice of my sparky) and did the labour myself of digging the trench from the garage (where the feed would be ) laying the cable including tape, drainage etc. Then my sparky came in and did all the easy work Actually he was brilliant and connected up all the power, changed the fuse in the main board, added in lighting and fitted the exterior sockets for the garden. Tested and provided me with the certificate. All good.

So my next plan is to build even a bigger second shed behind the first one . During this lockdown project a man's got to have a project ! So I am building it myself over the course of the next few months. It will be positioned around 2 feet away from the first shed ( have attached a small rough diagram) . So the question at last : I would like to have power and lightning in the new shed (approx 10ftx8ft) pent roof style. So given that it will be so close to the old shed , how hard is to extend the power and lighting circuit into the new shed ? I will be using it as a small wood workshop so will need power sockets around the perimeter at worktable height. Probably about 4 double sockets. Lighting will be simple LED shop lights x 2 on the ceiling. nothing fancy.

How much could I do for the prep work ?
would it be an extension from inside the old shed across to the new shed or would it be a spur from the original feed ?
power tools are all 220V , I don't have any that are 110V

Thank you for any advice
cheers

 

[Baddegg]

Not just a man, but a man with two sheds!
We all bow down humbly in awe...

That’s the dream right there!....

 

[Mike Johnson]

DeWalt 745 does not have an induction motor, so will be very noisy comparatively, big consideration in a small shed.
[automerge]1585921647[/automerge]

That’s the dream right there!....

Are you Susan Boyle under that disguise.

 

[swisstony]

Bit off subject, but do you really need a site saw? What are you going to be cutting?

I think the guys said it, but yes man needs tools especially power tools Wood working is a hobby , love making and building stuff for around the house and on my wish list is a table saw as with that I can make so many alterations for rip cutting ( cross cutting is covered by mitre saw)
[automerge]1585985525[/automerge]

The reason for asking is that my table saw gets very little use since buying a track saw.

I will see your two sheds and raise you four sheds, two barns and a piggery.

I can't beat that ! lucky ------- . I am subtly building and converting the top of the garden into man caves but don't tell the missus, she hasn't twigged yet So far up there is summer house , 1 shed, 1 gazebo which is my temp workshop then the space for the new shed. Once I clear the site up goes the new shed and then she can have the space back where the gazebo was for the spa . Though she might not like all the saw dust I have left ..whoops !

 

[radiohead]

Just looked, a 20A C breaker has Zs max as 0.87 ohm which is probably met, but a 20A D is 0.44 ohms for 0.4s disconnection which is not likely to be met.

It is covered by a 30ma RCD, the maximum permitted Zs is 1667 ohms, the maximum for the overcurrent device is irrelevant.
Also the posted MW records a TT earthing system with a remarkably low recorded Zs, something doesn't add up, unless it is getting it via the bonding.

 

[Timbo]

What size cable is actually feeding the garage where the shed is fed from?