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Needs its own circuit, yes. Which is notifiable, so needs to be done by a sparky.
You could route the cable to a junction box, but be aware, the armouring of the cable needs to be earthed, so you need to make sure the outgoing cable from the box has the armouring earthed.
I don't quite get what the advantage of installing the cable to a box is before the ground works are ready. Why not just connect it after the cable has been laid?Personally I'd just try and lay the cable in a oner. It doesn't need to be connected to anything at either end - just make sure you have enough length for what you need. You could also lay ducting, ready to pull the supply cable through when you're ready.
It's worth noting that you may not need to bury the cable depending on what your garden looks like.
How far is the shed from the house?
Nef-
Yeah, that's why I said possibly homeowners thread - I'll not be doing any electrics, but the knowledge seems a bit better on this thread.
It's about 17m. The CU is in the middle of the house. The reason not to route it either through the nearer kitchen or the ground outside is that neither are due to be worked on any time soon; the bathroom floor is due to be ripped up next month, this will give an easy run from the CU to the outside of of the house. My thought was to run this (CU-back wall - ground level) and then, as you say, bury the cable as I get it all dug over the following couple of months (it can poke out above ground for the last 4m until I can get that dug over)
Sound like a sensible plan?
It's worth noting that you may not need to bury the cable depending on what your garden looks like.
What would that look like? It might be possible to hide the cable in/under some fence panels. Is it just a case of using conduit if it's above ground?
Polygon
Possibly more suited to the homeowner's thread but...
Exterior power, namely to a shed, it needs to be on its own circuit doesn't it?
Could I potentially get the cable routed to an external junction box on the side of the house until the back garden groundworks are ready?
I'm digging up my garden in various stages, last of which will be the back area for a shed base. I'd like that shed to have power eventually, but it won't exist for many months. The floor under which the first part of the circuit needs to go will be coming up next month, and the ground in between sometime in the middle.
@nefarious you seem to have recent experience in this area?