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So my running a 25m extension cable through a load of bushes to my shed isn’t legit?
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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?
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andos
Nef
@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?