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My temporary* set up is off an outdoor socket which is off the kitchen circuit. Exterior rated (for whatever that is worth) extension lead out to the shed. I did set up a "proper" wiring set up in the shed with it's own CU (a 6a circuit for two LED strip lights and the sockets running off a 16a RCD, when I get it done properly, I will probably move the sockets onto the 32a RCD but as it stands, the 13a fuse in the plug is the bottle neck anyway), but the input tail of that CU is just a length of 2.5mm2 wired into a round hookup style plug with the mating side of that connection wired by flex to a standard 3 pin plug - the flex meaning I'm not constantly bending and fatiguing the solid 2.5mm2 and risking it breaking. The 13a 3 pin plug on the end gets plugged into the extension lead when I'm in there, and unplugged when I leave. I wouldn't trust it to leave unattended. The end goal is to have an armoured cable run from it's own RCD on the main CU when we get the back of the house re-done. But for now it works for me. I managed to trip the kitchen RCD when doing something stupid, so I know that works. Since then, an actual grown up spark winced and told me to at least swap the outdoor socket for an RCD protected one in case the extension lead gets damaged, which I have done.
*it's been like this for about a year or so now
My excuse/internal reasoning for this set up is that it is no different to rocking up with a caravan and plugging an extension lead into that.
Right - shed power - it has been asked before. Situation is that the house CU is at the front and we are a terrace with solid floor so running a circuit off that is not an option. There is a switched socket next to the back door handily close to the virgin media trunking which runs right by the shed. I don’t need a proper lighting / power circuit in the shed - just 3 plugs - one for a lamp, one for a laptop one for screen. Is it wildly irresponsible to just run a 10m extension cable (on the basis that I would remove if we ever sold) or is there a more legit diy option ? or additional bits like RCD plugs etc. who’s our resident leccy ?