Quite a lot not right here
Hi, Shed is at bottom of garden
Want to run power to it
Was planning on digging trench and putting wire in white plastic tube then burying it.
No you don't, per the above, armored cable is required
Is there a set depth I should bury it?
Yes, depends on the route. If under flower beds/lawn then recommended depth is 450mm. Cable thewn needs to be bedded on sand, caver 1/3rd depth with soil, then warning tape, then finish the fill
Was going to put a small consumer unit on the end in the shed
Well yes, thats the usual way to do it. Will the CU include an RCD? What value breakers will you have in it, what will you be powering in the shed, what is the characteristics of your supply? Are there any services (like water) in your shed? Where will you feed it from in the house (spur from a ring, direct from a new fuse in the fueboard???)
Was going to use standard 15A cable for the run.
There's no such thing. the cable carrying characteristic of a cable is determined by many factors. The csa of the conductor is one issue, how it is run, environment etc have a bearing it. Also you need to work out the voltage drop. All of this will determine the size of cable for your appplication.
And as stated above, this is notifiable work. from your questions i would strongly suggest you get a spark in, most will let you do the donkey work & he can do teh technical bit and sign it off and notifiy the local authority.
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