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Building a new garden shed - what electrical cable needed for supply

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  • 15-04-2011 10:47am
    #1
    wait4me
    Registered Users Posts: 2,050 ✭✭✭


    I am in the process of planning the build of a new shed at the bottom of the garden. Want to run an underground cable down to it. I will have a freezer and dryer down there as well as the obvious lights. If the weekend happens correctly for me I was hoping to run cable down to the site which I will be getting a qualified electrician to hook up to the fuse board in the house. Anybody give me a suggestion as to what rating cable should I bury in suitably insulated wavin/or some such piping?


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    #2
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Its an SWA cable thats needed, the size depends on how far the run is, but a 3 x 10 swa would cover most applications anyway. Inside a wavin is never a bad idea anyway although with SWA its not essential, but is a good idea. Others on here will tell you to bury it 2 foot down at least.


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    #3
    paddy147
    Banned (with Prison Access) Posts: 15,858 ✭✭✭✭paddy147


    wait4me wrote: »
    I am in the process of planning the build of a new shed at the bottom of the garden. Want to run an underground cable down to it. I will have a freezer and dryer down there as well as the obvious lights. If the weekend happens correctly for me I was hoping to run cable down to the site which I will be getting a qualified electrician to hook up to the fuse board in the house. Anybody give me a suggestion as to what rating cable should I bury in suitably insulated wavin/or some such piping?


    1-Trench (600mm deep)
    2-Hydrodare ducting/piping ( covered in and on top with 4-6 inch layer of sharp sand)
    3-3 core 10 square SWA (19mm diameter)
    4-IR Rated fuse board in garage


    Job done.:)

    P.S-While your trench is open then bring a mains water feed and a few alarm cables and/or a co-ax cable down into the garage aswell.

    Allways handy to have it alarmed,for security reasons and also be able to watch the TV too,if the missue ever bannished you to the garage,lol.:D


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    #4
    anton61
    Registered Users Posts: 22 ✭anton61


    Unless you are running a 200amp welder and extractor fans etc then 6mm sq cable is more than enough. if you are only running the item on you list with maybe a TV and then 2.5mm sq is adaquate. leave the cable directly in the earth this will increase the current rating of the cable as the heat is dissipated to the earth. SWA cable doesn't need any wavin or ducting.

    Anton


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    #5
    Bruthal
    Closed Accounts Posts: 13,422 ✭✭✭✭Bruthal


    Hardly have to worry about down rating a single cable because its in the ground in a wavin as compared to being directly in the ground though. Better to have minimum 6 square while newly building a shed.


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    #6
    anton61
    Registered Users Posts: 22 ✭anton61


    better to keep your option open for the future. 6 sq would be perfect and Cheaper then 10sq


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    #7
    M cebee
    Closed Accounts Posts: 4,431 ✭✭✭M cebee


    what's the length of sub-main(cable) then


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