earth for garage project

Discussion in 'Electricians' Talk' started by mannock, Apr 16, 2015.

  1. mannock

    mannock New Member

    When is a dedicated earth and spike required for a building? My 'hobby room in detached garage' project has 3 core 4mm armoured cable from the house CU to the garage CU which is a metre away, will it need an earth, what size, and where can the spike go? The cable is fitted with metal internal gland kits both ends and both CU's are plastic. Thanks for any advice.
     
    mannock, Apr 16, 2015
    #1
  2. stateit

    stateit Screwfix Select

    Hi OP,

    i) Have you got any metallic water/gas feeds or other extraneous-conductive-parts coming in to the shed.
    ii) Is your supply earthing system PME (there will be a label attached at the main incomer if it is) ?

    If you answer 'Yes' to both then you don't export your house installation earth to the shed, and use an earth-rod instead.

    Otherwise you can export the house earth to the shed.
     
    stateit, Apr 16, 2015
    #2
  3. nigel willson

    nigel willson Screwfix Select

    earth rod ! and 30Ma RCD!
     
    nigel willson, Apr 16, 2015
    #3
  4. retiredsparks

    retiredsparks Super Member

    Too may questions......get a good experienced sparks in and give him a living.
    RS
     
    retiredsparks, Apr 17, 2015
    #4
  5. Risteard

    Risteard Screwfix Select

    ... OR an appropriately sized main protective bonding conductor.
     
    Risteard, Apr 17, 2015
    #5
    nigel willson likes this.

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