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shed supply

Eclipse
Guys,

Just some advice please! 

my son has installed a new 6m/m 3C SWA supply to his new wooden shed,( no extranous parts) its going to be terminated into a 4 way consumer unit (RCD main swt) and used to power & lighting in the shed and some lighting in the garden,

question is:

The source end in the house is a twin RCD board, so using a spare way on either side will give the supply cable RCD protection, but what about the RCD in the shed board? is it advisable to keep both? 



Parents
  • 0
    If your shed is all wooden with a wooden floor or a concrete floor with a DPC and no extraneous parts  then then the risk of shock in the event of the loss of the PEN is low. So you could supply the shed with an SWA cable from a non-RCD circuit relying on the over current protection to protect the SWA cable.Then a garage type consumer unit with a 30mA RCD main switch.  You still have the risk of the outside lighting but this could be minimized with the use of Class 2 fittings.


    If you want to reduce the risk further for PEN loss run the SWA cable as before but insulate the armour wire at the shed end and terminate the SWA in a Wiska gland in to the CU. Over sleeve the line and neutral and take the conductors straight to the main switch keeping them as short as possible.Connect an earth electrode to the earth bar and make sure the earth resistance is as low as possible ideally under 200 ohms.
Reply
  • 0
    If your shed is all wooden with a wooden floor or a concrete floor with a DPC and no extraneous parts  then then the risk of shock in the event of the loss of the PEN is low. So you could supply the shed with an SWA cable from a non-RCD circuit relying on the over current protection to protect the SWA cable.Then a garage type consumer unit with a 30mA RCD main switch.  You still have the risk of the outside lighting but this could be minimized with the use of Class 2 fittings.


    If you want to reduce the risk further for PEN loss run the SWA cable as before but insulate the armour wire at the shed end and terminate the SWA in a Wiska gland in to the CU. Over sleeve the line and neutral and take the conductors straight to the main switch keeping them as short as possible.Connect an earth electrode to the earth bar and make sure the earth resistance is as low as possible ideally under 200 ohms.
Children
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