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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? 



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    Eclipse:

    . . . the incomng supply is tnc-s, so initially i was thinking of spliting the incoming tails through blocks and installing a single enclosed MCB which the SWA would terminate to, this then leaving the RCD at the shed end, correct or not?




    Correct. You don’t really need to protect the SWA with an RCD as long as you can operate the protective device from the far end in the event of a short to the armour. As John said, you need to insulate the armour and take just the phase and neutral into the consumer unit in the shed. The earth would then come from a local earth rod, ideally less than 200 ohms. 


    Regards,


    Alan. 

Reply
  • 0

    Eclipse:

    . . . the incomng supply is tnc-s, so initially i was thinking of spliting the incoming tails through blocks and installing a single enclosed MCB which the SWA would terminate to, this then leaving the RCD at the shed end, correct or not?




    Correct. You don’t really need to protect the SWA with an RCD as long as you can operate the protective device from the far end in the event of a short to the armour. As John said, you need to insulate the armour and take just the phase and neutral into the consumer unit in the shed. The earth would then come from a local earth rod, ideally less than 200 ohms. 


    Regards,


    Alan. 

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