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  1. markyrp
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    markyrp DIY

    Location:
    United Kingdom
    Hi all,

    I have a bit of a dilemma. A friend wants power in an outbuilding adjacent to his house. I was going to run a fused spur from his kitchen using SWA. He is only looking to run a fridge and a single light. Ideally the CU would be quite close to an external wall but unfortunately it is quite central in the house so only real option is via a fused spur.

    My initial thought was to run the spur from one of the kitchen under counter sockets. Turns out that the socket I would need to use is supplied via a grid switch and is actually an FCU and has a dishwasher hardwired into it, as opposed to a plug and socket. What are your suggestions.
    There appears to be a lot of debate on spurs connected to spurs etc. My thoughts so far:

    1. Take a spur from the feed side of the existing appliance spur to another fused spur specifically for the outbuilding, fused at 13A. SWA from spur to outbuilding and into a 2 gang socket for fridge. Feed from 2 gang socket to a switched FCU, downrated to 3A to supply and protect lighting cct.

    2. Replace the appliance FCU with a 1 gang socket, put a plug on the dishwasher and then take an FCU from the socket which could then feed the outbuilding. Rest of the wiring as above.

    The cable run to the outbuilding is only approximately 3m in length so there wouldn't be a problem with voltage drop, etc.

    All thoughts would be welcomed
     
  2. LankyWill
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    LankyWill Electrician's Arms

    Location:
    Northants
    Is their a ring final at the dishwasher fcu? Or is it a radial?
     
  3. markyrp
    Offline

    markyrp DIY

    Location:
    United Kingdom
    Thanks for the quick reply. The grid switch is on a ring final and the FCU is fed via the module grid switch.
     
  4. Des 56
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    Des 56 Trusted Advisor

    Location:
    Gliese 581C
    If i understand what you are proposing
    You are going to end up with a Dishwasher,a Fridge and the lights all via the 20 amp Grid switch?
     
  5. markyrp
    Offline

    markyrp DIY

    Location:
    United Kingdom
    Yes. The fridge has a power rating of 64W and there would be 1 light (maybe 60W).
     
  6. LankyWill
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    LankyWill Electrician's Arms

    Location:
    Northants
    You could break into the ring at the grid switch and add a fuse carrier module and switch module. You might need to chop in a double box of course, i wouldn't recommend removing the FCU. Adding a plug to the dishwasher would be a step backwards. Take the twin to an adaptable box and run the rest in armoured.

    Metal clad sw fused spur in garage with a 3A fuse for light and add a socket of the supply side. Test and Certificate!
     
  7. markyrp
    Offline

    markyrp DIY

    Location:
    United Kingdom
    I have adaptable boxes for both the outside of the property and the outbuilding. was going to run the rest in t&e. Are you saying to leave the dishwasher hardwired and run t&e from the supply side of the FCU?
     
  8. LankyWill
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    LankyWill Electrician's Arms

    Location:
    Northants
    Yes thats exactly what I'm saying, i have just noticed the DIY banner on your avatar. Are under supervision of a qualified electrician? I feel i have said too much.
     
  9. markyrp
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    markyrp DIY

    Location:
    United Kingdom
    I am an aircraft engineer by trade. I have done a domestic installers course, 17th Edition and C&G 2391 but I don't really do domestic work normally.
     
  10. LankyWill
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    LankyWill Electrician's Arms

    Location:
    Northants
    Phew, i thought i gave the secrets to Dave from the Pub! Sounds like you should be fine, just remember to check bonding and earthing arrangements before you start and check the circuit has rcd protection.
     
  11. markyrp
    Offline

    markyrp DIY

    Location:
    United Kingdom
    Thanks for the input.
    The house is only about 10 years old. It is PME system and all the sockets are RCD protected.
     
  12. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    any exposed metal pipe work in the shed !
     
  13. markyrp
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    markyrp DIY

    Location:
    United Kingdom
    It's a brick construction outbuilding. The only exposed metal is the nail plates for the roof timber. No pipework and cable will be ran in surface mounted plastic conduit.
     
  14. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    who is part p this work!
     
  15. markyrp
    Offline

    markyrp DIY

    Location:
    United Kingdom
    The installation is in Scotland. No part P.
     
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