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  1. Kash
    Offline

    Kash EF Member

    Location:
    London
    Hi,

    I am currently having my whole house renovated and I am also having a new outhouse built (brick/block cavity wall etc..). We want to put a small kitchen in the outhouse and so will need to run Gas and Electric etc... We will also be putting the boiler and unvented cylinder in the outhouse.

    I already know about the trench requirements etc... I would like to know about cable, consumer unit requirements.

    I wont be doing any of the work my self and will be bringing a qualified electrician, but I like to know the best approach with these things, which why I am here.

    I have read you can spur off the original house CU, as long as you use the side that is not connected to the RCD? Is that even the case when having a oven etc... ? I understand the CU in the house will have it's own RCD so that should cover it, just wanted confirmation?

    Also in regards to cable its about 20m (max) from the outhouse to where the current house consumer unit (main fuse) is. What thickness armored cable would be recommend?

    We will most likely have to upgrade the existing consumer unit as we are also building a extension and building a dormer and there aren't enough mcb's in the current unit, what would be the recommendation for the size of unit?

    The house will be (after extending) 5 Bed, 2 Bath, 2 Reception, a WC, Kitchen then outhouse with another small kitchen (with the boiler and cylinder).

    I hope I have provided enough information.

    Appreciate any advice given.
     
    • Optimistic Optimistic x 1
    • Creative Creative x 1
  2. Leesparkykent
    Offline

    Leesparkykent Super Moderator Staff Member Super Moderator

    Location:
    Kent
    Sorry there is no where near enough information. The best advice any one could give is to get your electrician involved now at design stage. One thing I will say is you would be better with a switch fuse for the distribution circuit for selectivity.
     
    • Agree Agree x 5
  3. Paignton pete
    Offline

    Paignton pete Regular EF Member

    Location:
    Over the rainbow
    Agree with above. Your sparky will give you all the answers you need.
     
    • Agree Agree x 2
  4. anthonybragg
    Offline

    anthonybragg Electrician's Arms

    Location:
    NORTHAMPTON
    Business Name:
    CHARLTEC ELECTRICAL LTD
    As you said you are employing an electrician to do the work so they will be designing it. The cable size will depend upon many factors including load allowing for diversity (not all loads on together) As for consumer unit size this will depend on what existing circuits you have and additional new ones but the best option would be all RCBO's
     
    • Agree Agree x 1
  5. Spoon
    Online

    Spoon Forum Mentor

    Location:
    Lancashire
    I'm also with the above posts. Have a word with the electrician who will be installing and testing the circuit to the outhouse. He/she will tell you what is best.

    One option is, add an extra CU next to the existing one. This way you are not touching the existing CU. This will save money. Again, have a word with the electrician. He/she will advice on this.
     
  6. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    Not sure I agree with that ... the whole house is being renovated and extended ..

    The on-site spark is the person to ask and decide
     
    • Like Like x 1
  7. Spoon
    Online

    Spoon Forum Mentor

    Location:
    Lancashire
    True mate but it sounds like the OP is not touching the existing wiring. I may have misread it... Maybe the OP can clarify please.
    There are may ways to skin a cat.. I suggested one... :)
     
    • Optimistic Optimistic x 1
  8. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    It's a poorly described situation ...

    I read it as if the main house boiler and tank are going tio be in the outhouse 20 metres from the main house
     
    • Agree Agree x 2
  9. goasis
    Offline

    goasis EF Member

    Location:
    berks
    Why do you need to know any of this?
     
    • Agree Agree x 1
    • Funny Funny x 1
  10. Spoon
    Online

    Spoon Forum Mentor

    Location:
    Lancashire
    What is this referring to?
     
    • Agree Agree x 2
  11. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    My guess if the OP

    The poster has been on this afternoon and reviewed the responses ...... fingers crossed he's got responses "held" by the mods for approval!
     
    • Like Like x 1
  12. goasis
    Offline

    goasis EF Member

    Location:
    berks
    Just wondering why the customer needs quite so much detail about the install...
     
  13. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    That’s blindingly obvious ....
     
    • Like Like x 1
  14. Spoon
    Online

    Spoon Forum Mentor

    Location:
    Lancashire
    Could be that the OP is intending to do the job himself or that he is just curious as to what is needed.
    If the OP is actually "bringing a qualified electrician" to do the work then they need to have a word with the electrician about the best way to do this and what is needed. After all, the electrician will be putting their name down on the cert and notifying the relevant authorities.
     
    • Agree Agree x 2
    • Like Like x 1
  15. DPG
    Online

    DPG Electrician's Arms

    Location:
    S Yorkshire
    Too many specific questions from the OP. And why don't they ask the spark who will be doing it?

    Answers on a postcard (not you Murdoch)
     
    • Funny Funny x 2
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