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Too many circuits?

Discussion in 'Electrics UK' started by veedee, 20 Nov 2020 at 7:57 AM.

  1. veedee

    veedee

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    Rewiring a 4 bed house and would like to know whether i am on the right track or if i have an unnecessary amount of circuits

    Ring Main upstairs (32a)
    Ring main downstairs (32a)
    Lighting circuit upstairs (6a)
    Lighting circuit downstairs (6a)
    Kitchen ring (32a)
    Cooker (40a)
    Boiler (16a)
    Doorbell?

    All to go in here will be in a BG 10 way dual rcd consumer unit
     
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  3. terryplumb

    terryplumb

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    Doorbell on its own circuit isn't really necessary . An electric shower ,if having one ,would need a circuit.
     
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  4. HERTS P&D

    HERTS P&D

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    Garage, Worksop, EV (car charger) extra ring for loft conversion?

    Andy
     
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  5. veedee

    veedee

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    Great shout Andy. A loft conversion will be done a few years down the line

    So it makes sense to put a ring up there ready for it

    If I do that, i guess I'd better put another lighting circuit up there too?

    Are people really future proofing with EV circuits?

    I think, I'm gonna need a bigger consumer unit :D:D
     
  6. Taylortwocities

    Taylortwocities

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    If you are doing this work you shouldn’t need to ask!

    but two constructive points.

    Why dual RCD? All RCBO is the better way!

    our leaders have declared its all electric (new) vehicles in 10 years time. Your new rewire and CU will be there for several decades, so provision for EV would be sensible. The requirements for EV are changing all the time (just look at the RCD type and TT issues). These will surely be different in 2030, so may need to guess what they’ll be at that time.
     
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  7. veedee

    veedee

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    Cost. All RCBO is too expensive

    Thanks for the help Doc!
     
  8. Taylortwocities

    Taylortwocities

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    It’s not expensive if you choose the consumer unit carefully. It also better complies with the separation of circuits reg.
     
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  9. EFLImpudence

    EFLImpudence

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    You won't need a 'ring' for the loft.

    Probably not for upstairs, downstairs (apart from kitchen), possibly not kitchen either.
     
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  11. endecotp

    endecotp

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    Count the number of circuits you have today and get a consumer unit with N spare positions. But what is the value of N?

    One school of thought is that the CU should last for several decades, during which time you my want to add all sorts of new things (vehicle chargers, loft conversion etc.) so N is large.

    Another school of thought (more cynical perhaps) is that every time you want to add something, there will be some reason why you have to replace everything. For example: MCBs are not longer made for that CU, “this CU was obviously a DIY install and I’m not going to touch it”, regulations have changed and now CUs have to be made of unobtainium. So N is small.

    BTW, I would also recommend RCBOs. You should also budget for hiring a multifunction tester for a week so you can test it when you’ve finished. If you might sell before you die, think about how you’re going to fake the paperwork!
     
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  12. veedee

    veedee

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    Oh wow.. Really?

    Cost of BG 10 way at screwfix comes in at £68

    Specs are as follows
    • 100A Mains Switch
    • 2 x 63A 30mA RCDs
    • 10 x MCBs (3 x 6A, 2 x 16A, 4 x 32A & 1 x 40A)
    Which consumer unit would you recommend i get? I'd love to have one with RCBO :D

    I don't mind paying a little extra as it will be a better job

    You're right, it is a bit excessive for the loft.
    Radial it is then!

    Not sure what people will get up to in the other rooms though (especially the kitchen) so not taking any chances with a radial

    Thanks for the help
     
  13. veedee

    veedee

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    Hysterical! :ROFLMAO:

    I think its probably best to get a CU with some spare positions

    I was hoping to do the wiring and have a sparky fit the CU..

    Any chance of this, or will most sparkies say 'no chance' to this proposition?
     
  14. EFLImpudence

    EFLImpudence

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    It doesn't matter what they get up to, a radial does not mean less capacity.
     
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  15. JohnW2

    JohnW2

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    As I always say, I think that people worry far too much about this.

    If there is no 'paperwork' available in relation to past electrical work (which is very common), one simply says so - and 'faking' paperwork is the very last thing one should even consider. If a prospective buyer wants to have an EICR undertaken (at their cost), that is their choice/business (just as it is with structural survey).

    Kind Regards, John
     
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  16. RF Lighting

    RF Lighting

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    Here’s the last 4 bedroom house I rewired.

    2A55F6DD-864F-4E0F-9C8C-C4106BFF8573.jpeg

    1. EV charger (blanked off)
    2. Cooker
    3. Downstairs ring
    4. Kitchen / utility ring
    5. Upstairs ring
    6. Washing machine / tumble dryer
    7. Garage
    8. Router / network switch
    9. Outside socket
    10. Downstairs lights / doorbell
    11. Upstairs lights
    12. Outside lights
    13. Alarm / cctv
    14. Central heating
    15. Bathroom towel rail
    16. Smoke / CO alarms
     
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  17. HERTS P&D

    HERTS P&D

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    Very Nice.

    Andy
     
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