New CU

Discussion in 'Electricians' Talk' started by Coloumb, Nov 28, 2015.

  1. Coloumb

    Coloumb Screwfix Select

    Ok lads, I've had a few glasses of red so I'm going the throw up a couple of pics of the CU of the project I've been working on for the last year or so. Last time this happened everyone fell out over a bit of insulation tape if I recall.

    Anyway, here it is. Split load, all the ground sockets done as 16amp radials in batches of three double sockets (prob should have been 20amp but there you go, get over it), only ring is the first floor. Separate sub main for the shed, rcbo for the smokies, all fed from 16mm swa. It's 3 phase swa so I used heat shrink for the sleeving (not insulation tape). 4mm radials for the kitchen white goods sockets. Not a amd 3 unit, if it sets on fire it will only burn me up so that's cool.

    Yes I will fill in the top bot and the holes where from an idea that didn't work out.

    IMGP7634 - Copy.JPG IMGP7635 - Copy.JPG
     
    FatHands likes this.
  2. JP.

    JP. Screwfix Select

    Excellent Mr C. Do all the circuit numbers marry up? For instance if the immersion heater radial earth was connected to say no 6 on the earth bar, does the neutral go into no 6 on the neutral bar? Only an example
     
    Coloumb likes this.
  3. Coloumb

    Coloumb Screwfix Select

    The all match up matey, note the numbers on the safety barrier.
     
  4. DNR Plumbing

    DNR Plumbing Active Member

    Looks nice and neat I'm not a spark but thought smoke alarms should be on a non RCD MCB not even a rcbo as they could trip sooner and they are the last thing you want loosing supply
     
  5. JP.

    JP. Screwfix Select

    Excellent Mr C and recharge your glass - some people just stick them in willy nilly, no good whatsoever,
     
    Coloumb likes this.
  6. JP.

    JP. Screwfix Select

    I always run my smokes etc off of a principal lighting circuit Mr D
     
  7. DNR Plumbing

    DNR Plumbing Active Member

    Ok mine are separate on a MCB that's not RCD protected along with burglar alarm and fridge all on separate MCB's
     
  8. Coloumb

    Coloumb Screwfix Select

    :cool:
    They need to comply with the 17th so need to be on a separate ctt. with it's own rcd/rcbo.
     
  9. CGN

    CGN Screwfix Select

    Prob is, tennants can switch off alarms then!!
     
    DNR Plumbing likes this.
  10. Coloumb

    Coloumb Screwfix Select

    That's up to them mate, I've already discharged my obligations...
     
  11. DNR Plumbing

    DNR Plumbing Active Member

    All separate cct's but do they need RCD protection or not?? Split load CU with 3 live bus bars 2x RCD ones and 1 non RCD with smokes burger and fridge on does it conform??
     
  12. seneca

    seneca Screwfix Select

    The recommendation is on a regularly used lighting circuit, it's then immediately obvious if tripped.
     
    DNR Plumbing likes this.
  13. Coloumb

    Coloumb Screwfix Select

    Well mine are on their own ctt with an rcbo. And I like it like that. :):p
     
    KIAB, Brian_L and DNR Plumbing like this.
  14. Is your shed fed by the 16mm SWA? Just wondering how you have terminated it in the CU?
     
  15. Jitender

    Jitender Screwfix Select

    Looks more like 4 or 6mm SWA for the shed
     
  16. DNR Plumbing

    DNR Plumbing Active Member

    Looks like 4mm to me
     
  17. retiredsparks

    retiredsparks Super Member

    Nice.
    like the pigtails, bit of spare to play with.
    Prefer not to have one on main earth conductor.
    prefer to see the main tails (and others)set below the busbars...to avoid rubbing(vibration) and being pressed by the front cover.
    RS
     
    Coloumb likes this.
  18. Coloumb

    Coloumb Screwfix Select

    It's 16mm in and 6mm to the shed. You can just see the glands to the left.
     
  19. Phil Hyde

    Phil Hyde Active Member

    Why is shed on a non Rcd protected breaker. Surely the cable runs outside? Is the shed on a Tt or have you exported the earth?
     
  20. JP.

    JP. Screwfix Select

    The shed sub circuit is done in SWA - there is no indication within the parameters of Mr C's db deployment that this swa sub circuit needs rcd protection (ads satisfied). Obviously at shed end the circuits which are fitted/being fitted will be rcd/rcbo protected Phil.
     

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