1. Visiting from the US? Why not try DIYnot.US instead? Click here to continue to DIYnot.US.
    Dismiss Notice

Protection for 5 amp circuit (just curious)

Discussion in 'Electrics UK' started by StephenStephen, 29 Sep 2017.

  1. StephenStephen

    StephenStephen

    Joined:
    1 Apr 2008
    Messages:
    561
    Thanks Received:
    64
    Location:
    Devon
    Country:
    United Kingdom
    Hi all,

    I've a new 5 amp circuit, powering 4 round pin sockets for lights to plug into.
    I notice that the plugs have no provision for fuses, is that because this is protecting the circuit in the consumer unit (LIGHTS):
    DSCN4237.jpg
     
  2. Sponsored Links
  3. Risteard

    Risteard

    Joined:
    18 Jun 2010
    Messages:
    2,058
    Thanks Received:
    145
    Location:
    Derry, Ireland
    Country:
    Ireland
    That is not the correct device for that distribution board.
     
  4. mwatsonxx

    mwatsonxx

    Joined:
    6 Apr 2017
    Messages:
    785
    Thanks Received:
    50
    Country:
    United Kingdom
    Your 'LIGHTS' circuit is 6 Amps, and yes the breakers function is to protect the circuit cabling. The lamps are effectively self fusing in that when they breakdown (blow) they break the circuit, and electric flow stops.
     
    • Thanks Thanks x 1
  5. ericmark

    ericmark

    Joined:
    27 Jan 2008
    Messages:
    16,466
    Thanks Received:
    1,488
    Location:
    Llanfair Caereinion, Nr Welshpool
    Country:
    United Kingdom
    You really do need to explain with comments like that, I would guess you are referring to the consumer unit being a type tested unit and as such any item fitted must be permitted by the manufacturer so it is unlikely a castlec RCBO would be authorised by MK.

    However as far as the 5 amp sockets being protected well they are, both for overload and for earth leakage, as to lamps having internal fuses, yes that was the idea, but I had a 6 watt CFL fail and take out a B16 MCB so seems many don't have internal fuses, at least those from Ikea.
     
    • Thanks Thanks x 1
  6. stem

    stem

    Joined:
    20 Jul 2005
    Messages:
    6,262
    Thanks Received:
    1,393
    Location:
    Nottinghamshire
    Country:
    United Kingdom
    It's the same as the standard lighting circuit for your fixed ceiling lights. They will be connected to a 6A MCB without any additional fusing.

    Lamps that are plugged into 13A sockets supplied via a higher rated MCB (usually 32A) in the consumer unit need a 3A fuse in the plug to protect the cable from the plug to the lamp as it will only have a low current rating.
     
    • Thanks Thanks x 1
  7. Iggifer

    Iggifer

    Joined:
    8 Sep 2011
    Messages:
    4,637
    Thanks Received:
    586
    Location:
    Warwickshire
    Country:
    United Kingdom
    No excuse for fitting a Castlec MCB when MK MCBs are one of the easiest to get.
     
    • Like Like x 2
  8. Sponsored Links
  9. mwatsonxx

    mwatsonxx

    Joined:
    6 Apr 2017
    Messages:
    785
    Thanks Received:
    50
    Country:
    United Kingdom
    It's not a MCB, it's an RCD
     
  10. JohnD

    JohnD

    Joined:
    15 Nov 2005
    Messages:
    66,704
    Thanks Received:
    3,642
    Location:
    Coastal
    Country:
    Cook Islands
    it looks like a B6 30mA RCBO
     
  11. JohnW2

    JohnW2

    Joined:
    28 Jan 2011
    Messages:
    44,624
    Thanks Received:
    2,839
    Location:
    Buckinghamshire
    Country:
    United Kingdom
    Your being unnecessarily 'uncertain' - it clearly IS a B6 30mA RCBO!

    Ironically, that appears to indicate that the lighting has RCD (RCBO) protection but that the bathroom IR heater doesn't! I suppose that's probably because the 'new lighting circuit' has buried cables that needed RCD protection.

    Kind Regards, John
     
  12. Iggifer

    Iggifer

    Joined:
    8 Sep 2011
    Messages:
    4,637
    Thanks Received:
    586
    Location:
    Warwickshire
    Country:
    United Kingdom
    So it is, but my point still stands
     
    • Like Like x 1
  13. sparkwright

    sparkwright

    Joined:
    20 Aug 2009
    Messages:
    7,596
    Thanks Received:
    935
    Location:
    Dorset
    Country:
    United Kingdom
    Point well made Iggifer - anyone can get an MK RCBO to fit that consumer unit.
     
  14. ban-all-sheds

    ban-all-sheds

    Joined:
    27 Aug 2003
    Messages:
    69,784
    Thanks Received:
    2,857
    Location:
    London
    Country:
    United Kingdom
    But some people DGAS.
     
  15. DIYnot Local

    DIYnot Local

    Joined:
    3 Sep 2019
    Country:
    United Kingdom

    If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

    Select the supplier or trade you require, enter your location to begin your search.


    Are you a trade or supplier? You can create your listing free at DIYnot Local

     
Loading...

Share This Page