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

overheating neutral link

Discussion in 'Electrics UK' started by sparkymarka, 22 Apr 2011.

  1. sparkymarka

    sparkymarka

    Joined:
    16 Feb 2011
    Messages:
    8,901
    Thanks Received:
    1,351
    Location:
    Sheffield
    Country:
    United Kingdom
    hi any advise would be helpfull. just looked at a mates fuseboard because he could smell burning everything looked ok untill i spotted the main neutral link bar from the main switch which links the two rcd split loads looked overheated have checked and it seems tight, this only happens when they use the shower 9.5-8.3 kw via a 40amp mcb
     
  2. Sponsored Links
  3. pjcomp

    pjcomp

    Joined:
    22 Jun 2010
    Messages:
    556
    Thanks Received:
    76
    Country:
    United Kingdom
    What's the cable from the CU to the shower? If it's a 6mm and a longish cable run that could well come under stress from a 9kw shower, but the 40A MCB is slightly too big for the cable.

    PJ
     
    • Thanks Thanks x 1
  4. sparkymarka

    sparkymarka

    Joined:
    16 Feb 2011
    Messages:
    8,901
    Thanks Received:
    1,351
    Location:
    Sheffield
    Country:
    United Kingdom
    hi i think its a 6mm about 3m to shower switch and about 4-5m to shower
     
  5. ban-all-sheds

    ban-all-sheds

    Joined:
    27 Aug 2003
    Messages:
    69,782
    Thanks Received:
    2,858
    Location:
    London
    Country:
    United Kingdom
    The longer the cable the less stress it will be under.
     
  6. spanky

    spanky

    Joined:
    17 Aug 2008
    Messages:
    19
    Thanks Received:
    1
    Location:
    Edinburgh
    Country:
    United Kingdom
    Have you checked "neutral link bar" is actually in U clamp under main switch as have seen a few where it is not in the clamp and just touching?

    Also does main switch feel "gritty" when operated as some times a lack of care during install can lead to crud in switch contacts?

    sorry if this is teaching you to suck eggs ;)
     
    • Thanks Thanks x 1
  7. Sponsored Links
  8. sparkymarka

    sparkymarka

    Joined:
    16 Feb 2011
    Messages:
    8,901
    Thanks Received:
    1,351
    Location:
    Sheffield
    Country:
    United Kingdom
    hi main switch feels fine the neutral seems to be overheating where it connects to the strip at the top of the consumer unit and splits off to feed the two rcd's this is where i find it strange can understand if it was getting hot at the fuse input ? thanks for the input
     
  9. canduit

    canduit

    Joined:
    1 Jul 2009
    Messages:
    273
    Thanks Received:
    15
    Location:
    London
    Country:
    United Kingdom
    I thought the longer the cable is, the higher the resistance would be?
     
  10. vsynth

    vsynth

    Joined:
    7 Dec 2007
    Messages:
    196
    Thanks Received:
    3
    Country:
    United Kingdom
    Higher resistance = lower current so the longer the cable the less 'stress' it will be under.
     
    • Thanks Thanks x 1
  11. ban-all-sheds

    ban-all-sheds

    Joined:
    27 Aug 2003
    Messages:
    69,782
    Thanks Received:
    2,858
    Location:
    London
    Country:
    United Kingdom
    It will, therefore the current will be lower, i.e. less "stress".

    [edit]Doh! Too slow.... [/edit]
     
    • Thanks Thanks x 1
  12. canduit

    canduit

    Joined:
    1 Jul 2009
    Messages:
    273
    Thanks Received:
    15
    Location:
    London
    Country:
    United Kingdom
    Sparkymarka "thinks its a 6mm cable." Would it be wise to confirm this? ie. if the cable csa is too small this could cause the smell?
     
  13. 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