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Electric Fuse box problem.

Discussion in 'General Discussion' started by kmufc77, Jun 25, 2012.

  1. kmufc77

    Mobster

    Joined: Jul 15, 2007

    Posts: 4,836

    Location: South West

    Hi

    Im after some advice from ppl who know stuff about electrics and fuse boxes please.

    I keep getting light bulbs blowing downstairs in my kitchen, there is only ever 2 lights that blow which are the bulbs that are above my cooker in the cupboard units, and occasionally the main light in the centre of the celling which is just a standard bulb.

    The lights in the cupboards have there own light switch as does the main light in the kitchen if that matters?

    When the bulbs blow my fuse box switch for all the lights in the house is tripped.

    Im just after some advice to why this is happening, ive replaced around 10-15 bulbs in around 2 months with the fuse box tripping on a number of occasions.

    The fuse box looks pretty new imo and not dated at all.
     
    Last edited: Jun 25, 2012
  2. Rodneypooleg

    Wise Guy

    Joined: Feb 22, 2007

    Posts: 1,992

    Location: UK

    Don't you need to switch everything off then turn on one at a time and see if they go.
     
  3. Vita

    Sgarrista

    Joined: Mar 26, 2006

    Posts: 9,307

    Location: United Kingdom

    What is the wattage of the bulbs? I'd start with turning all lights off, and starting one at a time. Maybe the amp in the fuse box is low for the lights you are putting on in the kitchen?
     
  4. HardwareGeek

    Hitman

    Joined: Oct 17, 2010

    Posts: 886

    If i'm reading this right, your fuse box only trips when the bulbs blow? and it works fine until they blow.

    If so this is totally normal and will happen more or less often depending on the type of fuse box you have, the type of bulb that blows and how it fails.

    For example a normal incandescent bulb has a tungsten filament, when this breaks in the middle say, you get an arc when the electricity is jumping the gap between the ends, this causes more current to flow and trips the fuse etc.

    You can either put up with the inconvenience and maybe change to low energy bulbs to reduce how often they blow or..

    Get an electrician in to change your (Guessing abit here) B type 6A MCB to a C type, which is less sensitive to short overloads, but you would need a sufficiently low earth loop impedance reading to use a c type breaker.
     
    Last edited: Jun 25, 2012
  5. HardwareGeek

    Hitman

    Joined: Oct 17, 2010

    Posts: 886

    Just seen this, replaced the bulbs that quickly in the same fittings?

    If so it seems far too often, are they cheap bulbs like B&Q or branded, that might make a difference, also the fittings may have seen better days.

    For example E27 screw fittings like older R80 style fittings can blow bulbs faster when they age because the centre contact in the lamp holder bends back and makes poor contact with the bulb causing overheating, temp fix for this is to bend the contract out abit, permanent fix is a new fitting.

    PS. What fitting/bulb types are playing up? im guessing the cabinet lights are probably G4's? little halogen bulbs with 2 prongs that slide into the fitting? these have a life of 2000hrs i believe.
     
    Last edited: Jun 25, 2012
  6. kmufc77

    Mobster

    Joined: Jul 15, 2007

    Posts: 4,836

    Location: South West

    Hi

    Ive checked the wattage and they are the correct bulbs according to the light fittings.

    As for for the amp in the fuse box, i havent a clue and this is something i could look at.
     
  7. kmufc77

    Mobster

    Joined: Jul 15, 2007

    Posts: 4,836

    Location: South West

    The lights are E14's and they just screw into the fittings. forgot to mention that i also have 3-4 halogen bulbs that have all blown in the bathroom as well, but those bulbs have blown over 12 months and do not trip the fuse box
     
  8. kmufc77

    Mobster

    Joined: Jul 15, 2007

    Posts: 4,836

    Location: South West

    Most times, but there has been a few occasions where the bulb just blows and the fuse box is ok and does not trip. But 90% of the time the fuse box does trip all the lights.

    Could this be an earthing problem with the electrics particularly the lights ?
     
    Last edited: Jun 26, 2012
  9. neodude

    Mobster

    Joined: Nov 18, 2007

    Posts: 3,021

    Location: West Lothian

    The fuse blowing when a bulb goes is completely normal, so nothing wrong with your fusebox. Can you not replace the bulbs with low voltage alternatives? These tend to be hardier.
     
  10. daz87uk

    Hitman

    Joined: Nov 30, 2008

    Posts: 929

    Location: Newquay

    Cheap bulbs, loose fittings or higher than average voltage to your home. The bulbs take out the breaker because the resistance changes before it blows. A higher voltage 5% will shorten the life of bulbs by 50%. My bet is you've got some dodgy fittings or your voltage is a bit high coupled with a cheap bulb with low voltage tolerance
     
    Last edited: Jun 26, 2012


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