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Discuss Fuse 13amp but states 5amp in the Oil and Solid Fuel Forum area at UKPlumbersForums.co.uk.

  1. Inverness

    Inverness Plumber GSR

    hi oil heads,
    Most oil boilers that I service when I isolTe the fuse and take it out, it's never the correct size it should be 13amp most times. Should I leave it or replace it for what it says to be in the spec of boiler manual.
     
  2. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    What manual says / spec
     
  3. Inverness

    Inverness Plumber GSR

    So if I replace it for e.g. 5amp as it says in the manual it will be good and nothing bad can happen
     
  4. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    yep
     
    • Like Like x 1
  5. Murdoch

    Murdoch Active Member

    13A are just because fused spurs come with them in - and rarely do people bother to fit the correct rating....

    Fitting the size indicated by the boiler manufacturer is best ...
     
  6. Gasmk1

    Gasmk1 GSR

    one of the biggest no no's when corgi or as now known gas safe find wrong fuse size installed, must be to MI's some boilers are 10amp fuse not easy to get hold of (think kestons)
     
  7. Murdoch

    Murdoch Active Member

    10A fuses, along with 5A and 3A are easy to buy ..
     
    • Agree Agree x 2
  8. Last Plumber

    Last Plumber Plumber GSR Top Contributor!!

    7 Amp too.
     
  9. Darren Jackson

    Darren Jackson Plumber GSR

    Warranty is also invalid if 13 amp fuse is left in. Just redone my ACS 4 weeks ago and this came up. We have to AR the appliance if you come across it as NCS doesn't exist anymore. So just replace it with correct size as per MI's.
     
  10. Gasmk1

    Gasmk1 GSR

    they are now when i needed some several years ago they were a bugger to find you can even get them from wilko, i had to get thhem from internet search
     
  11. Best

    Best Trusted Plumber Top Contributor!!

    I also find most oil boilers I go to have 13 amp fuses. That is if they actually have any switches, fused or otherwise.
    I blame the electricians on new builds for doing final wiring to them, as well as the heating installers, but on private houses it is often the plumber at fault.
    Seems odd that fused spurs are sold with the maximum sized fuse - 13 amp, yet they could be simply for a fused isolator to supply a mere 10watt led light.
    I would want a fuse to blow at the earliest time possible when a fault occurs, like a dead short.
    Got to remember a fuse is also to prevent the wiring to the appliances from melting and also the small wires and components of appliances from melting or being destroyed by a dead short, plus avoiding the obvious fire or electrocution risks.
     
    Last edited: May 8, 2018
  12. quality

    quality Plumber GSR

    only 13 and 3 are now listed in the 17th edition and has been that way since the last amendment. The fuse protects the cable not the appliance thats it feeds
     
    • Agree Agree x 1
  13. Murdoch

    Murdoch Active Member

    Some are sold with 3A fuses
     
    • Informative Informative x 1
  14. ShaunCorbs

    ShaunCorbs S. Mod Trusted Plumber GSR Top Contributor!!

    any sold without ? maybe the way forward then you can use the appropriate rating / size correctly?
     
    • Agree Agree x 1
  15. Murdoch

    Murdoch Active Member

    The 3A ones are more expensive than the 13A ones .. I just buy packs of the other sizes of fuses as I need them

    Anyone want a bag of 13A fuses?:)
     
    • Funny Funny x 3
    • Agree Agree x 2
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