Rules and Guidelines
Want to participate in the discussions? Please read our Community Rules and Guidelines. Need some help? Visit Support and Answers.

  • State Not Answered
  • Locked Locked
  • Replies 38 replies
  • Subscribers 32 subscribers
  • Views 8022 views
  • Users 0 members are here
Options
You may also be interested in
This discussion is locked.
You cannot post a reply to this discussion. If you have a question start a new discussion

Oven & hob on 13amp fused spur

Former Community Member
Former Community Member
I’ve come across an electric oven and gas hob on a cooker circuit, the cooker switch feeds a 13a fused spur which powers both the Oven & hob, hard wired into a 32amp junction box.
the oven is rated at 13 amps but the hob 3 amps Is this acceptable as the hob is protected by a 13 amp fuse?

  • Former Community Member
    0 Former Community Member
    I doubt if the gas hob uses much electricity! Just there to provide an ignition spark I suspect.


    Regards


    BOD
  • 0
    Sounds messy, and check with the hob manufacturer's instructions.


    I doubt there is a real safety issue however - just about all consumer appliances these days will be designed the same for sale right across Europe - and 3A fuses are unknown outside of the UK/Ireland (and a couple of small ex-Empire areas) - so practically everything that could be plugged into a socket is expected to function safely on a 16A or even 20A OPD.


       - Andy.
  • 0
    Change the 32 amp JB into a DSO, 3amp plug, to the hob and a 13 amp plug to the cooker.


    regards...
  • 0
    AJJewsbury:

    Sounds messy, and check with the hob manufacturer's instructions.


    I doubt there is a real safety issue however - just about all consumer appliances these days will be designed the same for sale right across Europe - and 3A fuses are unknown outside of the UK/Ireland (and a couple of small ex-Empire areas) - so practically everything that could be plugged into a socket is expected to function safely on a 16A or even 20A OPD.


       - Andy.


    Hello Andy...


    I have had to read this several times... I don't think he means there's a '3 amp' fuse ~ rather that the hob is rated at '3 amps.' 


    regards...


  • 0
    I don't think he means there's a '3 amp' fuse ~ rather that the hob is rated at '3 amps.'

    I took the OP to mean that both the over and hob were fed by a single common 13A fuse - hence the perceived issue was the lack of 3A fuse protection for the hob.


    I'm with Bod - I very much doubt that a gas hob will draw 3A (what would a gas hob do with 700 Watts of electricity?) It'll just be for the gas ignition which'll draw the thermal equivalent of half of next to nothing.


       - Andy.
  • 0
    A 3 Amp hob won`t cook much will it Tom?
  • 0
    It will be fine, the uncertainty in the rating if the 13A fuse will be more than the average load of the gas - 4 sparks 3 times a day and perhaps a clock.

    The cable to the hob ought to be large enough to not fail during the blowing if the 13A fuse, and that is the only issue that may be a problem.

    M.
  • Former Community Member
    0 Former Community Member
    mapj1:

    It will be fine, the uncertainty in the rating if the 13A fuse will be more than the average load of the gas - 4 sparks 3 times a day and perhaps a clock.

    The cable to the hob ought to be large enough to not fail during the blowing if the 13A fuse, and that is the only issue that may be a problem.

    M.


    Yes, that was my issue. the cable supplying the hob is 0.75mm2 but protected by a 13a fuse


    both the oven & hob are protected by the same fuse (fused spur)


    Sorry, the 3 amp is what the hob manufacturer recommends for similar hobs (hob uses 6w for ignition)


    it does seem a strange way to install but I would guess the oven / hob has been replaced over the years


  • 0

    Yes, that was my issue. the cable supplying the hob is 0.75mm2 but protected by a 13a fuse

     





    As will likely be the lead for your kettle.
  • 0
    A short length of 0,75mm will be fine protected by a 13A fuse, or indeed a 16A breaker, so long as the load at the end of it is not sensibly going to be more than a few amps, and the credible failure mechanisms are either dead short or total open circuit.

    If it was feeding a socket,  that could not be guaranteed, as someone may plug in more than the  hob. However, hard wired like this I think the most likely faults are it stops working one day, or the cable gets pinched or melted by the oven, and the fault is a dead short. Both of those are safe outcomes.

    As others have noted a lot of short duration 13A appliances, such as kettles, toasters etc have a surprisingly thin lead anyway, and come to no harm - 0.75mm can carry 13A for some time, and against a dead short, the 13A fuse blows before the wire gets too hot. We could try the Adiabatic Formula on this if we felt the urge. I don't intend to as I've had an odd  beer this evening, and  that is when I post maths with errors, which is bad.

    Mike

Join us to get the best from IET EngX.

Joining EngX lets you personalise your experience so you stay up to date on the topics that interest you, plus you’ll be able to make connections who are looking to collaborate, exchange ideas and more.

Join us Not now

Community Rules & Guidelines