The IET is carrying out some important updates between 17-30 April and all of our websites will be view only. For more information, read this Announcement

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 31 subscribers
  • Views 7938 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?

Parents
  • 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
Reply
  • 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
Children
No Data

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