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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?

  • 0
    well it may be a cut and shut from the instructions from another model they make or they are worried about heating of the terminals. ..


    normally from a current rating point of view Id have thought for a 2kW2 oven 1.5mm would normally  just about do, and 2.5mm be the 'conservative' option. 4mm is overdoing it - indeed on the last one I did, I reckon 4mm would not even fit.

    M.
  • 0
    RCW:

     ... but the oven manual states that it must be hard wired to a Circuit with 13a protection ...


    Which means, I think, that an FCU is the only way of doing it; which suggests that the manufacturer really doesn't understand British domestic installations.


    Even worse, the load terminals of a BS 1363 FCU need only accommodate 1 x 2.5 mm² conductors.


  • 0
    RCW:
    Denis McMahon:

    I agree with others in that there is not a safety issue. However it is a rather untidy arrangement, and not within the spirit of the Wiring Regulations, let alone the letter.


    I am not keen on hard wiring appliances to the permanent mains wiring. If two spur points were provided, then it would be easy to remove either the oven or the hob for servicing. Even consider two 13 A sockets that the appliances would plug into. Quicker and easier still to remove for servicing.


    I totally agree with the idea of 13a sockets, but the oven manual states that it must be hard wired to a Circuit with 13a protection, And wired with a minimum 4.0mm three core cable or T&E


    The oven is rated at 2200W, why would they consider 4.0mm as the minimum, surely 1.5mm would be acceptable?

     







    Hi, that's strange, asking for a 4mm T&E. Ask their people how they come to this 4mm T&E... even if you used a 2.5mm T&E would suffice... especially over a very short distance!


  • 0
    Nowhere near as bad as the cooker I found today, wired from the connector unit in 1.5mm T+E.

    A 9.8kW cooker.

    And, it had shorted out when cooking christmas dinner.

    It appears there was a loose connection on the outgoing neutral at the metal connector unit, this had melted the insulation, and caused a short to the earthed body. Causing a bang and flash. I can't be certain if it was a loose connection, or overheating of the undersized cable that melted the insulation.

    The Owner had no idea about cable size, and just said 'thats what was on it when it came'.
  • 0
    If manufacturers state electrical requirements that you know are wrong, you may deduce that the manufacturers obviously do not know about such things and are quite simply - wrong.


    Instead of thinking that such manufacturers might be correct, for some reason, it would probably be better to expect that they are also wrong on other matters.
  • 0
    geoffsd:

    If manufacturers state electrical requirements that you know are wrong, you may deduce that the manufacturers obviously do not know about such things and are quite simply - wrong.


    Instead of thinking that such manufacturers might be correct, for some reason, it would probably be better to expect that they are also wrong on other matters.


    134.1.1 The installation of electrical equipment shall take account of manufacturers' instructions.


    Thank God that's all we have to do!


  • 0
    Definition of "hard wired with 13 A protection"? This could cover a multitude of sins, including the present set-up and a 13 A fused spur unit. My interpretation of this would be, "Don't use plug and socket connection."


    As for the connection, my choice would be 2·5 mm² heat resisting flexible cord for something like this.
  • 0
    I will now set the cat amongst the pigeons.


    You are doing an EICR, is anyone going to code any of the suggestions above?

    Let's see...
  • 0
    geoffsd:

    If manufacturers state electrical requirements that you know are wrong, you may deduce that the manufacturers obviously do not know about such things and are quite simply - wrong.


    Instead of thinking that such manufacturers might be correct, for some reason, it would probably be better to expect that they are also wrong on other matters.




    By requiring the installer to use a 4mm2 cable I think that they are just covering themselves... personally I'd prefer to use some bell wire! ?


  • 0
    To me the 4mm sounds like cut and paste from the instruction book from a larger model, and not a lot of thought at the level of the supposedly technical author.  i.e. just plain wrong. 

    The clincher will be to inspect the terminals on the oven, that probably can only take 2,5mm or smaller anyway.

    It is not that uncommon to see instructions translated from the foreign or indeed universal instructions for more than one product, with this sort of thing in.

    By all means take account of the instructions, but it may be that the authors actions are to be  weighed in the balances and found wanting,  as it were.

    To misquote a book telling us how to behave, that pre-dates BS7671 by quite a bit.

    Mike.


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