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  1. Soulsurfer
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    Soulsurfer Electrician's Arms

    Location:
    Channel Islands
    Hi all,
    Just looking into a kitchen refit where the customer has gone a bit excitable with the cooking side of things !

    Have done lots of installs with two appliances on the one circuit but anyone know of any issue with feeding three rather than run a new circuit for say the new hob alone ?

    I have an existing 32A rcbo on a 6mm twin for built in oven now and hob but new kit is an oven at 3.45kW
    Combi oven / micro at 3.6kW

    and finally an induction hob at 5.6kW
    24.3A fuse rating on spec sheet so they haven't allowed any diversity.
    Anyone fitted them with a diversity applied ? as I haven't fitted any induction before.

    I'm making it a shade under 27A for the oven and combi together,

    and if allowed on induction 18.7A approximately but I'm thinking likely run a new circuit from cu at the full load rating the manufacturer of the hob has given.
     
  2. Wilko
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    Wilko Midwest is King Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    Looking at OSG Appendix A and noting coffee not kicked in yet so hopefully I've understood correctly ...
    10+13.5+5(say)=28.5A for domestic and
    24.3+12.5+9=45.8A for small shop.
    Translation : if the customer likely to go nuts with new kit (ask them?) try to sell them on the idea of a new supply :)
     
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  3. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    When I've calculated diversity for domestic ovens, I've applied diversity to each appliance individually, not the total load added together.

    I'm not sure if that is the right interpretation, but my thinking is the end user can operate each appliance as they choose to, as opposed a singular appliance preventing them from using all heating elements, if you get my drift. Like a single oven, where you can't use the grill & main oven simultaneously.
     
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  4. Richard Burns
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    Richard Burns Trusted Advisor

    Location:
    Cambridgeshire
    Business Name:
    Richard Burns
    It would probably be OK on the standard arrangement (subject to Wilko's caveats) but if you have the option to run a new supply for the hob then this means you are very safely covered.
    The customer will need to be informed that they are using a lot of power and be sensible!
    If you turn everything on and then jump in your 10.5kW electric shower you could get the main 60A fuse to go!
     
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  5. Murdoch
    Online

    Murdoch Electrician's Arms

    Location:
    Woking
    2 appliances - OK, adding a 3rd may push it............ I would probably recommend a 2nd supply OR changing the induction hob for one with a 13A plug!
     
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  6. Wilko
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    Wilko Midwest is King Electrician's Arms

    Location:
    Berkshire
    Business Name:
    Wilko Electrics
    It would be interesting to compare the two methods, hopefully it would have the same outcome :)
     
  7. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    looking at that loading you have given .I makes more sense.reg 433.1.103 (111)connecting cookers hobs
    exceeding 2kw on own dedicated r/circuit.
    how many times we have been around the houses with hobs &cookers on this forum!
     
  8. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    I forgot soulsurfer in channel islands .by the time the bong drums start banging. he would be able to hear it!
     
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  9. hightower
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    hightower Trainee Electrician's Arms

    Location:
    Durham
    My understanding is, using a dedicated radial circuit means not connecting it among other appliances such as on the RFC etc. It doesn't mean a radial for each appliance over 2kW.

    You can have a dedicated radial for all three appliances, just so long as that circuit meets design requirements. It's still a dedicated circuit for those appliances.
     
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  10. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    when I do installs cookers hobs ,on the own dedicated circuit. but that's for me only.
    with this day and age you will never know .
     
  11. Phil Thompson
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    Phil Thompson Let us light up your life! Electrician's Arms

    Location:
    Newtownards
    Business Name:
    Brite Spark Electrical
    After being caught out a few times by being given incorrect (smaller) kw ratings of induction hobs, I now just pull in a seperate feed for them than the oven when I hear induction hob mentioned.

    Last time was given a similar rating to the OP, however on day of fitting it was actually 7.8Kw.

    I see more and more folks on my Facebook feed doing batch cooking at weekends due to work commitments during the week. So they are using all rings and ovens to be doing as much as they are doing, no longer just a Christmas dinner thing anymore for some households to be using full ratings of cooking appliances as it used to be.
     
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  12. Midwest
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    Midwest Electrician's Arms

    Location:
    Oxfordshire
    Don't think your following what I'm suggesting Wiko.

    For the three appliances of 3450w, 3600w & 5600w, using Table A1 (applying diversity separately) I get a figure of 37.5amps (no sockets).

    Or have I got my maths wrong?
     
  13. telectrix
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    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Location:
    cheshire/staffordshire
    Business Name:
    Telectrix
    all 3 in use are never going to pull >45A, so a single 45A isolator, fed 6mm on a 40A breaker if method C. 10mm cable id insulation correction required.
     
  14. Soulsurfer
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    Soulsurfer Electrician's Arms

    Location:
    Channel Islands
    What's the bong drums dare I ask !
     
  15. buzzlightyear
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    buzzlightyear Electrician's Arms

    Location:
    star command
    [​IMG] their you go soul train!
     
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    Last edited: Aug 10, 2017 at 4:58 PM
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