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发布日期:2021年04月14日
Adding induction hob
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Discussion in 'Electricians' Talk' started by Alvin12, Jan 1, 2021 at 8:56 PM.

  1. Alvin12

    Alvin12 New Member

    Hi,
    I'm planning to swap the gas hob which has packed up with an induction one. Currently I have an electric oven fed by a 30A radial spur with either 4mm or 6mm cable. I cannot find an isolation switch between the cu and the oven. There is no insulation around any cabling.

    Can I add a 7.2kw induction hood to this feed or will I need to run a new spur to it's own fuse.
    Thanks?
    Alvin
     
  2. terrymac

    terrymac Screwfix Select

    I assume you mean a radial circuit ( not spur) and it is protected by a 3O amp fuse.
    If the circuit doesn't have any other appliance connected ,besides your oven, then the 7.2 kilowatt HOB can be connected to the circuit.
    What is the kilowatt rating of your oven ? I expect it is less than 4 kilowatt.
    A dual appliance outlet plate would be the easiest way to connect both appliances.
    How is your current oven connected to the circuit cable ?
     
    Bazza likes this.
  3. Alvin12
    人间中毒迅雷下载 人间中毒迅雷下载 ,罗马风情qvod 罗马风情qvod ,动漫种子 动漫种子

    Alvin12 New Member

    Thanks for the reply Terrymac, sorry it is a radial circuit as it goes directly to the cu. The oven is rated at 4800 W with a recommended fuse rating if 20A.
     
  4. Alvin12

    Alvin12 New Member

    Just checked it looks like the current connection is directly to the oven. I will add a 45A switch to isolate both
     
    terrymac likes this.
  5. terrymac

    terrymac Screwfix Select

    Ok to still run both oven and hob.
     
  6. Alvin12

    Alvin12 New Member

    Thanks. Can you tell me how it works out please? It looks like the maximum load could be 4800w+7200w so 12 KW.
     
  7. Alvin12

    Alvin12 New Member

    I was thinking current would be peaking at around 55A
     
  8. seneca

    seneca Screwfix Select

    Allowing for diversity a 32 amp mcb on 6mm cable is good for up to 15kW.
     
  9. terrymac

    terrymac Screwfix Select

    12000 watts ÷ 230 v nominal voltage =52 amp. Applying diversity calcs. Take the first 10 amps plus 30% of the remainder.
    42X30%= 12.6 amps + 1O amps
    Equals 22.6 Amps. If there is a socket outlet on the circuit ,one would add a further 5 amps ,but you haven't got a socket.
    So 22.6 amps ( bit less if your actual voltage is 240 v.)
    As every single heating element is not drawing current at the same time ( or if they do it's minimally) but cycle on and off by their thermostats .
    So your 30 amp circuit is well within its limits. 人间中毒迅雷下载 人间中毒迅雷下载 ,罗马风情qvod 罗马风情qvod ,动漫种子 动漫种子
     
  10. Alvin12

    Alvin12 New Member

    Hi Terrymac, thanks for the explanation that makes sense. Will have a look for an induction hob then at 7.2kw or less. Does the unit need to state it works with diversity levels?
    Thanks all or the advice as well.
     
  11. terrymac

    terrymac Screwfix Select

    No . Most retailers descriptions ,specifications etc are written badly ,are confusing and no doubt written by clueless office workers who have never fitted a hob never mind having any electrical knowledge or experience. And probably think Diversity is a cool group of young dancers led by Ashley Banjo.
     
  12. Alvin12

    Alvin12 New Member

    Thats the best description I've heard in ages for those who write the documents.
    If the hib was rated at 7.4 kw which I can get tomorrow. I think there is still enough overhead. I will need to measure the cable diameters as well to be sure.
     
  13. Alvin12

    Alvin12 New Member

    It looks like getting hold of a 45A dual outlet is going to be tricky. Would a 2 gang cooker switch do the same? Sorry if that's a daft question.
     
  14. terrymac

    terrymac Screwfix Select

    How so, they are widely available ???
     
  15. Alvin12

    Alvin12 New Member

    They are not in screwfix or tool station as far as I can see and all local wholesalers are shut or out of stock.
     
  16. terrymac

    terrymac Screwfix Select

    If you can't wait until Monday ,use a 60 amp junction box ,until you can do it properly.
    Tool station code 98775.
     
  17. Alvin12

    Alvin12 New Member

    Thanks for the advice I'll probably wait till monday it's better it be done right. Does mean a couple of days of takeaways though. Theres always a silver lining.
     

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