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Hot Water Tank & Central Heating Therm- Cable Requiremen

Discussion in 'Electrics UK' started by jonwestuk, 18 Feb 2014.

  1. jonwestuk

    jonwestuk

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    Hi All,

    I need to purchase the cabling and make the runs ready for my electrician to wire in a new central heating thermostat and hot water tank thermostat + immersion heaters. Could anyone advise me on the what cable is usually used for such purposes?

    I would imagine:
    - Gas Central heating Thermostat - 3 core + earth 1.5mm (I presume there is not really that much current going through it.
    - Hot Water Tank Thermostat to Central Heating - 3 core + earth 1.5mm
    - 3kw @240v Electric Immersion Heater as backup for hot water tank - 2 core + earth 2.5mm

    Are any of my assumptions incorrect here?

    Thanks,

    Jon
     
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  3. jonwestuk

    jonwestuk

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    Oh and I realise that I need heat resistant Flex from the wall switch to the immersion heater.
     
  4. ricicle

    ricicle

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    Why don't you ask the electrician as he will be putting his name to the job ?
     
  5. jonwestuk

    jonwestuk

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    Mainly because I have already asked him a million questions and I am feeling a bit guilty as a result, but maybe this is a query deserving of another call...
     
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  7. AndyPRK

    AndyPRK

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    your selections sound fine.

    could even use 1mm for the thermostats.
     
  8. EFLImpudence

    EFLImpudence

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    I would go further and wonder why 1.5mm² is even considered (it seems to have become fashionable (i.e. no valid reason)).

    The maximum current carrying capacities:
    1mm² - 16A
    1.5mm² - 20A
    2.5mm² - 27A

    Demand:
    Central heating - maximum half an Amp.
    Immersion heater - 13A
     
  9. jonwestuk

    jonwestuk

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    Point noted - I have bought loads of 1.5mm and 2.5mm ready for when my Sparky arrives on Monday. Not sure there is any point in buying additional 1mm when I am sure to have some left over.
     
  10. EFLImpudence

    EFLImpudence

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    Just a waste of copper which also seems to have become fashionable.
     
  11. DIYnot Local

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