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  • Electrickery – cable for 3kW max
  • sharkbait
    Free Member

    I need to replace a short piece of cable [literally less than 2 x 20cm sections] that carry a maximum of 3kW (Immersion).

    I have some spare 1mm twin and earth hanging around – the internets says that’s fine but I thought I’d ask on here* too.

    * Fully expect to be told that I should have the whole house rewired, shouldn’t drive a big diesel, that my lawn needs cutting and it’s all the government’s fault.

    SSS
    Free Member

    Without going to look at my copy of the BS7671…….

    Yes, you are correct – ‘clipped direct’ the current carrying capacity exceeds your requirement of 12.5A (3kW @240v)

    Source https://intrelec.co.uk/2020/10/21/cable-sizing-charts/

    Its very short so volt drop shouldnt be an issue.

    BUT! The cable will have been calculated on fault current/ protective device rating etc

    So would i use it?

    No.

    Id be looking at 2.5mm probably for an immersion (i think the regs say 1.5mm minimum)

    temudgin
    Full Member

    The cable connecting to the immersion should be heat resisting- butyl flex would be ideal.

    sharkbait
    Free Member

    The cable connecting to the immersion should be heat resisting- butyl flex would be ideal.

    It’s actually going near the CU in another room so heat is not an issue.

    Id be looking at 2.5mm probably for an immersion (i think the regs say 1.5mm minimum)

    Ahh, fair enough. I do actually have a roll of 2.5mm but it’s just a PITA to deal with as it’s ‘so’ stiff! I was hoping to get away with something more flexible – not to worry, 2.5mm it is!

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