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Safe cable size for 3kw immersion heater.

Discussion in 'Electrics UK' started by Andystu, 5 Nov 2008.

  1. Andystu

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    Hi, all. A friend of mine has just had a new boiler and cntral heating system to replace his original one. For some reason, the old immersion heater was connected to 1.5mmT&E. The electrician that came to wire up the new system including the new immersion heater, said that the 1.5mm T&E cable was ok to leave in and wire up to.!. Is this the case or was he just being lazy not wanting to rewire with 2.5mm T&E. The cable is on its own circuit and the length is aprox 25metres. Also, I was wondering if the fuse fitted is ok at 16amps, i'm just a little concerned that the safety device i.e the circuit breaker can stand more than the cable?
    Any advice would be appreciated.
    Andy Stu
     
  2. plugwash

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    how is the cable run? In particular does it run through any insulation?
     
  3. Andystu

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    I believe it runs from the consumer unit which is located in the single storey garage, up through the garage lof space which has a small amount of insulation, maybe 50mm then under the floor boards and into the airing cupboard. If the route is vital for the calculation then I can find out exactly in more detail.

    Thanks,

    Andy Stu
     
  4. Softus

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    The route isn't vital - 1.5mm² T&E can safely carry more than 13A even if insulated and in conduit.

    A 16A breaker is also fine, but the outlet in the airing cupboard should be fused at 13A.
     

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