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Question about copper conductor size.

Discussion in 'Electrical Engineering' started by Peter Jason, May 8, 2006.

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  1. Peter Jason

    Peter Jason Guest

    I have a large electric oven rated at 15KW
    resistive load, plus another 3KW for 3-phase
    induction motors.

    Say 18KW total continuous running.

    All this has to be connected to a 3-phase
    supply in delta.

    How can I determine the conductor size for
    each of the 3-phase connections in Amps?

    Please help, Peter.
  2. Peter Jason

    Peter Jason Guest


    PS the 3-phase is 415V
  3. Peter Jason

    Peter Jason Guest

    "TimPerry" <>
    wrote in message
    Many thanks; The electrician left out the
    SqRt3=1.732 in the denominator.

    I get Amps = 18000/(1.732 x 415) = 25amps /

  4. Guest

    I get 8ga copper. 31.3a
    (using the 1.73 factor to account for 3p, and 125% of computed load)
  5. Peter Jason

    Peter Jason Guest

    It runs continuously and unattended during
    the off-peak tariff times at night.

    It is used for the melting the contents of 4
    x 200L (55usg) drums on standard pallets.

    It has forced-air circulation directing hot
    air to the underside of each drum via air
    injectors, by means of a hot-air blower.

    It operates at up to 110degC.
  6. Guest

    You are looking at MI cable now. How is your wallet ;-)
    6ga MI will be plenty, you still might be able to get away with 8 but
    it is shaky
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