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Electricity question

  1. Jul 26, 2012 #1
    Modern high voltage electrical transmission lines (400kV) may be constructed with cable having a core of twisted steel strands surrounded by layers of twisted aluminium strands?

    What advantage is gained by using strands of steel rather than a single wire of equivalent total cross section?
  2. jcsd
  3. Jul 26, 2012 #2
    Stranded cables are more flexible than solid.

    How would you wind a solid cable of that thickness on and off a drum?
  4. Jul 27, 2012 #3


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    Steel for its strength, Aluminium for it's conductivity.

    Stranded steel less prone to fracture as well as easier to handle.
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