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B How does the current carrying capacity depends on thickness

  1. Mar 12, 2016 #1
    How does the current carrying capacity depends on the thickness of insulation of conductor ?
     
  2. jcsd
  3. Mar 12, 2016 #2

    davenn

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    What physical thing happens to a wire carrying current ?

    When you insulate that current carrying wire, what then happens to the wire ?

    and if the insulation is even thicker ?

    As a side hint ... think about why insulation is put around a hot water pipe in parts of countries with cold climates ..... what does that insulation achieve ?


    Dave
     
  4. Mar 13, 2016 #3

    davenn

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    so what are your thoughts ?
    can you think of some answers to those Q's


    Dave
     
  5. Mar 13, 2016 #4
    First of all Thanks for those questions which are in turn helping me to ponder about the answer of my question..

    My views on your questions asked are as -

    1. Physical thing - Heating effect is produced in wire carrying current due to resistance..
    2.When we insulate the wire, wire gets protected from outside temperature and heat generated inside the wire gets dissipated through insulation ( if insulation thickness is equal or less than critical radius.)
    3. If insulation thickness is increases beyond the critical thickness than heat transfer decreases to surrounding.
    4. In cold countries hot water pipes are insulated to prevent the loss of heat from water to outside where temperature is low and thus reducing the heat loss.
     
  6. Mar 13, 2016 #5

    davenn

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    Yes
    no, you are looking at it the wrong way around ... if the wire has insulation on it, the heat cant escape as easily

    yes, but for any thickness

    yes, so you see how that is bad for a wire carrying current
    the overall effect is ... The insulation will cause the wire to heat up more, and as the temperature of the wire increases,
    it's ability to carry current decreases. All very significant in circumstances where high current is a factor

    you might find this an interesting read ....
    http://www.ieee802.org/3/poep_study/public/sep05/walling_2_0905.pdf

    cheers
    Dave
     
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