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Consider the following properties regarding insulation for cables: 1. A low specific resistance 2. High temperature withstand 3. High dielectric strength Which of the above properties of insulation are correct while using cables?

Consider the following properties regarding insulation for cables: 1. A low specific resistance 2. High temperature withstand 3. High dielectric strength Which of the above properties of insulation are correct while using cables? Correct Answer 2 and 3 only

The satisfactory operation of a cable depends to a great extent upon the characteristics of insulation used. In general, the insulating materials used in cables should have the following properties.

  • High insulation resistance to avoid leakage current i.e. high specific resistance
  • High dielectric strength to avoid electrical breakdown of the cable
  • High temperature withsatnd
  • High mechanical strength to withstand the mechanical handling of cables
  • Non-hygroscopic i.e., it should not absorb moisture from air or soil; The moisture tends to decrease the insulation resistance and hastens the breakdown of the cable. In case the insulating material is hygroscopic, it must be enclosed in a waterproof covering like a lead sheath
  • Non-Inflammable
  • Low cost so as to make the underground system a viable proposition
  • Unaffected by acids and alkalies to avoid any chemical action

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