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Question

The material for armouring on cable is usually

The correct answer is
Both galvanised steel wire and steel tape

Cable Armouring Materials Explained

Cable armouring provides essential mechanical protection against damage. This protection is crucial in environments where cables might be subjected to crushing, impact, or rodent attack.

Common Armouring Materials

  • Galvanised Steel Wire: Often used in a SWA (Steel Wire Armour) construction, these wires are applied helically around the inner core. The galvanisation prevents corrosion.
  • Steel Tape: Armouring can also be constructed using steel tapes, typically applied helically in one or two layers over the core or bedding.

Conclusion on Armouring

Both galvanised steel wire and steel tape are widely employed as materials for cable armouring, offering different forms of mechanical protection depending on the specific application and required level of defence.

Therefore, the most accurate description encompasses both materials.

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Important Questions from Underground Cables

  1. Which of the following is a leading power factor system?

  2. Which of the following is NOT a disadvantage of the direct laying method?

  3. Grading of the cables is performed in order to achieve _________

    (i) uniform stress

    (ii) reduction in the quantity of insulation

    (iii) reduction in quality of insulation

  4. What is the minimum resistance required in insulation test voltage is 500 V DC accordance with BS 7671?
  5. Murray, Varley and Fisher loop tests are used for

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