In case of electrical installations, if cable conductors are spiralling, then the resistance/unit length will _______.

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  1. decrease
  2. remain the same
  3. become zero
  4. increase

Answer (Detailed Solution Below)

Option 4 : increase
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Spiraling of conductor

  • The overhead transmission line needs a conductor which is light in weight and also has greater conductivity. For this spiraling of the conductor is done.
  • It is a process in which the core is of the material which has greater conductivity while the outer strands are of lighter material.
  • ACSR (aluminum-conductor-steel-reinforced) is one of the most used conductors in transmission lines.
  • It consists of alternate layers of stranded conductors, spiraled in opposite directions to hold the strands together, surrounding a core of steel strands.
  • The purpose of introducing a steel core inside the stranded aluminum conductors is to obtain a high strength-to-weight ratio.
  • A stranded conductor offers more flexibility and is easier to manufacture than a solid large conductor.
  • So, the spiraling effect typically leads to a higher resistance per unit length due to the increased effective path length.

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