Which safety factor is most important when designing transmission lines under ice and wind conditions?

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RRB JE EE 22 Apr 2025 Shift 2 CBT 2 Official Paper
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  1. Thermal expansion factor
  2. Electrical safety factor
  3. Mechanical stress factor
  4. Magnetic field factor

Answer (Detailed Solution Below)

Option 3 : Mechanical stress factor
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The correct answer is option 3.

Factors while designing transmission lines

When designing transmission lines under ice and wind conditions, the most important safety consideration is the mechanical stress placed on the conductors and support structures due to:

  • Ice loading: Adds extra weight to the conductors, increasing tension and sag.
  • Wind pressure: Exerts lateral forces that can sway or damage the lines and towers.


These conditions can lead to mechanical failure (e.g., snapped conductors or collapsed towers) if not properly accounted for. Factors such as height, spacing, and material selection must be carefully considered to withstand environmental conditions, dynamic loads, and ensure longevity. Foundations must be designed to provide stability and minimize environmental impact.

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