The minimum clearance of the High Voltage (HV) line from the ground across the road should be

Question

The minimum clearance of the High Voltage (HV) line from the ground across the road should be

1. A. 6.1 m (Correct answer)
2. B. 5.1 m
3. C. 3.1 m
4. D. 8.1 m

Correct Answer

Option A — 6.1 m

Detailed Solution & Explanation

The correct answer is 6.1 m.

Key Points

• The minimum ground clearance for a High Voltage (HV) line crossing a road is 6.1 metres, as laid down in the Indian Electricity Rules.
• The larger clearance over roadways allows tall vehicles to pass safely beneath the conductors.
• Clearances are always greater across roads than along open country, and greater for high voltage than for low voltage.

Additional Information

• Related clearances worth memorising:
  • Low voltage lines across a road: 5.8 m
  • Low voltage lines along a street: 5.5 m
  • HV lines along a street: 5.8 m
• These figures are measured to the lowest conductor at maximum sag, which occurs at the highest conductor temperature.