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Earth resistance does not depend on ______.
1. Operating time
2. Depth of Earth Electrode
3. Moisture
4. Temperature

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Correct Answer - Option 1 : Operating time

Concept:

The resistance of earth is the resistance between the earth and earth electrode. It depends on three factors.

  • The resistance of earth electrode
  • The contact resistance between electrode surface and soil
  • The resistivity of soil between the electrode and earth


The resistivity of soil depends upon

  • The electrical conductivity offered by a soil mainly due to electrolysis i.e. the resistivity of a soil is mainly electrolytic in nature
  • So, concentration of water, salt (NaCl) and other chemical components in the soil largely determines its resistivity
  • The chemical composition of the soil
  • The temperature of the soil
  • Moisture; moist soil is best suited for earthing purpose
  • It is normal practice to insert an earth electrode well below the ground level, to get a stable moist soil in depth

 

Explanation:

Earth resistance depends on the depth of the earth electrode, moisture, temperature but it does not depend on operating time.

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