Question
Download Solution PDFWhich of the following methods cannot be used to reduce earth’s resistance?
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFThe resistance of earth is the resistance between infinite earth and earth electrode. It is depending on the condition of the soil, moisture content, dissolved salts and temperature of the soil.
There are several ways we can improve earth electrode resistance:
- By pouring water in the earth pit at repeated intervals
- By increasing the plate area
- By using longer rod deeper into the earth
- By using multiple rods
- To reduce soil resistivity, it is necessary to dissolve in the moisture particle in the soil; Some substance like salt/charcoal is highly conductive in water solution.
Important Point:
Methods of earth resistance measurement:
- 2-point dead earth method
- 3-point or fall of potential method
- 4-point method
- Clamp-on method
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