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Earth Resistivity Tests

19 – 23 May 2025Abu Dhabi20 – 24 Oct. 2025Dubai15 – 19 Dec. 2025Abu Dhabi


Learning Objectives

Upon successful completion of this course, participants will be able to:

1. Fundamentals of Earth Resistivity and Grounding

  • Understand the importance of earth resistivity in grounding systems.
  • Learn how soil composition, moisture content, and temperature affect resistivity.
  • Differentiate between ground resistance vs. ground resistivity.
  • Understand applications of low-resistance grounding for electrical safety.

2. Earth Resistivity Measurement Methods

  • Identify the different test methods for measuring soil resistivity:
    • Wenner Four-Pin Method (ASTM G57 standard).
    • Schlumberger Method for deeper soil analysis.
    • Fall-of-Potential Method for ground resistance measurement.
    • Clamp-on Ground Resistance Test for existing systems.
  • Select the appropriate testing method based on site conditions.

3. Test Equipment and Instrumentation

  • Learn how to operate earth resistance testers and megohmmeters.
  • Use digital ground testers and clamp meters for non-intrusive testing.
  • Follow calibration and verification procedures for accurate readings.

4. Performing Earth Resistivity Tests in the Field

  • Follow a step-by-step guide for soil resistivity testing.
  • Set up electrode spacing and depth based on project requirements.
  • Identify common errors in testing and how to avoid them.
  • Record and interpret soil resistivity values for grounding system design.

5. Grounding System Design Based on Soil Resistivity

  • Use resistivity test results to design effective grounding electrodes.
  • Determine the number and depth of ground rods needed for low resistance.
  • Apply chemical grounding and soil treatment techniques for high-resistivity areas.

6. Interpretation of Test Results and Compliance Standards

  • Analyze test data trends for different soil layers.
  • Compare results with IEEE 80, NEC, IEC 60364, and NFPA 70 standards.
  • Ensure compliance with utility and industrial grounding requirements.

7. Troubleshooting and Improving Grounding Performance

  • Diagnose high-resistance grounding issues.
  • Implement techniques to reduce ground resistance (e.g., grounding grids, conductive backfill).
  • Perform periodic ground resistance testing for system maintenance.

8. Case Studies and Practical Applications

  • Analyze real-world grounding system failures and solutions.
  • Participate in hands-on exercises for soil resistivity measurement.
  • Develop a grounding improvement plan based on test results.

 

Target Audience

  • Electrical engineers and safety professionals
  • Power plant and substation engineers
  • Industrial and commercial facility managers
  • Grounding system designers
  • Utility and electrical maintenance personnel