Services for Earth Ground Testing
• Four methods: stakeless, selective, soil resistivity, and fall-of-potential.
• Stakeless testing uses only two clamps, eliminating the need for temporary ground stakes.
• Selective testing isolates the system for system checks.
• Soil resistivity testing uses four stakes before earthing arrangement installation.
• Fall-of-potential testing uses two stakes and the electrode to prove correct system installation.
• Ground testing requirements include achieving the lowest ground resistance economically and physically.
• Fall-of-Potential test measures energy dissipation of an earth ground system or individual electrode.
• Resistance calculation using Ohm's Law.
• Significant changes in reading require increased distance between ground rod and stake.