What is the purpose of measuring ground resistance?

Measuring ground resistance is crucial for ensuring electrical safety in various environments where electrical systems and lightning protection systems are installed. A low ground resistance value indicates that the grounding system is effective in dissipating electrical currents safely into the earth, reducing the risk of electrical shock and equipment damage. This is particularly important in preventing hazardous conditions during lightning strikes or electrical faults, as a poor grounding system can lead to high voltage build-up, posing a severe risk to people and equipment.

In the context of the other options, assessing structural integrity relates to the physical condition of buildings or structures, which is not directly linked to electrical grounding measurements. Evaluating material strength pertains to the strength characteristics of construction materials, while testing insulation capacity focuses on the effectiveness of an insulating material to prevent unwanted current flow. While these factors are important in their own right, they do not directly relate to the primary purpose of measuring ground resistance, which is fundamentally about ensuring safety and preventing electrical hazards.