The ability to properly measure ground resistance is essential in preventing costly downtime due to service interruptions caused by poor grounds. Over time, corrosive soils with high moisture and salt content and high temperatures can degrade ground rods and their connections. So, although the ground system had low earth ground resistance values when initially installed, the resistance of the grounding system can increase if the ground rods are corroded.
Grounding testers are indispensable troubleshooting tools to help you maintain uptime. It is recommended that all grounds and ground connections be checked at least annually as a part of your normal predictive maintenance plan.
Here are the most commonly used ground resistance testing methods:
The three-pointground resistance testing method is the most thorough and reliable test method; used for measuring resistance to earth of an installed grounding electrode.
The four-point method is the most commonly used formeasuring soil resistivity, which is important for designing electrical grounding systems.
The clamp on method is unique in that it offers the ability to measure resistance without disconnecting the ground system. It is quick, easy, and also includes the bond to ground and overallgrounding connection resistancesin its measurement.
Our family of earth ground testers have been built to address the entire spectrum of ground testing methods from the basic to the most advanced.