Earthing Systems - Basic Constructional Aspects

       

Further reading

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• Earthing Systems - Fundamentals of Calculation and Design (47790)

This Application Note discusses practical design of earthing electrodes, including the calculation of earthing resistance for various electrode configurations, the materials used for electrodes and their corrosion performance.  Equations are given for many common electrode geometries, including horizontal strips, rods, meshes, cable screens and foundations. 

Despite the fact that these formulae are derived under the false assumption that soil is boundless and homogenous and ignore the fact that the ground resistivity changes with moisture content, the values obtained, although approximate, are useful in predicting and optimising performance.