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A new improved scale model to study the behaviour of grounding systems in non-uniform (two layer) soils has been developed. Constructional details and instrumentation has been discussed. To verify the accuracy of the results obtained from the tests conducted on the model, they have been compared with the data available in the literature. The results giving the potential profile, grounding resistance, mesh and step potentials for a number of grids in two layer soils are presented.
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Thapar et al. (1987) studied this question.
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