Measuring Earthing Value/ How to lower the Ground resistance
The Most effective way of lowering earthing resistance is to drive earthing electrodes deeper. Soil is not consistent in its resistivity and can be highly unpredictable.
It is critical when installing the earthing electrode that it is below the frost line. This is done so that the resistance to ground will not be greatly influenced by the freezing of the surrounding soil. Generally, by doubling the length of the ground electrode you can reduce the resistance level by an additional 40%.
There are occasions where it is physically impossible to drive ground rods deeper-areas that are composed of rock, granite, etc. In these instances, alternative methods including grounding cement are viable.
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