When designing the grounding system, we must consider the soil conditions to make the best choice. The design of the grounding system is based on the accurate measurement of soil in order to understand the resistance coefficient of soil in different strata. With this data, we can decide which grounding system is the best from the technical and economic point of view. One of the important points is that the distance between vertical rods should be at least equal to the length L of the rod installed, but not more than 10 meters. With the above conditions, we can ensure that the grounding rod we choose will be effective for many years.
Soil resistivity directly affects the installation of the grounding system. According to different soil components, the resistivity range varies greatly. We should avoid dry, Sandy and rocky soils as much as possible.
Increasing soil moisture can rapidly reduce resistivity. In areas where rainfall varies greatly, it is very important to consider soil moisture. Therefore, the grounding rod should be installed under the groundwater level line or permanent groundwater level as far as possible. Temperature-soil temperature also has a great influence on resistivity.
The corrosion resistance of grounding material should be taken into account when selecting grounding material. We must ensure that the grounding resistance does not increase with the passage of time and the degree of corrosion. Copper clad steel earth rod
has been widely used in grounding devices because of its good electrical conductivity, high mechanical strength, especially the excellent corrosion resistance of the copper coating coated on the outside.