Welcome to Star Power Expertise. This is my first post about grounding systems
Grounding System Design and Planning starts with a site analysis, collection of geographic data, and soil resistance of the area. Generally, the site engineer or equipment manufacturers specify a resistance to ground number. The National Electric Code states that the resistance to ground shall not exceed 25 ohms for a single electrode. However, great technology manufacturers will often state 3 or 5 ohms, depending upon the requirements of their equipment. For sensitive equipment and under extreme circumstances, a one ohm specification may sometimes be needed. When designing a ground system, the risk and cost increase exponentially as the target resistance to ground approaches the unobtainable goal of zero ohms.
Grounding System Data Collection
Once a need established, data collection begins. Soil resistivity testing, geographical analysis and test borings would support grounding design. Soil resistivity test using the Wenner 4-point method suggested due to its accuracy. This method will discuss later in this chapter. Additional data always helpful and can collect from existing ground systems placed at the site. For example, driven rods at the place can test using the 3-point fall-of-potential method or an induced frequency test using a clamp-on ground resistance meter.
Grounding System Data Analysis
With all available data, smooth computer programs begin to give a soil model exhibiting the soil resistivity in ohm-meters and at various layer depths. Knowing at what depth the most conductive soil located for the site would allow the design engineer to design a system to meet essentials of application.
Grounding System Design
«Soil resistivity is the important factor that regulates the resistance or execution of an electrical grounding system. It is the starting point of any electrical grounding design.»
https://carelabz.com/what-how-grounding-design-planning/https://carelabz.com/what-how-grounding-design-planning/
