To ensure the electrical system functions properly, it’s important to have low impedance in buried grounding system. When designing and installing electrical power systems, proper grounding is not just a luxury, but a necessity. All good grounding systems should provide a low impedance path for fault and lightning-induced currents to enter the earth. More specifically, a properly installed grounding system not only helps safeguard buildings and equipment, but also protects human beings too. Though the overall effectiveness of a buried grounding system depends on many factors, the soil resistivity is the single most critical factor in electrical grounding design. Good soil models are the basis of all grounding designs and they are developed from accurate soil resistivity testing.