The aim of earthing in electrical installations and circuits is to enhance the safety of the installation by reducing the level of danger inherent to fault currents. Fault currents may be caused by different factors. Therefore, it is very important to design an earthing system according to the installation’s characteristics.
An effective earthing system is critical to the safety of every electrical installation. The introduction of new international standards together with increased awareness within the electricity industry require developers and operators of these installations to carry out more thorough assessments and design studies to demonstrate safety compliance.
This is increasingly challenging against a backdrop of higher fault levels, smaller-area substations and the more prevalent use of sensitive electronic equipment, both at the substation and by external third parties, where the impact of transferred earth potentials may need to be mitigated.