Protective earthing includes measures for safeguarding the metal components that do not belong to the circuits, nor are they in precise electrical contact with them, but in case of defeat, a voltage could arise. Earthing reduces the voltage and prevents the development of situations that are hazardous to equipment, as well as people who handle the equipment.
According to the material from which they made; we characterize the following types of earthing. These include tubes or roads, strips or vines, plates, reinforcement in concrete or metal water supply pipes. Grounding includes procedures for protecting the part of the circuit, which offers the preferred function or the working feature of that circuit, or the working feature of that circuit. Direct grounding is brought out by direct correlation to the grounding system. Indirect grounding is accomplished by binding to the grounding system through active resistance.