Earthing, Grounding & Neutral
In this article, we discussed about earthing system, grounding system and its difference. Earthing system and grounding system are more over same. In UK and IEC standards we call it earthing system but in US we call it grounding system. It connects specific parts of an electric power system with the ground, typically the Earth’s conductive surface, for safety and functional purposes. The earthing system we use can affect the safety and electromagnetic compatibility of the installation. In addition to electric power systems, other systems may require grounding for safety or function.
Three Main Purposes for Earthing
System earthing serves a purpose of electrical safety throughout the system that is not caused by an electrical fault. Its main purpose is to prevent static buildup and to protect against power surges caused by nearby lightning strikes or switching. System earthing also allows for equipotential bonding to all metalworks to prevent potential differences between them. Having Earth as a common reference point also keeps the electrical system’s potential difference limited to the supply voltage.
Equipment earthing serves a purpose of electrical safety in an electrical fault. Its main purpose is to prevent equipment damage and the risk of an electric shock. When current flows from a line conductor to an earth wire, RCD will automatically open the circuit to clear the fault.
Functional earthing serves a purpose other than electrical safety. Example purposes include electromagnetic interference (EMI) filtering in an EMI filter, and the use of the Earth as a return path in a single-wire earth return distribution system.
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