What are the Different Types of Earthing Systems Used in Electrical Installation?

JUly 31, 2020

The number of equipment and devices that rely on electricity is increasing every year. As technological advancements and innovations expand, the reliance on stable electrical power continues to grow. Given these premises, it is inevitable that various property owners will certainly find and apply a solution just to give a stable, safe, and secure source of electrical power.

One notable way of obtaining stable electricity is through a series of proper electrical installation. While the source of electricity can be abundant, the way electrical connections are installed can hugely affect the overall flow of current and the safety of the property from electrical hazards. Without proper electrical installation, a property might frequently experience faulty and flawed electrical connections.

Importance of an Earthing System

Proper electrical installation requires an efficient earthing system. This type of system, which is also known as the grounding system, connects certain parts of electrical installation with the conductive surface of the ground. The ground’s conductive surface serves as the point of reference for the electrical installation. An efficient earthing system can easily provide safety, determine electromagnetic compatibility, and maintain numerous functionalities of the whole electrical installation and its components.

The need for grounding does not ultimately revolve around electrical connections and systems. Other systems that require grounding include tall structures, telegraph lines, and radio antennas.

Codes Used for Earthing System Types

There are different types of earthing systems that properties can use for their electrical installation. These earthing systems types are represented by codes for various purposes. The first letter of the code pertains to the relationship of distribution system to the earth or ground, which can be either T (solid connection of one point to earth) or I (all live parts are isolated from earth or one point is connected to earth by an inductive impedance or resistance). 

The second letter of the code, alternatively, signifies the relationship of the installed exposed-conductive-parts to earth. T denotes that the exposed-conductive-parts are directly earthed independently of any point of the power system. N means that a low impedance conductor is removed from the earth connection at the source, which is then routed to the exposed-conductive-parts. N is further sub-divided into letters S (neutral conductor routed from the source is split up from the protective earthing conductor) and C (neutral conductor and the protective earthing conductor work as one conductor).

Different Types of Earthing System

Out of the letters mentioned above, there are five different types of earthing systems that are frequently used in different electrical installations.

  • TNC Earthing System: a single conductor is used for neutral and protective functions throughout the system.
  • TNS Earthing System: a separate protective conductor is used throughout the system.
  • TNCS Earthing System: a single conductor is used for neutral and protective functions in a part of the system.
  • TT Earthing System: one point directly earthed; exposed-conductive-parts connected earth electrodes is independent of the power system’s earth electrodes.
  • IT Earthing System: all live parts detached from the earth or one point connected to earth through an inductive impedance or resistance; exposed-conductive-parts are being earthed independently, collectively, or to the earthing of the system.

Earthing systems can help provide basic protection and fault protection. They can also minimise different risks associated with electrical systems. For more information about these types of earthing systems, just give us a call at Metro Pits.

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