Types of Earthing Systems

1. TN System

The TN (Terrestrial-Neutral) system is widely used in low-voltage installations. In this system, the neutral point of the power supply is directly connected to the earth, ensuring a low impedance path for fault currents. It offers a high level of safety and is commonly employed in residential and commercial buildings.

2. TT System

The TT (Terrestrial-Terrestrial) system involves the connection of the electrical system’s neutral point to the ground through a separate electrode. Unlike the TN system, the neutral and grounding electrodes are not physically connected, providing a higher degree of safety in case of faults. This system is typically used in areas with low fault currents or remote locations.

3. IT System

The IT (Isolated-Terrestrial) system is commonly found in industrial and healthcare settings. In this system, the neutral point is isolated from the ground, and fault currents do not flow directly to the earth. Instead, they are detected and monitored by specialized equipment. The IT system offers increased reliability and continuity of power supply.