Electrical Earthing

Electrical Earthing


The process of transferring the immediate discharge of the electrical energy directly to the earth by the help of the low resistance wire is known as the electrical Earthing. The electrical Earthing is done by connecting the non-current carrying part of the equipment or neutral of supply system to the ground. The Earthing provides the simple path to the leakage current

Types of Electrical Earthing


There are two types of Electrical Earthing
1.   System or neutral Earthing
2.   Equipment Earthing

System or neutral Earthing
          All power systems of today operate with grounded neutrals. The neutral of the system is directly connected to earth by the help of the GI wire/ GI Strip. The neutral grounding is an important aspect of power system design because the performance of the system regarding short circuits, stability, protection, etc., is greatly affected by the condition of the neutral.
Some of the advantages of neutral Earthing are as follows
1.   Voltages of phases are limited to the line-to-ground voltages.
2.   Surge voltage due to arcing grounds is eliminated.
3.   The overvoltage’s due to lightning discharged to ground.
4.   It provides greater safety to personnel and equipment.
5.   It provides improved service reliability.



Equipment Earthing
          It is different from neutral point Earthing. Equipment Earthing means connecting the non-current carrying metallic parts in the neighbouring of electrical circuits to earth. The non-current carrying parts include the following
1.   Motor body, Switchgear metal enclosure, transformer tank, conduits of wiring etc.
2.   Support structures, tower, poles
3.   Sheets and cables
4.   Body of portable equipment such as electric iron, drill, trolley

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