Earthing is the connection between the non-current carrying metallic parts of electrical machine, equipment and earth.
Requirement of Earthing :
- It should protect person and equipment from damage due to over voltage.
- It should flow leakage currents to earth during faulty condition of devices.
- Electro-magnetic Distrubance are eliminate by proper Eathing.
- It should stabilizer circuit protection.
- All voltage level appliance at domestic & commercial.
- Metallic Equipment body earthing.
- Transmission, Distribution & telecommunication system.
- Power generating station and substation.
- Lighting Arrester earthing.
- Three phase(Transformer) neutral earthing.
- Sensitive electronic equipment.
- At where electrical safety necessary.