" Welcome to Dynamic Earthing "
Why Earthing is Important?
The primary purpose of earthing is to avoid or minimize the danger of electrocution, fire due to earth leakage of current through undesired path and to ensure that the potential of a current carrying conductor does not rise with respect to the earth than its designed insulation.
When the metallic part of electrical appliances (parts that can conduct or allow passage of electric current) comes in contact with a live wire, maybe due to failure of installations or failure in cable insulation, the metal become charged and static charge accumulates on it. If a person touches such a charged metal, the result is a severe shock.
To avoid such instances, the power supply systems and parts of appliances have to be earthed so as to transfer the charge directly to the earth. This is why we need Electrical Earthing or Grounding in electrical installation systems and parts of appliances have to be earthed so as to transfer the charge directly to the earth. This is why we need Electrical Earthing or Grounding in electrical installation systems.
Below are the basic needs of Earthing.
- To protect human lives as well as provide safety to electrical devices and appliances from leakage current.
- To keep voltage as constant in the healthy phase (If fault occurs on any one phase).
- To Protect Electric system and buildings form lighting.
- To serve as a return conductor in electric traction system and communication.
- To avoid the risk of fire in electrical installation systems.
Different Terms used in Electrical Earthing
- Earth: The proper connection between electrical installation systems via conductor to the buried plate in the earth is known as Earth.
- Earthed: When an electrical device, appliance or wiring systems connected to the earth through earth electrode, it is known as earthed device or simple "Earthed".
- To warrant that all pieces of equipment in use by the occupants of a building are at Earth Potential, thus safeguarding them from electric shocks through direct contact
- To protect electrical apparatus from getting damaged due to weighty currents along electrical lines
- To sustain stable voltages in three phase circuits even under unstable load state
- To protect tall buildings from getting harmed under lightning
