The earthing system, sometimes simply called ‘earthing’, is the total set of measures used to connect an electrically conductive part to earth. The earthing system is an essential part of power networks at both high- and low-voltage levels.
A good earthing system is required for:
· Protection of buildings and installations against lightning
· Safety of human and animal life by limiting touch and step voltages to safe values
· Electromagnetic compatibility (EMC) i.e. limitation of electromagnetic disturbances
· Correct operation of the electricity supply network and to ensure good power quality.
All these functions are provided by a single earthing system that has to be designed to fulfil all the requirements. Some elements of an earthing system may be provided to fulfil a specific purpose, but are nevertheless part of one single earthing system. Standards require all earthing measures within an installation to be bonded together, forming one system.
I agree! the most important thing on installations of lightning make sure it is safe to human.
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