In an electrical installation an earthing system or grounding system connects specific parts of that installation with the Earth's conductive surface for safety and functional purposes. Telegraph lines may use the Earth as one conductor of a circuit, saving the cost of installation of a return wire over a long circuit.
Also asked, what is the purpose of a grounding electrode system?
The purpose of the grounding electrode and grounding electrode conductor is to connect the separately derived system/transformer grounded conductor or equipment to ground (earth), to limit the voltage imposed by line surges and to stabilize the transformer secondary voltage to ground during normal operation (Photo 3).
What is the definition of a grounding electrode?
The conductor used to connect the non-current-carrying metal parts of equipment, raceways and other enclosures to the system grounded conductor, grounding electrode conductor, or both, at the service equipment or at the source of a separately-derived system.
What is the purpose of an earth rod?
A ground rod or a ground field's only purpose in life is to have a designed electrical path to dissipate a static discharge voltage (such as Lightning) to earth. If you place a current probe around the conductor going to earth or the ground rod itself you should never see any current flowing on the conductor.