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Grounding and Bonding 

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In electrical engineering, ground or earth is the reference point in an electrical circuit from which voltages are measured, a common return path for electric current, or a direct physical connection to the earth.

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An earth ground connection of the exposed conductive parts of electrical equipment helps protect from electric shock by keeping the exposed conductive surface of connected devices close to earth potential when a failure of electrical insulation occurs.

 

In addition to electric power systems, other systems may require grounding for safety or function.  Structures may have lightning rods as part of a system to protect them from lightning strikes. 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. Radio antennas may require particular grounding for operation, as well as to control static electricity and provide lightning protection.

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Application of Earthing 

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  1. Protect Humans against Lightning and Earth Fault.

  2. Protect premises against lightning and earth fault conditions.

  3. Provide low resistance and safe path for lightning and fault current.

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