explain the principle of earthing
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This section deals with the earthing and equipotential bonding of information-technology devices and other similar devices requiring interconnections for signalling purposes.
Earthing networks are designed to fulfil a number of functions. They can be independent or operate together to provide one or more of the following:
Safety of persons with respect to electrical hazardsProtection of equipment with respect to electrical hazardsA reference value for reliable, high-quality signalsSatisfactory EMC performance
The system earthing arrangement is generally designed and installed in view of obtaining a low impedance capable of diverting fault currents and HF currents away from electronic devices and systems. There are different types of system earthing arrangements and some require that specific conditions be met. These conditions are not always met in typical installations. The recommendations presented in this section are intended for such installations.
For professional and industrial installations, a common bonding network (CBN) may be useful to ensure better EMC performance with respect to the following points:
Digital systems and new technologiesCompliance with the EMC essential requirements of Directive 2004/108/EC(emission and immunity)The wide number of electrical applicationsA high level of system safety and security, as well as reliability and/or availability
For residential premises, however, where the use of electrical devices is limited, an isolated bonding network (IBN) or, even better, a mesh IBN may be a solution.
Earthing networks are designed to fulfil a number of functions. They can be independent or operate together to provide one or more of the following:
Safety of persons with respect to electrical hazardsProtection of equipment with respect to electrical hazardsA reference value for reliable, high-quality signalsSatisfactory EMC performance
The system earthing arrangement is generally designed and installed in view of obtaining a low impedance capable of diverting fault currents and HF currents away from electronic devices and systems. There are different types of system earthing arrangements and some require that specific conditions be met. These conditions are not always met in typical installations. The recommendations presented in this section are intended for such installations.
For professional and industrial installations, a common bonding network (CBN) may be useful to ensure better EMC performance with respect to the following points:
Digital systems and new technologiesCompliance with the EMC essential requirements of Directive 2004/108/EC(emission and immunity)The wide number of electrical applicationsA high level of system safety and security, as well as reliability and/or availability
For residential premises, however, where the use of electrical devices is limited, an isolated bonding network (IBN) or, even better, a mesh IBN may be a solution.
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The electrical earthing is done by connecting the non-current carrying part of the equipment or neutral of supply system to the ground. ... The earthing provides the simple path to the leakage current. The shortcircuit current of the equipment passes to the earth which has zero potential.
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