Difference points of Earthing and grounding.pdf

About earthing

1. under nomal condition) to he earth for
example clectrical equipment's frames,
enclosures, supports etc.
It is equipment earthing.
The purpose of earthing is to minimize risk of
receiving an electric shock if touching metal
parts when a lcakage current is present.
Earthing is an allernatc low resistance path for Grounding is a sourcc for unwanted
leakage current.
EEarthing connections are of four types:
Plate earthing
Pipe carthing
current under nommal condition) to the
earth or example neutral of transformer.
The purpose of carthing is to minimize risk of It is provided for climinating arcing
receiving an electric shock to human.
Generally Green wire is used for this as a
nomenclature.
Rod earthing
Strip earthing
It is source or syslem earthing
It is nothing to do with the system stability.
It does not provide any means for protection
systen against carth faut.
currents and also as a retum path for
main current for protection of delicate
cquipments.
Grounding is done for the protections of
power system equipment and to provide
an effective return path.
ground and over volage surge.
Generally Black wire is used for this as a
nomenclature.
E Grounding connections are of three
Lypes:
Solid earthing
Resistance earthing
Reactance earthing
I ncreases stab:lity of the system.
This arnhing provides suitable means for
arlh uli protecting sslem.
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