Question

Give the justification with diagram — "Earthing saves human life during Electrical faults". State adverse effect of improper earthing system.

Answer 1

Justification of "Earthing saves human life during Electrical faults":
 As per the above figure if earthing not done to the electrical equipment, at the time of
insulation puncher (Means ground fault) the operator can get electrical shock.
To avoid this :
 If the metal body is connected to the earth then the earthing resistance is very less as
compare to human body resistance and hence at the time ground fault all leakage current
passes through the earth pit and the danger of electric shock to the operator is avoided.
 Thus we can conclude that by proper earthing human life is saved.
Adverse effect of improper earthing system:
 There will be danger of electric shock to the human life.
 Danger of lightening stroke will be severe.
 Due to absence of earth wire there will be malfunctioning of relays and other switchgear
operations.
 Poor service reliability
 Improper earthing may cause burns from arcing
 Tools plugged into improper earthing circuit may become energized.