Answer / gopi

electrical earthing is the basic step to be taken for
protection of personnel and equipment in case of fault like
over current and over voltage conditions. even system
equipment should earthed to prevent damage of internal
equipment.

Answer / saravanan

to aviod electric shock in humen. . in eqipment protection
used for fuse..over load relay etc..

Answer / syam mohan

through earth the return path of the distribution system
completes

Answer / eduardo

Sorry. There is another reason that I have completly forgot.
I am not sure about the english term but I think is "static
electricity". Electrical charges apeares in an isolating
material with friction and they must be discharge to the
earth. Examples are for the buildings that create electrical
charges with the wind. So to discharge them you must connect
it to earth. Another very well known example is for
combustibles. As the electrical charges in pipes or in
trucks can create a spark (bolt) and they are a potencial
font of ignition. Normaly both trucks, pipes, and fuel tanks
are connetct with eachother and also to earth.

Answer / eduardo

None.
In the power transformer is useful only for having a
reference of the power voltage relating to the earth.
We can calculate for instance the degree of isualtion we
need. For example, an electrical cabinet, that is connect to
the earth, (they do not lies in the air) and have lives
conductor.

give me the details of anti pumping relay

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