Answer / ngundam

For house hold maximun value of earthing can be 2
ohms.But for a substation it should be less than 1 ohms.

Answer / krishna naik

The earthing resistance of an industrial substation
should maintain always below 1 ohm. it measured of
resistance between earth plae and natural earth by ohm
meter. when earth resistance is near to zero means better
earthing.
The household earthing resistance somewhat slight above
1 ohm and below 2 ohm is the tollerable limit, but never
neglect above 2 ohm. the resistance below 1 ohm means more
safety.

Answer / abhi

for industries it should be less than 1 ohms

Answer / kishore

Less than 2 ohm

Answer / tanmoy dutta

400 s/s kv as per IS 2026 should not be grater then 0.5 ohm
220............DO.................................. 1 ....
depend on soil resistivity.

Answer / pankaj datreliya

How Many 11kv Trasformer Body & Neutral Earthing value?14th Floor LA Earthing Value.and Panel Body earthing value.

Answer / dev123kk

should be less than 1 ohm

Answer / abhaya raj singh

according to IEEE maximun value of earthing can be 5
ohms.But for a substation it should be less than 2 ohms.

Answer / kaviraj

if v want to gnd that current to the earth y v want to use a resistance better v can use a wire with 0 resistance so all the fault currents will be by passed.

Answer / sayyed

hor residential area the earthing resistance should be less
than 1 ohm.
for substation of capacity less than 33 kv the resistance
in between 1-3 ohm.

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2 Answers  

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why transformer rating in kva and motor rating in kw

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