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Question
What is the min and max ohmic value for earthing?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
it's depend on system
Basicaly for LV system it should be less than 1 ohm and
for MV system it should be in rage of 1 to 5 omh
ideal is 0 resistance but practically it is not possible
 
Is This Answer Correct ?    38 Yes 1 No
Sham
 
Answer
# 2
It is depending on usage
LV- for copmutor/ electronic device --- 0- 1 ohm
for UPS --- 0- 1 ohm
HV - for substaion/ power generating system- 0- 5 ohm

but 0 is not possible.
 
Is This Answer Correct ?    24 Yes 3 No
Satya Dev ( Knight Frank)
 
 
 
Answer
# 3
min <.5
max 8
 
Is This Answer Correct ?    22 Yes 7 No
Ppc
 
Answer
# 4
min<1 ohm
max 5ohm
 
Is This Answer Correct ?    9 Yes 3 No
Suresh
 
Answer
# 5
For derty Earth: the min is zero as ideal case and the
maximum shoildn't more that 1.5 ohm.

For Clean earth the min as before and the maximum is 1 ohm.
 
Is This Answer Correct ?    4 Yes 3 No
Mgalalkhedr
 
Answer
# 6
It depends on the system and the resistivity of the
soil .Minimum is less than 1 ,Maximum is 10 ohms .
 
Is This Answer Correct ?    5 Yes 4 No
Ahmed
 
Answer
# 7
Individual value should be less than 5 Ohms , as low as
possible, Combined value to be < 1 ohms , it is not
dependent on voltage level
 
Is This Answer Correct ?    1 Yes 0 No
Arjun
 
Answer
# 8
The whole list of answers is confusing.
No one is telling the correct values for a normal
Industrial machinery which sometimes includes sophisticated
machinery using Computers and electronics circuit.
I want to check the earthing status of some of the Earths I
did about 5 years ago in my factory.
Can someone help me in this.
R Prakash
rprakash@rataneng.com
 
Is This Answer Correct ?    0 Yes 0 No
R Prakash
 
Answer
# 9
mim 0.1om 
Is This Answer Correct ?    0 Yes 0 No
Amar Dev
 
Answer
# 10
Max-1 Ohm. 
Is This Answer Correct ?    0 Yes 0 No
Simon
 

 
 
 
Other Electrical Engineering Interview Questions
 
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what is the diff of mcb and mccb Sterling-Wilson 2
what is the difference between isolation and insolation ? please explain in detail with example. ABB 5
125Kva Dg can take up how much amphere load. Indian-Railways 4
what is voltage present between to phases in a three phase motor?   1
Why the colour of insulator is always is chocolate in colour? Mrf 1
HOW isolation transformer works.   2
Why earthing done? CBRE 1
requirements for making parallel operation of Uninterrupted power supply Emerson 2
Even when a particular generator in a generating station is under maintenance we are still able to maintain the same power output. How is this possible? Does the tie line between 2 generating stations have a role to play in it? NTPC 1
What is the difference between neutral and ground? Torrent-Power 2
In Aeroplane what circuitry or method use for earthing? Bhel 9
what is difference betwen genrator and alternator? Tanfac 2
 
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