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Question
What should be the earthing resistance of an industrial 
substation and also What should be the house hold earthing 
resistance?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
aw per IS it should not be more than 1 ohm. 
Is This Answer Correct ?    84 Yes 21 No
Ramkumar
 
Answer
# 2
For 1 kv to 33 KV The earthing Resistance Should be less
than 0.5 ohm.
For Domestic Purpose it should less than 2 ohm
Upto 1 Kv It should be in between 1 to 2 ohm
for EHV it should be less than 0.01 ohm
 
Is This Answer Correct ?    57 Yes 26 No
Ashish
 
 
 
Answer
# 3
The Earthing Resistance of a household should not be
greater than 5-Ohm. This is in keeping with the Indian
Stadards, so also the international standards, viz, IEEE
(Institution of Electrical & Electronic Engineers) and IEC
(International Electrotechnical Commission) which stipulate
that no Earthing Resistance shall be greater than 5-Ohm.
The restriction is required to ensure the safety of the
occupants and the electrical appliances.
The Earthing Resistance of a Power Station should not be
greater than 0.5-Ohm because a Power Station is required to
carry high earth currents.
The Earthing Resistance of a Major Substation such as
a "Receiving Station" or a 400kV/220kV/110kV/66kV etc
Transmission or Stepping Up/Down Substations should not be
greater than 1-Ohm.
The Earthing Resistance of a Minor Substation such as an
11kV/230V Distribution Substation should not be greater
than 2-Ohm.
This clarifies my first answer.
 
Is This Answer Correct ?    22 Yes 2 No
Manoj Mahajan
 
Answer
# 4
industrial earthing resistence should be very betwwen .5
ohms to 5 ohms.
0.5 ohms-excelent
0.5 to 1 ohms- very good
1 ohms to 1.5 ohms- good
1.5 to 2.0 ohms-satishfactory
2.0 ohms to 5 ohms- not satisfactory.
note imp- This resistence consider of near induviusal
earth pit only.equipement earthing value should be very
betwwen 0.5 ohms to 12 ohms depending on size & distence of
earthing netwerk(GI PATTI OR COPPER PATTI OR WIRE)utilise.
 
Is This Answer Correct ?    16 Yes 3 No
Mitesh V Dixit
 
Answer
# 5
not more than 2 ohm for good earthing 
Is This Answer Correct ?    14 Yes 2 No
Pijush Kanti Pal
 
Answer
# 6
ACTUALY IN EARTHING RESISTENCE OF INDUSTRIES OR RESIDENT OR
SUB STATION VALUE SHOULD BE VERY DUE TO SOIL RESISTIVITY OF
DIFFERENT AREA LAND SOIL. SUPPOSE IN NEAR SEA AREA GOA OR
OTHER THIS TYPE OF PLACE EARTH RESISTENCE VALUE SHOULD BE
EXCELLENT DUT TO HIGH MOISTURE & SALT WATER.
SO WE CAN ACTUAL MARKING THE RESISTENCE VALUE BUT IT SHOULD
BE 0.5 TO 1 OHMS IS GOOD IN ALL ASSPECT & SUFFICIENT GOOD
CONDUCTACE GEETING TO DICHARGE IN LAND.
AS PER INDIAN STANDERED DETAILS EQUIPEMENT EARTHING VALUE
SHOULD NOT INCRESED MORE THEN 11.2 OHMS. (EARTHING VALUE
MEASURE ON EQUIPEMNT IT SELF)

MITESH DIXIT
 
Is This Answer Correct ?    12 Yes 1 No
Mitesh V Dixit
 
Answer
# 7
As per IS: 3043-1966, "Code of Practice for Earthing", the
Earthing Resistance shall not be greater than 5-ohms. The
Earthing Resistance of a Power Station shall be not more
than 0.5-ohm while that of a major and a minor substation
shall be not more than 1-ohm and 2-ohms respectively.
 
Is This Answer Correct ?    11 Yes 4 No
Manoj Mahajan
 
Answer
# 8
For residential it should be below 1 ohms. For EHV stations
and constructions it should be maintained below 0.5ohms.
And for LC systems it should be maintained below 5 ohms.
 
Is This Answer Correct ?    16 Yes 11 No
Yohanraja
 
Answer
# 9
For house hold maximun value of earthing can be 4
ohms.But for a substation it should be less than 1 ohms.
 
Is This Answer Correct ?    4 Yes 0 No
Ranjeet
 
Answer
# 10
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.
 
Is This Answer Correct ?    4 Yes 0 No
Krishna Naik
 

 
 
 
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1.two coupled coils with L1=L2=0.6 H have a coupling coefficient of k=0.8 the turns ratio N1/N2 is...... SSC 3
what is the operation of regulator in fan? NTPC 4
How Many Safety of Transformer   2
What is GD2(kg-m2) for Sq. cage ind. motor? Essar 2
Due to ferranti effect which power increases at the receiving end?active power or reactive power?   5
how to calculate the speed of a induction motor without using tacho meter?   6
what is the use of CAPACITOR in CFL lamp? Areva 6
2 Diesel Generators 900KVA connected to the bus bar for essential load as an alternative for power taken from 11/440V 3KVA Transformer supplying this bus bar. my question here is in the event of power failure on 11KV side can I feed the power to 11 KV bus by using the same transformer as reverse feed, what will be the inrush current??? Ashok-Leyland 3
how can we detect that which is receiving side and which is sendind end of a trnasmmison line by just seiing it?i.e its which end is coming from genertaing and distribution side?   3
how we can save the power ? suppose the electricity board gives 11 kw , but the machine require only 8 kw means how we can save the exese energy   2
Is voltage & potential transformer are the same? Are they used for same application ?   11
 
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