ALLInterview.com :: Home Page            
 Advertise your Business Here     
Browse  |   Placement Papers  |   Company  |   Code Snippets  |   Certifications  |   Visa Questions
Post Question  |   Post Answer  |   My Panel  |   Search  |   Articles  |   Topics  |   ERRORS new
   Refer this Site  Refer This Site to Your Friends  Site Map  Bookmark this Site  Set it as your HomePage  Contact Us     Login  |  Sign Up                      
Google
   
 
Categories >> Engineering >> Electrical Engineering
 
 


 

 
 Civil Engineering interview questions  Civil Engineering Interview Questions (3154)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3310)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13485)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2395)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (424)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (80)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (166)
 Instrumentation interview questions  Instrumentation Interview Questions (2409)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (109)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (45)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (81)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1207)
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 ?    87 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 28 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 ?    24 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 ?    18 Yes 3 No
Mitesh V Dixit
 
Answer
# 5
not more than 2 ohm for good earthing 
Is This Answer Correct ?    15 Yes 3 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
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
What phase difference between p and s winding of transformer MAHINDRA 1
what is the electricity   3
How Can we calculate the rating of a cable?Show the formula? Jindal 2
What is the purpose of shunt trip in ACB function?   1
What are the safety devices on Cumins Diesel Generators from 500 kva to 1500 kva. Maruti-Suzuki 1
Short circuit voltage of a transformer mainly depend on A ohmic resistance of primary B ohmic resistance of secondary C magnitude of leakage flux D cross sectional area of core   1
friends., why celling fan rotate cockwise direction and wall fan anticickwise direction ?   3
what is Distance protection & how did it work   2
Why DG set rating in KVA Crompton-Greaves 11
what is diffrence between MH LAMP and HELLOZEN LAMP   1
why do we prefer -48 volt instead of -24volt or -12 volt etc. ??   1
WHY CFL can't made in shape of bulb.   5
 
For more Electrical Engineering Interview Questions Click Here 
 
 
 
 
 


   
Copyright Policy  |  Terms of Service  |  Articles  |  Site Map  |  RSS Site Map  |  Contact Us
   
Copyright 2013  ALLInterview.com.  All Rights Reserved.

ALLInterview.com   ::  KalAajKal.com