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Question
What are the various methods for effecive earthing in a 
factory in a rocky terrain, where soil resistivity is 
extraordinarily high? The usual method of 3 m deep earth 
pits is not serving the purpose.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
here the soil resistivity is high. so mat earthing is provided 
Is This Answer Correct ?    15 Yes 4 No
Joby
 
Answer
# 2
If Earthing Resistance Value is more than minimum specified
value & one pit can not serving the you have to provide
Three to Four Earthing Pit Which are Interconnected
Together Making The Earthing Mat So The Total Effective
Value Will be Less.
 
Is This Answer Correct ?    14 Yes 3 No
Ashish
 
 
 
Answer
# 3
Import good black soil from some where else,mix it with alot
of salt and charcoal dust, dig atleast 2 pits in a space of
10metres apart.
Let each pit have its own earth mat and burry it wit the
mixture mentioned above ie salt, black soil and charcoal
dust and then bond or interconnect the earth mats wit an
earthwire of ATLEAST 35mm2.
Finally pour alot of water in the pits.
 
Is This Answer Correct ?    5 Yes 0 No
Brian
 
Answer
# 4
There are some powders which harden (i.e. erico make some I
think). Generally would drill a fairly deep hole. insert
earthing rod and surround with these earthing enhancers.
Try to avoid gell or powder forms of earth enhancer as they
tend to wash away when it rains
 
Is This Answer Correct ?    7 Yes 4 No
Blake Australia
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
Dear Sirs, I am a technical persons.In one of our Electrical Sub- Station, We have installed three numbers of 1250KVA ,11KV/0.415KV Transformer to feed the Factory load. We have found some abnormality. In one of our Transformers the leakeage current from transformer body to earth through earth continuity wire is almost 86 Amp but in other transformer it is (5-10)Amp. where the load current on three phase and neutral are respectively 1360Amp,1400Amp,1370 Amp & 176Amp. So please any technical person help me about the reasons of this situation and how I can rectify the fault. Moreover,I have measured the earth resistance of the Earth continuity wire which is less than 1 Ohm. Thanks Tapas Barua   2
what is the right cable size for 100 hp mpter.   3
we can use airconditioner for cooling the winding of transformer ,if not why?   3
how ELCB drip when earth and phase touch together?   1
what is resistor   9
How to calculate the NGR value for a 2.7MVA Transfomer, 11KV system where the fault current has to be limited to 50A? Sterling-Wilson 1
how many number of terminals are available in CURRENT TRANSFORMER MSETCL-Maharashtra-State-Electricity-Transmission-Co-Ltd 3
Transformer/insulating oil tester(BDV tester)   1
what is the earth to neutral voltage(maximum and minimum) according to ieee standards   4
DOES AN EARTH FAULT CURRENT ON THE DELTA SIDE OF A 6.6/33KV STEP UP STAR-DELTA CONNECTED TRANSFORMER REFLECT ON THE STAR SIDE? IF YES, THEN HOW AND WHAT IS THE AMOUNT OF CURRENT REFLECTED?   1
how to calculate neutral current in three phase four wire system Auto-Meters 1
Explain difference between aluminium coductor & copper coductor.   4
 
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