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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 :: Minimanu
I also faced this Question!!     Rank Answer Posted By  
 
  Re: 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.
Answer
# 1
here the soil resistivity is high. so mat earthing is provided 
Is This Answer Correct ?    15 Yes 4 No
Joby
 
  Re: 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.
Answer
# 2
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
 
 
 
  Re: 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.
Answer
# 3
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
 
  Re: 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.
Answer
# 4
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
 

 
 
 
Other Electrical Engineering Interview Questions
 
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definition of fault level in powersystems?   4
what is the function of choke in tube   1
why the motor is rated as kw& transformer as kva Areva 7
what will be happen if we apply D.C supply to the transformer CCBPL 13
how the 6.6KV motor can be used with 11KV?   2
how we can select MCB ratings according to Voltages, Curves.   2
Why do we generate 3 Phase AC Supply? It is possible to generate 4 Phase and 5 Phase explain it?   4
State the difference between Three winding transformers and Two winding transformers ? where its used?   8
what is the difference between AHU and FCU . JLL 1
What is the purpose of taking Capacitance and Tan Delta Test in Transformer bushing?   1
In tranformer winding Connection Like Dyn1 ,so LV lags Hv by 30 deg and Dyn11 LV lead HV by 30,so how do this lagging and leading afffect the transformer??   2
while calculating demand in my company the present load in kw is 212.... there 125kvar capacitor bank is installed by spliting as 50 in departments...the diasplay in panek biard shows 175kw... how could we know the amount of kvar used to compensate the kva   1
 
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