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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
 

 
 
 
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