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Question
Technical requirement of Copper earthing over GI earthing.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
There arent much technical things between the two. the
current carrying capacity of the copper is more than GI.
Iron is prone to rusting after a certain time it completely
stops conducting to ground.
 
Is This Answer Correct ?    6 Yes 0 No
Cnu
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?   5
Just a silly question but just to make my curious mind bac to normal - Why was not 67 and 67N relays built into a single relay as i have noticed that the R,Y,B CT wiring end up into the 67 relay while the common of the R,Y,B CT wiring end up into the 67N relay. Then it was better if a single relay was manufactured just like the distance relay (21). Another question i would like to ask is - how do we know where the 67 and 67 N relay has to be placed.why is it not placed at the transformer bay? In the substaion that i am working -i have noticed that it is placed between a breaker and a common double bus bar and this line bay is connected to another substation at a remote place which is furthur connected to a load. B U S______CT for 67 & 67N ______Breaker _____ remot s/s. B A R   1
why transformers are sometimes kept on concrete benches..?   2
what is purpose of manual bybass in ups   3
In any plant or substation main incommer voltage RY - 415 V,YB - 400 V, BR - 387 V(in commer feed from transformer 11 Kv /0.415 KV) why found voltage differance in each phase? plant have not self power plant it is depend on outsource grid   2
how system fault level is calculated? HCL 1
what is the use of vcb & isolator in substation?   4
1.what is the easiest way to convert AH(ampere hour)to watts?.   2
can we share mvar in parrelell connected alternators   2
what is the formula for transformer oil?   1
What type of bulb used in small size cross symbol boder and original flame type(Deepam)?   1
wath is skin effect?   9
 
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