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 (3078)
 Mechanical Engineering interview questions  Mechanical Engineering Interview Questions (3289)
 Electrical Engineering interview questions  Electrical Engineering Interview Questions (13331)
 Electronics Communications interview questions  Electronics Communications Interview Questions (2363)
 Chemical Engineering interview questions  Chemical Engineering Interview Questions (416)
 Aeronautical Engineering interview questions  Aeronautical Engineering Interview Questions (77)
 Bio Engineering interview questions  Bio Engineering Interview Questions (17)
 Metallurgy interview questions  Metallurgy Interview Questions (79)
 Industrial Engineering interview questions  Industrial Engineering Interview Questions (163)
 Instrumentation interview questions  Instrumentation Interview Questions (2381)
 Automobile Engineering interview questions  Automobile Engineering Interview Questions (106)
 Mechatronics Engineering interview questions  Mechatronics Engineering Interview Questions (38)
 Marine Engineering interview questions  Marine Engineering Interview Questions (43)
 Power Plant Engineering interview questions  Power Plant Engineering Interview Questions (77)
 Engineering AllOther interview questions  Engineering AllOther Interview Questions (1196)
Question
why ELCB can't work if N input of ELCB do not connect to 
ground?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
ELCB is used to detect earth leakage fault. Once the phase
and neutral are connected in an ELCB, the current will flow
through phase and that much current will have to return
neutral so resultanr current is zero. Once there is a
ground fault in the load side, current from phase will
directly pass through earth and it will not return through
neutral through ELCB. That means once side current is going
and not returning and hence because of this difference in
current ELCB wil trip and it will safe guard the other
circuits from faulty loads. If the neutral is not grounded,
fault current will definitely high and that full fault
current will come back through ELCB, and there will be no
difference in current.
 
Is This Answer Correct ?    29 Yes 8 No
Suresh Kumar
 
Answer
# 2
the main function of the ELCB is to trip the circuit when
ever the fault in earth ocuurs so it needs a ground
referance. other wise it will not work
 
Is This Answer Correct ?    19 Yes 5 No
Dayal Varma
 
 
 
Answer
# 3
Hi,all, i've got a problem with the understanding of ELCB,
may i know if only Red and yellow phase (2 wire of 3 phase)
connected to 4 pole ELCB? Does ELCB need a neutral to make
it work?
 
Is This Answer Correct ?    9 Yes 2 No
Chiss
 
Answer
# 4
No, it doesnt need earth wire to be connected to elcb/rccb. But it is recommended to connect every electrical appliances in your house with earth wire/ground. When there is a leakage, the lccb will detect that current in the live wire is higher than current that returns to neutral wire through lccb. Because the two currents is not balance, lccb will cut off the electricity. For more info u can refer to this site: http://www.gcsescience.com/pme9.htm 
Is This Answer Correct ?    7 Yes 1 No
Rayvandy
 

 
 
 
Other Electrical Engineering Interview Questions
 
  Question Asked @ Answers
 
what diff. between earth nd neutral? NTPC 2
what is IP 55 & IP 54 ?   1
How can we define 'Phase'   3
what is the meaning of trippe time of circuit breaker   1
Which has more losses, AC or DC?? TATA 4
What is harmonics. How does it get generated and means to arrest harmonics Airtel 8
why Line voltage =1.732XPhase voltage what mean by 1.732 NCC 4
what methods are used to improve power factor?   3
IF 3 NOS.OF HEATERS,3KW CAPACITY EACH,1 NO.HEATER CONNECTED IN R PHASE,1 IN Y PHASE AND 1 IN B PHASE.THEIR END POINTS CONNECTED IN STAR.IF I CONNECT THIS STAR POINT TO NEUTRAL OR DO NOT CONNECT TO NEUTRAL.WHAT WILL THE DIFFERENCE.   3
Why more than 2.5 MVA distribution transformers (secondary is 440V)are not used in india.   1
what is the purpose of starter in tube light?what is it operation .   1
in alternator why on load terminal voltage is less than no load teprminal voltage   1
 
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