800a siemens vcb in our company can not be closed electrcally an mechanicaly cc and oc coils are found ok. why?

2 Answers  

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How to choose primany and secondary side MCB

1 Answers  

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Why positive terminal of DC 48V was earthed?

1 Answers  

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Why neutral shows voltage with earth ?

2 Answers   MRF,

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what are the main hormonics in ac?

1 Answers  

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wats the procedure to calculate no of batteries for ups?

1 Answers  

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what's the thickness of 1.5sqmm wire

1 Answers   Bhel,

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What is differance between Slip ring motor and Squirrel cage Motor ?

2 Answers  

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IF i have switchgear with busbar current rating of 1000Amp 35kA then is it necessary to have outgoing breaker kA rating to be equal to busbar kA rating?

6 Answers   L&T,

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I have seen 1 video in which a person getting shock while standing at top of a train,i have 1 question? why the people sitting in the train doesn't get shock while that man getting shock from top of the train? How the earthing of train works?

17 Answers   Bhel,

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In three phase supply why we use R Y B Colour not other.

4 Answers  

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1.what is the funtion of chiller primary & scondary pumps. 2.what is the use of distribution lines & Types. 3.what is the use the thermal power stations & how much capacity.

0 Answers   Wipro,

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