I've descovered that when the earth wire in a domestic electrical installation is not connected back to the board (ground) a voltage of between 9-24v is is found to be present in the earth wire. When connected at the board there is no voltage - is this normal and why does it happen?

3 Answers  

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how induction motor starts?

4 Answers   JSL,

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what are all the daily preventive maintainance carried out in transformer?

1 Answers  

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We have one Energy meter for Measuring the voltage,current,power,energy(KWH,KVARH,KVAH) & power factor.The problem is that the meter does not show whether the PF is lagging or leading.So i want to know that is there any way or calculation to find out that whether the PF sign (lagging or leading) depending upon the above mentioned parameters?

4 Answers  

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Any one can explaination about calibration with rotating sub standards?

0 Answers  

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how u select control transformer for a mccb panels or any panels?for expample we hav 440 volts maim supply and control volts is 230v?

0 Answers  

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What happens with squirrel induction machines if the ends of rotor conductors are kept open? Explain

3 Answers  

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What is meant by regenerative braking?

5 Answers  

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How the power factor is more in high speed machines

1 Answers  

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The sodium vapor lamp is not glows when it is connected a distance of 5 meters above from gearbox, why ?

0 Answers   Ispat,

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Name one of major transformer company in KSA ?

0 Answers  

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In scott connection why connect teaser transformer to 86.6% and main transformer to 50%..

1 Answers   Silicon,

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