Answer / divyesh

to give low resistance and if one earth is out of
order,second will do the required work of earthing the equipment

Answer / bilal mir

Double earthing is
used to give
minimum
resistance to the
flow of whole
current of the
apparatus in case
of short circuit or
leakage or any
such other fault.

Answer / dinakaran

for safty purpose only. if one is failure another in line

Answer / pravin

1.For safety of personnel & equipment
2.Reduces voltage fluctuation in case of excess current flow.
3.In case non use of tripping devices it reduces the risk of electrocution.

Answer / sohaib ahamad

to give low resistance and if one earth is out of
order,second will do the required work of earthing the equipment

Answer / prabakaran

Earth1 value=1ohm earth2 valu=1ohm
Parallel resistance formula =r1+r2/r1×r2 so answer=1/2 so earth value reduse so better to current flow on ground

Answer / himanshu saini

For safety purpose,if any short circuit in line or excess current flow in line and single earthing not proper working then double wire earthing pass that current and tripped the MCB of welding machine

which fault current is maximum: 3 phase short circuit, LG, LL or LLG?? why?? in one of the problems that i have solved, 3 phase short circuit current on an unloaded generator came out to be less than the LG fault current. can anybody please explain why.

2 Answers   Bhel,

What is HT? And specify the range of voltage?

5 Answers   HSL,

what can i do line to line fault

4 Answers  

how to find out this one mcb r mccb?

4 Answers   L&T,

How RTCC panel is working and give single line diagram for RTCC with transformer?

0 Answers   AB Associates,

How do you convert the lt amps on a transformer to the ht amps?

2 Answers  

what is the problem with single phase AC motors and how is it overcome?

2 Answers  

The neutarl to earth voltage in system is 7volts on Electricity power but it lowers to 1.3volts when load transfered to DG power.what may be the reason.

3 Answers  

Why dont we get shock while testing for voltage with a line tester? How the bulb inside the tester glows while testing with tester coz we are totaly isolated from earth or we are not giving close path for the current to flow?

3 Answers  

why use phase displacement in transformer.and effect of phase displacement on transformer

0 Answers   IOCL, ONGC,

Why we use series reactor in power system?

9 Answers   Cadbury, HEG, Uttam,

hii this is ranjith from hyd... i want to know what type of questions they ask in interview...and hw the interview will go..? what subjects thay ask specially for electrical engg students?

0 Answers