What should be the minimum and maximum ohmic value for earthing?

What should be the minimum and maximum ohmic value for
earthing?

Question Posted / jagan

2 Answers
5970 Views
I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

What should be the minimum and maximum ohmic value for earthing? ..

Answer / p.r.gowri sankar

Earthing Resistance between the phase to earth is must be
below the value is 0.5ohms.

Is This Answer Correct ?

4 Yes

2 No

What should be the minimum and maximum ohmic value for earthing? ..

Answer / engr. rohail joses

Normally the Earthing Resistance value while designing Earthing Systems for Power Plants is kept below 1 Ohm, this value ensures Step and Touch Voltages not acceding their safety limits.Also the GPR (Ground Potential Rise) during Lightning Discharge, Line to Line and Line to ground Faults for less than 1 Ohm Earthing Resistance is also confined within its safe limits and Earthing System is with less than 1 Ohm Earth Resistance becomes fully capable to dissipate/ handle this Destructive phenomenon. This is as per IEEE Standard [IEEE Std 80-2000]. However for small substations and Industries Earthing Resistance value of less than 5 Ohm is also acceptable.

Is This Answer Correct ?

0 Yes

0 No

Post New Answer

More Electrical Engineering Interview Questions

how to calculate KA rating of C.B?explain with Formula.

1 Answers

In case of salient pole alternator when number of poles are 4 or more than 4 it helps the flux wave to be sinusoid as air gap length is increased from center to tip , but if the number of poles are 2 how does the flux wave is sinusoidal?

0 Answers

What could be the problem if two power transformers trip on stand by earth fault at same time

1 Answers

A ii kv 1200 A Breaker combination fixed in a cubicle. How many ampere Fuse is required? If fuse is not using, Why?

0 Answers

how we are measuring the winding temperature of the transformer?

11 Answers

After doubling voltage from solar cells & use step down voltage transformer can we get high current output with low voltage.

0 Answers Transco,

The rating of Transformer are 11KV, 22KV, 33KV instead of 10KV, 20KV & 30KV?

2 Answers

How relay coordination has to be done? what are the inputs are required for this? Please explain this with calculation method?

0 Answers Elektrotek,

What does the a,b,c of 95a,95b,95c relays denotes?

0 Answers KSEB,

WHY THE +VE POLARITY OF 48V DC POWER SUPPLY IS USUALLY GROUNDED?

1 Answers Tulip,

Why dnt we generate 5-ph or 7-ph supply like as 3-ph supply

2 Answers

FULL FORM OF MCCB

3 Answers

For more Electrical Engineering Interview Questions Click Here