Answer / sham

it's depend on system
Basicaly for LV system it should be less than 1 ohm and
for MV system it should be in rage of 1 to 5 omh
ideal is 0 resistance but practically it is not possible

Answer / satya dev ( knight frank)

It is depending on usage
LV- for copmutor/ electronic device --- 0- 1 ohm
for UPS --- 0- 1 ohm
HV - for substaion/ power generating system- 0- 5 ohm

but 0 is not possible.

Answer / ppc

min <.5
max 8

Answer / suresh

min<1 ohm
max 5ohm

Answer / ahmed

It depends on the system and the resistivity of the
soil .Minimum is less than 1 ,Maximum is 10 ohms .

Answer / mgalalkhedr

For derty Earth: the min is zero as ideal case and the
maximum shoildn't more that 1.5 ohm.

For Clean earth the min as before and the maximum is 1 ohm.

Answer / r prakash

The whole list of answers is confusing.
No one is telling the correct values for a normal
Industrial machinery which sometimes includes sophisticated
machinery using Computers and electronics circuit.
I want to check the earthing status of some of the Earths I
did about 5 years ago in my factory.
Can someone help me in this.
R Prakash
rprakash@rataneng.com

Answer / simon

Max-1 Ohm.

Answer / arjun

Individual value should be less than 5 Ohms , as low as
possible, Combined value to be < 1 ohms , it is not
dependent on voltage level

Answer / ajay

Ideally zero
for generating substation 0-1 ohm
for transmission system 2-4 ohm
for distribution system 2-5 ohm

Ehat is shunt motor?

4 Answers   L&T, Siemens,

why Transformer and DG rating capacity is in KVA

4 Answers   ACC,

why the earth terminal in three pin top is longer than rest of the two terminal and of bigger size?

6 Answers   BARC, MAHINDRA,

when we switch on the switch and load is not connected at home,is electricity wasted?

1 Answers  

why most of the induction motors are delta connected?

7 Answers  

What is the normal value of delta in rotor angle stability or transient stability? Why it selected so?

1 Answers  

What is mean by PID controller? And what is its Long form?

9 Answers   Jindal,

what is the mechanical safety of DG ?

0 Answers  

Is it recommended to apply H.pot test for new cables segments after terminations or joints, however, this cable has been tested before at the manufactor by the vendor ? or only we can apply megger tests ?

1 Answers   Centroid,

for 1000kva transformer how kvar rating is need for this PFI plant. and how does it will calculate? and Apmpere rating of main cable connection?

6 Answers   Engineers India, GCC, KP, QPSL, Siemens,

5MVA TRANSFORMER SUDDENLY FAIL WITH THE PRV TRIPPING AND LARGE AMOUNT OF OIL SPREAD OUT? SO IT CAME BACK WITH THE REPAIRING WITH REASON THAT IT FAILS BCOZ OF TRANSIENT EFFECT? SO PLZ EXPLAIN HOW DOES IT HAPPENED?

1 Answers  

I have 2500KVA transformer delta/star,13.8KV/380V provided with LV 4000A breaker. Already I have 2300KW motor feeder with a full load 90%. Is it possible to connect another 1600A from that breaker? If so how the calculation is done?

0 Answers