Answer / rkshjangra

For large power station = 0.5
for small substation = 2.0
for domestic wiring = 5.0

Answer / jayantlande3

It should be less than one ohm.

Answer / p.gupta.1852

Earth resistance should be as small as possible . It
depands on voltage level of the system to be grounded . As
voltage level increases the earth resistance required to be
nearer to zeero as far as possible . Earth resistance
should not exceed 5 ohm for 433V distribution system and
should be below 1 ohm for 66 KV Grid .

Answer / preethi

may be earth resistance value is considered as ideally zero.but it is mostly less than 1 ohm.

Answer / mahesh babu-calicut

the earthing resistance of any electrical system should be
below 5 ohms,unless otherwise specified

Answer / raj kumar

for large power s/s =.5
for small sub s/s =2.0
for domestic = 5.0

Answer / d m chudasama

it depends upon eath compositon. But shoud be normally less then 5 ohms.

Answer / rajkumar.d

There is a good deal of confusion as to what constitutes a
good ground and what the ground resistance value needs to
be. Ideally a ground should be of zero ohms resistance.

There is not one standard ground resistance threshold that
is recognized by all agencies. However, the NFPA and IEEE
have recom- mended a ground resistance value of 5.0 ohms or
less.

The NEC has stated to “Make sure that system impedance to
ground is less than 25 ohms specified in NEC 250.56. In
facilities with sen- sitive equipment it should be 5.0 ohms
or less.”

Answer / dk gnfc

Without grid: <1
With grid:<5

Answer / guest

it should be 0.5 ohms

what is Use of Stones/Gravel in electrical Switch Yard??

4 Answers   Sanghi,

When distance between two pulleys is not fixed, the tension of belt is adjusted by a) driver shaft b) driven shaft c) adjustment screw d) belt

0 Answers   BMRCL,

What does the term power factor shows?

0 Answers  

Why in India distribution transformer are connected in Dyn11 when we know capacity of v-v connection can be increased by adding only a single transformer?

1 Answers   CSPL,

Define ohm’s law for a.c (alternating current)?

0 Answers  

What is disadvanage if power factor goes to in leading..?

0 Answers  

how to calculate kA rating of device?

3 Answers   Siemens, Vijai Electricals,

long form of CT

3 Answers   MSETCL Maharashtra State Electricity Transmission Co Ltd,

Why the TNC switch is called as Memory switch

1 Answers   Reliance,

which is dangerous AC or DC?

10 Answers  

how do i calculate voltage drop-if length is 1000 meter,amps is 160a

1 Answers  

In response to Mr Bikas. If fault current is 52 kA then what will be the CT specification

1 Answers