Answer / kalpesh

the earth resistance can be checked by using earth tester
04 spike method.

as far as minimum earth resistance value is concern, it
depends on teh type of gazet connected to this earth pit.
however the resistance should be as low s possible

Answer / g umamaheshwar rao

earth resistance of individual earth pit should be less
than 5ohms and when it is connected with grid should be
less than 1 ohms

Answer / guru

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

Answer / robeesh

Earth Resistance test to be conducted on summer conditions to achieve the correct value by using an earth resistance tester (From Megger/ Sanwa/ Fluke). The value should be less than 1 Ohm for electrical earth pits and less than 10 Ohm for Lightning protection System. Procedure for testing should be as per the equipment.

Answer / nasir sharif

The earth resistance value can be checked by the use of
earth resistance tester (called megger earth tester). The
best earth resistance should be less than one ohm & ideally resistance is Zero ohm but the
permissible value is less than 5 ohm

Answer / stephen

depends on the supply system

Answer / chanchal tiwari

the earth resistance should be less than 1 ohm. if we using
digital earth resistor, then one common method used as
three terminal type and the distance between these three
terminal should be 20 to 30 meters.

Answer / yashvardhan anand

The Earth resistance

Answer / prince

Switch on the multimeter, and using the dial on the front, select the resistance function. The multimeter will have two probes with metallic pointed ends. Place the probes on either side of the earth wire. The display on the multimeter should show a low resistance of approximately 0.5 Ohms. If the resistance is significantly higher than this, the wire is faulty and needs to be replaced.

Answer / malik

by using mager we can find the value of earth resistance.
there are three types of resistance
1}low resistance
2)medium resistance
3)high resistance

earth resistance comes in LOW RESISTANCE it should be blow
then 1ohm.

What is Isolation Current transformer and what purpose to use it in REF relay ?

1 Answers  

SUPPOSE A CIRCUIT BREAKER HAS TRIPPED THE THE LINE WHEN A FAULT OCCUR ON IT.NOW WHEN THE FAULT HAS BEEN CLEARED, HOW THE CIRCUIT BREAKER WILL CLOSE AUTOMATICALLY NOT MANUALLY.

6 Answers   Bureau of Energy Efficiency, DVC,

why fan consume constant power even when we increase or decrease its circuit resistance through speed regulator???

2 Answers  

whate is the meaning of balance/unbalance,in stabilizers type

0 Answers   TCS,

what is the meaning of 0.5ohm Resistance

0 Answers   Vardhman,

for a 5hp motor to operate from 100kva generator ,what size of cable required in sqmm.

2 Answers   DSC, Indraprastha Gas Limited IGL, UltraTech,

Any link for Electrical objective type questions ?

0 Answers  

what is bus coupler, where it used.

14 Answers   Diebold,

what is cogging? how it can be controlled?

1 Answers   HCL,

what is the power factor used by the PHCN in nigeria? 2. what is the difference between an alternator and generator. 3. Generation of poweris in KV but how is transmission is in MW. 4.If the transmission of power is 20,000MW how can it be increaesed to 80,000MW

0 Answers  

Difference between UPS and Inverter?

7 Answers   HCL,

What is mean by voltage & current.

12 Answers