Answers were Sorted based on User's Feedback
Answer / anand
bwlow 1 ohm
|Is This Answer Correct ?||35 Yes||7 No|
Answer / anilram
for perfect earting it should be zero ohms. for pratically
at site it 1-5 ohms . in large substations the should be
below one ohm
|Is This Answer Correct ?||22 Yes||3 No|
Answer / seth roosevelt dabri
it is between o - 0.5 ohms in large substations the should be
below one ohm
|Is This Answer Correct ?||10 Yes||2 No|
Answer / sreenu
IT'S ABOUT THE RANGE LIKE 0.7 TO 0.8 . DUE TO COMPONENTS
PRESENT IN EARTH.
|Is This Answer Correct ?||16 Yes||10 No|
Answer / jan
No fixed rule. depends upon site. better keep it as low as
possible else high touch/step voltage
|Is This Answer Correct ?||6 Yes||2 No|
Answer / syed qamar abbas
The ideal value of earth resistance allowed is 1 ohm or less
for equipment's body earthing or grounding like generator,
Main distribution boards , motors etc. On other hand the
value of earth resistance allowed for lightning protection
system is 10 ohms (ideal)
|Is This Answer Correct ?||8 Yes||5 No|
Answer / bilal descon
1 ohm is ideal, but thats depend from place to place.
Near desert ares its more up to 20 ohm, but normally
betweem 0 to 25 ohm is acceptable
|Is This Answer Correct ?||10 Yes||8 No|
Answer / sethu
perfect earth value - 1.5 ohm
lighting arrest earth value - 1.7 ohm
|Is This Answer Correct ?||2 Yes||1 No|
Answer / anubhav gupta
Resistance of earth should be zero but it can't possible. however, according to NFPA &IEEE the resistance of earth is 5 our less
|Is This Answer Correct ?||1 Yes||0 No|
1.what is meaing of ups,and used in softwares and sud stations,and main partes in ups. 2.main partes of the Disel Genarator. 3.main partes of the chiller and safty equipments.
1))why we run three phase or three different circuit from a single conduit 2)) why not two circuit of different phase run in same conduit?? and why we run same three cicuit of same phae run in single conduit??
Incoming line 11kv And transformer capacity is 2500kva. Consumption load is 1300A. Then fuse capacity is 11kv line.
Explain the term parallel path in dc machin ?
We have AC-transformer 110/13.8kv,40MVA.If DC-Voltage=110kv is applied in its primary what will happen?
why power generate in 33 kv it will be step down by 11 kv .
why some transformer without breather.
On what basis no of earth pits are to be decided either for transformers or for equipment?
WHAT IS THE USE OF EARTH SWITCHES?
I AM COMPLETED DIPLOMA IN E.E.E. AS WELL AS B.TECH IN ANDHARPRADESH.. HOW I THE Certificate of competency as Electrical Supervisor.
HOW MUCH CURRENT DOES SYNCHRONOUS MOTOR TAKES AT SYNCHRONOUS SPEED IN NO LOAD CONDITION ?
what is phase voltage phase current line current and their usage? provide diagram