What is the normal earth resistance?
Answers were Sorted based on User's Feedback
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 |
define reluctance motor & its operation ?whether its operating single phase or three phase ?
1.How to calculate backup time from series connected battery of 12v dc with 26Ah for 2battery?
WhY PF low at Time of PT Missing in HT Meter
how i sync. the different size of generator.
What is Skin effect in Cable?
1.generator rated as 1000 mva,11kv .8 pf what will 0.8 pf will indicate? 1.max pf it can supply 2.min pf it can supply like this 4 options there what is answer.explain
What is the make of breakers, transformers, generators? What are their capacities and ratings?
draw the restricted earth fault protection circuit install on power transformer and identify its parameters and draw C/C curve of it
we have require a Motor (1500kW, 6.6kV, 50Hz) which shall operate at 1500rpm during 30min and after it shall run on 500rpm during 15min. The same cycle shall be repetitive during the whole working days. Which method is best and economic to achieve such type of task. VFD, VVFD, Pole changing motor etc.
If the rank of a (5x6)matrix Q is 4, then which one of the following statements is correct ?
why does make gain margin and phase margin on same plot.?
wat is the need of capacitor on aceiling fan?