What is the permissible value of earth resistance!
Answers were Sorted based on User's Feedback
Answer / rkshjangra
For large power station = 0.5
for small substation = 2.0
for domestic wiring = 5.0
Is This Answer Correct ? | 36 Yes | 4 No |
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 .
Is This Answer Correct ? | 26 Yes | 4 No |
Answer / mahesh babu-calicut
the earthing resistance of any electrical system should be
below 5 ohms,unless otherwise specified
Is This Answer Correct ? | 9 Yes | 5 No |
Answer / raj kumar
for large power s/s =.5
for small sub s/s =2.0
for domestic = 5.0
Is This Answer Correct ? | 9 Yes | 5 No |
Answer / d m chudasama
it depends upon eath compositon. But shoud be normally less then 5 ohms.
Is This Answer Correct ? | 1 Yes | 0 No |
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.”
Is This Answer Correct ? | 0 Yes | 0 No |
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