What is the permissible value of earth resistance!
- 11 Answers
- 34005 Views
- Torrent Power, I also Faced
- E-Mail Answers
Answer Posted / 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 |
Post New Answer View All Answers
number of I/O devices in siemense plc
how i can calculate the size for fire cable
i am gng to visa interview this july i have 4 backlogs gre 1010,toefl 75,pls give me the tips pls pls
how to ctrl motor by use of ac or dc drive.plz explain evdintly
completed BE & done apprentice at tneb & having experience 6 years. want to get c license. will apprentiship & BE be helpful for getting c license. will i get any preference by showing this?
what is the difference between vector scale and vector diagram?
what is the difference between Central Battery System and UPS in applications and uses? and why UPS suitable for Computers and central battery for emergency lighting?
1. Can a 12v DC choke operate a 60v/12w PL lamp ? 2. Can a 230v ballast fire / operate a 60v/12w PL lamps.
What is the type of earth fault protection used in battery? explain.
Will any motor burn if voltage provided is lesser than the rated voltage???? If yes, then how is speed control possible with voltage control
what is allowed value of zero sequence impedancce of 6.6 kv nuetral earthing transformer ?what is the actual value
what about electrical pannel.? What is meant by plc pannel.?
what are the difference between AC lamp and DC lamp
How DC earth leakage currents can be reduced ?
specify the inbuilt protections in DG
