Interested to Buy Any Domain ? << Click Here >> for more details...
Do you know how to measure the earth resistance? if so
explain it
- 42 Answers
- 179696 Views
- ABB, BEL, BridgeStone, College School Exams Tests, Dalkia, Dalmia Group, DEC, Electrical, Genpact, HEC, IOCL, JLL, L&T, MSEB, Saraca, Sical, Telecommunications, University Exams, I also Faced
- E-Mail Answers
Answer Posted / nurul islam mallick
The Fluke 1625 earth ground tester is able to measure earth ground loop resistances for multi grounded systems using only current clamps. With this test method, two clamps are placed around the earth ground rod or the connecting cable and each are connected to the tester. A known voltage is induced by one clamp, and the current is measured using the second clamp. The tester automatically determines the ground loop resistance at this ground rod.
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 recommended 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 sensitive equipment it should be 5.0 ohms or less.”
The Telecommunications industry has often used 5.0 ohms or less as their value for grounding and bonding.
The goal in ground resistance is to achieve the lowest ground resistance value possible that makes sense economically and physically.
| Is This Answer Correct ? | 2 Yes | 0 No |
Post New Answer View All Answers
How vfd saving power.
Comparision of Air break circuit breaker, SF6 Circuit breaker and vacuum circuit breaker.
how ct burden,magnetising current,ratio and knee point voltage are related & derived
why Y CONNECTION IS BETTER INTERMS OF EFFICIENCY AND P.F FOR A LAOD LESS THAN 40% AND WHY AFTER DELTA IS BETTER FOR > 40%
Explain the following and how these are working with PLC Unit 1 I/O Module Card 2 Adaptor Card 3 Ribbon Adaptor 4 I/O bus 5 I/O Devices
If one lamp connects between two phases it will glow or not?
What are dependent sources?
what is excitation/
WHAT IS SHORT CIRCUIT STRENGTH OF 100 AMPS MCCB?
I am about to write exam in RRB bangalore for the post of section engineer.please provide me with previous exam questions
how can we calculate the ratio of caustic soda and water in lrs.
What OPGW is better than Microwave or PLCC???
what is destructive and non-destructive testing of welding
can anyone explain 11kV 3core cable megger,hi pot test procedure with connection details?
what is mean by ideal infinite bus? why it is required to consider in fault short circuit calculations?
