how to check the earth resistance value& what is the
minimum earth resistance for good earthing sysytem.
Answers were Sorted based on User's Feedback
Answer / jaydeep parmar
value of the earth pit should be less then 2 ohm and earth grid value should be <1 ohm
| Is This Answer Correct ? | 428 Yes | 59 No |
Answer / tauseef tarique, engineer(e)
The earth resistance value can be checked by the use of
earth resistance tester (called megger earth tester). The
best earth resistance should be less than one ohm but the
permissible value is less than 5 ohm. For rocky areas it
should be less than 8 ohms.
| Is This Answer Correct ? | 318 Yes | 43 No |
Answer / pandiyarajan
Grid resistance value should be lessthan 1 ohm
| Is This Answer Correct ? | 209 Yes | 31 No |
Answer / aruna devi
By using earth megger .It should be less than 2ohm.
| Is This Answer Correct ? | 227 Yes | 72 No |
Answer / bhavini
earth tester use for measuring resistance of earth pit
should be less than 1 ohm.
| Is This Answer Correct ? | 105 Yes | 26 No |
As such there is no any standard of earth resistance value,
Its varies on different type of soil resistivity. Idley it
should be 0, but in different kinds of soil for electrical
equipment it should be better to below 10 Ohms and for
electronic equipment it should be better to below 5 ohms.
| Is This Answer Correct ? | 100 Yes | 28 No |
Answer / ramaraj.g
The earth resistance value can be checked by the use of
earth resistance tester (called megger earth tester). The
best earth resistance should be less than one ohm but the
permissible value is less than 5 ohm. For rocky areas it
should be less than 5 ohms.
we using the DMM in check the L - N , N- E ,E- L
this small calc
L-N - 230 v
N-E - BELLOW THE 2 VOLTS IS GOOD ERATH CONN
E-L - 230v IS RECONFORM TO GOOD EARTH OR NOT
L-N = E-L
| Is This Answer Correct ? | 77 Yes | 11 No |
Answer / bk sharma
It should be near <0.5 ohm for good earthing.
| Is This Answer Correct ? | 64 Yes | 11 No |
Answer / bhanu
earth testers are used. and it is checked wheathe earh
resistance range is from 1-2 ohm or not.
| Is This Answer Correct ? | 83 Yes | 39 No |
1. What is differential relay? How it operates? 2.How to calculate the Short Circuit Impedance in Transformer? 3.What is the alternate solution for testing of polarity by using polarity tester while its milli ammeter does not works? 4. While testing the 33KV Busbar by using Hipot kit, what should be the test voltage we have to apply? 5. What is the procedure/activities to be taken to inject the current more than 2000A by using 2000A Loading Transformer? 6. Explain how you can give the overload setting to any Motor Protection Relay for a HT motors with formula and example? 7. Why restricted earth fault protection is needed? Why can’t differential Protection is sufficient? 8. What should be the minimum and maximum ohmic value for earthing? 9. Why DC Currents are not used in transformer? 10. What is the Frequency while we step up the voltage from 220V to 11KV? Is it possible? Explain it?
difference between ac and dc generators
Why earthing done?
How capacitor improves pf
why we use copper earthing for neutral while for body GI.
1 Answers Chennai Metro Rail Limited CMRL, Valeo Lighting Systems India Private Limited,
For 160kw motor what size of cable and material is needed.?
Explain about Leakage Test.
can we use ELCB and RCBO in one db
what happen when transformer connect on dc supply.
If two Transformers are connected in parallel having impedance of 50KA in both transformers will the impedance increase or decrease after connecting transformers in parallel?
While HT line put on to activate ACB in low tention panel VCB tripping instantly.why it happens
What voltage is used in Directional earth fault relay? and why?
Civil Engineering (5086)
Mechanical Engineering (4456)
Electrical Engineering (16639)
Electronics Communications (3918)
Chemical Engineering (1095)
Aeronautical Engineering (239)
Bio Engineering (96)
Metallurgy (361)
Industrial Engineering (259)
Instrumentation (3014)
Automobile Engineering (332)
Mechatronics Engineering (97)
Marine Engineering (124)
Power Plant Engineering (172)
Textile Engineering (575)
Production Engineering (25)
Satellite Systems Engineering (106)
Engineering AllOther (1379)