how to check the earth resistance value& what is the
minimum earth resistance for good earthing sysytem.
Answer Posted / 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 |
Post New Answer View All Answers
how to produsing geretor power
What happens when ac supply is given as excitation voltage instead of dc supply
How will change the frequency in distribution side?
How harmonic block test are conducted on relays ( Siemens,Areva ect )power transformer using omicron kit?
What was your role in the silicon evaluation/product ramp? What tools did you use?
54 Comments Alok and Bhanu play the following min-max game. Given the expression N = 38 + X*(Y – Z) where X, Y and Z are variables representing single digits (0 to 9), Alok would like to maximize N while Bhanu would like to minimize it. Towards this end, Alok chooses a single digit number and Bhanu substitutes this for a variable of her choice (X, Y or Z). Alok then chooses the next value and Bhanu, the variable to substitute the value. Finally Alok proposes the value for the remaining variable. Assuming both play to their optimal strategies, the value of N at the end of the game would be?
What is the basis for selecting Vk/2 or Vk/4 for REF and Differential protection of Transformer and What is the significance of magnetising current
What is gain margin?
Why Water motor is not taking a load or pressure while everything is correct. (Note: Motor running properly)
technically, what is the reason behind starting the motor star the delta connection .. and what other ways to do this rather than using " star-delta transformer"
why to use freewheeling diode ( diode in revers bias mode) across dc coil
what is kvarh? Please define it With calculation General motors ?
can u please mail me the syllabus for GET exam for damodar valley corporation?
A commercial Building is designed with 14th floor levels with indoor substation of three phase transformer with rated capacity of 1000 Kva.The transformer delivered 65% of its rated capacity at 0.67 power factor lagging.Because of low power factor, the power customer was penalized and certain cost was charged accordingly based on every point percentage lower than 85%.This situation may repeatedly happen on the succeding energy bills of power customer.The power customer is desired to improve its historical power factor of 0.67 lagging and no further penalty be impose by the local power company on the next bill. Q: Identify the appropriate solution you want to offer to Client?.Justify SCIENTIFICALLY and MATHEMATICALLY the principles behind the solution.
is it true there's a big difference in using Cummins or Denyo...especially power output or leakage