What is the min.& max distance between two earth spikes is
required for measuring earth resistance of an earth pit? Is
the manufacturer of Earth tester decides this? Pls explain.
Answer Posted / prem devkota
the minimum and maximum distances are 5 and 10 meter in
practice. But in general manufacturer declares the distance
requirement.
Is This Answer Correct ? | 14 Yes | 1 No |
Post New Answer View All Answers
how to determine motor size for a fan application?
In constant power region of 3-phase IM torque-speed characteristics, if frequency increases slip A does not alter B decreases C increases D none of above
can we use trip light with bus coupler?
What is meant by earthhing of a magnetic flow meter and when to use empty pipe detection?
what is quality factor in series resonance circuit and calculate the factor of voltage magnification? how it happens?
WHAT IS MEANT BY TV TERMINAL IN 500MVA TRANSFORMER?
Why the dc voltage drop during starting of emergency lube oil pump? The Voltage drop from 135kv to 125 kv for one min. before re-establish to 135kv?
What is the need of earthing transformer for delta side of a transformer. (Think of a line section between a star/delta transformer at a grid substation and delta/star transformer at a village. An earthing transformer is there at the delta side of the star/delta transformer at grid substation). As there are no ground reference there will not be fault current if a one phase is grounded. Further L-L phase will be sensed by the primary side of star/delta transformer as a L-G fault. So why an earthing transformer is required at delta side
what will happen reduce the transformer voltage from 415v to 406v, is it save the energy,? are this methodis good to reduce the energy.?
What is the armature mmf in a D.C machine?
when 20hp 3 phase motor start no load condition in star or delta connection.find current and write formula.(tariq)
oltc of a transformer, how it works? and what are the equipment consist of describe briefly?
How many types of oil using in H/T & L/T Oil Circuit Breakers. need Explenation ?
IF I KNOW THE AREA OF CROSS SECTION OFTHE WIRE , WATTAGE OF THE LOAD ,VOLTAGE SUPPLY WHAT IM GIVING TO THE LOAD AND ALSO POWER FACTOR OF LOAD ....... SO GIVE ME FOR WHAT AMOUNT OF CURRENT I SHOULD USE WHICH TYPE OF CABLE?
How we can defined theecopper cable size if we know the aluminium cable size?