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Question
What is min and max voltage between earth and neutral/phase
if it perfect earthing?
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
If it is perfectly earthed then there is no voltage
diffance between earth & neutral that means it will be Zero
in all condition.
 
Is This Answer Correct ?    232 Yes 85 No
Shipra
 
Answer
# 2
voltage bw earth and nuetral is 100 to 200 milli volts if
it is perfect earthing

voltage b/w phase and earth is 230 volt for all phases


voltage b/w phase and neutral is varied from 220 to 230 v
it depends up on the phase balance conditions
 
Is This Answer Correct ?    137 Yes 26 No
Suresh
 
 
 
Answer
# 3
The Max and Minimum voltage between neutral - earth,
depands on type of earthing :-

if it is dedicated earthing and it is maintained properly,
the voltage between earth and neutral shall be 0 volt.

If it is a joint earth it may go to 1 to 2 volt.
 
Is This Answer Correct ?    72 Yes 6 No
Vinod Kumar
 
Answer
# 4
Every electrical installations has earthings If it has
single earthing without joints

Neutral-earth-0 volts

with joints

Neutral-Earth= + or - 5volts

between phase-neutral
Phase-Earth=230volts

As per IEC,IEEE max voltage drop allowed in electrical any
installations should be below 2.5% of rated system voltage
 
Is This Answer Correct ?    50 Yes 8 No
Mohammed Arshad
 
Answer
# 5
generally the max. difference between voltage of neutral and
earth to be maintained is 3.5V.If it gets
crossed,circulating currents flow and equipment connected
gates damaged
 
Is This Answer Correct ?    50 Yes 12 No
Saikrishna
 
Answer
# 6
In balanced condition the voltage between neutral and earth
is zero,if perfectly earthed.

There will develop voltage between neutral and earth in
propotianate with unbalanced condition.
 
Is This Answer Correct ?    54 Yes 18 No
Sajad Sharafudeen
 
Answer
# 7
This will depend on the earthing arrangment
plz check IEC 60364-5-54 Electrical installations of
buildings - Selection and erection of electrical equipment -
Earthing arrangements
 
Is This Answer Correct ?    66 Yes 35 No
M.mousa
 
Answer
# 8
Correct voltages are....

Pahse to Neutral 230
Neutral to erarthing 0
Earthing to phase 230

All other answers are wrong
 
Is This Answer Correct ?    68 Yes 46 No
Ajit Dalvi
 
Answer
# 9
The question can be replied in three conditions
When earthing is perfect and (a) neutral is solidly
earthed at transformer end then the volatge between erath &
neutral is zero and earth and phase is the same as between
earth & neutral in all conditions whether all pahases are
perfect or one of them faulty. and between earth and phase
is the same as neutral and earth i.e. nominal value when
system is healthy
(b) when neutral earthing is not solid but with resistance
then Voltage between neutral and earth will be zero in case
of balanced load on all three phases and it may rise max.
upto a value equal to phase value if there is fault on one
of the phase,depending upon the value of earthing
resistance of the neutral earthing. Value of earth to phase
will be nominal value if system is balanced and healthy,
and may go max upto phase to phase voltage if there is
fault on one of the phases and mind it again value in case
fault will depend on fault resistance.

In nut cell we can say that min. value between neutral and
earth will be zero volt and max. will be nominal voltage
(e.g 230 volt in indian LT supply case) and voltage between
neutral and phase will be nominal voltage is system is
balanced and healthy and mind it in case of fault it may go
down min. to zero value and max to phase to phase voltage!
and that is what great abt electrical enineering.
 
Is This Answer Correct ?    33 Yes 15 No
Ravindra Sharma
 
Answer
# 10
Regarding answer 11, i think in case the Neutral to Earth
voltage is high, it means there is an unbalanced load in
the three phases (in case of 3 phase supply) or the neutral
is not proper. Either way, there is a chance of current
flowing back into the circuit because of improper neutral
or earth not properly grounded, resulting in equipment burn-
outs in case of a surge. These equipments need not be
switched on and will burn-out in case of fault. Thus it is
recommended to keep the voltage between Neutral and earth
as low as possible.
 
Is This Answer Correct ?    15 Yes 0 No
Pradeep
 

 
 
 
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