why farmers are use earthing instead of neutral for their light conec. at
field.is it safe
Answer Posted / rk
As there is a vast difference between the Earth & Neutral
The ground or "earth" wire is a circuit's safety protective
wire that normally carries no current.
It is there to force a fuse to blow or a circuit breaker or
GFCI to trip if a fault condition occurs in any appliances,
their flexible cords or plugs that are connected into the
circuit.
By carrying away the excess current in a fault condition -
which should cause the protecting fuse to blow or circuit
breaker to trip - the "ground" or "earth" wire protects the
building and its occupants because the power should be cut
off before anyone gets electrocuted or any overloaded
circuit wiring or appliances catch on fire.
The neutral is the normal "return" wire: in systems where
the load is supplied from only one hot (or "live") wire, the
neutral completes the circuit and carries current back from
the load to the power station.
All the neutral and ground (or "earth") wires in a building
are tied or linked together at the incoming service main
breaker panel. This is the only place they should ever be
tied together because it is "upstream" of all the fuses
and/or circuit breakers protecting the hot (or "live") wires
for the various circuits installed in the building.
Warning: we must never assume that a neutral is safe to
touch: it has to be checked with a voltmeter or a voltage
indicator to be sure it is not "live". This is because a
neutral wire is designed to carry current under normal
circumstances.
So, if a neutral wire going back to the incoming main
breaker panel has not been properly connected - or suffers a
deliberate disconnection or some accidental damage which
causes it to break - then it and any neutral wires connected
to it further downstream will go live up to the break
because of being connected to the downstream loads which
still have hot feeds coming into them!
That is why we should never use a neutral as a substitute
for a proper, separate, ground or "earth" wire.
Is This Answer Correct ? | 2 Yes | 1 No |
Post New Answer View All Answers
i need previous entrence exam papers of nhpc.
why do we measure VIBRATION in -24vdc and why we adjust gap voltage -9vdc to 10-vdc? i am trying to get this information since 5 years, yet i haven't get reliable answer, i hope i can get from you.
how to find Harmonics and types as per the equipemnts
How we can determine short circuiting current any plant and for example a plant which power generation is 415 volts and plant load is 500 kw.
How to calculate the volumetric capacity of a oxygen & Nitrogen gas Cylinder if pressure is 145 kg/cm2 & water capacity of cylinder is 67 liters.
oil cooled transformer
how does a liquid starter reduce the starting currents?
hii this is ranjith from hyd... i want to know what type of questions they ask in interview...and hw the interview will go..? what subjects thay ask specially for electrical engg students?
what is differant beetween overload current and phase current?
to vary valtage from 0 - max a variac is necessary . so how to design for high power applications nearly about 200KW power
which one is more efficient, torq, power & ecnomy with the same frame size AC motor / DC motor?
is there any current and voltage drop on liquid resistance starter water/soda tank ?
WHaT IS THE CONCEPT OF INDUCTION LAMPS IN MODERN LIGHTINGS, and HOW IT WORKS TO EMIT LIGHT ( AS NO ELECTRODES ARE PRESENT ) ?" COULD INDUCTION LAMPS CAUSE INTERFERENCE WITH COMUNICATIONS INTO A STORE USING INDUCTION LIGHTING ? WHAT IS THE BENEFIT OF USING THE LOW FREQENCY INDUCTION LAMP , VERSUS LED , AND VERSUS FLUORESCENT, AND VERSUS ANOTHER KIND OF LIGHTING . THANK yOU MOISES GUINDI
What is the most important precaution in any experiment with d.c. Shunt motor?
What is an Air COmpressor