Answer / 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.

Answer / anil

anil

1.where in India the maximum transmission voltage is operated? 2.what the methods are used to cool down the transformer?give the specific ratings of the transformer & specific cooling process. 3.how zero & negative sequence reactances are formed in a rotating machine when fault occur in the system?

2 Answers   IES,

---

what convarts RRA in alternator ,AC to DC or DC to AC,

1 Answers   Birla,

---

How to Convert horsepower to kva? what is the three phase formula? email me if u know thanks Rehan smileavail@msn.com

3 Answers  

---

how to set time from star to delta starter

2 Answers  

---

difference between semiconductor & conductor & insulator?

0 Answers  

---

How to do the REF Stability test for power transformers in Site?

1 Answers   Escorts, Siemens,

---

what is negative d.c. voltage, why this voltage is used in base transciever station.

0 Answers   Vintage Air,

---

what are the advantages of having high voltage in transmission lines?

5 Answers  

---

What is the main use of rotary phase converter ?

0 Answers  

---

Tell me about yourself. ……………………………………. Why did you leave your last job? What do you see yourself doing five years from now? Ten years from now? What are your long-range career objectives? Why did you choose this career? How well do you work with people? Do you prefer working alone or in teams? How would a good friend describe you? What would your last boss say about your work performance? Why should I hire you? What makes you qualified for this position? What do you think it takes to be successful in a company like ours? In what ways do you think you can make a contribution to our company? What's the most recent book you've read? What two or three accomplishments have given you the most satisfaction? Why? Describe the most rewarding experience of your career thus far…………… Why did you decide to seek a position in this company? What can you tell us about our company? What do you know about our competitors? What two or three things are most important to you in your job? Are you willing to travel for the job?

0 Answers  

---

in the exciter the power is feeded from battry or control or whatever.and we need it in the generators for the stating . do we need it in the shutdown also?i mean the exciter>

2 Answers   Shell,

---

WHAT IS DC COMPONENT IN CIRCUIT BREAKER?

10 Answers  

---