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

WHAT ARE THE DATAS REQUIRED FOR PROTECTION AND METERING AND CONTROL AND LOGIC PREPARATION,HOW TO STUDY THE PROTECTION AND METERING?

0 Answers   L&T,

---

testing ZNYn11(d) vector group transformer

1 Answers  

---

why transformer measures in kva

4 Answers  

---

Design and explain a circuit to produce an unregulated full wave D.C supply.

1 Answers  

---

Is it true online ups having bypass mode if it is true then why we called ups because it is interrupting power when goes in bypass mode

0 Answers  

---

---

DG Earth Value?

0 Answers   Reckitt Benckiser, Vodafone,

---

How i can identify the 220V and 110V power supply equipment? No tag number.

4 Answers  

---

How to Calculate Stc Rating of an indoor type VCB Panel? What is a full form of STC?

1 Answers   ABB,

---

why dc did not flows to earth?

2 Answers  

---

What are the safeties in elevators?what is the use of governor in elevator?

3 Answers   JLL,

---

hi I have done 3 yrs diploma in electrical engg after 10+2. I have 16 years of work experience into design proposals sales and engg application development in LV/MV swithcgear and sub station automation field. I want to apply for immigration to new zealand but I am not sure whether I qualify or not since I dont have a degree. Can anyone advice? Thanks Riz

0 Answers  

---

why transformer not work in dc

16 Answers  

---