Answer / aamod tripathi

The body earthing conductor sizing is done in india and
internationally by IEEE 80 :2000 standard and IS code 3043

These instruct the different formulae which are to be used
for calculation purpose generally it requires
1. fault current
2. time duration of the fault
3. a factor which is denoted by K and is dependent on the
material used for earthing.Table (1.D)(This takes into
account the ambient and operating temperature of the
material)

In case of a power house where many Transformers and the
switch gears are installed there we have to install
acompletee earthing grid which is like a square or
rectangular net of rods. the number of rods and ground rods.

The most important point in both the powerhouse earthing or
any other kind of earthing we have to keep in mind that the
earthing arrangement should have the resistance less than 1
ohm........ it is an essential conditon that must be
fulfilled.....

why we use capacitor in Fans not resistor?

4 Answers   Vardhman,

---

What is a commutator?

0 Answers  

---

WHAT IS THE DIFFERENCE B/W THREE POINT STARTER AND FOUR POINT STARTER

1 Answers  

---

I want to put this query to SENIOR & EXPERIENCED ELECTRICAL ENGINEERS. 1)I want to know about the control circuit diagrams for control panels. I found it difficult to understand. Is there ant booklet through which we can learn the circuit diagrams? 2)I want to learn about conduiting, laying cables, preparing cable schedules and various techniques which is the part of building infrastucture(construction field). I don't have any experience in this area. I have experience in control panels only. that's why i am not getting any opening in building infrastucture (construction field).Can I get the job in this field as Trainee Engineer? How to enter this field? I need job in PUNE

0 Answers  

---

If we say that an cable of size 3.5X 50 mm sq. can take current upto 140 amps,is it the current of single core of the cable or of all the cores jointly.

3 Answers  

---

Is it required to lay 2 runs of GI wires along with armoured cables from one power DB Machines of higher rating?

0 Answers  

---

what is the mager value of star motor and delta motor between phase to ground and phase to phase, and minimum how much should be value ?

1 Answers  

---

Pl.brief me any electrical major fault you have rectified.

0 Answers  

---

What are the point of a single core cable to be earthed?

2 Answers   Alfanar, Jindal,

---

Why corona leads to production of Ozone and glow of the color VOILET?

0 Answers  

---

what will happen to give a dc supply in transformers?

3 Answers  

---

Why is reating of t/f in kva but for inverter in kw ?

3 Answers   UPPCL,

---