Answer / naresh kumar dhal

making capacity=2.55*symmetrical breaking capacity

Always ckt breakers are rated in its symmetrical breaking
capacity.It is the rms value of fault current that a ckt
breaker can handle for short duration of time,which is
called short time rating.
If breaker is rated 10 mva,then its symmetrical breaking
capacity is 10mva.i.e root3*v*I*10-6=10mva,from this u
calculate current.Which is the symmetrical breaking current

Answer / pillay

making capacity of a circuit breaker means when you switch
on the breaker the breaker can operate safely or withstand
upto the stated amount.

The same applys to breaking capacity of a breaker which
means when it switches off it can withstand up to the stated
amount at the time of offing. The unit used is usually KVA
or MVA.
Some breakers can have a high breaking capacity but a low
making capacity. This means when switching on it should not
be loaded but can be switched OFF with a high load.

Answer / vs

ans 1 is absolutely wrong .ans -2 is right .making capacity
is always higher than breaking capacity .

what is consequences of neutral and earth connect?

0 Answers  

---

can we measure +,-.zero sequence current ....? if so how can ???

2 Answers   NLC,

---

how we can know the rating of transmission line by no. of insulators disk ??????????

3 Answers   NTPC,

---

We store the d.c supply...then why can't we store A.c supply???

4 Answers  

---

about your self?

4 Answers   Hyundai, US Technology,

---

do anyone out there know where to find a compleete list on acronyms/abbreviations used in offshore electric engineering. MCB - Micro Circuit Breaker, MCCB-Mouldes Case Circuit Breaker, ELCB-Earth Lekage Circuit Breaker, ELMCB- etc.....

0 Answers   Aibel,

---

how the global warming take place?

1 Answers  

---

How to calculate transformer capacity requirement for a project site?

5 Answers   ABB,

---

In a three phase transformer(delta/star connected)when i touch one end of the bulb in any one phase and other end to earth..will the bulb glow or not..if not why?..i'm touching the bulb in star connected side...

6 Answers  

---

salam, hi, how to calculate british temperature unit (B.T.U)?

1 Answers  

---

What is the fusing factor ?

4 Answers   MESCOM Mangalore Electricity Supply Company Limited,

---

Can u tell me the name of books of transformer testing?

6 Answers  

---