Answer / nidal rafeeque

Specifically, these curves denotes the instantenous
tripping current, if fault current crosses the designated
mark.

B : 2-5 times the rated current.
C: 5-10 " " " "
D : 10-15 " " " "


C- curves type are used for heavy currents in normal
working.(e.g. Heaters, Gyesers, Irons)

D-curves types are used for heavy inrush currents.(Motors
etc)

Answer / antu paul

B,C,D Curves are characterised with instantaneous trimping
current and is as below
for B curve-above3*In-upto and include 5In
for C curve-above5In upto and include10In
for D curve-above 10In upto and include 20In
for Z curve 8In-12In for inductive loads
K curve for semiconducting devices

where In is the rated current of MCB.

Answer / raja

These curves denotes the instantaneous value of current

C curve is 5-10 times of rated current and D curve is 10-15
times of rated current.D is normally used with motor.

If increased the frequency up to 1000 then what changes shows in voltage?

0 Answers  

---

How to select earthing strip for 100kw induction motor ?

2 Answers  

---

how many ampere Maxmium load given on a 10 kva DG set?

3 Answers  

---

All tape of electrical questions Answers tape of motor transformer e.o.t crane

0 Answers   Afcons, Honeywell, Manlift, SIMS,

---

what are the necessary basic electrical topics to learn for mechanical engineer to deal practical problems.

0 Answers   Honda,

---

PLZ EXPLAIN CORONA,SKIN,BIRD PALE,SPAN,SAG Effects of power cable.

0 Answers  

---

why is neccessary Tap changing of power transformer with in a certain time

1 Answers  

---

what is the solution for meger test failed the MV cable?

1 Answers  

---

what is the calculation of power factor?

4 Answers   GATE,

---

we erected (48HP)63kva dist transformer and incoming from 11kv line,out going is 415v domastic line 2.04 km.for that actual output current is 84A. what are the losses and final output current.

3 Answers   Essar,

---

WHAT IS VFD,FUNCTION, PURPOSE,

2 Answers   RasGas,

---

What is the difference in calculating size of AC cables compared to calculating size of DC Cables? Usually DC Cables are larger than AC Cables although they have the same ampacity. Why is it?

0 Answers  

---