Answer / balakrishnan

1.We can select the MCB's acoording to Voltage is simple,if
we want 230V,select single pole MCb's else want 415V select
3 pole MCB's.

2.We can select the MCB's according to to Curves is also
simple,there are several types of curvature available..
there are,
B type: react quickly overload i.e 3-4.5 times of full load
current
Type C: react more slowly,these are recommended for
inductive with high inrush currents like fluorescent lamp.5-
10 times of Ifl
Type D: 10-20times of Ifl,recommended for very high inrush
current.
Type K: 8-12 times of full load I,recommended for cable
protection to be provided which include
motors,capacitors,and transformers
Type S: 13-17 times of Ifl,recommended for protection of
control Transformer,

Type Z:

Answer / kundan kumar

MCB rating depends on voltage as well as load, so first of
all we will have an idea about load which will connected to
MCB.

why we are using the ac supply in domestic purpose, why don't use dc supply.

5 Answers  

---

Dear sir, By which formula u can calculate for a particular kv line there is a range of mw.

0 Answers  

---

my UPS suddenly goes off and all panel light also blow off.This happens even main electric supply is not interrupted.After some time it automatically starts functioning normally.Batteries are new.

0 Answers  

---

High voltage test procedure of in swgr board. why should measure millivolt drop on testing time?

0 Answers   NTPC,

---

How much KVAr bank reqired for 630 KVA transformer on full load for maintain power factor upto.99

4 Answers   Dhanalakshmi Industries, DLF,

---

Why design 150Hz in Exciter

1 Answers  

---

On wat basis TSM & PSM are set? Example.TSM=30% n PSM=2.5A....Hw they are set and how we come to know that the particular relay should be set to this value only?

2 Answers  

---

how long will take to burst/damage for a CT when secondary in open condition? Experienced: During switchgear testing(Primary current injection test) some of the CT are in open condition, but nothing happen's why?

1 Answers  

---

america 60hz electric supply is used; but india it is 50hz; why? and if we use 60 hz supply what changeg has to be done or all the equipment has to be thrown which has rating of 50hz frequincy

1 Answers  

---

Dear Brother can u tell the proper size selection of cable & the fault level calculation of braker, busbar etc. pls mail me at azeemk30@gmail.com

0 Answers  

---

As we know diode work on both negative and positive but converting ac into DC we have to given a/c from negative of diode or positive side.please give me answer.

0 Answers   cpgn,

---

Which device of PlC does share load between DG sets when DG are running in perallel?

0 Answers  

---