How to select Main CB Rating for 220 KW Load?

Question Posted / nana

3 Answers
7908 Views
Voltech, I also Faced
E-Mail Answers

Answers were Sorted based on User's Feedback

How to select Main CB Rating for 220 KW Load?..

before the selection,first we should know that it is single
phase or three phase load.in case 1-phase we use p=vicosф to
find out the load current but in 3-phase we use p=√3vicosф.
suppose it's 3-phase then load current=382amp.now add
minimum 25% safety factor to it.then it will be 475amp ,so
we can select C.B of 500amp current rating.

Is This Answer Correct ?

7 Yes

1 No

How to select Main CB Rating for 220 KW Load?..

Answer / velusamy

Select based upon current rating
next 220kw using voltage

For Ex:
220kw
415v
means it will take arround 350 Amps so we can select the CB

more than the current with withstand capacity

Is This Answer Correct ?

8 Yes

6 No

How to select Main CB Rating for 220 KW Load?..

Answer / sennapparajan

for 220kw load curent is 380 amps. so your breaker should
be min 1.5 times of full load current. so u can select 630A
breaker.

Is This Answer Correct ?

5 Yes

3 No

Post New Answer

More Electrical Engineering Interview Questions

In Megger which types of test we can do ? and How it works? How to use?

3 Answers Power Grid,

what is over frequency protection

1 Answers

What are the components ofan HT panel in a 11kv power station?

2 Answers Reliance,

please explain power factor in simple words.....

3 Answers

what is the difference between arc and spark

2 Answers ABB, Jindal,

Why should The rating of 11 kV DO Fuse is in mulyiple of hundred(200 Amp. 40 Amp, etc) Ampere wheareses the its fuse elemnt has rating in just few Amp (< 12 Amp)? ( Is it jusy beacuse of factor of safty).

1 Answers

What is the operating range of voltage and current in grid supply in India?

4 Answers BARC,

Dear sir, we are getting voltage fluctuations suddenly for 2 or 3 minutes again it becomes normal. we checked each and every connection some times we are getting 110 volts like that from earth to neutral again it is reducing we are getting supply from 45 kva DG set give earthing properly.

3 Answers Triveni,

Can anyone explain me about the capacitor calculation

0 Answers

How will calculate the current rating (withstanding capacity)of alumunium and copper cables?

1 Answers

What is meant by coupling capacitor?

0 Answers

Why do not we prefer non conventional sources of energy to conventional sources?

0 Answers Nabard,

For more Electrical Engineering Interview Questions Click Here