How to select Main CB Rating for 187 KW Load?

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Question Posted / shahul

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How to select Main CB Rating for 187 KW Load?..

Answer / abdulsubur

Total load =187kw

p=root3*vicosphi
i=p/root3v*cosphi
we get aprorximately 400

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11 Yes

0 No

How to select Main CB Rating for 187 KW Load?..

Answer / abdulsubur

we get appoximately

cb= 400A

Is This Answer Correct ?

4 Yes

1 No

How to select Main CB Rating for 187 KW Load?..

Answer / ramaraj.g

Selecting main CB rating first.
187KW / votages LL
187000/400
467.5 amps this type current rating is not in market
so we will go to next rating 600 Amps

Is This Answer Correct ?

5 Yes

2 No

How to select Main CB Rating for 187 KW Load?..

Answer / abdulsubur

P= Root3*vicosphi

calculate i from this equation apploximately
we can use 400A ircuit Breaker

Is This Answer Correct ?

3 Yes

0 No

How to select Main CB Rating for 187 KW Load?..

Answer / rajendran

Apart from the nominal operating current we have to
consider the following factors also

1) Capacity of the source
2) Fault lvel of the system
3) Breaaking capacity of the breakeer required based on the
fault level obtained..
4) Space avilable
5) cost requirements
6) Method of controls in the breaker
7) Protection facilties avilable....

Is This Answer Correct ?

3 Yes

1 No

How to select Main CB Rating for 187 KW Load?..

Answer / bala

Selecting main cb rating depends on the type of load if it
is combination of small loads (upto 10kw) 400amps mccb is
enough.
1. if it is one motor load. first we have consider what
type of starter we are going to use. in case of star delta
starter select 600amps mccb. in case of VFD and softstarter
400amps mccb is enough.

Is This Answer Correct ?

4 Yes

3 No

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