Answer / john henry

Making capacity is the MAX current that a CB can pass at
the occurence of fault.
And breaking capacity is the RMS value of current at which
CB can break its contacts open.
Now when fault occurs, system goes into the subtransient
state and a huge amount of current flows in the system.
and this time if the breaker is reclosing and the making
capacity is low it will burn so it is high.
Breaking is low so that it can be isolted from the system
as soon as the fault occurs with less arching and to save
the contacts of the breaker.

Answer / gunasekaran

breaking current is always rms value making current are peak
current. because at the fault condition breaker will be re
closing at sub transient condition. at subtransient
condition current is more so the designed making current
value is less it will burn. so making current always more
than breaking current. it is about 2.5 times of breaking
current.

Answer / aqeel

Making current implies dc component so it is 2.5 times
breaking current

Answer / palani

The CB breaking current is less than Making current. The
breaking occur at the zero of the alternating Current where
as making occur at any amplitude of current in the
alternating current .

Answer / sudar

Which one more save opening CB at capasitive or inductive
condition???

Answer / sagar hingmire

Bcoz If making current capacity is not greater than
breaking current then if fault is there on electrical
system & ur going to close CB then very high fault current
will flow through CB and CB will get damaged or blast as
fault is not cleared.

why the transformer primary terminal indicated by u,v,w.to technical reason

2 Answers   JNTUK,

can a synchronous motor be made to rotate in a clockwise direction ?

1 Answers  

what type of motor used to move a 1 ton gate? and relate ratings with load.

0 Answers   Khidmah,

what is the difference between isolation and insolation ? please explain in detail with example.

5 Answers   ABB,

What are the function of different components of servo motor?

0 Answers   BARC, Parle,

WHATIS TIME CONSTANT? WHATIS ITS SIGNIFICANCE? ILLUSTRATE THROUGH EXAMLES.

0 Answers  

If a motor of 8.5 KW with same load and using in both Star & Delta one by one,then which will take more current in star connected or in delta connected

4 Answers  

how to make neutral to ground voltage less than 5v? my house is under the high voltage transmission line so,proper grounding using rod salt n coal doesnt help me..so wat i do as i cant operate my computer ..this high voltage cause great problem to the motherboard i already two times replaced it.in my house voltage is coming near to 25 v between ground and neutral.plz kindly post ur answer to my email id manish77777@gmail.com ..

3 Answers  

what is numerical relay explain its operation

2 Answers   ABB,

How to select batteries required for ups and the inverter if we Known load? And how AH is selected of battery?

0 Answers   Vodafone,

What is the role of power pack in substation protection system?

0 Answers   Facor,

How to calculate the Sizes of the cable required for one specific load? Is there any formula for that? ( EX: For 400KW load,50mtr Length, What is the LT cable Size required?)

2 Answers   Texmo,