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Question
how we can select MCB ratings according to Voltages, Curves.
 Question Submitted By :: Electrical-Engineering
I also faced this Question!!     Answer Posted By  
 
Answer
# 1
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:

 
Is This Answer Correct ?    31 Yes 2 No
Balakrishnan
 
Answer
# 2
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.
 
Is This Answer Correct ?    9 Yes 2 No
Kundan Kumar
 
 
 

 
 
 
Other Electrical Engineering Interview Questions
 
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why we define potections of Tourbo generator in Class A & B. GIL 1
what should be the air clearence between phase to phase, phase to earth in Medium voltage switchgear for 3.3kv,6.6kv,11kv,22kv and 33kv? Which is to be referred for this? Sanmar 1
What is mean by powerfactor. What is the difference between leading and lagging power factor? HCL 2
A circuit breaker is a   7
can any one help me? 1.what is corona extinction voltage&corona inception volatage 2.what is mean by CFVV? Kseb 1
what you mean by current? what you mean by voltage? what is difference between star and delta connection in motor side? Adani 2
WHAT IS MEANT BY LOCKING OF ROTOR IN SYNCRONOUS MOTOR? EXPLAIN ME LOCKING IN DETAIL?   2
What is the min.& max distance between two earth spikes is required for measuring earth resistance of an earth pit? Is the manufacturer of Earth tester decides this? Pls explain. HAL 2
why synchronous motor has zero starting ? NTPC 7
why the earth conductor in top of the tranmission line ?   2
How the oil level of the Buchholz Relay come down.   3
What is the direction of rotation of blades in a table fan and in a ceiling fan ? Power-Grid 11
 
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