In a Circuit how the MCB and Fuse ratings are calculated.
And shall the fuse follws the MCB or it is otherwise?

Answer Posted / vignesh r

Under no load condition it is 20% of rated current of the
device.And in full load condition it is 120% of rated
current.For eg., consider the rated current of a motor is
19ampere.then under no load it is 20% of 19 =3.8ampere
=5amp(approx).for full load it is 120%of 19 = 22.8ampere=20
ampere(approx).

Is This Answer Correct ?    27 Yes 9 No



Post New Answer       View All Answers


Please Help Members By Posting Answers For Below Questions

Why we use auxillary relay ? what is function of differential relay, directional o/c relay?

1846


What is different between resistance grounding system and resistance earthing system?

837


aternator every parts and its working

1367


how can i determine the KVA/MVA rating of transformer precisely?? is there any standard test?????

2088


Can anybody post questions asked in Engineers India Limited Interview? Thanks in advance.

2104






Why let through energy not considered for ACB breaker while cable sizing?

2097


Why Stabilising Resistor used in REF circuit ?

2927


What is the exact minimum vale of voltage between an earth and netural which can damage or can do malfunction of the electronic equipments ? If this is mentioned in any book, pl.give reference.

2010


what is the setting of locked rotor in HT motor ? (answer expecting in percentage)

2006


hi, i have 3x200KVA and 2 x 80KVA UPS with battery bank of 150AH 68Nos. and 100AH 204Nos., i need to install AC either ductable or PAC type, so can you help me to calculate heat load and capacity of the AC to install.

2511


can u give me a brief idea about power line carrier communication ??

1569


why we used ZNO in Lightning arrester.

1724


Why we use mho Relay in long transmission line?

1185


Why is water motor not taking the pressure? what is the problem?

1327


Readings of ER300P Trivector meter

6079