why mccb is not tripping when phase & neutral terminal are interched ?

4 Answers  

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how to select the cables based on amps ratings ? how to calculate the amps and how to select the cable size

1 Answers   JV Electricals,

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How to make vector group test of transformer?

2 Answers  

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what is the function of cooling tubes in transformer

4 Answers  

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what happens when parallel resonance occurs?

2 Answers  

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We have 800KW motor operating at 6600Volt,50 Hz supply.During 1st startup it tripped on overcurrent trip.It's FLA is 88 Amps.The K factor of Thermal overloaaad was set on .94 initially.then we set at 0.97 and then it started fine.i dont understand why it tripped first?What are the protections which comes in picture during starting ?

6 Answers  

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what is the use of ballast in tube

2 Answers  

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What happen if the 24 volt DC supply is disconnected from air circuit breake ?

2 Answers  

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in soft starter system for 375 KW 3 ph induction motor for multi stage vertical pump, two thyristers failed causing shorting of thyrister. the motor winding failed while starting.What is the cause and what is the effect in above case

1 Answers   KPCL,

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what is mcb

7 Answers   L&T,

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why should we india maintain frequency of 50 Hz.

8 Answers  

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What is the direction of rotation of blades in a table fan and in a ceiling fan ?

11 Answers   Power Grid,

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