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how we select the mva rating of the circuit breakers?

how we select the mva rating of the circuit breakers?..

accordig to the voltage of the system & peak value of fault
current to be interrupted by the breaker

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More Electrical Engineering Interview Questions

y we use neutral,all r told its used to for closed path..k its a just used to closed path,in a transmission line y we put same conductor used n both phase and neutral..if we use less than phase conductor in neutral mean we ll reduce cost its right r wrong..if we use mean any problem occur in transmission line..

how to setting voltage RTCC panel

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my company total load is 1000kw, 415volt, all load are inductive load. incoming powerfactor is .8. we want to have0.95 pf connecting capacitors. so now how much rating of capacitors we have to connect? show how?

in transfomer which type of oil is use!

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For 160kw motor what size of cable and material is needed.?

ii) A shunt motor supplied at 230V, runs at 900 rpm when the current is 30A. The resistance of the armature is 0.4 ohms. Calculate the resistance required in series with the armature to reduce the speed to 600 rpm, assuming that the armature current is then 20A. [12]

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