sinnadurai sripadmanaban

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  • in reply to: breaker sizing #11742

    There are many types of circuit breakers(oil,air,SF6,vacuum etc) but all of them do the same functions namely making or breaking a circuit.

    Generally speaking big CBs are classified as Type A or B and capabliities(Ir,Im,Icw,Ics,Icu etc)

    MCCBs as general use current limiting,motor type etc

    MCBs are classified as type B,C,D etc due to tripping characteristics of load(resistive,inductive,motor,fluctuating,welding etc)

    Refer switchgear functions and selection

    in reply to: Power factor correction kvar policy in countries #11728

    1)Should we disconnect capacitor bank when powered by a generator?.

    2)Can somebody give ratings of capacitors for starting(reducing starting current) induction motors for various sizes of motors(hp/rpm)?.

    3)Can somebody give ratings of capacitors for pfc of individual motors of different hp/rpm


    in reply to: Cable Sizing based on Load #11655


    BS7671 gives method of applying diversity factors for various types of loads(domestic) and applying factors like ambient temp,grouping factor,enclosed/open etc to select cable. Selection for motor loads should be referred in NEC

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