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Switchgear Riddle No.14 - Selection of equipments in switchgear(LV)
What are the characteristics of various types(B,C,D etc)of MCBs available,applications(types of load) resistive,capacitice,motor,welding etc as well as duty types(intermittant,continuous periodic etc).How to select one for instance for a  motor of 10hp,15A by across the line,wye delta,auto transformer starters?.How to avoid tripping due to inrush current?.
Similarly types of MCCB available(cat A,B etc) ,significance of Ir,Ith,Icm,Icu,Ics,Icw,Im(SC) and their relation ship(=,<,>,xtimes) to each other?. Selection of MCCB and settings of Ir,Im,I inrush ,EF etc for a motor rated 100hp 150A.Difference between thermal magnetic model and microprocessor model?.Settings for inrush current,starting time,time delay setting for EF etc?.
Author : Sinnadurai Sripadmanaban - From: Srilanka
Wed, February 16th, 2011 - 11:16
Table below shows a partial overview of the applicable standards for switchgear apparatus.

Author : Hamid - From: Iran- Firouzabad in Fars
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