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Dear All, Thanks for the valuable answers, it's concise but clear

Hi davidbeach and lionelhutz I think i didn't point my questions clear,sorry for that... actually 3 points i pointed before is my understanding about bus tie, tried to surf in some link, but found not enough explanation on this one... i know perhaps it's a stupid basic question, but its...

Dear All, here i need a confirmation whether the bus-tie function in MCC is to: 1. connect 2 different rating busbar 2. as an protection,that if one of power supply is fail, the other one can still supply for respective motor. 3. as a connection limit between switchgear and motor controller...

Thanks all, the main thing that still confuses me is that it is only mentioned in the NEC of using 1,25 % of full load current, while there are 2 different ways of getting the load current (look up table, and by manual calculation. as attach). Waross,do you point that nothing's wrong with...

Dear All, i Have Transformer 25 kVA, 480/240-120, 1 phase, 60 Hz and having this problem of calculating the nominal for it's secondary breaker. (For MCC purpose, on Load center unit) i already attach both calculation, and i'm confused, which one should be used/correct, and why? Need your...

Dear All, is there anyone knows, that in this attached catalog, The "maximum amperes" refer to Frame rating or Trip rating? Thank you very much Regards,

Hi all, found these doubt, hopefully someone can help me with these? 1. in MCC, for the bus bracing (RMS Symmetrical), if the requirement needs 22 kA, can 42 kA works for this and why? 2. Still in MCC, if combination starter unit has : (a)unit interrupting rating and (b) ambient complression...

Thanks All for the answer, it really helps =)

Dear All, i'm a new engineer, reviewing technical specification on switchgear(main breaker), and found this term "Distribution : Radial" requirement in Incoming Power Supply, what does it mean anyway? Thanks before for your answer