Answer / ucmed_king

Refer Manufacturer coordination chart for required rating and model of MCCB.

There is a thumb-rule though. Convert KW to HP (KW/0.75), multiply it by 1.5 gives you the rated current. Multiply it by 1.5 for breaker value.

Here's the coordinartion chart:-
http://powertips-elec.blogspot.in/2010/11/selection-charts-for-dol-starters-l.html

Answer / akash

39Amp Per Phase is the actual load, but you can be on safer using side using 50/63Amp MCCB.

During FEED, you will have all the information with regards to cable. How will you calculate the MTO for MV and LV Cables? what are your considerations?

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opkinson's test

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