Cable sizing and selection - Electrical Designing 

Sure & thanks for motivating me.

Very true.....

Will upload soon

Glad you think so!

Thanks for writting. Dear it's for max fault current. Either we calculate exact fault current or considering max value.

According to 120 mm sq, I thing that must be cu cable

Hello dear, thanks for watching the video. Regatding your query , we need to get current & length for calculation. Basic calculations will be similar some load profile will change.

Dear thanks for watching video.. Now, coming to your question, the basic difference btwn 3C & 3.5C is of neutral...if it's 3ph balanced load then half size core of neutral as compared to phase is sufficient.... In system where there is high neutral current or some OEM suggest due to equipment design then we use neutral as a full core similar to phase. I:e 4core. When power is fully supplied through UPS or through isolation xmer, the 3Core is sufficient neutral not required limiting use to 3ph load nly. Hope it resolves your doubt...if still persists, online classes is starting soon where full designing course will be done one to one.

Please consider more parameters like distance & laying conditions.

Generally k liye...hum 1sq.mm = 1amp...for aluminum cable. We have keep the length in mind...& cable maximum current capacity mentioned In catalogue should be higher than SC.

Thanks you very much for watching the video.. answer: you have take your system fault level & your relay setting..50KA is breaker capacity...that's the very high range..u have calculate according to your system.

It should be considered only for HV cable size calculations for LV size we should consider only ampicity and voltage drop criteria..

Your question is not clear... Plz put in brief

It's MCCB max fault current rating