what is the safe meggar values for motor, transformer HT, LT and Cables? IF

what is the safe meggar values for motor, transformer HT, LT
and Cables?

IF we want to replace I/C bay at our 220 kv substation which
is of 140 mw load capacity bay to be replaced by 400 mw
capacity bay.other than CT(1200/1) what are the other
equipment i have to replace.

why we generally use 3.5 core cable or in other word 1/2
core for neutral and also confirm me that in balance
conditiob(3 phase)current in neutral will zero

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