Answer Posted / p krishna teja

in delta connection there is no common point ( i:e no
netural) for lighting we need netural line for
maintaining voltage difference. so star connection is need
for lighting .

on delta connection 3 phase we can only get 415 volts as
there is no netural line we cant use individual phase .
But in stare connection 3 phase ther is flexibility of
using individual phases with common netural 230 volts.

In both 600/1000 V cable and 450/750 V cable, we can supply 415 V. However for distribution, all utilities are using only 600/100 V instead of 450/750 V. What is the reason?

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