At zerodha, they provide 40% of 25k as margin for intraday. That is, if 1 lot of nifty positional needs 25k, then 40% of 25k is enough for intraday.
Though margin required is much less for intraday, the risk is more here.
Im poistional, if we lose 100 points it is just 5% lost from 1 lac capital.
Whereas if we lose 100 points in intraday, due to continues loosing trades.. it is more than 10% of our 40k capital