Sec 295, Companies Act, 1956.

Dear Ms Shree,

if a director is providing any loan to any person in its personal capacity, then the public company in which such director holds the  post can not secure that loan by any means whatsoever. 

if lending co is advancing loan and some other co A has guaranteed it, then A must fulfill other criterion as mentioned in the section otherwise the same would attract the applicability of the section.

Yes, the second part of Mr Manish`s answer was what i was looking for. Thank you so much.