Relaxation of Rule 19 enforcement enables listing of certain non convertible and infrastructure related debt securities under regulatory relief. Under sub rule (7) of Rule 19, the Board relaxes strict enforcement of sub rules (1) and (3) of Rule 19 for listing non convertible securities and relaxes clause (b) of sub rule (2) for listing debt securities issued by private placement and debt issued to the public by infrastructure companies, Government companies, statutory authorities or corporations, or their special purpose vehicles engaged in the infrastructure sector, with 'infrastructure sector' given the same meaning as in the referenced capital and disclosure regulations.