Section 5(2)(a) in The Foreign Exchange Management (Borrowing And Lending In Rupees) Regulations, 2000
(a)the percentage of Non-convertible Debentures (NCDs) issued to Non-resident Indians (NRIs)/Overseas Corporate Bodies (OCBs) to the total paid-up value of each series of Non-convertible Debentures (NCDs) issued shall not exceed the ceiling prescribed for issue of equity shares/convertible debentures for foreign direct investment in India as specified by the Reserve Bank from time to time, under the relevant regulations, and