Section 8(2)(a) in The Tamil Nadu Backward Classes, Scheduled Castes and Scheduled Tribes (Reservation of Seats in Educational Institutions and of Appointments or Posts in the Services under the State) Act, 1993
(a)All rules made under this Act shall be published in the Tamil Nadu Government Gazette and unless they are expressed to come into force on a particular day, shall come into force on the day on which they are so published.