(1) There shall be three cadres of Service, namely, Civil, Electrical and Mechanical comprising of various posts as may be determined separately for each cadre on the 1st day of January each year or as soon thereafter, as may be practicable according to the provisions of Appendix A. The strength of the respective cadre so determined shall remain in force till it is revised by the Government.
(2) The officers of Civil, Electrical and Mechanical cadres shall be posted or appointed only against the respective posts in their cadre.
Explanation.– Once an officer has been appointed as member of the Service, his promotion within the Service from one rank to another shall be regarded as promotion within the same cadre.
(3) Notwithstanding anything contained in sub-section (1), the Government may appoint a member of the Service to an ex-cadre post not included in the Service in accordance with the provisions of this Act, provided such post has been sanctioned.