Section 7(5)(b) in The Chennai Corporation Servants Conduct Rules, 1968
(b)In respect of a Corporation servant on foreign service or on deputation to any other local body or Government, the prescribed authority shall be the Commissioner, Corporation of [Chennai] [Substituted for the word 'Madras' by the City of Madras (Alteration of Name) Act, 1996 (Tamil Nadu Act 28 of 1996).].