Section 10(4)(iii) in Employees' State Insurance (General) Regulations, 1950
(iii)A member of the regional board referred to in [clause (f)] [ Substituted by Noti. No. Gen./Amdt./20, dated 20.1.1968.] of sub-regulation (1) shall cease to hold office when he ceases to be a member of the Corporation or ceases to reside in that area.