Section 9(a) in The Assam State Electricity Board Engineering Service Regulations, 1973
(a)Junior Engineers who have put in not less than 9 years of continuous service as Subordinate Engineer Grade I and/or Junior Engineer or both under the Board including services under the Government or other autonomous body, if any, will be eligible for promotion to the post of Assistant Engineer, subject to the work and conduct of the candidate having been satisfactory, and further subject to his having passed the departmental examination as may be prescribed, unless exempted by any special or general order :
