Section 12(b) in The Assam State Electricity Board Engineering Service Regulations, 1973
(b)An officer shall not be eligible for promotion to the rank of Executive Engineer unless he passes such departmental examination as may be prescribed by the Board from time to time. The Board may, however, promote an officer who has not passed the aforesaid examination on a provisional basis subject to the condition that he shall have to pass the said examination within such period as may be stipulated at the time of promotion :
