Section 179(7) in The Coal Mines Regulations, 2017
(7)No person shall be appointed as a competent person under this regulation unless he holds a Manager's, Overman's or Gas testing Certificate.Provided that, after coming into force of these regulations, a holder of Lamp Checker's Certificate granted under regulation 12 of the Coal Mines Regulations, 1957, shall also deemed to be a competent person under this regulation.