Section 73H(1)(b) in Maharashtra Factories Rules, 1963
(b)The plant, machinery or equipment concerned with the hazardous process shall be in-charge of such operators only who have been trained and made thoroughly conversant to be fit persons to be incharge thereof and no other persons shall be allowed to operate the plant, machinery or equipment. The operators shall be regular employees of the Occupier and shall in no case be persons who are employed as contract workers.