Section 7(3) in The West Bengal Factories (Safety Officers) Rules, 1978
(3)The Chief Safety Officer or a Safety Officer may be employed either on a tenure basis or on a permanent basis. Where he is appointed on a tenure basis, the term shall not be less than three years and the period of probation shall be six months and where the appointment is on a permanent basis, the period of probation shall not be less than one year or more than two years.Any such officer appointed on a tenure basis shall ordinarily be entitled to a renewal of such periodical contract.
