Section 7(2) in Bihar Boiler Operation Engineer's Rules, 1960
(2)A person in charge of a boiler or boilers for which a certificate of proficiency is required under these Rules may be relieved of charge in any one day for not more than two periods which when combined do not exceed two hours in duration by a person holding a first class certificate of competency as an attendant under Bihar Boiler Attendants Rules, 1948.
