Section 89(3)(b) in Rajasthan Factories Rules, 1951
(b)Break down repairs to the motive power, transmission or other essential plant of other factories, collieries, railways, dockyards, harbours, tramways, transport, gas, electrical generating and transmission pumping or similar essential or public utility services carried out in general engineering works and foundries and which are necessary to enable such concerns to maintain their main manufacturing processes production or services during normal working hours.