law: Factories Act, 1948 
  58. Prohibition of overlapping shifts 
  (1) Work shall not be carried on in any factory by means of a
  
  system of shifts so arranged that more than one relay of workers is engaged in
  
  work of the same kind at the same time.
   75  [(2) The State Government or subject to the control of the
  
  State Government, the Chief Inspector, may, by written order and for the
  
  reasons specified therein, exempt on such conditions as may be deemed
  
  expedient, any factory or class or description of factories or any department
  
  or section of a factory or any category or description of workers therein from
  
  the provisions of sub-section (1).]