law: Factories Act, 1948 
  47. Shelters, rest rooms and lunch rooms 
  (1) In every factory wherein more than one hundred and fifty
  
  workers are ordinarily employed, adequate and suitable shelters or rest rooms
  
  and a suitable lunch room, with provision for drinking water, where workers can
  
  eat meals brought by them, shall be provided and maintained for the use of the
  
  workers:
  PROVIDED  that any canteen maintained in accordance with
  
  the provisions of section 46 shall be regarded as part of the requirements of
  
  this sub-section:
  PROVIDED FURTHER  that where a lunch room exists no worker shall
  
  eat any food in the work room.
  (2) The shelters or rest rooms or lunch rooms to be provided
  
  under sub-section (1) shall be sufficiently lighted and ventilated and shall be
  
  maintained in a cool and clean condition.
  (3) The State Government may- 
  (a) prescribe the standards in respect of
  
  construction, accommodation, furniture and other equipment of shelters, rest
  
  rooms and lunch rooms to be provided under this section;
  (b) by notification in the Official Gazette,
  
  exempt any factory or class or description of factories from the requirements
  
  of this section.