law: Factories Act, 1948 
  24. Striking gear and devices for cutting off power 
  (1) In every factory- 
  (a) suitable striking gear or other efficient
  
  mechanical appliance shall be provided and maintained and used to move driving
  
  belts to and from fast and loose pulleys which form part of the transmission
  
  machinery, and such gear or appliances shall be so constructed, placed and
  
  maintained as to prevent the belt from creeping back on to the fast pulley;
  (b) driving belts when not in use shall not be
  
  allowed to rest or ride upon shafting in motion.
  (2) In every factory suitable devices for cutting off power in
  
  emergencies from running machinery shall be provided and maintained in every
  
  workroom:
  PROVIDED  that in respect of factories in operation
  
  before the commencement of this Act, the provisions of this sub-section shall
  
  apply only to workrooms in which electricity is used as power.
   45  [(3) When a device, which can inadvertently shift from
  
  "off " to "on" position, is provided in a factory to cut
  
  off power, arrangements shall be provided for locking the device in safe
  
  position to prevent accidental starting of the transmission machinery or other
  
  machines to which the device is fitted.]