In perforated cover plates, the centre to centre distance between the perforations should not be

- 1
  
  less than 1.5 times the length of perforation
- 2
  
  more than 1.5 times the length of perforation
- 3
  
  less than 2.5 times the length of perforation
- 4
  
  less than 3.5 times the length of perforation

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