NEN EN 1253-4 : 2016

Foreword
1 Scope
2 Normative references
3 Definitions
4 Classification
5 Materials
6 Design and construction
    6.1 General requirements
    6.2 Appearance
    6.3 Clear opening of access covers for man entry
    6.4 Edge protection for access covers of
          reinforced concrete
    6.5 Tightness
          6.5.1 General
          6.5.2 Watertightness: Class Wt
          6.5.3 Odourtightness: Class Ot
          6.5.4 Backflowtightness: Class Bt
          6.5.5 Additional requirements
7 Test methods
    7.1 Loading test
    7.2 Appearance and dimensions
    7.3 Tightness
          7.3.1 Watertightness
          7.3.2 Odourtightness
          7.3.3 Backflowtightness
8 Marking
9 Quality control