1 Scope and field of application
2 Concepts, symbols and manhole components
      2.1 Concept
      2.2 Symbols
             2.2.1 Symbols denoting manhole components
             2.2.2 Symbols denoting quantities
      2.3 Manhole components
             2.3.1 Bottom shaft section
                      2.3.1.1 Base seating ring
             2.3.2 Socketed manhole section
             2.3.3 Socketed single-unit shaft
             2.3.4 Socketed reducing section
             2.3.5 Socketed reducing slab
             2.3.6 Socketed straight-back taper
             2.3.7 Socketed cover slab
             2.3.8 Seating ring
             2.3.9 Manhole top
3 Requirements
      3.1 Materials
             3.1.1 Plain concrete
             3.1.2 Reinforcing steel
             3.1.3 Seals
      3.2 Dimensions
      3.3 Interchangeability of components
      3.4 Strength and stability
             3.4.1 Crushing strength of manhole sections
             3.4.2 Strength of fragments
             3.4.3 Stability
      3.5 Watertightness
      3.6 Hydraulic design
      3.7 Chemical resistance
      3.8 Connections
      3.9 Jointing of components
      3.10 Construction and installation
4 Testing
      4.1 Materials
             4.1.1 Plain concrete
             4.1.2 Reinforcing steel
             4.1.3 Seals
      4.2 Dimensions
      4.3 Interchangeability of components
      4.4 Strength and stability
             4.4.1 Crushing strength of manhole sections
             4.4.2 Strength of fragments
             4.4.3 Stability
      4.5 Watertightness
      4.6 Hydraulic design
      4.7 Chemical resistance
      4.8 Connections
      4.9 Jointing of components
5 Access facilities
      5.1 Hand grips
      5.2 Step irons
      5.3 Ladders
6 Inspection
      6.1 General
      6.2 Internal control
      6.3 Third-party inspection
7 Marking