Access covers and grates shall be designated by classes A, B, C, D, E, F and G according to load capacity as set out in the table below. The design loads as specified in below table, shall be used for testing.
The appropriate class for a cover or grate depends upon the place of installation. Some places of installation, relative to class, are outlined below. The selection of the appropriate class is the responsibility of the designer and where there is doubt the stronger class shall be selected.
|Class Rating||Typical Use||Nominal Wheel Load (kg)||Serviceability Design Load (kN)||Ultimate Limit State Design Load (kN)|
|A||Areas (including footways) accessible only to pedestrians and pedal cyclists and closed to other traffic (extra-light duty)||330||6.7||10|
|B||Areas (including footways and light tractor paths) accessible to vehicles (excluding commercial vehicles) or livestock (light duty)||2,670||53||80|
|C||Malls and areas open to slow moving commercial vehicles (medium duty)||5,000||100||150|
|D||Carriageways of roads and areas open to commercial vehicles (heavy duty)||8,000||140||210|
|E||General docks and aircraft pavements (extra heavy duty – E)||13,700||267||400|
|F||Docks and aircraft pavements subject to high wheel loads (extra heavy duty – F)||20,000||400||600|
|G||Docks and aircraft pavements subject to very high wheel loads (extra heavy duty – G)||30,000||600||900|