Manhole covers, gullies and gratings can be distinguished into the following classes: A15, B125, C250, D400, E600 ed F900.
Group 6
(Class F900)
Areas subject to particularly high loads , e.g air port runways.
Group 5
(Class E 600 minimum)
Areas subject to high loads, e.g. ports and airports.
Group 4
(Class D 400 minimum)
Road carriageways (including pedestrian streets), hard shoulders and parking areas for all types of road vehicles.
Group 3
(Class C 250 minimum)
For gullies installed in kerbside channels of the pavement which , extends to
0.5 m in the road and to 0.2 m top on the pavement, when measured from the edge.
Group 2
(Class B 125 minimum)
Footways, pedestrian areas or similar, car parks and drop off points, multi store car parks.
Group 1
(Class A15 minumum)
areas which can be used exclusively by pedestrians and cyclists.
