Cast iron covers represents the appropriate solution for the protection of the sewage or water adduction and for the telecommunications networks. The roll of the covers is to clench the pits (manholes with diameters>600 mm) or the inspection chambers (manholes with diameters≤600mm). Grates are the covers with flits, which additional to the protection roll, also allow the discharge of the rain water in the sewage.
SR EN 124:1996 Gully tops and manhole tops for vehicular and pedestrian areas. Design requirements, type testing, marking, quality control.
Cast iron covers types according to SR EN 124
- Group1 – (min. class A15) cast iron covers with load of min 1.5 t
- Group2 – (min. class A125) cast iron covers with load of min 12.5 t
- Group3 – (min. class A250) cast iron covers with load of min 25 t
- Group4 – (min. class A400) cast iron covers with load of min 40 t