Classification of ductile iron manhole covers

There are many types of manhole covers, single-layer, double-layer, cast iron manhole covers, ductile iron manhole covers, composite manhole covers, cement concrete manhole covers, etc. Among them, ductile iron manhole covers are the most widely used. According to the En124 standard, manhole covers are divided into six grades according to the load-bearing capacity :

Group 1 （A15）— areas where only pedestrians have access. Covers and gratings capable of withstanding a 15kN test load.

Group 2（B125）—car parks and pedestrian areas where only occasional vehicular access is likely (incl. driveways). Covers and gratings capable of withstanding a 125kN test load.

Group 3 （C250）— car parks, forecourts, industrial sites and areas with slow moving traffic. Also in highway locations up to 500mm from the kerb and up to 200mm into the verge, excluding motorways. Covers and gratings capable of withstanding a 250kN test load.

Group 4 （D400）— areas where cars and lorries have access, including carriageways, hard shoulders and pedestrian areas. Covers and gratings capable of withstanding a 400kN test load.

Group 5（E600） — areas where high wheel loads are imposed, such as loading areas, docks or aircraft pavements. Covers and gratings capable of withstanding a 600kN test load.

Group 6（F900） — areas where particularly high wheel loads are imposed such as aircraft pavements. Covers and gratings capable of withstanding a 900kN test load.