Various
The ultimate manhole covers site
Specifies requirements for cast iron covers and frames made from grey iron or ductile iron. These items of road furniture can be fire hydrants, meters, air valves, water meters, sluice valves or stopcocks. Details design, product selection, drainage and skid resistance, safety and loading.

Document for downloading the standard from the Irish Standards Institute we https://shop.standards.ie/en-ie/standards/i-s-261-2013-868345_saig_nsai_nsai_2065029/

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
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