A standard of the Mexican Federal Electricity Commission (CFE) for covers manufactured for its use.
84A is a standard used on roads for covers designed to withstand loads caused by vehicles.
This standard distinguishes between covers made of metal and those made of plastic (composite materials): 2DI00-37 is used for metal covers, while 2DI00-38 is used for covers made of composite materials.
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.