Access covers and grates are designed by classes A, B, C, D, E, F and G according to load capacity as set out in the table below. The design loads as specified below, may be used as a guide it is critical that you consult a qualified engineer or designer to ensure the correct class is chosen. The appropriate class for a cover or grate depends upon the place of installation. Some places of installation, relative to class, are outlined below. The selection of the appropriate class is the responsibility of the designer and where there is doubt the stronger class shall be selected.