These supplementary requirements apply to fuses for use by authorized persons. Covers rated currents of the fuse holder, rated power dissipation of a fuse link and rated power acceptance of a fuse holder, limits of time current characteristics, gates for "aM" fuse links, rated breaking capacity, minimum rated breaking capacities, markings of the fuse holders and links, insulating properties, cut off current characteristic, verification of time current characteristics and gates, verification of resistance to heat of the fuse holder and mechanical strength.