Sets out general requirements for fuses incorporating enclosed fuse-links with rated breaking capacities not less than 2 kA, intended for the protection of power-frequency a.c. circuits having rated voltages not exceeding 1000 volt or d.c. circuits having rated voltages not exceeding 1500 V. It does not apply to miniature fuses; nor does it apply to fuses combined with mechanical switching devices, but it does apply to fuse-links intended to be used in such equipment,