Service conditions and definitions for high-voltage fuses (above 1000 V), distribution enclosed single-pole air switches, fuse disconnecting switches, and accessories for ac distribution systems are covered. These include enclosed, open, and open-link types of distribution cutouts and fuses; distribution current-limiting fuses; distribution oil cutouts; distribution enclosed single-pole air switches; power fuses, including current-limiting types; outdoor and indoor fuse disconnecting switches; fuse supports, mountings, hooks, and links, all of the type used exclusively with the above; and removable switch blades for certain products among the above.

This standard applies to high-voltage fuses (above 1000 V), distribution enclosed single-pole air switches, fuse disconnecting switches, and associated accessories that are intended for use on ac distribution systems. This applies to the following equipment: a) Enclosed, open, and open-link types of distribution cutouts and fuses; b) Distribution current-limiting fuses; c) Distribution oil cutouts; d) Distribution enclosed single-pole air switches; e) Power fuses, including current-limiting types; f) Outdoor and indoor fuse disconnecting switches; g) Fuse supports, fuse mountings, fuse hooks, and fuse links, all of the type used exclusively with products listed in items a through f above; h) Removable switch blades for products listed in items a through c above