Applicable to design test requirements for high-voltage (above 1000 V) fuses, distribution enclosed single-pole air switches, fuse disconnecting switches, and accessories used on alternating- current distribution systems. The devices are: a) Distribution and power class current-limiting types fuses, b) Distribution and power class expulsion type fuses, c) distribution and power class fuse disconnecting switches, d) Items a) through c) used in fuse enclosure packages, e) fuse supports, fuse mountings and fuse hooks of the type meant for use with distribution and power class fuses, and fuse disconnecting switches, f) Removable switch blades of the type used exclusively with distribution class oil cutouts, power class fuses, and distribution class fuse disconnecting swithces.

IEEE C37.41 : 2008