This guide covers the application of metal-oxide surge arresters to safeguard electric power equipment, with a nominal operating voltage 1000 V and above, against the hazards of abnormally high voltage surges of various origins. This guide provides information on the characteristics of metal-oxide surge arresters, and the protection of substation equipment, distribution systems, overhead lines, and large electrical machines.

This guide covers the application of metal-oxide surge arresters (see IEEE Std C62.11TM-2005) to safeguard electric power equipment against the hazards of abnormally high voltage surges of various origins. This application guide does not cover the application of low-voltage surge protective devices below 1000 V alternating current (ac), except when applied to the secondary of a transformer.

Metal oxide arrester technology and application techniques continue to evolve. In addition, there are changes developing in power systems, such as introduction of dispersed generation, which provide new challenges to the successful application of arresters. The proposed revision of C62.22 will be made to reflect current technology and practices. Purpose clause will not be present in the standard