Original "This project covers communications networking devices installed in electric power substations. Such devices include modems, auto dialers, Ethernet hubs and switches, routers, and firewalls. It will not cover such equipment designed for operation in other environments, such as office locations." The only change being proposed is to add the words: and Testing to the Title. Original -To develop standard service conditions, standard ratings, environmental performance requirements, and testing requirements for networking devices installed in electric power substations. Revised - add the words: and Testing to the title. New IEEE Standard - Superseded. Service conditions, electrical ratings, thermal ratings, and environmental testing requirements are defined for communications networking devices to be installed in electric power substations. This standard establishes a common reproducible basis for designing and evaluating communications networking devices for use in this harsh environment.