This standard describes the usual and unusual service conditions for communication equipment that is to operate in electric power generation stations and in generation, transmission, and distribution substations. This standard applies to communication equipment that is located in the zone of influence of the ground potential rise of generation stations and generation, transmission, and distribution substations. The standard applies to communication equipment that may be used for functions such as voice communication, data communication, telemetering, supervisory control, and protective relaying. Base station radio, telephone and power line carrier are considered to be included by the term communication equipment. This standard does not apply to power line carrier line traps, coupling capacitors, coupling capacitor voltage transformers, or line tuning equipment. It does not apply to communication cables and cable protective devices.