Description: The article presents ANSI standard C92.2-1987. This standard supersedes ANSI C92.2-1981, preferred voltage ratings for alternating-current electrical systems and equipment operating at voltages above 230 kV nominal. Preferred maximum voltage ratings provide guidance in the development and design of these systems and equipment. Preferred nominal voltage ratings are included to provide consistent standard designations for electrical systems in the extra-high and ultra-high voltage classes. This standard includes preferred voltage ratings up to and including 1200 kV maximum system voltage, as defined in the standard.
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