This application guide applies to ac high voltage circuit breakers rated in accordance with the methods given in American National Standard Rating Structure for A C High-Voltage Circuit Breakers, C37.04-1964(R1969) and listed in American National Standard Preferred Ratings and Related Required Capabilities for A C High-Voltage Circuit Breakers, C37.06-1971. Circuit breakers rated and manufactured to meet other standards, or used in switchgear assemblies, should be applied in accordance with application procedures adapted to their specific ratings or applications.