1987IEEE C37.06-1987 Switchgear - AC High- Voltage Circuit Breakers Rated on a Symmetrical Current Basis - Preferred Ratings and Related Required Capabilities (Supplement C37.06A - 1989; Now copyrigted by NEMA)
1979IEEE C37.06-1979 PREFERRED RATINGS AND RELATED REQUIRED CAPABILITIES FOR AC HIGH-VOLTAGE CIRCUIT BREAKERS RATED ON A SYMMETRICAL CURRENT BASIS