1. China Electric Power Research Institute , 12 kV–40.5 kV High Voltage Vacuum Circuit Breaker Ordering Technical Conditions , 2000 , DL/T 403-2000 , pp. 6–8
2. Electric Power Research Institute of Ministry of Electric Power Industry , Wuhan High Voltage Research Institute of Ministry of Electric Power Industry and Xi’an Thermal Engineering Research Institute of Ministry of Electric Power Industry , Preventive Test Procedures for Power Equipment , 1996 , DL/T 596-1996 , pp. 34–36