2014GB/T 50064-2014 Code for design of overvoltage protection and insulation coordination for AC electrical installations
1984GBJ 64-1983 Specifications for the design of surge protection of industrial and civil electric system (Trial)
GBJ 64-1983 Specifications for the design of surge protection of industrial and civil electric system (Trial) was changed to GB/T 50064-2014 Code for design of overvoltage protection and insulation coordination for AC electrical installations.