This standard applies to the terminal marks of AC motors and DC commutator motors; the direction of rotation; the relationship between the terminal marks and the direction of rotation.
GB 1971-1980 history
2021GB/T 1971-2021 Rotating electrical machines—Terminal markings and direction of rotation
2006GB 1971-2006 Rotating electrical machines. Terminal markings and direction of rotation
1980GB 1971-1980 Terminal markings and direction of rotation of rotating electrical machines