Adjustable speed electrical power drive systems--Part 2:General requirements--Rating specifications for low voltage adjustable frequency a.c. power drive systems
Adjustable speed electrical power drive systems--Part 1:General requirements--Rating specifications for low voltage adjustable speed d.c. power drive systems
Adjustable speed electrical power drive systems - part 4: General requirements - Rating specifications for a.c. power drive systems above 1000V a.c. and not exceeding 35kV