| operation of equipment conforming electrically and mechanically with its design specification and used within the limits specified by the manufacturer|
Note 1 to entry: The limits specified by the manufacturer can include persistent operational conditions, e.g. operation on a duty cycle.
Note 2 to entry: Variation of the supply voltage within stated limits and any other operational tolerance is part of normal operation.
Note 3 to entry: For electric machines, normal operation is specified based on the duty type (S1…S10 per IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance).