Last edit: 08/08/2025
General
The electrical equipment shall be designed to operate correctly under the following supply conditions:
In case of voltage variations within a voltage range that varies between 85% and 110% of the nominal voltage( in AC current); in case of battery operation, the variations can occur between a range that varies from 85% to 120% of the rated voltaged, considering this variatons as a normality.
Power stations
In steam boiler installations within power stations, events such as shunt faults or the startup of large three-phase actuators may require specific additional conditions. The equipment must tolerate voltage superimposition up to 10% of the nominal AC voltage and 15% for DC voltage. It must also handle frequency fluctuations within a range of 95% to 105% of the nominal frequency. Different arrangements may be necessary for station-service plants. These ranges can be adjusted by agreement between the supplier and the user, or exceeded if the equipment is certified for such conditions.