All AC driven electrical equipment shall be selected to operate satisfactorily within the following voltage and frequency limitations: Voltage | Normal | +/-10% of nominal voltage | Transient | +20% / -15% of nominal voltage | Frequency | Normal | +/-10% of nominal frequency | Transient | +/-20% of nominal frequency |
THD:
The total harmonic distortion up to the 25th harmonic on the general power system below 600 V should be maximum 8% and maximum 5% for any single frequency. |