0,9 to 1,1 of nominal voltage
0,99 to 1,01 of nominal frequency continuously
Harmonic distortion not exceeding 10 % of the total
r.m.s. voltage between live conductors for the sum
of the 2nd through to the 5th harmonic. An additional
2 % of the total r.m.s. voltage between live
conductors for the sum of the 6th through to the 30th
harmonic is permissible.
Neither the voltage of the negative sequence
component nor the voltage of the zero-sequence
component in three-phase supplies exceeding 2 %
of the positive sequence component.
Supply interrupted or at zero voltage for not more
than 3 ms at any random time in the supply cycle
with more than 1 s between successive
interruptions.
Voltage dips not exceeding 20 % of the peak voltage
of the supply for more than one cycle with more than
1 s between successive dips.
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