This part of IEC 61000 is concerned with the limitation of voltage fluctuations and flicker
impressed on the public low-voltage system.
It specifies limits of voltage changes which may be produced by an equipment tested under
specified conditions and gives guidance on methods of assessment.
This part of IEC 61000 is applicable to electrical and electronic equipment having an input
current equal to or less than 16 A per phase, intended to be connected to public low-voltage
distribution systems of between 220 V and 250 V line to neutral at 50 Hz, and not subject to
Equipment which does not comply with the limits of this part of IEC 61000 when tested with
the reference impedance Zref of 6.4, and which therefore cannot be declared compliant with
this part, may be retested or evaluated to show conformity with IEC 61000-3-11. Part 3-11 is
applicable to equipment with rated input current ≤ 75 A per phase and subject to conditional
The tests according to this part are type tests. Particular test conditions are given in Annex A
and the test circuit is shown in Figure 1.
NOTE 1 The limits in this standard relate to the voltage changes experienced by consumers connected at the
interface between the public supply low-voltage network and the equipment user’s installation. Consequently, if the
actual impedance of the supply at the supply terminals of equipment connected within the equipment user’s
installation exceeds the test impedance, it is possible that supply disturbance exceeding the limits could occur.
NOTE 2 The limits in this standard are based mainly on the subjective severity of flicker imposed on the light from
230 V 60 W coiled-coil filament lamps by fluctuations of the supply voltage. For systems with nominal voltage less
than 220 V line to neutral and/or frequency of 60 Hz, the limits and reference circuit values are under