1 Scope
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 conditional connection.
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 connection.
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 consideration.
