DS/EN 61000-3-3:2013/A2:2021

Electromagnetic compatibility (EMC) - Part 3-3: Limits - Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current 16 A per phase and not subject to conditional connection

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.