IEC 61000-4-30:2025/COR1:2026

• Status: Published
• Publication Date: 16-Jul-2026
• ICS: 33.100.99 - Other aspects related to EMC
• Technical Committee: SC 77A - EMC - Low frequency phenomena
• Current Stage: PPUB - Publication issued
• Start Date: 17-Jul-2026
• Completion Date: 10-Aug-2026

• Corrects: IEC 61000-4-30:2025 - Electromagnetic compatibility (EMC) - Part 4-30: Testing and measurement techniques - Power quality measurement methods
• Effective Date: 29-May-2026

INTERNATIONAL ELECTROTECHNICAL COMMISSION
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
IEC 61000-4-30 IEC 61000-4-30
Edition 4.0  2025-10 Edition 4.0  2025-10

Electromagnetic compatibility (EMC) - Compatibilité électromagnétique (CEM) -
Part 4-30: Testing and measurement Partie 4-30: Techniques d'essai et de
techniques - Power quality measurement mesure - Méthodes de mesure de la qualité
methods de l'alimentation
CO RRI G E NDUM 1
Corrections to the French version appear after the English text.
Les corrections à la version française sont données après le texte anglais.

Introduction to the corrigendum
During the final editing of the text for IEC 61000-4-30:2025 (Edition 4), some characters and
mathematical expressions were corrupted due to the use of different text editor versions.
As a result, some subclauses include missing characters which may lead to confusion or wrong
interpretation of the measurement method associated to some power quality parameters.
This corrigendum is intended to restore the missing characters, to harmonize the notation of
the mathematical expressions along the subclauses, and to fix minor typos, grammar errors,
and erroneous references between clauses or to other documents.

5.12.1 General
Replace the fourth paragraph (after Note 3) with the following:
ΔU
A voltage transition is classified as an RVC only if the absolute value of the difference
SS
ΔU
between consecutive steady-state RMS values is greater than a value SS_min set by the user
ΔU
as a percentage (0 % to 100 %) of the RVC threshold Θ. A value of 0 % disables the
SS_min
checking and should be the default, unless set to a different value by the user.
IEC 61000-4-30:2025-10/COR1:2026-07(en-fr)

5.12.2.1 Single-phase RVC detection
Replace, in Class A, in the second paragraph, in the second bullet, Formula (4) with the
following:

true when ∀U ∈ :UU ∈− Θ,U + Θ
[ ]
 mean mean
rms ½ rms ½
( ) ( )
S=
(4)

false otherwise


Replace, in Class A, in the fourth paragraph, in the second bullet, Formula (5), Formula (6) and
Formula (7) with the following:
 false when Ct
()
US

St true when C t∧¬C t
() () () (5)

SS US

St−1 otherwise
( )


true when ∀U t ∈Ut−−2 Θ,Ut−+2 Θ
() ( ) ( )
 mean mean
rms ½ 
( )
Ct =
() (6)

US
false otherwise


true when ∀∈i t−N, t :U i ∈ Ut − Θε− ,Ut + Θε−
[ ] () () ( ) () ( )
 rms ½ mean mean
( ) 
C t =
() (7)

SS
false otherwise


5.12.3.1 General
Replace the text with the following:
An RVC event is characterized by four parameters: start time, duration, ΔU and ΔU .
max SS
D.6.2 DFT window design
Replace Table D.1 with the following:
Table D.1 – Band A IF filter impulse response zero-crossing times
i t T i t T
Z,i DFT Z,i DFT
(ms) (ms) (ms) (ms)
1 10,113 725 not compliant 4 31,660 060 not relevant
2 17,387 926 20 5 38,760 317 40
3 24,542 897 30 6 45,851 541 50

=
D.7.6 RMS-average detector
Replace Formula (D.25) with the following:
T
c
N + 0,5
(D.25)

T
sbb
D.10.3.1 G
...