SIST EN IEC 60034-9:2025

Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:2021)

This part of IEC 60034:
– specifies test methods for the determination of sound power level of rotating electrical
machines;
– specifies maximum A-weighted sound power levels for factory acceptance testing of
network-supplied, rotating electrical machines in accordance with lEC 60034-1, having
methods of cooling according to lEC 60034-6 and degrees of protection according to
lEC 60034-5, and having the following characteristics:
• standard design, either AC or DC, without additional special electrical, mechanical, or
acoustical modifications intended to reduce the sound power level
• rated output from 1 kW (or kVA) up to and including 5 500 kW (or kVA)
• rated speed not greater than 3 750 min–1
Excluded are noise limits for AC motors supplied by converters. For these conditions see
Annex B for guidance.
The object of this document is to determine maximum A-weighted sound power levels, LWA in
decibels, dB, for airborne noise emitted by rotating electrical machines of standard design, as
a function of power, speed and load, and to specify the method of measurement and the test
conditions appropriate for the determination of the sound power level of the machines to provide
a standardized evaluation of machine noise up to the maximum specified sound power levels.
This document does not provide correction for the existence of tonal characteristics.
Sound pressure levels at a distance from the machine may be required in some applications,
such as hearing protection programs. Information is provided on such a procedure in Clause 7
based on a standardized test environment.
NOTE 1 This document recognizes the economic reason for the availability of standard noise-level machines for
use in non-critical areas or for use with supplementary means of noise attenuation.
NOTE 2 Where sound power levels lower than those specified in Table 1, Table 2 or Table 3 are required, these
are agreed between the manufacturer and the purchaser, as special electrical, mechanical, or acoustical design may
involve additional measures.

Drehende elektrische Maschinen - Teil 9: Geräuschgrenzwerte (IEC 60034-9:2021)

Machines électriques tournantes - Partie 9: Limites de bruit (IEC 60034-9:2021)

IEC 60034-9:2021 spécifie les méthodes d’essai pour la détermination du niveau de puissance acoustique des machines électriques tournantes et spécifie les niveaux maximaux de puissance acoustique pondérée A pour les essais de réception en usine des machines électriques tournantes alimentées par réseau conformes à l’IEC 60034-1, dont les modes de refroidissement sont conformes à l’IEC 60034-6 et les degrés de protection conformes à l’IEC 60034-5, et qui présentent les caractéristiques suivantes:
- conception normalisée, courant alternatif ou courant continu, sans modifications spéciales électriques, mécaniques ou acoustiques destinées à réduire le niveau de puissance acoustique
- puissance assignée de 1 kW (ou kVA) jusqu'à 5 500 kW inclus (ou kVA)
- vitesse assignée inférieure ou égale à 3 750 min–1
Cette cinquième édition annule et remplace la quatrième édition, parue en 2003 et son amendement 1, paru en 2007. Cette édition inclut les modifications techniques majeures suivantes par rapport à l’édition précédente:
a) Le Tableau 2 et le Tableau 3 couvrent désormais les méthodes de refroidissement IC01, IC11, IC21 et IC31, IC71, IC81.
b) La présente édition ajoute le Tableau 3 pour les machines de 60 Hz, tandis que le Tableau 2, qui ne couvre que les machines de 50 Hz, ne présente pas de modification de niveaux.
c) Dans le Tableau 3, l’ajout du degré A vise à harmoniser les niveaux les plus élevés définis par l’IEC et NEMA, tandis que l’ajout du degré B visait à harmoniser les niveaux plus faibles mais plus restrictifs également définis par l’IEC et NEMA.
d) L'article "Détermination de l’augmentation de bruit provoquée par l’alimentation du convertisseur" a été transféré dans l’Annexe B et renommé "Informations sur l’augmentation type de bruit provoquée par l’alimentation du convertisseur".

Električni rotacijski stroji - 9. del: Mejne vrednosti hrupa (IEC 60034-9:2021)

General Information

• Status: Published
• Public Enquiry End Date: 18-Apr-2021
• Publication Date: 09-Feb-2025
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 29.160 - Rotating machinery
• ICS: 29.160.01 - Rotating machinery in general
• Technical Committee: ERS - Rotating machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 12-Nov-2024
• Due Date: 17-Jan-2025
• Completion Date: 10-Feb-2025
• Directive: 2014/35/EU - Directive 2014/35/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of electrical equipment designed for use within certain voltage limits
• Mandate: M/511 - Mandate to CEN, CENELEC and ETSI relating to harmonised standards in the field of the Low Voltage Directive
• Ref Project: EN IEC 60034-9:2024 - Rotating electrical machines - Part 9: Noise limits

Relations

• Revised: SIST EN 60034-9:2006/A1:2007 - Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:2003/A1:2007)
• Effective Date: 13-Jul-2021

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Električni rotacijski stroji - 9. del: Mejne vrednosti hrupa (IEC 60034-9:2021)
Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:2021)
Drehende elektrische Maschinen - Teil 9: Geräuschgrenzwerte (IEC 60034-9:2021)
Machines électriques tournantes - Partie 9: Limites de bruit (IEC 60034-9:2021)
Ta slovenski standard je istoveten z: EN IEC 60034-9:2024
ICS:
17.140.20 Emisija hrupa naprav in Noise emitted by machines
opreme and equipment
29.160.01 Rotacijski stroji na splošno Rotating machinery in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60034-9

NORME EUROPÉENNE
EUROPÄISCHE NORM November 2024
ICS 29.160.01 Supersedes EN 60034-9:2005; EN 60034-9:2005/A1:2007
English Version
Rotating electrical machines - Part 9: Noise limits
(IEC 60034-9:2021)
Machines électriques tournantes - Partie 9: Limites de bruit Drehende elektrische Maschinen - Teil 9:
(IEC 60034-9:2021) Geräuschgrenzwerte
(IEC 60034-9:2021)
This European Standard was approved by CENELEC on 2024-09-25. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60034-9:2024 E

European foreword
The text of document 2/2064/FDIS, future edition 5 of IEC 60034-9, prepared by TC 2 "Rotating
machinery" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2025-11-30
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2027-11-30
document have to be withdrawn
This document supersedes EN 60034-9:2005 and all of its amendments and corrigenda (if any).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60034-9:2021 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standard indicated:
IEC/TS 60034-25 NOTE Approved as CLC IEC/TS 60034-25
ISO 1680 NOTE Approved as EN ISO 1680
ISO 80000-8 NOTE Approved as EN ISO 80000-8
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments)
applies.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60034-1 - Rotating electrical machines - Part 1: EN 60034-1 -
Rating and performance
IEC 60034-5 - Rotating electrical machines - Part 5: EN IEC 60034-5 -
Degrees of protection provided by the
integral design of rotating electrical
machines (IP code) - Classification
IEC 60034-6 - Rotating electrical machines - Part 6: EN 60034-6 -
Methods of cooling (IC Code)
ISO 3741 - Acoustics - Determination of sound power EN ISO 3741 -
levels and sound energy levels of noise
sources using sound pressure - Precision
methods for reverberation test rooms
ISO 3743-1 - Acoustics - Determination of sound power EN ISO 3743-1 -
levels and sound energy levels of noise
sources using sound pressure -
Engineering methods for small movable
sources in reverberant fields - Part 1:
Comparison method for a hard-walled test
room
ISO 3743-2 - Acoustics - Determination of sound power EN ISO 3743-2 -
levels of noise sources using sound
pressure - Engineering methods for small,
movable sources in reverberant fields -
Part 2: Methods for special reverberation
test rooms
Publication Year Title EN/HD Year
ISO 3744 - Acoustics - Determination of sound power EN ISO 3744 -
levels and sound energy levels of noise
sources using sound pressure -
Engineering methods for an essentially
free field over a reflecting plane
ISO 3745 - Acoustics - Determination of sound power EN ISO 3745 -
levels and sound energy levels of noise
sources using sound pressure - Precision
methods for anechoic rooms and hemi-
anechoic rooms
ISO 3746 - Acoustics - Determination of sound power EN ISO 3746 -
levels and sound energy levels of noise
sources using sound pressure - Survey
method using an enveloping measurement
surface over a reflecting plane
ISO 3747 - Acoustics - Determination of sound power EN ISO 3747 -
levels and sound energy levels of noise
sources using sound pressure -
Engineering/survey methods for use in situ
in a reverberant environment
ISO 4871 - Acoustics - Declaration and verification of EN ISO 4871 -
noise emission values of machinery and
equipment
ISO 9614-1 - Acoustics - Determination of sound power EN ISO 9614-1 -
levels of noise sources using sound
intensity - Part 1: Measurement at discrete
points
ISO 9614-2 - Acoustics - Determination of sound power EN ISO 9614-2 -
levels of noise sources using sound
intensity § Part 2: Measurement by
scanning
IEC 60034-9 ®
Edition 5.0 2021-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Rotating electrical machines –

Part 9: Noise limits
Machines électriques tournantes –

Partie 9: Limites de bruit
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.160.01 ISBN 978-2-8322-4021-2

– 2 – IEC 60034-9:2021 © IEC 2021
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Methods of measurement . 8
5 Test conditions . 8
5.1 Machine mounting . 8
5.1.1 Precautions . 8
5.1.2 Resilient mounting . 9
5.1.3 Rigid mounting . 9
5.2 Test operating conditions . 9
6 Sound power level limits . 9
7 Determination of sound pressure level . 10
8 Declaration and verification of sound power values. 10
Annex A (informative) Typical values for measurement surface index . 16
Annex B (informative) Information on typical noise increments caused by converter
supply . 17
Bibliography . 20

Figure B.1 – Frequency spectrum of the currents at the output terminals of a 6‑pulse
block-type current-source converter f = 50 Hz . 17
Figure B.2 – Frequency spectrum of the voltages at the terminals of a type A
voltage-source converter (characterized by pronounced spikes close to the switching

frequency and its multiples) f = 50 Hz, f = 3 kHz . 17
1 s
Figure B.3 – Frequency spectrum of the voltages of a type B voltage-source converter
(characterized by a broad voltage spectrum without pronounced spikes) f = 50 Hz, f
1 s
average = 4,5 kHz . 18

Table 1 – Maximum A-weighted sound power level, L in dB, at no-load (excluding
WA
motors according to Table 2 and Table 3) (Method of cooling, IC code, see IEC 60034-
6, Method of protection, IP code, see IEC 60034-5) . 12
Table 2 – Maximum A-weighted sound power level, L in dB, at no-load, 50 Hz,
WA
sinusoidal supply (for single speed three-phase cage induction motors). 13
Table 3 – Maximum A-weighted sound power level, L in dB, at no-load, 60 Hz,
WA
sinusoidal supply (for single speed three-phase cage induction motors). 14
Table 4 – Expected increase, over no-load condition, in A-weighted sound power
levels, ΔL in dB, for rated load condition (for motors according to Table 2 and
WA
Table 3) . 15
Table A.1 – Typical values for measurement surface index for the conversion from
sound power level to sound pressure level based on using parallelepiped measurement
surface according to ISO 3744 . 16
Table B.1 – Resonance frequencies of vibration mode r . 18
Table B.2 – Increments of A-weighted noise values . 19

IEC 60034-9:2021 © IEC 2021 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ROTATING ELECTRICAL MACHINES –

Part 9: Noise limits
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
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with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications ha
...