oSIST prEN IEC 60034-9:2021

Rotating electrical machines - Part 9: Noise limits

Drehende elektrische Maschinen - Teil 9: Geräuschgrenzwerte

Machines électriques tournantes - Partie 9: Limites de bruit

Električni rotacijski stroji - 9. del: Omejitve hrupa

General Information

• Status: Not Published
• Public Enquiry End Date: 18-Apr-2021
• 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: 5020 - Formal vote (FV) (Adopted Project)
• Start Date: 09-Aug-2021
• Due Date: 27-Sep-2021
• 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: FprEN IEC 60034-9:2021 - Rotating electrical machines - Part 9: Noise limits

RELATIONS

• Revised: SIST EN 60034-9:2006 - Rotating electrical machines - Part 9: Noise limits (IEC 60034-9:2003, modified)
• Effective Date: 21-Apr-2020
• 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
oSIST prEN IEC 60034-9:2021
01-april-2021
Električni rotacijski stroji - 9. del: Omejitve hrupa
Rotating electrical machines - Part 9: Noise limits
Drehende elektrische Maschinen - Teil 9: Geräuschgrenzwerte
Machines électriques tournantes - Partie 9: Limites de bruit
Ta slovenski standard je istoveten z: prEN IEC 60034-9:2021
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
oSIST prEN IEC 60034-9:2021 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
oSIST prEN IEC 60034-9:2021
---------------------- Page: 2 ----------------------
oSIST prEN IEC 60034-9:2021
2/2034/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60034-9 ED5
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2021-01-29 2021-04-23
SUPERSEDES DOCUMENTS:
2/1994/CD, 2/2022A/CC
IEC TC 2: ROTATING MACHINERY
SECRETARIAT: SECRETARY:
United Kingdom Mr Charles Whitlock
OF INTEREST TO THE FOLLOWING COMMITTEES: PROPOSED HORIZONTAL STANDARD:
Other TC/SCs are requested to indicate their interest, if any, in
this CDV to the secretary.
FUNCTIONS CONCERNED:
EMC ENVIRONMENT QUALITY ASSURANCE SAFETY

SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING

Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft for Vote
(CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.

This document is still under study and subject to change. It should not be used for reference purposes.

Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.
TITLE:
Rotating electrical machines – Part 9: Noise limits
PROPOSED STABILITY DATE: 2024
NOTE FROM TC/SC OFFICERS:

Copyright © 2021 International Electrotechnical Commission, IEC. All rights reserved. It is permitted to download this

electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.

You may not copy or "mirror" the file or printed version of the document, or any part of it, for any other purpose without

permission in writing from IEC.
---------------------- Page: 3 ----------------------
oSIST prEN IEC 60034-9:2021
– 2 – IEC CDV 60034-9  IEC 2021
CONTENTS

CONTENTS ............................................................................................................................ 2

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope ............................................................................................................................... 6

2 Normative references ....................................................................................................... 6

3 Terms and definitions ....................................................................................................... 7

4 Methods of measurement ................................................................................................. 9

5 Test conditions ................................................................................................................. 9

5.1 Machine mounting ................................................................................................... 9

5.1.1 Precautions ................................................................................................. 9

5.1.2 Resilient mounting ....................................................................................... 9

5.1.3 Rigid mounting .......................................................................................... 10

5.2 Test operating conditions ...................................................................................... 10

6 Sound power level limits ................................................................................................. 10

7 Determination of sound pressure level ............................................................................ 11

8 Declaration and verification of sound power values ........................................................ 11

9 Bibliography ................................................................................................................... 12

Annex A (informative) – Levels of typical conversion values from power to pressure ............. 17

Annex B (informative) – Information on typical noise increments caused by converter

supply ............................................................................................................................ 18

Table 1 – Maximum A-weighted sound power level, L in dB, at no-load (excluding

motors according to Tables 2a and 2b) (Method of cooling, IC code, see IEC 60034-6)

(Method of protection, IP code, see IEC 60034-5) ................................................................. 13

Table 2a – Maximum A-weighted sound power level, L in dB, at no-load, 50Hz,

sinusoidal supply (for single speed three-phase cage induction motors) .............................. 14

Table 2b – Maximum A-weighted sound power level, L in dB, at no-load, 60Hz,

sinusoidal supply (for single speed three-phase cage induction motors) .............................. 15

Table 3 –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) ................................. 16

Table 4 – Typical values for measurement surface index for the conversion from sound

power to sound pressure based on using parallelepiped acc. to ISO 3744 ............................ 17

---------------------- Page: 4 ----------------------
oSIST prEN IEC 60034-9:2021
IEC CDV 60034-9  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 may participate in this preparatory work. International, governmental and non-

governmental organizations liaising 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 have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 60034-9 has been prepared by IEC technical committee 2:

Rotating machinery.
Comment for CDV: The red font shows where the publication has been modified.

This fifth edition cancels and replaces the fourth edition 4.1 published in 2007 and all

amendments. This edition includes the following significant technical changes:

• In Tables 2 cooling methods IC01, IC11, IC21 and IC31, IC71, IC81 are now covered.

• This edition adds Table 2b for 60 Hz machines, whereas Table 2a, which covers only 50

Hz machines, has no change in levels.

• In Table 2b, grade A is added to harmonize the highest levels seen in IEC and NEMA,

whereas grade B was added to harmonize the lowest, more restrictive, levels seen in IEC

and NEMA.
---------------------- Page: 5 ----------------------
oSIST prEN IEC 60034-9:2021
– 4 – IEC CDV 60034-9  IEC 2021

• The chapter “Determination of noise increments caused by converter supply” has been

shifted to Annex B and renamed to “Information on typical noise increments caused by

converter supply”

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of the base publication and its amendments will

remain unchanged until the maintenance result date indicated on the IEC web site under

"http://webstore.iec.ch" in the data related to the specific publication. At this date,

the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
oSIST prEN IEC 60034-9:2021
IEC CDV 60034-9  IEC 2021 – 5 –
1 INTRODUCTION

2 Acoustic quantities can be expressed in sound pressure terms or sound power terms. The use

3 of a sound power level, which can be specified independently of the measurement surface

4 and environmental conditions, avoids the complications associated with sound pressure

5 levels, which require additional data to be specified. Sound power levels provide a measure of

6 radiated energy and have advantages in acoustic analysis and design.
---------------------- Page: 7 ----------------------
oSIST prEN IEC 60034-9:2021
– 6 – IEC CDV 60034-9  IEC 2021
9 ROTATING ELECTRICAL MACHINES –
11 Part 9: Noise limits
15 1 Scope
16 This part of IEC 60034:

17 – specifies test methods for the determination of sound power level of rotating electrical

18 machines;

19 – specifies maximum A-weighted sound power levels for factory acceptance testing of

20 network-supplied, rotating electrical machines in accordance with lEC 60034-1, having

21 methods of cooling according to lEC 60034-6 and degrees of protection according to

22 lEC 60034-5, and having the following characteristics:

23 • standard design, either a.c. or d.c., without additional special electrical, mechanical, or

24 acoustical modifications intended to reduce the sound power level;
25 • rated output from 1 kW (or kVA) up to and including 5 500 kW (or kVA);
26 • rated speed not greater than 3 750 min .

27 Excluded are noise limits for a.c. motors supplied by converters. For these conditions see

28 Annex B for guidance.

29 The object of this standard is to determine maximum A-weighted sound power levels, L in

30 decibels, dB, for airborne noise emitted by rotating electrical machines of standard design, as

31 a function of power, speed and load, and to specify the method of measurement and the test

32 conditions appropriate for the determination of the sound power level of the machines to

33 provide a standardized evaluation of machine noise up to the maximum specified sound

34 power levels. This standard does not provide correction for the existence of tonal

35 characteristics.

36 Sound pressure levels at a distance from the machine may be required in some applications,

37 such as hearing protection programs. Information is provided on such a procedure in Clause 7

38 based on a standardized test environment.

39 NOTE 1 This standard recognizes the economic reason for the availability of standard noise-level machines for

40 use in non-critical areas or for use with supplementary means of noise attenuation.

41 NOTE 2 Where sound power levels lower than those specified in Tables 1 or 2 are required, these should be

42 agreed between the manufacturer and the purchaser, as special electrical, mechanical, or acoustical design may

43 involve additional measures.
44 2 Normative references

45 The following referenced documents are indispensable for the application of this document.

46 For dated references, only the edition cited applies. For undated references, the latest edition

47 of the referenced document (including any amendments) applies.
48 IEC 60034-1, Rotating electrical machines – Part 1: Rating and performance
---------------------- Page: 8 ----------------------
oSIST prEN IEC 60034-9:2021
IEC CDV 60034-9  IEC 2021 – 7 –

50 IEC 60034-5, Rotating electrical machines – Part 5: Degrees of protection provided by the

51 integral design of rotating electrical machines (IP code) – Classification

52 IEC 60034-6, Rotating electrical machines – Part 6: Methods of cooling (IC Code)

53 ISO 3741, Acoustics – Determination of sound power levels of noise sources using sound

54 pressure – Precision methods for reverberation rooms

55 ISO 3743-1, Acoustics – Determination of sound power levels of noise sources – Engineering

56 methods for small, movable sources in reverberant fields – Part 1: Comparison method for

57 hard-walled test rooms

58 ISO 3743-2, Acoustics – Determination of sound power levels of noise sources using sound

59 pressure – Engineering methods for small, movable sources in reverberant fields – Part 2:

60 Method for special reverberation test rooms

61 ISO 3744, Acoustics – Determination of sound power levels of noise sources using sound

62 pressure – Engineering method in an essentially free field over a reflecting plane

63 ISO 3745, Acoustics – Determination of sound power levels of noise sources – Precision

64 methods for anechoic and semi-anechoic rooms

65 ISO 3746, Acoustics – Determination of sound power levels of noise sources using sound

66 pressure – Survey method using an enveloping measurement surface over a reflecting plane

67 ISO 3747, Acoustics – Determination of sound power levels of noise sources using sound

68 pressure – Comparison method in situ

69 ISO 4871, Acoustics – Declaration and verification of noise emission values of machinery and

70 equipment

71 ISO 9614-1, Acoustics – Determination of sound power levels of noise sources using sound

72 intensity – Part 1: Measurement at discrete points

73 ISO 9614-2, Acoustics – Determination of sound power levels of noise sources using sound

74 intensity – Part 2: Measurement by scanning
75 3 Terms and definitions

76 For the purposes of this document, the terms and definitions given in the standards listed in

77 the normative references together with the following apply.
78 3.1
79 sound power level
80 L

81 ten times the logarithm to the base 10 of the ratio of the sound power radiated by the source

–12

82 under test to the reference sound power [W = 1 pW (10 W)] expressed in decibels

83 3.2
84 sound pressure level
85 L

86 ten times the logarithm to the base 10 of the ratio of the square of the sound pressure to the

87 square of the reference sound pressure [P = 20 µPa (2 × 10 Pa)] expressed in decibels

88 3.3
89 measurement surface index
90 L

91 ten times the logarithm to the base 10 of the ratio of the measurement surface S to the

92 reference surface S0 [m ] expressed in decibels
---------------------- Page: 9 ----------------------
oSIST prEN IEC 60034-9:2021
– 8 – IEC CDV 60034-9  IEC 2021
94 3.4
95 maximum value
96 is the value that defines the upper limit without further tolerance
---------------------- Page: 10 ----------------------
oSIST prEN IEC 60034-9:2021
IEC CDV 60034-9  IEC 2021 – 9 –
99 4 Methods of measurement

100 4.1 Sound pressure level measurements and calculation of sound power level produced by

101 the machine shall be made in accordance with ISO 3744, unless one of the alternative

102 methods specified in 4.3 or 4.4 below applies.

103 NOTE It is general practice to use the parallelepiped method for all shaft heights.

104 4.2 The maximum sound power levels specified in Tables 1 and 2 or adjusted by Table 3,

105 relate to measurements made in accordance with 4.1.

106 4.3 When appropriate, one of the methods of precision or engineering grade accuracy, such

107 as the methods of ISO 3741, ISO 3743-1, ISO 3743-2, ISO 3745, ISO 9614-1 or ISO 9614-2,

108 may be used to determine sound power levels.

109 4.4 The simpler but less accurate method specified in ISO 3746 or ISO 3747 may be used,

110 especially when the environmental conditions required by ISO 3744 cannot be satisfied (for

111 example, for large machines).

112 However, to prove compliance with this standard, unless a correction due to inaccuracy of the

113 measurement has already been applied to the values determined by this method in

114 accordance with ISO 3746 or ISO 3747, the levels of Tables 1 and 2 shall be decreased by 2

115 dB.

116 4.5 If testing under rated load conditions, the methods of ISO 9614 are preferred. However,

117 other methods are allowed when the load machine and auxiliary equipment are acoustically

118 isolated or located outside the test environment.
119 5 Test conditions
120 5.1
...