oSIST prEN IEC 60704-2-21:2026

• Status: Not Published
• Public Enquiry End Date: 29-Oct-2026
• ICS: 97.040.50 - Small kitchen appliances
• Technical Committee: FGA - Consumer information related to household electrical appliances
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 14-Aug-2026
• Due Date: 01-Jan-2027
• Ref Project: prEN IEC 60704-2-21:2026 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-21: Particular requirements for coffee preparation appliances

oSIST prEN IEC 60704-2-21:2026 is a SIST standard identical to prEN IEC 60704-2-21:2026. It gives particular requirements for measuring airborne acoustical noise from household and similar coffee preparation appliances. The document is used with IEC 60704-1:2021 and is written for anyone who needs repeatable noise measurements for these appliances.

What does oSIST prEN IEC 60704-2-21:2026 specify?

oSIST prEN IEC 60704-2-21:2026 specifies how to measure and report airborne acoustical noise from coffee preparation appliances for household use and similar use. It supplements the general test code in IEC 60704-1:2021 with appliance-specific preparation, operating conditions, and measurement details.

The scope covers, for example:

• automatic coffee machines
• coffee grinders
• porta filter coffee machines
• pad coffee machines
• capsule coffee machines
• filter coffee machines

The document does not apply to professional appliances for commercial use or to coffee vending machines. Its structure follows the usual IEC layout: scope, normative references, terms and definitions, measurement methods and acoustical environments, operation and location of appliances under test, measurement of sound power levels, information to be recorded, and a normative Annex A.

Annex	What it covers
Annex A	Marked as not applicable in this part

What are the key requirements of oSIST prEN IEC 60704-2-21:2026?

Test basis and measurement method

oSIST prEN IEC 60704-2-21:2026 is used together with IEC 60704-1:2021. Where this part adds, modifies, or replaces text, the coffee-appliance-specific rules apply; otherwise the general part applies as far as reasonable. In practice, that means users should start from the general acoustic test code and then apply the special conditions for coffee appliances.

Clause 4 keeps both the direct method and the comparison method, but it adds guidance for sources with audible discrete tones. When such tones are present, extra microphone positions or source positions may be needed, as indicated by ISO 3743-1 or ISO 3743-2. This matters because tonal noise can change the measured spread of results between laboratories.

Clause 4.5 gives the standard deviations used for repeatability, reproducibility, declaration, and verification. Table 1 covers sound power levels for the main functions and the whole cycle, while Table 2 gives the values used for declaration and verification under IEC 60704-3.

Preparing the appliance for test

Clause 6 requires the appliance to be equipped with full water, bean, and milk containers, if those parts are available. A beverage that uses all available main functions shall be selected, and cappuccino is preferred when it is available. Default settings are restored with the reset function, or else the settings are set according to the specified defaults.

The test conditions also control the materials used. Coffee beans are to be 100% Arabica, medium roasted, and preconditioned for at least 24 hours. For milk frothing, ultra-heat treated (U.H.T.) milk with the stated fat range is used and stored under controlled conditions. This matters because the test is intended to compare appliances, not ingredients.

Running the appliance and taking the measurements

Before noise measurements, the appliance is run in for the stated number of cups or equivalent operations. Coffee grinders have their own running-in requirement, and coffee percolators and filter coffee machines have a separate one. If decalcification is needed, it is done according to the manufacturer’s instructions.

Clause 6 also says that noise shall be measured and reported for all available main functions and for the whole operational cycle. User interaction noise is excluded. The operator, if required, must not stand directly between the appliance and any microphone position.

Clause 7 specifies what is measured:

• the A-weighted sound pressure level during the whole beverage-making cycle
• the time-averaged level for each main function
• the maximum A-weighted sound pressure level with slow time weighting during the whole cycle

It also gives function-specific averaging times for grinding, brewing, filter coffee machines and coffee percolators, and milk frothing. For manual milk frothing, the process is stopped after 30 s. The practical effect is that the measured value reflects the noisiest relevant part of the process in a repeatable way.

Test setup and reporting

Clause 6 says the standard test table shall not be used, and the test enclosure is placed in accordance with the location rules in this part. The dripping sound into the cup is excluded by adjusting the outlet height and, if needed, using cheesecloth in the cup. That keeps the result focused on the appliance rather than the receiving vessel.

Clause 9 requires the test report to record the kind and amount of coffee, the type of capsule or pad, the type of filter holder, and the beverage amount where relevant. This information lets others reproduce the test conditions and compare results correctly.

What terms does oSIST prEN IEC 60704-2-21:2026 define?

• coffee preparation appliance - an appliance used to prepare coffee.
• automatic coffee machine - a machine that carries out grinding, brewing, milk frothing, or similar beverage phases with little operator intervention.
• coffee grinder - an appliance only for grinding coffee beans.
• porta filter coffee machine - a manual espresso coffee maker where the filter is filled with ground coffee and attached by manual operation.
• pad coffee machine - a coffee maker that uses prepackaged brewing media in a permeable container.
• capsule coffee machine - a coffee maker that uses prepackaged brewing media in a non-permeable container that must be punctured for brewing.
• main function - at least one of grinding, brewing, and milk frothing.

Who uses oSIST prEN IEC 60704-2-21:2026?

oSIST prEN IEC 60704-2-21:2026 is used by manufacturers of coffee preparation appliances, acoustic test laboratories, and conformity assessment teams. Quality managers and product engineers use it to set up comparable noise tests, choose operating conditions, and document the results. Buyers and specifiers can also use it to compare noise claims for household coffee machines and grinders.

Which standards are used with oSIST prEN IEC 60704-2-21:2026?

Standard	Contribution
IEC 60704-1:2021	General test code that this part supplements and modifies.
IEC 60704-3	Used for declaration and verification of noise emission values with the standard deviations in Table 2.
IEC 60661:1999+AMD1:2003+AMD2:2005 CSV	Cited for the performance-measurement background and for the source of some defined terms.
ISO 3743-1	Provides additional microphone or source positions when discrete tones affect the comparison method.
ISO 3743-2	Provides additional microphone or source positions when discrete tones affect the direct method.
ISO 9614-1, ISO 9614-2, ISO 9614-3	Stated as not applicable to coffee preparation appliances in this document.

What does the oSIST prEN IEC 60704-2-21:2026 document contain?

This document contains the appliance-specific noise test code for coffee preparation appliances, built on the general IEC 60704-1 framework. It includes the scope, the definitions of the coffee appliance types and main functions, and the measurement rules for direct and comparison methods. It also gives the operating conditions for filling, preconditioning, run-in, and test execution, so different laboratories test the appliance in the same way.

The document includes Table 1 and Table 2 for standard deviations, plus the reporting items that must be recorded for each test. Clause 7 describes how to measure the A-weighted sound pressure level for the whole cycle and for each main function, and how to determine the maximum slow-weighted level. Annex A is present as a normative annex and is marked not applicable in this part.

SLOVENSKI STANDARD
01-oktober-2026
Gospodinjski in podobni električni aparati - Postopek preskušanja za ugotavljanje
zvočnega hrupa v zraku - 2-21. del: Posebne zahteve za aparate za pripravo kave
Household and similar electrical appliances - Test code for the determination of airborne
acoustical noise - Part 2-21: Particular requirements for coffee preparation appliances
Ta slovenski standard je istoveten z: prEN IEC 60704-2-21:2026
ICS:
97.040.50 Majhni gospodinjski aparati Small kitchen appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

59L/315/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 60704-2-21 ED1
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-08-07 2026-10-30
SUPERSEDES DOCUMENTS:
59L/262/CD, 59L/276/CC
IEC SC 59L : SMALL HOUSEHOLD APPLIANCES
SECRETARIAT: SECRETARY:
Italy Mr Davide Pietrosemoli
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

ASPECTS CONCERNED:
Environment
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 t hey
are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some Countries”
clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is the final stage for
submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Household and similar electrical appliances - Test code for the determination of airborne acoustical
noise - Part 2-21: Particular requirements for coffee preparation appliances

PROPOSED STABILITY DATE: 2030
NOTE FROM TC/SC OFFICERS:
electronic file, to make a copy and to print out the content for the sole purpose of preparing National Committee positions.
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IEC CDV 60704-2-21 © IEC 2026
1 CONTENTS
3 FOREWORD . 3
4 INTRODUCTION . 5
5 1 Scope . 6
6 2 Normative references . 6
7 3 Terms and definitions . 6
8 4 Measurement methods and acoustical environments . 8
9 6 Operation and location of appliances under test . 9
10 7 Measurement of sound power levels . 11
11 9 Information to be recorded . 12
12 Annex A (normative). 13
14 Table 1 – Standard deviations of sound power levels . 8
15 Table 2 – Standard deviations for declaration and verification . 9
IEC CDV 60704-2-21 © IEC 2026
18 INTERNATIONAL ELECTROTECHNICAL COMMISSION
19 ____________
21 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
22 TEST CODE FOR THE DETERMINATION OF AIRBORNE
23 ACOUSTICAL NOISE –
25 Part 2-21: Particular requirements for coffee preparation appliances
27 FOREWORD
28 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national
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54 8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable
55 for the correct application of this publication.
56 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights.
57 IEC shall not be held responsible for identifying any or all such patent rights.
58 IEC 60704-2-21 has been prepared by subcommittee 59L: Small household appliances, of IEC technical
59 committee 59: Performance of household and similar electrical appliances. It is an International
60 Standard.
61 The text of this International Standard is based on the following documents:
Draft Report on voting
59L/XX/xxx 59L/XX/xx
63 Full information on the voting for its approval can be found in the report on voting indicated in the above
64 table.
65 The language used for the development of this International Standard is English.
66 This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in accordance
67 with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available at
IEC CDV 60704-2-21 © IEC 2026
68 www.iec.ch/members_experts/refdocs. The main document types developed by IEC are described in
69 greater detail at www.iec.ch/publications.
70 This International Standard is to be used in conjunction with IEC 60704-1:2021.
71 This document supplements or modifies the corresponding clauses in IEC 60704-1:2021, so as to
72 establish the test code for coffee preparation appliances. When a particular subclause of
73 IEC 60704‑1:2021 is not mentioned in this document, that subclause is applicable as far as reasonable.
74 Where this standard states "addition", "modification" or "replacement", the relevant requirements, test
75 specifications or explanatory matter in IEC 60704‑1:2021 are to be adapted accordingly.
76 Subclauses, tables and figures that are numbered starting from 101 are additional to those in
77 IEC 60704‑1:2021. Additional annexes are lettered AA, BB, etc.
78 Unless notes are in a new subclause or involve notes in IEC 60704‑1:2021, they are numbered starting
79 from 101, including those in a replaced clause or subclause.
80 In this standard, the following print types are used:
81 • terms defined in Clause 3: bold type
82 A list of all parts in the IEC 60704 series, published under the general title Household and similar
83 electrical appliances – Test code for the determination of airborne acoustical noise, can be found on
84 the IEC website.
85 The committee has decided that the contents of this document will remain unchanged until the stability
86 date indicated on the IEC website under webstore.iec.ch in the data related to the specific document.
87 At this date, the document will be
88 • reconfirmed,
89 • withdrawn,
90 • replaced by a revised edition, or
91 • amended.
IEC CDV 60704-2-21 © IEC 2026
94 INTRODUCTION
95 The measuring conditions specified in this document provide for sufficient accuracy in determining the
96 noise emitted and comparing the results of measurements taken by different laboratories, whilst
97 simulating as far as possible the practical use of coffee preparation appliances in household kitchens.
98 It is recommended to consider the determination of noise levels as part of a comprehensive testing
99 procedure covering many aspects of the properties and performance of coffee preparation appliances.
100 NOTE As stated in the introduction to IEC 60704-1:2021, this test code is concerned with airborne noise only.
IEC CDV 60704-2-21 © IEC 2026
103 HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
104 TEST CODE FOR THE DETERMINATION OF AIRBORNE
105 ACOUSTICAL NOISE –
107 Part 2-21: Particular requirements for coffee preparation appliances
111 1 Scope
112 Addition:
113 These particular requirements apply to coffee preparation appliances for household use and similar use.
114 Examples are included but are not limited to following:
115 • automatic coffee machines
116 • coffee grinders
117 • porta filter coffee machines
118 • pad coffee machines
119 • capsule coffee machines
120 • filter coffee machines
121 This document does not apply to professional appliances for commercial use and coffee vending
122 machines.
123 2 Normative references
124 Modification:
125 The standards ISO 9614-1, -2 and -3 are not applicable on coffee preparation appliances.
126 Addition:
127 IEC 60661:1999+AMD1:2003+AMD2:2005 CSV - Methods for measuring the performance of electric
128 household coffee makers
129 3 Terms and definitions
130 Addition:
131 3.101
132 coffee preparation appliance
133 appliance to pr
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