IEC 60335-2-42:2021

Household and similar electrical appliances - Safety - Part 2-42: Particular requirements for commercial electric forced convection ovens, steam cookers and steam-convection ovens

IEC 60335-2-42:2021 deals with the safety of electrically operated commercial forced convection ovens, steam cookers, steam-convection ovens and, exclusive of any other use, steam generators, their rated voltage being not more than 250 V for single-phase appliances connected between one phase and neutral and 480 V for other appliances. These appliances are not intended for household and similar purposes. They are used for commercial processing of food in areas not open to the public, for example in kitchens of restaurants, canteens, hospitals and in commercial enterprises such as bakeries and butcheries. This standard deals also with electrically operated commercial forced convection ovens, steam cookers, steam-convection ovens intended for use on board ships, for which informative Annex AA is applicable.
The electrical part of appliances making use of other forms of energy is also within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by these types of appliances. Attention is drawn to the fact that:
- for appliances intended to be used in vehicles or on board ships or aircrafts, additional requirements can be necessary;
- in many countries additional requirements are specified by the national health authorities, the national authorities responsible for the protection of labour, the national water supply authorities and similar authorities;
- in many countries additional requirements are specified for pressure appliances.
This standard does not apply to:
- appliances designed exclusively for industrial purposes;
- appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
- appliances for continuous mass production of food;
- microwave ovens (IEC 60335-2-90);
- battery-operated appliances.
This sixth edition cancels and replaces the fifth edition published in 2002, Amendment 1: 2008 and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text, modified or deleted (Clause 1, 7.15, 9.101, 10.1, 11.7, 19.2, 19.7, 20.101, 21.101, 22.101, 22.114, 27.2, 30.101);
c) exclusion of battery-operated appliances and appliances used in areas open to the public (Clause 1);
d) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
e) relocation of cleaning instructions from 7.12.1 to 7.12;
f) clarifications to some test specifications have been made (15.1.1, 15.2, 19.2, 19.7, 23.3, 25.3);
g) introduction of a symbol to indicate risk of scalding (7.6);
h) conciliation of the text of IEC 60335-2-42 with other standards under IEC TC 61/MT 32.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its amendments unless that edition precludes it; in that case, the latest edition that does not preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.

Appareils électrodomestiques et analogues - sécurité - Partie 2-42: Exigences particulières pour les fours à convection forcée, les cuiseurs à vapeur et les fours combinés vapeur-convection électriques à usage commercial

L'IEC 60335-2-42:2021 traite de la sécurité des fours à convection forcée, cuiseurs à vapeur, fours combinés vapeur-convection électriques à usage commercial et, à l'exclusion de toute autre utilisation, des générateurs de vapeur, dont la tension assignée est inférieure ou égale à 250 V pour les appareils monophasés raccordés entre un conducteur de phase et le conducteur de neutre et à 480 V pour les autres appareils. Ces appareils ne sont pas destinés à un usage domestique ou analogue. Ils sont destinés à un usage commercial pour le traitement des aliments dans des zones non ouvertes au public, par exemple dans les cuisines de restaurants, les cantines, les hôpitaux et les entreprises commerciales, telles que les boulangeries et les boucheries. La présente norme traite également des fours à convection forcée, des cuiseurs à vapeur et des fours combinés vapeur-convection destinés à être utilisés à bord de navires, pour lesquels l'Annexe AA informative s'applique. La partie électrique des appareils qui utilise d'autres formes d'énergie est également comprise dans le domaine d'application de la présente norme. Dans la mesure du possible, la présente norme traite des dangers courants que présentent ces types d'appareils. L'attention est attirée sur le fait que:
- pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d'avions, des exigences supplémentaires peuvent être nécessaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées par les organismes nationaux de la santé, par les organismes nationaux responsables de la protection des travailleurs, par les organismes nationaux responsables de l'alimentation en eau et par des organismes similaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées pour les appareils sous pression.
La présente norme ne s'applique pas:
- aux appareils prévus exclusivement pour des usages industriels;
- aux appareils destinés à être utilisés dans des locaux qui présentent des conditions particulières, telles que la présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz);
- aux appareils conçus pour la production continue en masse d'aliments;
- aux fours à micro-ondes (IEC 60335-2-90);
- aux appareils alimentés par batteries.
Cette sixième édition annule et remplace la cinquième édition parue en 2002, l'Amendement 1:2008 et l'Amendement 2:2017. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) alignement du texte sur l'IEC 60335-1:2020;
b) conversion en texte normatif, modification ou suppression de certaines notes (Article 1, 7.15, 9.101, 10.1, 11.7, 19.2, 19.7, 20.101, 21.101, 22.101, 22.114, 27.2, 30.101);
c) exclusion des appareils alimentés par batteries et des appareils utilisés dans des lieux ouverts au public (Article 1);
d) clarification de la norme applicable aux appareils destinés à être utilisés par des usagers non avertis (Article 1, 7.12);
e) déplacement des instructions pour le nettoyage du 7.12.1 au 7.12;
f) clarification de certaines modalités d'essai (15.1.1, 15.2, 19.2, 19.7, 23.3, 25.3);
g) ajout d'un symbole pour indiquer le risque de brûlure (7.6);
h) alignement du texte de l'IEC 60335-2-42 sur d'autres normes sous l'IEC/TC61/MT32.
La présente Partie 2 doit être utilisée conjointement avec la dernière édition de l'IEC 60335-1 et ses amendements, sauf si cette édition l'exclut. Dans ce cas, la dernière édition qui n'exclut pas la présente Partie 2 est utilisée. Elle a été établie sur la base de la sixième édition (2020) de cette norme.

General Information

• Status: Published
• Publication Date: 09-Feb-2025
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: TC 61 - Safety of household and similar electrical appliances
• Drafting Committee: MT 32 - TC 61/MT 32
• Current Stage: PPUB - Publication issued
• Start Date: 05-Nov-2021
• Completion Date: 26-Nov-2021

Relations

• Amended By: IEC 60335-2-42:2021/AMD1:2025 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-42: Particular requirements for commercial electric forced convection ovens, steam cookers and steam-convection ovens
• Effective Date: 26-Apr-2024
• Revises: IEC 60335-2-42:2002/AMD2:2017 - Amendment 2 - Household and similar electrical appliances - Safety - Part 2-42: Particular requirements for commercial electric forced convection ovens, steam cookers and steam-convection ovens
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-42:2002/AMD1:2008 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-42: Particular requirements for commercial electric forced convection ovens, steam cookers and steam-convection ovens
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-42:2002 - Household and similar electrical appliances - Safety - Part 2-42: Particular requirements for commercial electric forced convection ovens, steam cookers and steam-convection ovens
• Effective Date: 05-Sep-2023

Overview

IEC 60335-2-42:2021 is the IEC safety standard for electrically operated commercial forced convection ovens, steam cookers and steam‑convection ovens (including, exclusively, electrically operated steam generators). It applies to non‑household appliances used for commercial food processing (restaurants, canteens, hospitals, bakeries, butcheries) and covers appliances with rated voltages up to 250 V for single‑phase phase‑to‑neutral and 480 V for other appliances. This sixth edition (2021) is a technical revision aligned with IEC 60335-1:2020 and introduces updates such as a symbol for scalding risk and clarified test specifications.

Key topics and technical requirements

IEC 60335-2-42 supplements Part 1 (IEC 60335-1) and addresses hazards and tests specific to commercial ovens and steam equipment. Major technical topics include:

• Electrical safety and leakage current testing and electric strength at operating temperature.
• Heating and temperature control: surface temperature limits, thermal protection and prevention of scalding (new scalding symbol introduced).
• Moisture resistance and steam exposure: tests for steam cookers and steam‑convection ovens.
• Abnormal operation and endurance: fault‑condition tests and mechanical/thermal endurance requirements.
• Construction and mechanical strength: enclosure integrity, moving parts, stability and protection against mechanical hazards.
• Internal wiring, components and earthing: requirements for terminals, external cords and earthing continuity.
• Resistance to heat, fire and corrosion, plus requirements for radiation and toxicity where applicable.
• Marking and instructions for safe installation, cleaning, maintenance and intended use (cleaning instructions relocated and clarified).
• Special conditions: informative Annex AA for appliances intended for use on board ships.

Note: the standard excludes household appliances, battery‑operated units, appliances for continuous mass production, and equipment for corrosive/explosive atmospheres.

Practical applications - who uses IEC 60335-2-42

• Manufacturers and product designers of commercial ovens and steam cooking equipment - for design compliance, safety features and documentation.
• Test laboratories and certification bodies - for type testing, conformity assessment and issuing certificates/marks.
• Compliance engineers and safety officers - to verify leakage, temperature, endurance and construction tests.
• Procurement and facility managers in commercial kitchens, hospitals and catering - to specify equipment meeting international safety norms.
• Regulators and inspection authorities - to adopt or reference national requirements and harmonize with IEC guidance.

Related standards

• IEC 60335-1 - General requirements for household and similar electrical appliances (must be used with Part 2-42).
• IEC 60335-2-90 - Microwave ovens (excluded from Part 2-42).
• IEC 60364 - Electrical installation rules considered where applicable.
• Other IEC/TC 61 documents and national health, pressure‑vessel and occupational safety regulations may add requirements.

IEC 60335-2-42 helps manufacturers and testing bodies ensure electrical and thermal safety of commercial convection and steam cooking equipment, supporting safer commercial food service operations and regulatory compliance.

Standards Content (Sample)

IEC 60335-2-42 ®
Edition 6.1 2025-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-42: Particular requirements for commercial electric forced convection
ovens, steam cookers and steam-convection ovens

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IEC 60335-2-42 ®
Edition 6.1 2025-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-42: Particular requirements for commercial electric forced convection
ovens, steam cookers and steam-convection ovens
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.20 ISBN 978-2-8327-0221-5
REDLINE VERSION – 2 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 12
5 General conditions for the tests . 12
6 Classification . 12
7 Marking and instructions . 12
8 Protection against access to live parts . 15
9 Starting of motor-operated appliances . 15
10 Power input and current . 15
11 Heating . 16
12 Charging of metal-ion batteries . 18
13 Leakage current and electric strength at operating temperature . 18
14 Transient overvoltages . 18
15 Moisture resistance . 18
16 Leakage current and electric strength . 19
17 Overload protection of transformers and associated circuits . 20
18 Endurance . 20
19 Abnormal operation . 20
20 Stability and mechanical hazards . 21
21 Mechanical strength . 23
22 Construction . 23
23 Internal wiring . 26
24 Components . 27
25 Supply connection and external flexible cords . 27
26 Terminals for external conductors . 27
27 Provision for earthing . 27
28 Screws and connections . 28
29 Clearances, creepage distances and solid insulation . 28
30 Resistance to heat and fire . 29
31 Resistance to rusting . 29
32 Radiation, toxicity and similar hazards . 29
Annexes . 33
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances .
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 35
Annex AA (informative) Appliances intended to be used on board ships . 36
Bibliography . 38

© IEC 2025
Figure 101 – Probe for measuring surface temperatures . 29
Figure 102 – Adjacent surfaces which are not measured. 30
Figure 103 – Identification of surfaces for temperature measurement . 31
Figure 104 – Splash apparatus . 32

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 17
Table 102 – Assembling torques for screwed connections providing earthing continuity . 28

REDLINE VERSION – 4 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

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,
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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
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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
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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
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60335-2-42 edition 6.1 contains the sixth edition (2021-11) [documents 61/6366/FDIS
and 61/6416/RVD] and its amendment 1 (2025-02) [documents 61/7240/CDV and
61/7353/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red
text. A separate Final version with all changes accepted is available in this publication.

© IEC 2025
IEC 60335-2-42 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This sixth edition cancels and replaces the fifth edition published in 2002, Amendment 1: 2008
and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text, modified or deleted (Clause 1, 7.15,
9.101, 10.1, 11.7, 19.2, 19.7, 20.101, 21.101, 22.101, 22.114, 27.2, 30.101);
c) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
d) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
e) relocation of cleaning instructions from 7.12.1 to 7.12;
f) clarifications to some test specifications have been made (15.1.1, 15.2, 19.2, 19.7, 23.3,
25.3);
g) introduction of a symbol to indicate risk of scalding (7.6);
h) conciliation of the text of IEC 60335-2-42 with other standards under IEC/TC61/MT32.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
REDLINE VERSION – 6 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class 01 appliances are allowed (Japan).
– 13.2: Leakage current limits are different (Japan).
– 16.2: Leakage current limits are different (Japan).

© IEC 2025
INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website:
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods for measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

REDLINE VERSION – 8 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electrically operated commercial forced
convection ovens, steam cookers, steam-convection ovens and, exclusive of any other use,
steam generators, their rated voltage being not more than 250 V for single-phase appliances
connected between one phase and neutral and 480 V for other appliances, including direct
current (DC) supplied appliances.
These appliances are not intended for household and similar purposes. They are used for
commercial processing of food in areas not open to the public, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries and
butcheries.
This standard deals also with electrically operated commercial forced convection ovens,
steam cookers, steam-convection ovens intended for use on board ships, for which
informative Annex AA is applicable.
The electrical part of appliances making use of other forms of energy is also within the scope
of this standard.
As far as is practicable, this standard deals with the common hazards presented by these types
of appliances.
Attention is drawn to the fact that:
– for appliances intended to be used in vehicles or on board ships or aircrafts, additional
requirements can be necessary;
– in many countries additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour, the national water supply
authorities and similar authorities;
– in many countries additional requirements are specified for pressure appliances.
This standard does not apply to:
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;
– microwave ovens (IEC 60335-2-90);.
– battery-operated appliances.

© IEC 2025
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-52:2017, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1:
Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread
ISO 3506-1, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 1: Bolts, screws and studs with specified grade and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grade and property classes
ISO 3506-3, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set
screws and similar fasteners not under tensile stress
ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 4:
Tapping screws
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.4 Addition:
Note 101 to entry: The rated power input is the sum of the power inputs of all the individual elements in the
appliance that can be on at one time; where there are several such combinations possible, that giving the highest
power input is used in determining the rated power input.
3.1.9 Replacement:
Modification:
Replace the first paragraph with the following:
operation of the appliance under the conditions specified in 3.1.9.101 to 3.1.9.103, as
applicable.
Motors and detachable electrical parts incorporated in the appliance are operated under the
most unfavourable conditions that can be expected in normal use taking into account the
manufacturer's instructions.
3.1.9.101 For dry heat mode, the appliance is operated with all the shelves or the shelf trolley
in position according to the manufacturer's instructions but with no load. The controls are set
so that the mean value of the temperature over the thermostat cycle at the geometric centre

REDLINE VERSION – 10 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
of each usable space in the interior of the oven is maintained at 220 °C ± 4 °C. Stepped controls
are set so that this temperature is 220 °C ± 15 °C.
For ovens that are unable to attain a temperature of 220 °C, the controls are set at the
maximum.
For ovens that are capable of attaining temperatures in excess of 270 °C, the controls are set
so that the mean value of the temperature is 50 °C ± 4 °C below the maximum temperature
attainable.
3.1.9.102 For steaming only mode, the appliance is operated in accordance with the
manufacturer's instructions with all controls intended to be operated by the user adjusted to
their maximum setting until reaching operating temperature. They are then readjusted, if
possible, to the lowest setting that maintains that temperature.
Appliances with steam generators intended to be filled by hand or by a manually operated tap
are filled to the indicated level on the steam generator.
Appliances with steam generators intended to be filled automatically are connected to a water
supply having the maximum pressure indicated by the manufacturer. Where the manufacturer
specifies a range of pressures, the pressure is adjusted to give the most unfavourable
conditions.
The incoming water is maintained at:
– 15 °C ± 5 °C in the case of appliances intended for connection to a cold water supply;
– 60 °C ± 5 °C or the temperature indicated in the instruction sheet, whichever is the higher,
in the case of appliances intended for connection to a hot water supply only.
If the appliance is intended for connection to either a hot or cold water supply, the temperature
of the water is that which gives the most unfavourable results.
Lids, doors, and covers are in position and closed.
The cooking compartment of the appliance contains a water load, initially at 15 °C ± 5 °C,
comprising 0,5 l/kg of the manufacturer's declared maximum food load. The water load is evenly
distributed between the shelves or pans. Since pans may be perforated to allow for circulation
of steam, the water load may be contained in suitable containers evenly distributed over the
shelves or pans.
3.1.9.103 For combination mode, the appliance is operated as for the steaming only mode,
but with the forced convection fan/s and elements for heating the cooking compartment on
and the temperature controls set as for the dry heat mode.
3.1.101
rated pressure
maximum working pressure of steam cookers and steam generators assigned by the
manufacturer to the pressurized parts of the appliance
3.5 Definitions relating to types of appliances
3.5.101
forced convection oven
appliance intended for the cooking of food by heated air that is circulated by mechanical means
within the cooking compartment
Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
© IEC 2025
3.5.102
steam cooker
appliance intended for the cooking of food only by means of direct steam contact
Note 1 to entry: The pressure within the cooking compartment can exceed atmospheric pressure.
3.5.103
atmospheric steam cooker
appliance in which the pressure within the cooking compartment does not differ significantly
from atmospheric pressure
3.5.104
steam-convection oven
appliance intended for the cooking of food either by means of direct steam contact or by heated
air circulated by mechanical means within the cooking compartment or by a combination of
these two modes
Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
3.6 Definitions relating to parts of an appliance
3.6.101
steam generator
that part of the appliance designed specifically for the generation of steam for exclusive use in
a cooking compartment
Note 1 to entry: The steam generator may be either combined within the cooking compartment, remote from the
cooking compartment, but contained within the same casing, or function as a separate unit providing steam for one
or more cooking compartments.
3.6.102
cooking compartment
that part of the appliance in which the cooking or food heating process takes place
3.6.103
functional surface
surface that is intentionally heated by an internal heat source and has to be hot to carry out the
function for which the appliance is intended
Note 1 to entry: An example is the heated sheath of a tubular heating element.
3.6.104
adjacent surface
surface that is adjacent to a functional surface and which can become hot through conduction
3.8 Definitions relating to miscellaneous matters
3.8.101
indicated level
mark on the appliance or steam generator to indicate the maximum liquid level for correct
operation
3.8.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
REDLINE VERSION – 12 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.10 Addition:
Appliances intended for installation in a bank of other appliances and appliances intended to
be fixed to an installation wall are enclosed to obtain protection against electric shock and
harmful ingress of water equivalent to that obtained when installed in accordance with the
instructions provided with the appliance.
NOTE Appropriate enclosures or additional appliances can be needed for test purposes.
5.101 Appliances are tested as heating appliances, when during a mode of operation
electrical heaters are energized. If no electrical heaters are energized, the appliances are tested
as motor-operated appliances.
5.102 Appliances, when assembled in combination with or incorporating other appliances, are
tested in accordance with the requirements of this standard. The other appliances are operated
simultaneously in accordance with the requirements of the relevant standards.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
Unless the instructions include the statement to install the appliance and shelf trolley less than
1,6 m above the floor, the appliance and shelf trolley shall be marked with the risk of scalding
symbol on the front surface.
© IEC 2025
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 and for which the provisions of footnote b to Table 101 apply, then the appliance
shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041 (2002-10)] caution, hot surface

risk of scalding
NOTE 101 The “Risk of scalding” symbol incorporates symbol IEC 60417-6418 (2020-06) combined with the
warning sign of ISO 3864-1.
7.12 Addition:
The instructions of steam cookers and steam-convection ovens shall also include information
with regard to the maximum food load in kilograms (kg).
The instructions of steam cookers shall include the substance of the following warning:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
Instructions for user maintenance, for example cleaning, shall also be given. They shall include
a statement that the appliance is not to be cleaned with a water jet or a steam cleaner.
If any of symbols IEC 60417-5021 (2002-10) or IEC 60417-5041 (2002-10) or the risk of
scalding symbol are marked on the appliance, its meaning shall be explained.
If the risk of scalding symbol is required to be marked in 7.1, but the appliance is not marked,
the label with the symbol shall be supplied with the appliance and the instructions shall state
that the label shall be affixed on the front surface after the installation at a height of 1,6 m or
higher above the floor.
The instructions shall include the substance of the following warning:
WARNING: To avoid scalding, do not use loaded containers with liquids or cooking goods
that become fluid by heating in shelves positioned at levels higher than 1,6 m
above the floor.
The instructions of steam cookers and steam-convection ovens shall include the substance
of the following warning:
WARNING: When opening the door of the cooking compartment, hot steam can come out.
The instructions shall include the substance of the following:
These appliances are intended to be used for commercial applications, for example in
kitchens of restaurants, canteens, hospitals and in commercial enterprises such as
bakeries, butcheries, etc., but not for continuous mass production of food.

REDLINE VERSION – 14 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
If the manufacturer wants to limit the use of the appliance to less than the above, this shall be
clearly stated in the instructions.
If the shelves support have a “L-shape”, the instructions shall inform the user on the fact that
these shelves are not suitable for the use with containers with liquids or for cooking processes
which can generate liquids.
Modification:
The instruction concerning persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge and children playing with the appliance
is not applicable.
7.12.1 Addition:
The appliance shall be accompanied by instructions detailing any special precautions
necessary for installation. For appliances intended for installation in a bank of other appliances
and appliances intended to be fixed to an installation wall, details of how to ensure appropriate
protection against electric shock and harmful ingress of water shall be supplied. If the controls
of more than one appliance are combined in a separate enclosure, detailed installation
instructions shall be supplied.
For appliances that are permanently connected to fixed wiring and for which leakage currents
can exceed 10 mA, particularly if disconnected or not used for long periods, or during initial
installation, the instructions shall give recommendations regarding the rating of protective
devices, such as residual current devices (RCD), to be installed.
Compliance is checked by inspection.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle in symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
The height of risk of scalding symbol shall be at least 30 mm.
NOTE 101 The risk of scalding symbol at the trolley can be etched or stamped; in this case the size can be reduced.
7.15 Addition:
The marking specified for external accessible surfaces shall be visible when the appliance is
operated as in normal use, including when actuating any switch, adjusting any control or
opening a lid or door. It shall not be placed on a functional surface or adjacent surface.
Modification:
For fixed appliances, the marking of the name or trademark or identification mark of the
manufacturer or responsible vendor and the model or type reference shall be marked on the
appliance and, if not visible when the appliance is installed as in normal use, shall be included
in the instructions or on an additional label that can be fixed near the appliance after installation.

© IEC 2025
7.101 Appliances and steam generators intended to be filled by hand or by a manually
operated tap shall be marked with an indicated level.
Compliance is checked by inspection.
7.102 Equipotential bonding terminals shall be marked with symbol IEC 60417-5021
(2002-10).
These markings shall not be placed on screws, removable washers or other parts that can be
removed when conductors are being connected.
Compliance is checked by inspection.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is applicable except as follows.
9.101 Fan motors providing a cooling effect in order to comply with the requirements of Clause
11 shall start under all voltage conditions that can occur in use. The requirement is not
applicable to the fan motor of a convection fan.
Compliance is checked by the following tests using a supply source such that its drop in voltage
does not exceed 1 % during the tests. The appliance being returned to room temperature after
each test.
The appliance is started under the conditions occurring at the beginning of normal operation
or, for automatic appliances, at the beginning of the normal cycle of operation, a voltage equal
to 0,85 times rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protective devices of the motor shall not operate.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
For appliances having more than one heating unit, the total power input may be determined by
measuring the power input of each heating unit separately (see also 3.1.4).

REDLINE VERSION – 16 – IEC 60335-2-42:2021+AMD1:2025 CSV
© IEC 2025
11 Heating
This clause of Part 1 is applicable except as follows.
11.2 Addition:
Appliances intended to be fixed to the floor and appliances with a mass greater than 40 kg and
not provided with rollers, castors or similar means are installed in accordance with the
manufacturer's instructions. If no instructions are given, these appliances are considered as
appliances normally placed on the floor.
Separate cooking compartments and steam generators are assembled in accordance with
the manufacturer's instructions and located in the test corner in such a manner that they will
have the most unfavourable effect on each other and on their surroundings.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe may be used.
11.4 Replacement:
Appliances are operated under normal operation such that the total power input of the
appliance is 1,15 times rated power input. If it is not possible to switch on all heating elements
at the same time, the test is made with each of the combinations that the switch arrangement
will allow, the highest load possible with each switching arrangement being in circuit.
If the appliance is provided with a control that limits the total power input, the test is made with
whichever combination of heating units, as may be selected by the control, imposes the most
unfavourable condition.
If the temperature rise limits of motors, transformers or electronic circuits are exceeded, the
test is repeated with the appliance supplied at 1,06 times rated voltage. In this case, only the
temperature rise of the components for which the temperature rise limits were exceeded are
measured.
11.7 Replacement:
Modification:
Replace the first paragraph with the following:
The appliance is operated as follows.
Appliances with steam generators incorporated in the cooking compartment are operated on
continuous cycles until steady conditions are established. Each cycle comprises an operating
period followed by a rest period strictly sufficient, but in no case longer than 5 min, to allow for
replacing the water load, the water level in the steam generators intended to be filled by hand
being, if necessary, restored to the indicated level, in accordance with the manufacturer's
instructions.
© IEC 2025
The operating period is equal to the maximum cooking time declared by the manufacturer or, if
such declaration is not provided, to the time taken for the appliance to reach the maximum
temperature conditions.
Appliances with separate steam generators are switched on and
...

IEC 60335-2-42 ®
Edition 6.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-42: Particular requirements for commercial electric forced convection
ovens, steam cookers and steam-convection ovens

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IEC 60335-2-42 ®
Edition 6.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-42: Particular requirements for commercial electric forced convection
ovens, steam cookers and steam-convection ovens
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.20 ISBN 978-2-8322-4069-4

– 2 – IEC 60335-2-42:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 12
5 General conditions for the tests . 12
6 Classification . 12
7 Marking and instructions . 12
8 Protection against access to live parts . 15
9 Starting of motor-operated appliances . 15
10 Power input and current . 16
11 Heating . 16
12 Void Charging of metal-ion batteries . 18
13 Leakage current and electric strength at operating temperature . 18
14 Transient overvoltages . 19
15 Moisture resistance . 19
16 Leakage current and electric strength . 21
17 Overload protection of transformers and associated circuits . 21
18 Endurance . 21
19 Abnormal operation . 21
20 Stability and mechanical hazards . 23
21 Mechanical strength . 24
22 Construction . 25
23 Internal wiring . 28
24 Components . 29
25 Supply connection and external flexible cords . 29
26 Terminals for external conductors . 30
27 Provision for earthing . 30
28 Screws and connections . 30
29 Clearances, creepage distances and solid insulation . 31
30 Resistance to heat and fire . 31
31 Resistance to rusting . 31
32 Radiation, toxicity and similar hazards . 32
Annexes . 37
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 38
Annex N (normative) Proof tracking test .
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 40
Annex AA (informative) Appliances intended to be used on board ships . 41
Bibliography . 43

Figure 104 101 – Probe for measuring surface temperatures . 32
Figure 102 – Warning sign against danger of scalding .
Figure 105 102 – Adjacent surfaces which are not measured . 33
Figure 103 – Identification of surfaces for temperature measurement . 34
Figure 101 104 – Splash apparatus . 36

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 18
Table 102 – Assembling torques for screwed connections providing earthing continuity . 31

– 4 – IEC 60335-2-42:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
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.
This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60335-2-42:2002+AMD1:2008+AMD2:2017 CSV. A vertical bar appears
in the margin wherever a change has been made. Additions are in green text, deletions are in
strikethrough red text.
IEC 60335-2-42 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This sixth edition cancels and replaces the fifth edition published in 2002, Amendment 1: 2008
and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text, modified or deleted (Clause 1, 7.15,
9.101, 10.1, 11.7, 19.2, 19.7, 20.101, 21.101, 22.101, 22.114, 27.2, 30.101);
c) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
d) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
e) relocation of cleaning instructions from 7.12.1 to 7.12;
f) clarifications to some test specifications have been made (15.1.1, 15.2, 19.2, 19.7, 23.3,
25.3);
g) introduction of a symbol to indicate risk of scalding (7.6);
h) conciliation of the text of IEC 60335-2-42 with other standards under IEC/TC61/MT32.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6366/FDIS 61/6416/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;

– 6 – IEC 60335-2-42:2021 RLV © IEC 2021
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class 01 appliances are allowed (Japan).
– 13.2: Leakage current limits are different (Japan).
– 16.2: Leakage current limits are different (Japan).

IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website:
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and generic standards group safety publications covering
a hazard are not applicable since they have been taken into consideration when developing the general and particular
requirements for the IEC 60335 series of standards. For example, in the case of temperature requirements for
surfaces on many appliances, generic standards, such as ISO 13732-1 for hot surfaces, are not applicable in addition
to Part 1 or part 2 standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods for measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-42:2021 RLV © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electrically operated commercial forced
convection ovens, steam cookers, steam-convection ovens and, exclusive of any other use,
steam generators, not intended for household and similar use, their rated voltage being not
more than 250 V for single-phase appliances connected between one phase and neutral and
480 V for other appliances.
These appliances are not intended for household and similar purposes. They are used for
commercial processing of food in areas not open to the public, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries and
butcheries.
This standard deals also with electrically operated commercial forced convection ovens,
steam cookers, steam-convection ovens intended for use on board ships, for which
informative Annex AA is applicable.
NOTE 101 These appliances are used for commercial processing of food, for example in kitchens of restaurants,
canteens, hospitals and in commercial enterprises such as bakeries, butcheries, etc.
The electrical part of appliances making use of other forms of energy is also within the scope
of this standard.
As far as is practicable, this standard deals with the common hazards presented by these types
of appliances.
NOTE 102 Attention is drawn to the fact that:
– for appliances intended to be used in vehicles or on board ships or aircrafts, additional
requirements may can be necessary;
– in many countries additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour, the national water supply
authorities and similar authorities;
– in many countries additional requirements are specified for pressure appliances.
NOTE 103 This standard does not apply to:
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;
– microwave ovens (IEC 60335-2-90);
– battery-operated appliances.

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-52:2017, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1:
Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread
ISO 3506-1, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 1: Bolts, screws and studs with specified grade and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grade and property classes
ISO 3506-3, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set
screws and similar fasteners not under tensile stress
ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 4:
Tapping screws
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.4 Addition:
Note 101 to entry: The rated power input is the sum of the power inputs of all the individual elements in the
appliance that can be on at one time; where there are several such combinations possible, that giving the highest
power input is used in determining the rated power input.
3.1.9 Replacement:
normal operation
operation of the appliance under the following conditions specified in 3.1.9.101 to 3.1.9.103, as
applicable.
Motors and detachable electrical parts incorporated in the appliance are operated under the
most unfavourable conditions that can be expected in normal use taking into account the
manufacturer's instructions.
3.1.9.101 For dry heat mode, the appliance is operated with all the shelves or the shelf trolley
in position according to the manufacturer's instructions but with no load. The controls are set
so that the mean value of the temperature over the thermostat cycle at the geometric centre
of each usable space in the interior of the oven is maintained at 220 °C ± 4 °C. Stepped controls
are set so that this temperature is 220 °C ± 15 °C.

– 10 – IEC 60335-2-42:2021 RLV © IEC 2021
For ovens that are unable to attain a temperature of 220 °C, the controls are set at the
maximum.
For ovens that are capable of attaining temperatures in excess of 270 °C, the controls are set
so that the mean value of the temperature is 50 °C ± 4 °C below the maximum temperature
attainable.
3.1.9.102 For steaming only mode, the appliance is operated in accordance with the
manufacturer's instructions with all controls intended to be operated by the user adjusted to
their maximum setting until reaching operating temperature. They are then readjusted, if
possible, to the lowest setting that maintains that temperature.
Appliances with steam generators intended to be filled by hand or by a manually operated tap
are filled to the indicated level on the steam generator.
Appliances with steam generators intended to be filled automatically are connected to a water
supply having the maximum pressure designated indicated by the manufacturer. Where the
manufacturer specifies a range of pressures, the pressure is adjusted to give the most
unfavourable conditions.
The incoming water is maintained at:
– 15 °C ± 5 °C in the case of appliances intended for connection to a cold water supply;
– 60 °C ± 5 °C or the temperature indicated in the instruction sheet, whichever is the higher,
in the case of appliances intended for connection to a hot water supply only.
NOTE 101 If the appliance is intended for connection to either a hot or cold water supply, the
temperature of the water is that which gives the most unfavourable results.
Lids, doors, and covers are in position and closed.
The cooking compartment of the appliance contains a water load, initially at 15 °C ± 5 °C,
comprising 0,5 l/kg of the manufacturer's declared maximum food load. The water load is evenly
distributed between the shelves or pans.
NOTE 102 Since pans may be perforated to allow for circulation of steam, the water load may
be contained in suitable containers evenly distributed over the shelves or pans.
3.1.9.103 For combination mode, the appliance is operated as for the steaming only mode,
but with the forced convection fan/s and elements for heating the cooking compartment on
and the temperature controls set as for the dry heat mode.
In all the above cases, motors incorporated in the appliance are operated in the intended
manner under the most severe conditions that can be expected in normal use, taking into
account the manufacturer's instructions.
3.1.101
rated pressure
maximum working pressure of steam cookers and steam generators assigned by the
manufacturer to the pressurized parts of the appliance
3.5 Definitions relating to types of appliances
3.5.101
forced convection oven
appliance intended for the cooking of food by heated air that is circulated by mechanical means
within the cooking compartment

Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
3.5.102
steam cooker
appliance intended for the cooking of food only by means of direct steam contact
Note 1 to entry: The pressure within the cooking compartment can exceed atmospheric pressure.
3.5.103
atmospheric steam cooker
appliance in which the pressure within the cooking compartment does not differ significantly
from atmospheric pressure
3.5.104
steam-convection oven
appliance intended for the cooking of food either by means of direct steam contact or by heated
air circulated by mechanical means within the cooking compartment or by a combination of
these two modes
Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
3.105
rated pressure
the maximum working pressure of steam cookers and steam generators assigned by the
manufacturer to the pressurized parts of the appliance
3.6 Definitions relating to parts of an appliance
3.1066.101
steam generator
that part of the appliance designed specifically for the generation of steam for exclusive use in
a cooking compartment
Note 1 to entry: The steam generator may be either combined within the cooking compartment, remote from the
cooking compartment, but contained within the same casing, or function as a separate unit providing steam for one
or more cooking compartments.
3.1076.102
cooking compartment
that part of the appliance in which the cooking or food heating process takes place
3.1106.103
functional surface
surface that is intentionally heated by an internal heat source and has to be hot to carry out the
function for which the appliance is intended
Note 1 to entry: An example is the heated sheath of a tubular heating element.
3.1116.104
adjacent surface
surface that is adjacent to a functional surface and which can become hot through conduction
3.8 Definitions relating to miscellaneous matters
3.1088.101
indicated level
mark on the appliance or steam generator to indicate the maximum liquid level for correct
operation
– 12 – IEC 60335-2-42:2021 RLV © IEC 2021
3.1098.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.10 Addition:
Appliances intended for installation in a bank of other appliances and appliances intended to
be fixed to an installation wall are enclosed to obtain protection against electric shock and
harmful ingress of water equivalent to that obtained when installed in accordance with the
instructions provided with the appliance.
NOTE 101 Appropriate enclosures or additional appliances may can be needed for test purposes.
5.101 Appliances are tested as heating appliances, even if they incorporate a motor.
Appliances are tested as heating appliances, when during a mode of operation electrical
heaters are energized. If no electrical heaters are energized, the appliances are tested as
motor-operated appliances.
5.102 Appliances, when assembled in combination with or incorporating other appliances, are
tested in accordance with the requirements of this standard. The other appliances are operated
simultaneously in accordance with the requirements of the relevant standards.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
Unless the instructions include the statement to install the appliance and shelf trolley less than
1,6 m above the floor, the appliance and shelf trolley shall be marked with the risk of scalding
symbol on the front surface.
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 and for which the provisions of footnote b to Table 101 apply, then the appliance
shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041 (2002-10)] caution, hot surface

risk of scalding
NOTE 101 The “Risk of scalding” symbol incorporates symbol IEC 60417-6418 (2020-06) combined with the
warning sign of ISO 3864-1.
7.12 Addition:
The instructions of steam cookers and steam-convection ovens shall also include information
with regard to the maximum food load in kilograms (kg).
The instructions of steam cookers shall include the substance of the following warning:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
Instructions for user maintenance, for example cleaning, shall also be given. They shall include
a statement that the appliance is not to be cleaned with a water jet or a steam cleaner.
If any of symbols IEC 60417-5021 (2002-10) and or IEC 60417-5041 (2002-10) or the risk of
scalding symbol are marked on the appliance, their its meaning shall be explained.
The appliance and trolley shall be clearly visible and permanently marked with the warning sign
shown in Figure 102 at a height of 1,60 m above the floor, if required.
NOTE The warning sign at the trolley can be etched or stamped and the size can be reduced.
If the appliance is not marked, the required warning sign shall be a part of delivery and the
instructions shall point out that this marking has to be mounted after installation at a height of
1,60 m above the floor.
If the risk of scalding symbol is required to be marked in 7.1, but the appliance is not marked,
the label with the symbol shall be supplied with the appliance and the instructions shall state
that the label shall be affixed on the front surface after the installation at a height of 1,6 m or
higher above the floor.
The instructions shall include the substance of the following warning:
WARNING: To avoid scalding, do not use loaded containers with liquids or cooking goods
which becomes fluid by heating in higher levels than those which can be easily

– 14 – IEC 60335-2-42:2021 RLV © IEC 2021
observed that become fluid by heating in shelves positioned at levels higher
than 1,6 m above the floor.
The instructions of steam cookers and steam-convection ovens shall include the substance
of the following warning:
WARNING: When opening the door of the cooking compartment, hot steam can come out.
The instructions shall include the substance of the following:
These appliances are intended to be used for commercial applications, for example in
kitchens of restaurants, canteens, hospitals and in commercial enterprises such as
bakeries, butcheries, etc., but not for continuous mass production of food.
If the manufacturer wants to limit the use of the appliance to less than the above, this has to
shall be clearly stated in the instructions.
If the shelves support have a “L-shape”, the instructions shall inform the user on the fact that
these shelves are not suitable for the use with containers with liquids or for cooking processes
which can generate liquids.
Modification:
The instruction concerning persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge and children playing with the appliance
is not applicable.
7.12.1 Replacement Addition:
The appliance shall be accompanied by instructions detailing any special precautions
necessary for installation. For appliances intended for installation in a bank of other appliances
and appliances intended to be fixed to an installation wall, details of how to ensure appropriate
protection against electric shock and harmful ingress of water shall be supplied. If the controls
of more than one appliance are combined in a separate enclosure, detailed installation
instructions shall be supplied. Instructions for user maintenance, for example cleaning, shall
also be given. They shall include a statement that the appliance is not to be cleaned with a
water jet or a steam cleaner.
For appliances that are permanently connected to fixed wiring and for which leakage currents
may can exceed 10 mA, particularly if disconnected or not used for long periods, or during initial
installation, the instructions shall give recommendations regarding the rating of protective
devices, such as earth leakage relays residual current devices (RCD), to be installed.
Compliance is checked by inspection.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle used with in symbol IEC 60417-5041 (2002-10) shall be at least
15 mm.
The height of risk of scalding symbol shall be at least 30 mm.
NOTE 101 The risk of scalding symbol at the trolley can be etched or stamped; in this case the size can be reduced.
7.15 Addition:
The marking specified for external accessible surfaces shall be visible when the appliance is
operated as in normal use, including when actuating any switch, adjusting any control or
opening a lid or door. It shall not be placed on a functional surface or adjacent surface.
Modification:
For fixed appliances, the marking of the name or trademark or identification mark of the
manufacturer or responsible vendor and the model or type reference shall be marked on the
appliance and, if not visible when the appliance is installed as in normal use, shall be included
in the instructions or on an additional label that can be fixed near the appliance after installation.
NOTE 101 An example of such a fixed appliance is a built-in appliance.
7.101 Appliances and steam generators intended to be filled by hand or by a manually
operated tap shall be marked with an indicated level.
Compliance is checked by inspection.
7.102 Equipotential bonding terminals shall be marked with symbol 5021 of IEC 60417-1
IEC 60417-5021 (2002-10).
These markings shall not be placed on screws, removable washers or other parts that can be
removed when conductors are being connected.
Compliance is checked by inspection.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is applicable except as follows.
9.101 Fan motors providing a cooling effect in order to comply with the requirements of Clause
11 shall start under all voltage conditions that may can occur in use. The requirement is not
applicable to the fan motor of a convection fan.
Compliance is checked by starting the motor three times at a voltage equal to 0,85 times rated
voltage, the motor being at room temperature at the beginning of the test.
The motor is started each time under the conditions occurring at the beginning of normal
operation or, for automatic appliances, at the beginning of the normal cycle of operation, the
motor being allowed to come to rest between successive starts.
Compliance is checked by the following tests using a supply source such that its drop in voltage
does not exceed 1 % during the tests. The appliance being returned to room temperature after
each test.
– 16 – IEC 60335-2-42:2021 RLV © IEC 2021
The appliance is started under the conditions occurring at the beginning of normal operation
or, for automatic appliances, at the beginning of the normal cycle of operation, a voltage equal
to 0,85 times rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protection protective devices of the motor shall not operate.
NOTE 1 The supply source must be such that during the test the drop in voltage does not exceed 1 %.
NOTE 2 A fan motor for the convection fan only is not considered to provide a cooling effect.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
NOTE 101 For appliances having more than one heating unit, the total power input may be
determined by measuring the power input of each heating unit separately (see also 3.1.4).
11 Heating
This clause of Part 1 is applicable except as follows.
11.2 Addition:
Appliances intended to be fixed to the floor and appliances with a mass greater than 40 kg and
not provided with rollers, castors or similar means are installed in accordance with the
manufacturer's instructions. If no instructions are given, these appliances are considered as
appliances normally placed on the floor.
Separate cooking compartments and steam generators are assembled in accordance with
the manufacturer's instructions and located in the test corner in such a manner that they will
have the most unfavourable effect on each other and on their surroundings.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 104 Figure 101 is used to measure the temperature rises of external accessible
surfaces specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface
in such a way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact pe
...

IEC 60335-2-42 ®
Edition 6.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-42: Particular requirements for commercial electric forced convection
ovens, steam cookers and steam-convection ovens

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-42: Exigences particulières pour les fours à convection forcée, les
cuiseurs à vapeur et les fours combinés vapeur-convection électriques à usage
commercial
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IEC 60335-2-42 ®
Edition 6.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –

Part 2-42: Particular requirements for commercial electric forced convection

ovens, steam cookers and steam-convection ovens

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-42: Exigences particulières pour les fours à convection forcée, les

cuiseurs à vapeur et les fours combinés vapeur-convection électriques à usage

commercial
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20 ISBN 978-2-8322-1042-1

– 2 – IEC 60335-2-42:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 11
5 General conditions for the tests . 11
6 Classification . 12
7 Marking and instructions . 12
8 Protection against access to live parts . 15
9 Starting of motor-operated appliances . 15
10 Power input and current . 15
11 Heating . 15
12 Charging of metal-ion batteries . 17
13 Leakage current and electric strength at operating temperature . 17
14 Transient overvoltages . 18
15 Moisture resistance . 18
16 Leakage current and electric strength . 19
17 Overload protection of transformers and associated circuits . 20
18 Endurance . 20
19 Abnormal operation . 20
20 Stability and mechanical hazards . 21
21 Mechanical strength . 22
22 Construction . 23
23 Internal wiring . 26
24 Components . 26
25 Supply connection and external flexible cords . 26
26 Terminals for external conductors . 27
27 Provision for earthing . 27
28 Screws and connections . 27
29 Clearances, creepage distances and solid insulation . 28
30 Resistance to heat and fire . 28
31 Resistance to rusting . 29
32 Radiation, toxicity and similar hazards . 29
Annexes . 33
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 34
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 35
Annex AA (informative) Appliances intended to be used on board ships . 36
Bibliography . 38

Figure 101 – Probe for measuring surface temperatures . 29
Figure 102 – Adjacent surfaces which are not measured. 30
Figure 103 – Identification of surfaces for temperature measurement . 31
Figure 104 – Splash apparatus . 32

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 17
Table 102 – Assembling torques for screwed connections providing earthing continuity . 28

– 4 – IEC 60335-2-42:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

FOREWORD
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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.
IEC 60335-2-42 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This sixth edition cancels and replaces the fifth edition published in 2002, Amendment 1: 2008
and Amendment 2:2017. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text, modified or deleted (Clause 1, 7.15,
9.101, 10.1, 11.7, 19.2, 19.7, 20.101, 21.101, 22.101, 22.114, 27.2, 30.101);
c) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
d) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);

e) relocation of cleaning instructions from 7.12.1 to 7.12;
f) clarifications to some test specifications have been made (15.1.1, 15.2, 19.2, 19.7, 23.3,
25.3);
g) introduction of a symbol to indicate risk of scalding (7.6);
h) conciliation of the text of IEC 60335-2-42 with other standards under IEC/TC61/MT32.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6366/FDIS 61/6416/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications.
A list of all parts in the IEC 60335 series, published under the general title Household and
similar electrical appliances – Safety, can be found on the IEC website.
This Part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its
amendments unless that edition precludes it; in that case, the latest edition that does not
preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this standard, it refers to IEC 60335-1.
This Part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to convert
that publication into the IEC standard: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the adjective and the
associated noun are also in bold.

– 6 – IEC 60335-2-42:2021 © IEC 2021
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months or later than 36 months from the date of publication.
The following differences exist in the countries indicated below.
– 6.1: Class 01 appliances are allowed (Japan).
– 13.2: Leakage current limits are different (Japan).
– 16.2: Leakage current limits are different (Japan).

IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
It has been assumed in the drafting of this International Standard that the execution of its
provisions is entrusted to appropriately qualified and experienced persons.
Guidance documents concerning the application of the safety requirements for appliances can
be accessed via TC 61 supporting documents on the IEC website:
https://www.iec.ch/tc61/supportingdocuments
This information is given for the convenience of users of this International Standard and does
not constitute a replacement for the normative text in this standard.
This standard recognizes the internationally accepted level of protection against hazards such
as electrical, mechanical, thermal, fire and radiation of appliances when operated as in normal
use taking into account the manufacturer's instructions. It also covers abnormal situations that
can be expected in practice and takes into account the way in which electromagnetic
phenomena can affect the safe operation of appliances.
This standard takes into account the requirements of IEC 60364 as far as possible so that there
is compatibility with the wiring rules when the appliance is connected to the supply mains.
However, national wiring rules may differ.
If an appliance within the scope of this standard also incorporates functions that are covered
by another Part 2 of IEC 60335, the relevant Part 2 is applied to each function separately, as
far as is reasonable. If applicable, the influence of one function on the other is taken into
account.
When a Part 2 standard does not include additional requirements to cover hazards dealt with
in Part 1, Part 1 applies.
NOTE 1 This means that the technical committees responsible for the Part 2 standards have determined that it is
not necessary to specify particular requirements for the appliance in question over and above the general
requirements.
This standard is a product family standard dealing with the safety of appliances and takes
precedence over horizontal and generic standards covering the same subject.
NOTE 2 Horizontal publications, basic safety publications and group safety publications covering a hazard are not
applicable since they have been taken into consideration when developing the general and particular requirements
for the IEC 60335 series of standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods for measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-42:2021 © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-42: Particular requirements for commercial electric forced
convection ovens, steam cookers and steam-convection ovens

1 Scope
This clause of Part 1 is replaced by the following.
This part of IEC 60335 deals with the safety of electrically operated commercial forced
convection ovens, steam cookers, steam-convection ovens and, exclusive of any other use,
steam generators, their rated voltage being not more than 250 V for single-phase appliances
connected between one phase and neutral and 480 V for other appliances.
These appliances are not intended for household and similar purposes. They are used for
commercial processing of food in areas not open to the public, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries and
butcheries.
This standard deals also with electrically operated commercial forced convection ovens,
steam cookers, steam-convection ovens intended for use on board ships, for which
informative Annex AA is applicable.
The electrical part of appliances making use of other forms of energy is also within the scope
of this standard.
As far as is practicable, this standard deals with the common hazards presented by these types
of appliances.
Attention is drawn to the fact that:
– for appliances intended to be used in vehicles or on board ships or aircrafts, additional
requirements can be necessary;
– in many countries additional requirements are specified by the national health authorities,
the national authorities responsible for the protection of labour, the national water supply
authorities and similar authorities;
– in many countries additional requirements are specified for pressure appliances.
This standard does not apply to:
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;
– microwave ovens (IEC 60335-2-90);
– battery-operated appliances.

2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60068-2-6, Environmental testing – Part 2-6: Tests – Test Fc: Vibration (sinusoidal)
IEC 60068-2-27, Environmental testing – Part 2-27: Tests – Test Ea and guidance: Shock
IEC 60068-2-52:2017, Environmental testing – Part 2: Tests – Test Kb: Salt mist, cyclic (sodium
chloride solution)
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances
ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1:
Bolts, screws and studs with specified property classes – Coarse thread and fine pitch thread
ISO 3506-1, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 1: Bolts, screws and studs with specified grade and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grade and property classes
ISO 3506-3, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 3: Set
screws and similar fasteners not under tensile stress
ISO 3506-4, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 4:
Tapping screws
3 Terms and definitions
This clause of Part 1 is applicable except as follows.
3.1 Definitions relating to physical characteristics
3.1.4 Addition:
Note 101 to entry: The rated power input is the sum of the power inputs of all the individual elements in the
appliance that can be on at one time; where there are several such combinations possible, that giving the highest
power input is used in determining the rated power input.
3.1.9 Replacement:
operation of the appliance under the conditions specified in 3.1.9.101 to 3.1.9.103, as
applicable.
Motors and detachable electrical parts incorporated in the appliance are operated under the
most unfavourable conditions that can be expected in normal use taking into account the
manufacturer's instructions.
3.1.9.101 For dry heat mode, the appliance is operated with all the shelves or the shelf trolley
in position according to the manufacturer's instructions but with no load. The controls are set
so that the mean value of the temperature over the thermostat cycle at the geometric centre
of each usable space in the interior of the oven is maintained at 220 °C ± 4 °C. Stepped controls
are set so that this temperature is 220 °C ± 15 °C.
For ovens that are unable to attain a temperature of 220 °C, the controls are set at the
maximum.
– 10 – IEC 60335-2-42:2021 © IEC 2021
For ovens that are capable of attaining temperatures in excess of 270 °C, the controls are set
so that the mean value of the temperature is 50 °C ± 4 °C below the maximum temperature
attainable.
3.1.9.102 For steaming only mode, the appliance is operated in accordance with the
manufacturer's instructions with all controls intended to be operated by the user adjusted to
their maximum setting until reaching operating temperature. They are then readjusted, if
possible, to the lowest setting that maintains that temperature.
Appliances with steam generators intended to be filled by hand or by a manually operated tap
are filled to the indicated level on the steam generator.
Appliances with steam generators intended to be filled automatically are connected to a water
supply having the maximum pressure indicated by the manufacturer. Where the manufacturer
specifies a range of pressures, the pressure is adjusted to give the most unfavourable
conditions.
The incoming water is maintained at:
– 15 °C ± 5 °C in the case of appliances intended for connection to a cold water supply;
– 60 °C ± 5 °C or the temperature indicated in the instruction sheet, whichever is the higher,
in the case of appliances intended for connection to a hot water supply only.
If the appliance is intended for connection to either a hot or cold water supply, the temperature
of the water is that which gives the most unfavourable results.
Lids, doors, and covers are in position and closed.
The cooking compartment of the appliance contains a water load, initially at 15 °C ± 5 °C,
comprising 0,5 l/kg of the manufacturer's declared maximum food load. The water load is evenly
distributed between the shelves or pans. Since pans may be perforated to allow for circulation
of steam, the water load may be contained in suitable containers evenly distributed over the
shelves or pans.
3.1.9.103 For combination mode, the appliance is operated as for the steaming only mode,
but with the forced convection fan/s and elements for heating the cooking compartment on
and the temperature controls set as for the dry heat mode.
3.1.101
rated pressure
maximum working pressure of steam cookers and steam generators assigned by the
manufacturer to the pressurized parts of the appliance
3.5 Definitions relating to types of appliances
3.5.101
forced convection oven
appliance intended for the cooking of food by heated air that is circulated by mechanical means
within the cooking compartment
Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
3.5.102
steam cooker
appliance intended for the cooking of food only by means of direct steam contact
Note 1 to entry: The pressure within the cooking compartment can exceed atmospheric pressure.

3.5.103
atmospheric steam cooker
appliance in which the pressure within the cooking compartment does not differ significantly
from atmospheric pressure
3.5.104
steam-convection oven
appliance intended for the cooking of food either by means of direct steam contact or by heated
air circulated by mechanical means within the cooking compartment or by a combination of
these two modes
Note 1 to entry: The pressure within the cooking compartment does not differ significantly from atmospheric
pressure.
3.6 Definitions relating to parts of an appliance
3.6.101
steam generator
that part of the appliance designed specifically for the generation of steam for exclusive use in
a cooking compartment
Note 1 to entry: The steam generator may be either combined within the cooking compartment, remote from the
cooking compartment, but contained within the same casing, or function as a separate unit providing steam for one
or more cooking compartments.
3.6.102
cooking compartment
that part of the appliance in which the cooking or food heating process takes place
3.6.103
functional surface
surface that is intentionally heated by an internal heat source and has to be hot to carry out the
function for which the appliance is intended
Note 1 to entry: An example is the heated sheath of a tubular heating element.
3.6.104
adjacent surface
surface that is adjacent to a functional surface and which can become hot through conduction
3.8 Definitions relating to miscellaneous matters
3.8.101
indicated level
mark on the appliance or steam generator to indicate the maximum liquid level for correct
operation
3.8.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.

– 12 – IEC 60335-2-42:2021 © IEC 2021
5.10 Addition:
Appliances intended for installation in a bank of other appliances and appliances intended to
be fixed to an installation wall are enclosed to obtain protection against electric shock and
harmful ingress of water equivalent to that obtained when installed in accordance with the
instructions provided with the appliance.
NOTE Appropriate enclosures or additional appliances can be needed for test purposes.
5.101 Appliances are tested as heating appliances, when during a mode of operation
electrical heaters are energized. If no electrical heaters are energized, the appliances are tested
as motor-operated appliances.
5.102 Appliances, when assembled in combination with or incorporating other appliances, are
tested in accordance with the requirements of this standard. The other appliances are operated
simultaneously in accordance with the requirements of the relevant standards.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
Unless the instructions include the statement to install the appliance and shelf trolley less than
1,6 m above the floor, the appliance and shelf trolley shall be marked with the risk of scalding
symbol on the front surface.
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 and for which the provisions of footnote b to Table 101 apply, then the appliance
shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041 (2002-10)] caution, hot surface

risk of scalding
NOTE 101 The “Risk of scalding” symbol incorporates symbol IEC 60417-6418 (2020-06) combined with the
warning sign of ISO 3864-1.
7.12 Addition:
The instructions of steam cookers and steam-convection ovens shall also include information
with regard to the maximum food load in kilograms (kg).
The instructions of steam cookers shall include the substance of the following warning:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
Instructions for user maintenance, for example cleaning, shall also be given. They shall include
a statement that the appliance is not to be cleaned with a water jet or a steam cleaner.
If any of symbols IEC 60417-5021 (2002-10) or IEC 60417-5041 (2002-10) or the risk of
scalding symbol are marked on the appliance, its meaning shall be explained.
If the risk of scalding symbol is required to be marked in 7.1, but the appliance is not marked,
the label with the symbol shall be supplied with the appliance and the instructions shall state
that the label shall be affixed on the front surface after the installation at a height of 1,6 m or
higher above the floor.
The instructions shall include the substance of the following warning:
WARNING: To avoid scalding, do not use loaded containers with liquids or cooking goods
that become fluid by heating in shelves positioned at levels higher than 1,6 m
above the floor.
The instructions of steam cookers and steam-convection ovens shall include the substance
of the following warning:
WARNING: When opening the door of the cooking compartment, hot steam can come out.
The instructions shall include the substance of the following:
These appliances are intended to be used for commercial applications, for example in
kitchens of restaurants, canteens, hospitals and in commercial enterprises such as
bakeries, butcheries, etc., but not for continuous mass production of food.
If the manufacturer wants to limit the use of the appliance to less than the above, this shall be
clearly stated in the instructions.
If the shelves support have a “L-shape”, the instructions shall inform the user on the fact that
these shelves are not suitable for the use with containers with liquids or for cooking processes
which can generate liquids.
– 14 – IEC 60335-2-42:2021 © IEC 2021
Modification:
The instruction concerning persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge and children playing with the appliance
is not applicable.
7.12.1 Addition:
The appliance shall be accompanied by instructions detailing any special precautions
necessary for installation. For appliances intended for installation in a bank of other appliances
and appliances intended to be fixed to an installation wall, details of how to ensure appropriate
protection against electric shock and harmful ingress of water shall be supplied. If the controls
of more than one appliance are combined in a separate enclosure, detailed installation
instructions shall be supplied.
For appliances that are permanently connected to fixed wiring and for which leakage currents
can exceed 10 mA, particularly if disconnected or not used for long periods, or during initial
installation, the instructions shall give recommendations regarding the rating of protective
devices, such as residual current devices (RCD), to be installed.
Compliance is checked by inspection.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle in symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
The height of risk of scalding symbol shall be at least 30 mm.
NOTE 101 The risk of scalding symbol at the trolley can be etched or stamped; in this case the size can be reduced.
7.15 Addition:
The marking specified for external accessible surfaces shall be visible when the appliance is
operated as in normal use, including when actuating any switch, adjusting any control or
opening a lid or door. It shall not be placed on a functional surface or adjacent surface.
Modification:
For fixed appliances, the marking of the name or trademark or identification mark of the
manufacturer or responsible vendor and the model or type reference shall be marked on the
appliance and, if not visible when the appliance is installed as in normal use, shall be included
in the instructions or on an additional label that can be fixed near the appliance after installation.
7.101 Appliances and steam generators intended to be filled by hand or by a manually
operated tap shall be marked with an indicated level.
Compliance is checked by inspection.

7.102 Equipotential bonding terminals shall be marked with symbol IEC 60417-5021
(2002-10).
These markings shall not be placed on screws, removable washers or other parts that can be
removed when conductors are being connected.
Compliance is checked by inspection.
8 Protection against access to live parts
This clause of Part 1 is applicable.
9 Starting of motor-operated appliances
This clause of Part 1 is applicable except as follows.
9.101 Fan motors providing a cooling effect in order to comply with the requirements of Clause
11 shall start under all voltage conditions that can occur in use. The requirement is not
applicable to the fan motor of a convection fan.
Compliance is checked by the following tests using a supply source such that its drop in voltage
does not exceed 1 % during the tests. The appliance being returned to room temperature after
each test.
The appliance is started under the conditions occurring at the beginning of normal operation
or, for automatic appliances, at the beginning of the normal cycle of operation, a voltage equal
to 0,85 times rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protective devices of the motor shall not operate.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
For appliances having more than one heating unit, the total power input may be determined by
measuring the power input of each heating unit separately (see also 3.1.4).
11 Heating
This clause of Part 1 is applicable except as follows.

– 16 – IEC 60335-2-42:2021 © IEC 2021
11.2 Addition:
Appliances intended to be fixed to the floor and appliances with a mass greater than 40 kg and
not provided with rollers, castors or similar means are installed in accordance with the
manufacturer's instructions. If no instructions are given, these appliances are considered as
appliances normally placed on the floor.
Separate cooking compartments and steam generators are assembled in accordance with
the manufacturer's instructions and located in the test corner in such a manner that they will
have the most unfavourable effect on each other and on their surroundings.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 101 is used to measure the temperature rises of external accessible surfaces
specified in Table 101. The probe is applied with a force of 4 N ± 1 N to the surface in such a
way that the best possible contact between the probe and the surface is ensured. The
measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any measuri
...