IEC 60335-2-90:2024

Household and similar electrical appliances - Safety - Part 2-90: Particular requirements for commercial microwave ovens

IEC 60335-2-90:2024 is available as IEC 60335-2-90:2024 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 60335-2-90:2024 deals with:
- the safety of microwave ovens with a cavity door intended for commercial 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, also in areas open to the public, for example in kitchens of restaurants, canteens, hospitals and in commercial enterprises such as bakeries and butcheries;
- the safety of combination microwave ovens with a cavity door, the requirements of which are contained in normative Annex AA;
- the safety of microwave ovens without a cavity door and with transportation means that are intended for commercial use only, for the heating of food and beverages, the requirements of which are contained in normative Annex BB.
Microwave ovens covered by normative Annex BB have transportation means for moving the load through the microwave oven. Requirements for tunnel microwave ovens and several types of microwave vending machines are covered.
This standard also deals with microwave ovens intended to be used on board ships, for which normative Annex EE is applicable.
In normative Annex BB, a microwave oven without a cavity door and with transportation means is described as a microwave oven. All clauses of this standard apply to these appliances unless otherwise specified in normative Annex BB.
This part of IEC 60335 also takes into account ordinary persons having access to the removing area of the vending machine.
The appliance can be built into a vending machine, in which case IEC 60335-2-75 can also be applicable.
Appliances that use non-electrical energy are within the scope of this standard.
As far as is practicable, this standard deals with the common hazards presented by these types of appliances.
This standard does not take into account the use of a microwave oven without a cavity door and with transportation means by ordinary persons except in the vicinity of entrance and exit ports.
The rationales for particular microwave exposure conditions and measures related to microwave energy being confined by an open structure are given in normative Annex BB.
Attention is drawn to the fact that
- for appliances intended to be used in vehicles or on trains, on board ships or board aircraft, additional requirements can be necessary;
- for appliances intended to be used in tropical countries, special requirements can be necessary;
- in many countries, the national health authorities, the national authorities responsible for the protection of labour and similar authorities specify additional requirements;
- in many countries, national authorities specify additional requirements to BB.22.101.1.
This standard does not apply to
- Microwave ovens including combination microwave ovens for household use covered by IEC 60335-2-25 and used in the following environments by laymen:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• by clients in hotels, motels and other residential type environments;
• bed and breakfast type environments.
- industrial microwave heating equipment (IEC 60519-6);
- appliances for medical purposes (IEC 60601);
- 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).
This fifth edition cancels and replaces the fourth edition published in 2015 including its Amendment 1:2019. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) the appliance used in area open to the public has been introduced i

Appareils électrodomestiques et analogues - Sécurité - Partie 2-90: Exigences particulières pour les fours à micro-ondes à usage commercial

IEC 60335-2-90:2024 est disponible sous forme de IEC 60335-2-90:2024 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 60335-2-90:2024 traite:
- de la sécurité des fours à micro-ondes à usage commercial avec porte de cavité 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 utilisés pour la transformation commerciale des denrées alimentaires, également dans les zones ouvertes au public, par exemple dans les cuisines de restaurants, de cantines, d'hôpitaux et dans les entreprises commerciales telles que les boulangeries et les boucheries;
- de la sécurité des fours à micro-ondes combinés avec porte de cavité, dont les exigences sont fournies à l'Annexe AA normative;
- de la sécurité des fours à micro-ondes sans porte de cavité et avec moyen de transport qui sont destinés à un usage commercial uniquement, pour le chauffage des aliments et des boissons, dont les exigences sont contenues à l'Annexe BB normative.
Les fours à micro-ondes couverts par l'Annexe BB normative disposent d'un moyen de transport pour déplacer la charge à travers le four à micro-ondes. Les exigences pour les tunnels à micro-ondes et plusieurs types de distributeurs à micro-ondes sont couvertes.
La présente norme traite également des fours à micro-ondes destinés à être utilisés à bord de navires, pour lesquels l'Annexe EE normative s'applique.
L'Annexe BB normative décrit un four à micro-ondes sans porte de cavité et avec moyen de transport comme un four à micro-ondes. Sauf indication contraire dans l'Annexe BB normative, tous les articles de la présente norme s'appliquent à ces appareils.
La présente partie de l'IEC 60335 prend également en compte les personnes ordinaires qui accèdent à la zone de retrait du distributeur automatique.
L'appareil peut être intégré à un distributeur automatique, auquel cas l'IEC 60335-2-75 peut aussi s'appliquer.
Les appareils qui utilisent une énergie non électrique relèvent du 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.
La présente norme ne prend pas en compte l'utilisation d'un four à micro-ondes sans porte de cavité et avec moyens de transport par des personnes ordinaires, sauf à proximité des orifices d'entrée et de sortie.
L'Annexe BB normative fournit les justifications pour des conditions particulières d'exposition aux micro-ondes, ainsi que des mesures liées à l'énergie micro-ondes confinée par une structure ouverte.
L'attention est attirée sur le fait que
- pour les appareils destinés à être utilisés dans des véhicules ou des trains, à bord de navires ou à bord d'avions, des exigences supplémentaires peuvent être nécessaires;
- pour les appareils destinés à être utilisés dans des pays tropicaux, des exigences particulières 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 et par des organismes similaires;
- dans de nombreux pays, les organismes nationaux spécifient des exigences supplémentaires au BB.22.101.1.
La présente norme ne s'applique pas
- aux fours à micro-ondes, y compris les fours à micro-ondes combinés destinés à un usage domestique couverts par l'IEC 60335-2-25 et utilisés par des usagers non avertis dans les environnements suivants:
• les coins cuisines réservés au personnel des magasins, bureaux et autres environnements professionnels;
• les fermes;
• par les clients dans les hôtels, les motels et autres environnements résidentiels;
• les environnements de type chambres d'hôtes;
- aux installat

General Information

• Status: Published
• Publication Date: 10-Jul-2024
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: SC 61B - Safety of stationary cooking appliances for household use, and microwave appliances for household and commercial use
• Drafting Committee: MT 1 - TC 61/SC 61B/MT 1
• Current Stage: PPUB - Publication issued
• Start Date: 19-Jul-2024
• Completion Date: 11-Jul-2024

Relations

• Revises: IEC 60335-2-90:2015/AMD1:2019 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-90: Particular requirements for commercial microwave ovens
• Effective Date: 05-Sep-2023
• Revises: IEC 60335-2-90:2015 - Household and similar electrical appliances - Safety - Part 2-90: Particular requirements for commercial microwave ovens
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60335-2-90 ®
Edition 5.0 2024-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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About the IEC
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IEC 60335-2-90 ®
Edition 5.0 2024-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.20 ISBN 978-2-8322-9406-2

– 2 – IEC 60335-2-90:2024 RLV © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
4 General requirement . 14
5 General conditions for the tests . 14
6 Classification . 14
7 Marking and instructions . 15
8 Protection against access to live parts . 17
9 Starting of motor-operated appliances . 17
10 Power input and current . 17
11 Heating . 17
12 Void Charging of metal-ion batteries . 20
13 Leakage current and electric strength at operating temperature . 20
14 Transient overvoltages . 20
15 Moisture resistance . 21
16 Leakage current and electric strength . 21
17 Overload protection of transformers and associated circuits . 22
18 Endurance . 22
19 Abnormal operation . 23
20 Stability and mechanical hazards . 25
21 Mechanical strength . 26
22 Construction . 28
23 Internal wiring . 33
24 Components . 33
25 Supply connection and external flexible cords . 34
26 Terminals for external conductors . 34
27 Provision for earthing . 34
28 Screws and connections . 35
29 Clearances, creepage distances and solid insulation . 35
30 Resistance to heat and fire . 35
31 Resistance to rusting . 35
32 Radiation, toxicity and similar hazards . 35
Annexes . 38
Annex A (informative) Routine tests . 39
Annex R (normative) Software evaluation . 41
Annex AA (normative) Combination microwave ovens . 42
Annex BB (normative) Requirements for commercial microwave ovens without a cavity
door and with conveyor-type means . 44
Annex CC (informative) Overview of the requirements for covers, means of access
and similar . 58

Annex DD (informative) Rationales for the microwave barrier and associated leakage
tests . 60
Annex EE (normative) Microwave ovens intended to be used on board ships . 66
Bibliography . 70

Figure 101 – Test rod for door interlock concealment . 36
Figure 102 – Probe for measuring surface temperatures . 36
Figure 103 – Front view of appliance with identification of excluded areas . 37
Figure BB.1.201 – Splash apparatus . 55
Figure BB.2.202 – Arrangement for measurement of microwave leakage from access
openings . 56
Figure BB.3.203 – Examples of definitions of Clause 3 and Clause BB.3 . 57

Table 101 – Maximum temperature rises of external accessible surfaces under normal
operating conditions . 19
Table 102 – Maximum temperature rises of external accessible surfaces for appliances
intended to be used in areas open to the public under normal operating conditions . 20
Table 101 103 – Number of potatoes . 24
Table BB.101.201 – Specifications for microwave barriers . 51
Table BB.202 – Assembling torques for screwed connections providing earthing
continuity . 53
Table CC.1 – Overview of the requirements for covers, means of access and similar . 59
Table EE.201 – Assembling torques for screwed connections providing earthing
continuity . 69

– 4 – IEC 60335-2-90:2024 RLV © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-90: Particular requirements for commercial microwave 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
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the latest information, which may be obtained from the patent databa
...

IEC 60335-2-90 ®
Edition 5.0 2024-07
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-90:2024 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
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IEC Secretariat Tel.: [phone]
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About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
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IEC 60335-2-90 ®
Edition 5.0 2024-07
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-90:2024 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.20 ISBN 978-2-8322-9407-9

IEC 60335-1:2020/ISH1:2021 – 1 –
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0  2020-09
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –

Part 1: General requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 61: Safety of
household and similar electrical appliances.
The text of this Interpretation Sheet is based on the following documents:
Draft Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
___________
INTRODUCTION
Edition 6 of IEC 60335-1:2020 defines and introduces requirements for a detachable
power supply part of an appliance. In the document, 24.2 prohibits the use of a power
supply in a flexible cord.
QUESTION:
Does Subclause 24.2 prohibit the use of a detachable power supply part?
ANSWER
No, a "detachable power supply part" is a defined term and is not captured by the term
"power supply" as used in Subclause 24.2.
NOTE A detachable power supply part is captured by the defined term when the output of the power supply
part is detachable from the class III construction part of the appliance at:
– the power supply part, or
– the class III construction part of the appliance.
However, the supply cord (if any) does not have to be detachable from the detachable power supply part.
ICS 13.120; 97.030
IEC 60335-1:2020-09/ISH1:2021-11(en)

– 2 – IEC 60335-2-90:2024 EXV © IEC 2024
CONTENTS
FOREWORD . 6
INTRODUCTION to IEC 60335-1:2020 . 9
INTRODUCTION to IEC 60335-2-90:2024 . 11
1 Scope . 12
2 Normative references . 13
3 Terms and definitions . 19
4 General requirement . 33
5 General conditions for the tests . 33
6 Classification . 38
7 Marking and instructions . 38
8 Protection against access to live parts . 48
9 Starting of motor-operated appliances . 50
10 Power input and current . 51
11 Heating . 53
12 Charging of metal-ion batteries . 60
13 Leakage current and electric strength at operating temperature . 62
14 Transient overvoltages . 64
15 Moisture resistance . 65
16 Leakage current and electric strength . 68
17 Overload protection of transformers and associated circuits . 71
18 Endurance . 71
19 Abnormal operation . 72
20 Stability and mechanical hazards . 84
21 Mechanical strength . 86
22 Construction . 89
23 Internal wiring . 107
24 Components . 109
25 Supply connection and external flexible cords . 114
26 Terminals for external conductors . 122
27 Provision for earthing . 125
28 Screws and connections . 127
29 Clearances, creepage distances and solid insulation . 129
30 Resistance to heat and fire . 137
31 Resistance to rusting . 142
32 Radiation, toxicity and similar hazards . 142
Annex A (informative) Routine tests . 158
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 162
Annex C (normative) Ageing test on motors . 183
Annex D (normative) Thermal motor protectors . 184
Annex E (normative) Needle-flame test . 185
Annex F (normative) Capacitors . 186

Annex G (normative) Safety isolating transformers . 188
Annex H (normative) Switches . 189
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 191
Annex J (normative) Coated printed circuit boards . 193
Annex K (informative) Overvoltage categories . 194
Annex L (informative) Guidance for the measurement of clearances and creepage

distances . 195
Annex M (informative) Pollution degree . 198
Annex N (normative) Proof tracking test . 199
Annex O (informative) Selection and sequence of the tests of Clause 30 . 200
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 205
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 207
Annex R (normative) Software evaluation . 210
Annex S (informative) Guidance for the application of this standard on measurement
of power input and current based on the requirements of 10.1 and 10.2 concerning the

representative period . 224
Annex T (normative) UV-C radiation effect on non-metallic materials . 225
Annex U (normative) Appliances intended for remote communication through public
networks . 228
Annex AA (normative) Combination microwave ovens . 232
Annex BB (normative) Requirements for commercial microwave ovenswithout a cavity
door and with conveyor-type means . 234
Annex CC (informative) Overview of the requirements for covers, means of access
and similar . 248
Annex DD (informative) Rationales for the microwave barrier and associated leakage
tests . 250
Annex EE (normative) Microwave ovens intended to be used on board ships . 256
Bibliography . 260
Index of defined terms . 263

Figure 1 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of class II appliances and for parts of class ll construction . 143
Figure 2 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of other than class II appliances or parts of class ll
construction . 144
Figure 3 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral class II appliances and for parts of class ll construction . 145
Figure 4 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral appliances other than those of class II or parts of class ll
construction .
...

IEC 60335-2-90 ®
Edition 5.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-90: Particular requirements for commercial microwave ovens

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-90: Exigences particulières pour les fours à micro-ondes à usage
commercial
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About the IEC
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International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

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IEC 60335-2-90 ®
Edition 5.0 2024-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –

Part 2-90: Particular requirements for commercial microwave ovens

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-90: Exigences particulières pour les fours à micro-ondes à usage

commercial
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20  ISBN 978-2-8322-9185-6

– 2 – IEC 60335-2-90:2024 © IEC 2024
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 10
4 General requirement . 13
5 General conditions for the tests . 13
6 Classification . 14
7 Marking and instructions . 14
8 Protection against access to live parts . 16
9 Starting of motor-operated appliances . 17
10 Power input and current . 17
11 Heating . 17
12 Charging of metal-ion batteries . 20
13 Leakage current and electric strength at operating temperature . 20
14 Transient overvoltages . 20
15 Moisture resistance . 21
16 Leakage current and electric strength . 21
17 Overload protection of transformers and associated circuits . 22
18 Endurance . 22
19 Abnormal operation . 23
20 Stability and mechanical hazards . 25
21 Mechanical strength . 26
22 Construction . 28
23 Internal wiring . 33
24 Components . 33
25 Supply connection and external flexible cords . 33
26 Terminals for external conductors . 34
27 Provision for earthing . 34
28 Screws and connections . 34
29 Clearances, creepage distances and solid insulation . 34
30 Resistance to heat and fire . 34
31 Resistance to rusting . 35
32 Radiation, toxicity and similar hazards . 35
Annexes . 38
Annex A (informative) Routine tests . 39
Annex R (normative) Software evaluation . 41
Annex AA (normative) Combination microwave ovens . 42
Annex BB (normative) Requirements for commercial microwave ovens without a cavity
door and with conveyor-type means . 44
Annex CC (informative) Overview of the requirements for covers, means of access
and similar . 58

Annex DD (informative) Rationales for the microwave barrier and associated leakage
tests . 60
Annex EE (normative) Microwave ovens intended to be used on board ships . 66
Bibliography . 70

Figure 101 – Test rod for door interlock concealment . 36
Figure 102 – Probe for measuring surface temperatures . 36
Figure 103 – Front view of appliance with identification of excluded areas . 37
Figure BB.201 – Splash apparatus . 55
Figure BB.202 – Arrangement for measurement of microwave leakage from access
openings . 56
Figure BB.203 – Examples of definitions of Clause 3 . 57

Table 101 – Maximum temperature rises of external accessible surfaces under normal
operating conditions . 19
Table 102 – Maximum temperature rises of external accessible surfaces for appliances
intended to be used in areas open to the public under normal operating conditions . 20
Table 103 – Number of potatoes . 24
Table BB.201 – Specifications for microwave barriers . 51
Table BB.202 – Assembling torques for screwed connections providing earthing
continuity . 53
Table CC.1 – Overview of the requirements for covers, means of access and similar . 59
Table EE.201 – Assembling torques for screwed connections providing earthing
continuity . 68

– 4 – IEC 60335-2-90:2024 © IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-90: Particular requirements for commercial microwave 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 “I
...