IEC 60335-2-50:2021
(Main)Household and similar electrical appliances - Safety - Part 2-50: Particular requirements for commercial electric bains-marie
Household and similar electrical appliances - Safety - Part 2-50: Particular requirements for commercial electric bains-marie
IEC 60335-2-50:2021 deals with the safety of electrically operated commercial bains-marie, 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 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 aircraft, 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;
- for appliances intended to be used outdoors, additional requirements can be necessary.
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;
- battery-operated appliances;
- appliances for heating liquids for household use covered by IEC 60335-2-15 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.
This fifth edition cancels and replaces the fourth edition published in 2002, Amendment 1: 2007 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, 10.1, 11.7, 16.2, 20.1, 20.101, 21.101, 22.101, 23.3, 27.2);
c) clarifications to some test specifications have been made (7.102, 9.101, 11.4, 15.1.1, 15.2, 19.1, 20.1);
d) introduction of requirements for appliances intended for use in areas open to the public, including external accessible surface temperatures (Clause 1, 7.12, 11.8, Table 102);
e) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
f) exclusion of battery-operated appliances;
g) relocation of cleaning instructions from 7.12.1 to 7.12;
h) relocation of 24.101 to 22.108;
i) conciliation of the text of IEC 60335-2-50 with other standards under IEC/TC61/MT32.
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 2-50: Exigences particulières pour les bains-marie électriques à usage commercial
L'IEC 60335-2-50:2021 traite de la sécurité des bains-marie électriques à usage commercial, 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 lieux ouverts 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 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;
- pour les appareils destinés à être utilisés en extérieur, des exigences supplémentaires peuvent être nécessaires.
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 appareils alimentés par batteries;
- aux appareils de chauffage des liquides destinés à un usage domestique couverts par l'IEC 60335-2-15 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.
Cette cinquième édition annule et remplace la quatrième édition parue en 2002, l'Amendement 1:2007 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, 10.1, 11.7, 16.2, 20.1, 20.101, 21.101, 22.101, 23.3, 27.2);
c) clarification de certaines modalités d'essais (7.102, 9.101, 11.4, 15.1.1, 15.2, 19.1, 20.1);
d) introduction d'exigences pour les appareils destinés à être utilisés dans des lieux ouverts au public, y compris les températures des surfaces accessibles extérieures (Article 1, 7.12, 11.8, Tableau 102);
e) clarification de la norme applicable aux appareils destinés à être utilisés par des usagers non avertis (Article 1, 7.12);
f) exclusion des appareils alimentés par batteries;
g) déplacement des instructions pour le nettoyage du 7.12.1 au 7.12;
h) déplacement du 24.101 au 22.108;
i) alignement du texte de l'IEC 60335-2-50 sur d'autres normes sous l'IEC/TC61/MT32.
La présente Partie 2 doit être utilisée
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IEC 60335-2-50 ®
Edition 5.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
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Household and similar electrical appliances – Safety –
Part 2-50: Particular requirements for commercial electric bains-marie
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IEC 60335-2-50 ®
Edition 5.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-50: Particular requirements for commercial electric bains-marie
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.20 ISBN 978-2-8322-4093-9
– 2 – IEC 60335-2-50:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 11
6 Classification . 11
7 Marking and instructions . 11
8 Protection against access to live parts . 14
9 Starting of motor-operated appliances . 14
10 Power input and current . 15
11 Heating . 15
12 Void 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 . 21
17 Overload protection of transformers and associated circuits . 21
18 Endurance . 21
19 Abnormal operation . 21
20 Stability and mechanical hazards . 22
21 Mechanical strength . 22
22 Construction . 22
23 Internal wiring . 24
24 Components . 24
25 Supply connection and external flexible cords . 24
26 Terminals for external conductors . 25
27 Provision for earthing . 25
28 Screws and connections . 25
29 Clearances, creepage distances and solid insulation . 26
30 Resistance to heat and fire . 26
31 Resistance to rusting . 27
32 Radiation, toxicity and similar hazards . 27
Annexes . 31
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 32
Annex N (normative) Proof tracking test .
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 33
Bibliography . 34
Figure 103 101 – Probe for measuring surface temperatures . 27
Figure 102 – Identification of surfaces for temperature measurement . 28
Figure 101 103 – Splash apparatus. 30
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 16
Table 102 – Maximum temperature rises of external accessible surfaces for appliances
intended to be installed in areas open to the public under normal operating conditions . 17
Table 102 103 – Assembling torques for screwed connections providing earthing
continuity . 26
– 4 – IEC 60335-2-50:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-50: Particular requirements for commercial electric bains-marie
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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
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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) 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 60335-2-50:2002+AMD1:2007+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 60335-2-50 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002, Amendment 1: 2007
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,
10.1, 11.7, 16.2, 20.1, 20.101, 21.101, 22.101, 23.3, 27.2);
c) clarifications to some test specifications have been made (7.102, 9.101, 11.4, 15.1.1, 15.2,
19.1, 20.1);
d) introduction of requirements for appliances intended for use in areas open to the public,
including external accessible surface temperatures (Clause 1, 7.12, 11.8, Table 102);
e) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
f) exclusion of battery-operated appliances;
g) relocation of cleaning instructions from 7.12.1 to 7.12;
h) relocation of 24.101 to 22.108;
i) conciliation of the text of IEC 60335-2-50 with other standards under IEC/TC61/MT32.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6373/FDIS 61/6423/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 bains-
marie.
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:
– 6 – IEC 60335-2-50:2021 RLV © IEC 2021
– 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.
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 of 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 60335-2-50:2021 RLV © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-50: Particular requirements for commercial electric bains-marie
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 bains-marie
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.
NOTE 101 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, 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 aircraft, 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;
– for appliances intended to be used outdoors, additional requirements may can be necessary.
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;
– battery-operated appliances;
– appliances for heating liquids for household use covered by IEC 60335-2-15 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.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
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 grades and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grades 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:
Open-well and wet-heat-type bains-marie are filled with water to the indicated level and
topped up during the test in accordance with the manufacturer's instructions. The appliance is
operated with any control intended to be operated by the user set at maximum. If the water
boils, the control is then adjusted to the lowest setting that maintains simmering. No covers or
containers are fitted.
Dry-heat-type bains-marie are operated with any controls set at the maximum. Empty food
containers are placed in the well but with the container covers removed.
Combined-type appliances are operated under the most unfavourable conditions.
Motors and detachable electrical parts incorporated in the appliance are operated in the
intended manner under the most severe unfavourable conditions that can be expected in normal
use taking into account the manufacturer's instructions.
– 10 – IEC 60335-2-50:2021 RLV © IEC 2021
3.5 Definitions relating to types of appliances
3.5.101
bain-marie
appliance with a well that is used for the storage of hot food in containers prior to serving
Note 1 to entry: The containers are indirectly heated by hot air, steam or water in the well.
3.5.102
open-well-type bain-marie
appliance where the food containers rest in water in a heated well
3.5.103
wet-heat-type bain-marie
appliance where the fitted food containers are heated by steam generated within the appliance
Note 1 to entry: The pressure in the well or steam generator does not differ significantly from atmospheric pressure.
3.5.104
dry-heat-type bain-marie
appliance where the fitted food containers are heated by warm air generated within the
appliance
3.6 Definitions relating to parts of an appliance
3.1076.101
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.
3.1086.102
adjacent surface
surface that is adjacent to a functional surface and which can become hot through conduction
3.8 Definitions relating to miscellaneous matters
3.1058.101
indicated level
mark on the appliance to indicate the maximum liquid level for correct operation
3.1068.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
3.8.103
area open to the public
area in which the general public, including children, can have access
Note to entry: Examples are canteens and self-service restaurants.
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 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:
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 or Table 102 and for which the provisions of footnote "b" to Table 101 or Table 102
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
– 12 – IEC 60335-2-50:2021 RLV © IEC 2021
7.12 Addition:
The manufacturer shall declare that the appliance is also intended to be used in an area open
to the public or, if the appliance is not suitable for use in an area open to the public, the
instruction shall include the substance of the following warning:
WARNING: This appliance shall not be installed where the public has access.
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.
Appliances that are provided with an appliance inlet and are intended to be partially or
completely immersed in water for cleaning shall be accompanied by an instruction stating that
the connector shall be removed before the appliance is cleaned and that the appliance inlet
shall be dried before the appliance is used again.
The instructions of appliances, other than stationary appliances, and appliances with
detachable electrical parts that are not intended to be partially or completely immersed in
water for cleaning, shall state that the appliance or part shall not be immersed.
If any of symbols IEC 60417-1-5021 (2002-10) and or IEC 60417-5041 (2002-10) are marked
on the appliance, its meaning shall be explained.
The instructions shall include the substance of the following warning:
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the bains-
marie.
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 be
clearly stated in the instructions.
The instructions shall include the substance of the following:
– This appliance is not intended to be used by laymen in household and similar applications
such as:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• in hotels, motels and other residential type environments;
• bed and breakfast type environments.
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.
Appliances that are provided with an appliance inlet and are intended to be partially or
completely immersed in water for cleaning shall be accompanied by an instruction stating that
the connector shall be removed before the appliance is cleaned and that the appliance inlet
shall be dried before the appliance is used again.
The instructions of appliances other than stationary appliances and appliances with detachable
electrical parts that are not intended to be partially or completely immersed in water for
cleaning, shall state that the appliance or part must not be immersed.
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.
If a stationary appliance is intended to be moved for cleaning, this shall be stated.
For stationary appliances equipped with rollers or castors or intended to be moved for
cleaning, the instructions shall state the substance of the following.
This appliance is to be connected with flexible connections for equipotential bonding and
connection to services such as electricity supply, water supply, gas supply and steam supply
such that the appliance can be moved in the direction required for cleaning a distance not
less than the dimension of the appliance in the direction of movement plus 500 mm without
the flexible connections becoming taut or being subject to strain.
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 symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
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:
– 14 – IEC 60335-2-50:2021 RLV © IEC 2021
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 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.
7.102 Appliances or the detachable electrical parts of appliances intended to be partially
immersed in water for cleaning shall be marked with a line that clearly indicates the maximum
depth of immersion, together with the substance of the following warning:
Do not immerse beyond this line.
If there is any seam or seal that causes the appliance or part not to withstand the treatment
specified in 15.102, the line indicating the maximum depth of immersion shall be at least 50 mm
below any such seam or seal when the appliance or the part is in the position in which it is to
be cleaned.
Compliance is checked by inspection and measurement.
7.103 Appliances Containers intended to be filled by hand or a manually operated tap shall be
marked with an indicated level.
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.
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.
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 motor appliance 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 a voltage equal
to 0,85 times the 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 the 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.
NOTE The supply source is such that during the test the drop in voltage does not exceed 1 %.
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.
11.3 Addition:
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 103 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 the 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
severe 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 the rated voltage. In this case, only
– 16 – IEC 60335-2-50:2021 RLV © IEC 2021
the temperature rises of motors, transformers or electronic circuits rise of the components for
which the temperature rise limits were exceeded are measured.
11.7 Replacement:
Appliances are operated until steady conditions are established.
Steady conditions are considered to exist 60 min after reaching the temperatures defined for
normal operation.
When an appliance is assembled in combination with, equipped with or incorporating
accessories or other appliances, the interaction shall be covered if they are provided to operate
simultaneously as stated by the manufacturer or by a common control.
NOTE 101 The duration of the test may consist of more than one cycle of operation.
11.8 Addition:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.
For appliances intended to be installed in areas open to the public, the temperature shall not
exceed the values shown in Table 102.
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
b
Temperature rise of external accessible surfaces
a
Surface
K
Bare metal 48
c
Coated metal
Glass and ceramic 65
d, e
Plastic and plastic coating > 0,4 mm
a
Temperature rises are not measured on:
– the underside of appliances intended to be used on a working surface or floor;
– the rear surface of appliances;
– surfaces that are inaccessible to a 75 mm diameter probe having a hemispherical end;
– functional surfaces and adjacent surfaces.
b
The temperature rise on external accessible surfaces up to a distance of 100 mm from adjacent surfaces of
the appliance (see Figure 102) may exceed the limits by up to 25 K, but the relevant part shall then be marked
with symbol IEC 60417-5041 (2002-10) or the equivalent text.
c
Metal is considered coated when a coating having a minimum thickness of 90 µm made by of enamel or non-
substantially plastic coating is used.
d
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
e
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
ceramic material apply.
Table 102 – Maximum temperature rises of external accessible surfaces
for appliances intended to be installed in areas open to the public
under normal operating conditions
a
Temperature rise of external accessible surfaces
K
Surface
Appliances and parts situated Appliances and parts situated
not more than 850 mm above more than 850 mm above the
b
the floor after installation
floor after installation
Bare metal 38 42
c
42 49
Coated metal
51 56
Glass and ceramic
d, e
58 62
Plastic and plastic coating > 0,4 mm
a
The following surfaces or elements shall not be taken into consideration:
– functional surfaces;
– handles or control knobs including keypads, keyboards and the like: part of
...
IEC 60335-2-50 ®
Edition 5.1 2025-08
INTERNATIONAL
STANDARD
CONSOLIDATED VERSION
Household and similar electrical appliances - Safety -
Part 2-50: Particular requirements for commercial electric bains-marie
ICS 97.040.20 ISBN 978-2-8327-0703-6
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CONTENTS
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 General requirement . 9
5 General conditions for the tests . 10
6 Classification . 10
7 Marking and instructions . 10
8 Protection against access to live parts . 13
9 Starting of motor-operated appliances . 13
10 Power input and current . 14
11 Heating . 14
12 Charging of metal-ion batteries . 16
13 Leakage current and electric strength at operating temperature . 16
14 Transient overvoltages . 17
15 Moisture resistance . 17
16 Leakage current and electric strength . 19
17 Overload protection of transformers and associated circuits . 19
18 Endurance . 19
19 Abnormal operation . 19
20 Stability and mechanical hazards . 20
21 Mechanical strength . 20
22 Construction . 20
23 Internal wiring . 22
24 Components . 22
25 Supply connection and external flexible cords . 22
26 Terminals for external conductors . 23
27 Provision for earthing . 23
28 Screws and connections . 23
29 Clearances, creepage distances and solid insulation . 24
30 Resistance to heat and fire . 24
31 Resistance to rusting . 24
32 Radiation, toxicity and similar hazards . 24
Annexes . 28
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 . 30
Bibliography . 31
Figure 101 – Probe for measuring surface temperatures . 25
Figure 102 – Identification of surfaces for temperature measurement . 26
Figure 103 – Splash apparatus . 27
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 15
Table 102 – Maximum temperature rises of external accessible surfaces for appliances
intended to be installed in areas open to the public under normal operating conditions . 16
Table 103 – Assembling torques for screwed connections providing earthing continuity . 24
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household and similar electrical appliances - Safety -
Part 2-50: Particular requirements for commercial electric bains-marie
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
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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) 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
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch 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 60335-2-50 edition 5.1 contains the fifth edition (2021-11) [documents 61/6373/FDIS and
61/6423/RVD] and its amendment 1 (2025-08) [documents 61/7461/FDIS and 61/7491/RVD].
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 60335-2-50 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002, Amendment 1: 2007
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,
10.1, 11.7, 16.2, 20.1, 20.101, 21.101, 22.101, 23.3, 27.2);
c) clarifications to some test specifications have been made (7.102, 9.101, 11.4, 15.1.1, 15.2,
19.1, 20.1);
d) introduction of requirements for appliances intended for use in areas open to the public,
including external accessible surface temperatures (Clause 1, 7.12, 11.8, Table 102);
e) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
f) exclusion of battery-operated appliances;
g) relocation of cleaning instructions from 7.12.1 to 7.12;
h) relocation of 24.101 to 22.108;
i) conciliation of the text of IEC 60335-2-50 with other standards under IEC/TC61/MT32.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6373/FDIS 61/6423/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 bains-
marie.
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.
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).
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 of 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.
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 bains-marie,
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.
These appliances are not intended for household and similar purposes. They are used:
– by experts or instructed persons for commercial processing of food in areas that are not
areas open to the public, for example in kitchens of restaurants, canteens, hospitals and
in commercial enterprises such as bakeries and butcheries; or
– by laypersons in areas open to the public, for example hotel/motel common areas,
canteens and self-service restaurants.
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 aircraft, 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;
– for appliances intended to be used outdoors, additional requirements can be necessary.
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;
attery-operated appliances;
– b
– appliances for heating liquids for household use covered by IEC 60335-2-15 and used in
the following environments by laymen:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• by clients in hotels rooms, motels rooms and other residential type environments;
• bed and breakfast type environments.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
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 grades and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grades 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 following conditions:
Open-well and wet-heat-type bains-marie are filled with water to the indicated level and
topped up during the test in accordance with the manufacturer's instructions. The appliance is
operated with any control intended to be operated by the user set at maximum. If the water
boils, the control is then adjusted to the lowest setting that maintains simmering. No covers or
containers are fitted.
Dry-heat-type bains-marie are operated with any controls set at the maximum. Empty food
containers are placed in the well but with the container covers removed.
Combined-type appliances are operated under the most unfavourable conditions.
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.
3.5 Definitions relating to types of appliances
3.5.101
bain-marie
appliance with a well that is used for the storage of hot food in containers prior to serving
Note 1 to entry: The containers are indirectly heated by hot air, steam or water in the well.
3.5.102
open-well-type bain-marie
appliance where the food containers rest in water in a heated well
3.5.103
wet-heat-type bain-marie
appliance where the fitted food containers are heated by steam generated within the appliance
Note 1 to entry: The pressure in the well or steam generator does not differ significantly from atmospheric pressure.
3.5.104
dry-heat-type bain-marie
appliance where the fitted food containers are heated by warm air generated within the
appliance
3.6 Definitions relating to parts of an appliance
3.6.101
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.
3.6.102
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 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
3.8.103
area open to the public
area in which the general public, including children, can have access
Note 1 to entry: Examples are canteens and self-service restaurants.
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:
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 or Table 102 and for which the provisions of footnote "b" to Table 101 or Table 102
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
7.12 Addition:
The manufacturer shall declare that the appliance is also intended to be used in an area open
to the public or, if the appliance is not suitable for use in an area open to the public, the
instruction shall include the substance of the following warning:
WARNING: This appliance shall not be installed where the public has access.
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.
Appliances that are provided with an appliance inlet and are intended to be partially or
completely immersed in water for cleaning shall be accompanied by an instruction stating that
the connector shall be removed before the appliance is cleaned and that the appliance inlet
shall be dried before the appliance is used again.
The instructions of appliances, other than stationary appliances, and appliances with
detachable electrical parts that are not intended to be partially or completely immersed in
water for cleaning, shall state that the appliance or part shall not be immersed.
If any of symbols IEC 60417-1-5021 (2002-10) or IEC 60417-5041 (2002-10) are marked on the
appliance, its meaning shall be explained.
The instructions shall include the substance of the following warning:
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the bains-
marie.
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 be
clearly stated in the instructions.
The instructions shall include the substance of the following:
– This appliance is not intended to be used by laymen in household and similar applications
such as:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• in hotels, motels and other residential type environments;
• bed and breakfast type environments.
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.
If a stationary appliance is intended to be moved for cleaning, this shall be stated.
For stationary appliances equipped with rollers or castors or intended to be moved for
cleaning, the instructions shall state the substance of the following.
This appliance is to be connected with flexible connections for equipotential bonding and
connection to services such as electricity supply, water supply, gas supply and steam supply
such that the appliance can be moved in the direction required for cleaning a distance not
less than the dimension of the appliance in the direction of movement plus 500 mm without
the flexible connections becoming taut or being subject to strain.
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 symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
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 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.
7.102 Appliances or the detachable electrical parts of appliances intended to be partially
immersed in water for cleaning shall be marked with a line that clearly indicates the maximum
depth of immersion, together with the substance of the following warning:
Do not immerse beyond this line.
If there is any seam or seal that causes the appliance or part not to withstand the treatment
specified in 15.102, the line indicating the maximum depth of immersion shall be at least 50 mm
below any such seam or seal when the appliance or the part is in the position in which it is to
be cleaned.
Compliance is checked by inspection and measurement.
7.103 Containers intended to be filled by hand or a manually operated tap shall be marked
with an indicated level.
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.
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 the 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 the 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.
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.
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 the 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 the 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:
Appliances are operated until steady conditions are established.
Steady conditions are considered to exist 60 min after reaching the temperatures defined for
normal operation.
When an appliance is assembled in combination with, equipped with or incorporating
accessories or other appliances, the interaction shall be covered if they are provided to operate
simultaneously as stated by the manufacturer or by a common control.
11.8 Addition:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.
For appliances intended to be installed in areas open to the public, the temperature shall not
exceed the values shown in Table 102.
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
b
Temperature rise of external accessible surfaces
a
Surface
K
Bare metal 48
c
Coated metal
Glass and ceramic 65
d, e
Plastic and plastic coating > 0,4 mm
NOTE The temperature rise limits of handles, knobs, grips, keyboards, keypads and similar parts are specified in
Table 3.
a
Temperature rises are not measured on:
– the underside of appliances intended to be used on a working surface or floor;
– the rear surface of appliances;
– surfaces that are inaccessible to a 75 mm diameter probe having a hemispherical end;
– functional surfaces and adjacent surfaces.
b
The temperature rise on external accessible surfaces up to a distance of 100 mm from adjacent surfaces of
the appliance (see Figure 102) may exceed the limits by up to 25 K, but the relevant part shall then be marked
with symbol IEC 60417-5041 (2002-10) or the equivalent text.
c
Metal is considered coated when a coating having a minimum thickness of 90 µm made of enamel or non-
substantially plastic coating is used.
d
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
e
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
ceramic material apply.
Table 102 – Maximum temperature rises of external accessible surfaces
for appliances intended to be installed in areas open to the public
under normal operating conditions
a
Temperature rise of external accessible surfaces
K
Surface
Appliances and parts situated Appliances and parts situated
not more than 850 mm above more than 850 mm above the
b
the floor after installation
floor after installation
Bare metal 38 42
c
42 49
Coated metal
51 56
Glass and ceramic
d, e 58 62
Plastic and plastic coating > 0,4 mm
NOTE The temperature rise limits of handles, knobs, grips, keyboards, keypads and similar parts are specified in
Table 3.
a
The following surfaces or elements shall not be taken into consideration:
– functional surfaces;
– handles or control knobs including keypads, keyboards and the like: part of the equipment that a user
needs to touch to operate or adjust the equipment. The equipment has to be installed according to the
manufacturer’s instructions;
– surfaces within 5 mm of touch controls regardless of their shape;
– surfaces within 25 mm of the outline of the functional surfaces;
– underside surfaces that are not accessible to a 75 mm diameter probe having a hemispherical end;
– lids and covers.
b
When the required values are not met, the maximum temperature rise shall not be higher than two times the
values indicated, but the relevant part shall then be marked with symbol IEC 60417-5041 (2002-10) or the
equivalent text.
The temperature rise on external accessible surfaces up to a dis
...
IEC 60335-2-50 ®
Edition 5.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-50: Particular requirements for commercial electric bains-marie
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-50: Exigences particulières pour les bains-marie électriques à usage
commercial
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IEC 60335-2-50 ®
Edition 5.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-50: Particular requirements for commercial electric bains-marie
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-50: Exigences particulières pour les bains-marie électriques à usage
commercial
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20 ISBN 978-2-8322-1045-6
– 2 – IEC 60335-2-50:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 9
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 11
6 Classification . 11
7 Marking and instructions . 11
8 Protection against access to live parts . 14
9 Starting of motor-operated appliances . 14
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 . 20
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 . 21
22 Construction . 21
23 Internal wiring . 23
24 Components . 23
25 Supply connection and external flexible cords . 23
26 Terminals for external conductors . 24
27 Provision for earthing . 24
28 Screws and connections . 24
29 Clearances, creepage distances and solid insulation . 25
30 Resistance to heat and fire . 25
31 Resistance to rusting . 25
32 Radiation, toxicity and similar hazards . 25
Annexes . 29
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 30
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 31
Bibliography . 32
Figure 101 – Probe for measuring surface temperatures . 26
Figure 102 – Identification of surfaces for temperature measurement . 27
Figure 103 – Splash apparatus . 28
Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 16
Table 102 – Maximum temperature rises of external accessible surfaces for appliances
intended to be installed in areas open to the public under normal operating conditions . 17
Table 103 – Assembling torques for screwed connections providing earthing continuity . 25
– 4 – IEC 60335-2-50:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-50: Particular requirements for commercial electric bains-marie
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
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
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.
IEC 60335-2-50 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2002, Amendment 1: 2007
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,
10.1, 11.7, 16.2, 20.1, 20.101, 21.101, 22.101, 23.3, 27.2);
c) clarifications to some test specifications have been made (7.102, 9.101, 11.4, 15.1.1, 15.2,
19.1, 20.1);
d) introduction of requirements for appliances intended for use in areas open to the public,
including external accessible surface temperatures (Clause 1, 7.12, 11.8, Table 102);
e) clarification of applicable standard for appliances for use by laymen (Clause 1, 7.12);
f) exclusion of battery-operated appliances;
g) relocation of cleaning instructions from 7.12.1 to 7.12;
h) relocation of 24.101 to 22.108;
i) conciliation of the text of IEC 60335-2-50 with other standards under IEC/TC61/MT32.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6373/FDIS 61/6423/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 bains-
marie.
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 60335-2-50:2021 © 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 of 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 60335-2-50:2021 © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-50: Particular requirements for commercial electric bains-marie
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 bains-marie,
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 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 aircraft, 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;
– for appliances intended to be used outdoors, additional requirements can be necessary.
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;
– battery-operated appliances;
– appliances for heating liquids for household use covered by IEC 60335-2-15 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.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
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 grades and property classes
ISO 3506-2, Fasteners – Mechanical properties of corrosion-resistant stainless steel fasteners
– Part 2: Nuts with specified grades 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 following conditions:
Open-well and wet-heat-type bains-marie are filled with water to the indicated level and
topped up during the test in accordance with the manufacturer's instructions. The appliance is
operated with any control intended to be operated by the user set at maximum. If the water
boils, the control is then adjusted to the lowest setting that maintains simmering. No covers or
containers are fitted.
Dry-heat-type bains-marie are operated with any controls set at the maximum. Empty food
containers are placed in the well but with the container covers removed.
Combined-type appliances are operated under the most unfavourable conditions.
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.
– 10 – IEC 60335-2-50:2021 © IEC 2021
3.5 Definitions relating to types of appliances
3.5.101
bain-marie
appliance with a well that is used for the storage of hot food in containers prior to serving
Note 1 to entry: The containers are indirectly heated by hot air, steam or water in the well.
3.5.102
open-well-type bain-marie
appliance where the food containers rest in water in a heated well
3.5.103
wet-heat-type bain-marie
appliance where the fitted food containers are heated by steam generated within the appliance
Note 1 to entry: The pressure in the well or steam generator does not differ significantly from atmospheric pressure.
3.5.104
dry-heat-type bain-marie
appliance where the fitted food containers are heated by warm air generated within the
appliance
3.6 Definitions relating to parts of an appliance
3.6.101
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.
3.6.102
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 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
3.8.103
area open to the public
area in which the general public, including children, can have access
Note 1 to entry: Examples are canteens and self-service restaurants.
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:
If appliances have external accessible surfaces, for which temperature rise limits are specified
in Table 101 or Table 102 and for which the provisions of footnote "b" to Table 101 or Table 102
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
– 12 – IEC 60335-2-50:2021 © IEC 2021
7.12 Addition:
The manufacturer shall declare that the appliance is also intended to be used in an area open
to the public or, if the appliance is not suitable for use in an area open to the public, the
instruction shall include the substance of the following warning:
WARNING: This appliance shall not be installed where the public has access.
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.
Appliances that are provided with an appliance inlet and are intended to be partially or
completely immersed in water for cleaning shall be accompanied by an instruction stating that
the connector shall be removed before the appliance is cleaned and that the appliance inlet
shall be dried before the appliance is used again.
The instructions of appliances, other than stationary appliances, and appliances with
detachable electrical parts that are not intended to be partially or completely immersed in
water for cleaning, shall state that the appliance or part shall not be immersed.
If any of symbols IEC 60417-1-5021 (2002-10) or IEC 60417-5041 (2002-10) are marked on the
appliance, its meaning shall be explained.
The instructions shall include the substance of the following warning:
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the bains-
marie.
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 be
clearly stated in the instructions.
The instructions shall include the substance of the following:
– This appliance is not intended to be used by laymen in household and similar applications
such as:
• staff kitchen areas in shops, offices and other working environments;
• farm houses;
• in hotels, motels and other residential type environments;
• bed and breakfast type environments.
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.
If a stationary appliance is intended to be moved for cleaning, this shall be stated.
For stationary appliances equipped with rollers or castors or intended to be moved for
cleaning, the instructions shall state the substance of the following.
This appliance is to be connected with flexible connections for equipotential bonding and
connection to services such as electricity supply, water supply, gas supply and steam supply
such that the appliance can be moved in the direction required for cleaning a distance not
less than the dimension of the appliance in the direction of movement plus 500 mm without
the flexible connections becoming taut or being subject to strain.
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 symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
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 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.
– 14 – IEC 60335-2-50:2021 © IEC 2021
Compliance is checked by inspection.
7.102 Appliances or the detachable electrical parts of appliances intended to be partially
immersed in water for cleaning shall be marked with a line that clearly indicates the maximum
depth of immersion, together with the substance of the following warning:
Do not immerse beyond this line.
If there is any seam or seal that causes the appliance or part not to withstand the treatment
specified in 15.102, the line indicating the maximum depth of immersion shall be at least 50 mm
below any such seam or seal when the appliance or the part is in the position in which it is to
be cleaned.
Compliance is checked by inspection and measurement.
7.103 Containers intended to be filled by hand or a manually operated tap shall be marked
with an indicated level.
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.
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 the 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 the 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.
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.
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 the 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 the 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:
Appliances are operated until steady conditions are established.
Steady conditions are considered to exist 60 min after reaching the temperatures defined for
normal operation.
– 16 – IEC 60335-2-50:2021 © IEC 2021
When an appliance is assembled in combination with, equipped with or incorporating
accessories or other appliances, the interaction shall be covered if they are provided to operate
simultaneously as stated by the manufacturer or by a common control.
11.8 Addition:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.
For appliances intended to be installed in areas open to the public, the temperature shall not
exceed the values shown in Table 102.
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
b
Temperature rise of external accessible surfaces
a
Surface
K
Bare metal 48
c
Coated metal
Glass and ceramic 65
d, e
Plastic and plastic coating > 0,4 mm
a
Temperature rises are not measured on:
– the underside of appliances intended to be used on a working surface or floor;
– the rear surface of appliances;
– surfaces that are inaccessible to a 75 mm diameter probe having a hemispherical end;
– functional surfaces and adjacent surfaces.
b
The temperature rise on external accessible surfaces up to a distance of 100 mm from adjacent surfaces of
the appliance (see Figure 102) may exceed the limits by up to 25 K, but the relevant part shall then be marked
with symbol IEC 60417-5041 (2002-10) or the equivalent text.
c
Metal is considered coated when a coating having a minimum thickness of 90 µm made of enamel or non-
substantially plastic coating is used.
d
The temperature rise limit of plastic also applies for plastic material having a metal finish of thickness less than
0,1 mm.
e
When the thickness of the plastic coating does not exceed 0,4 mm, the temperature rise limits of coated metal
for underlying metal apply or the temperature rise limits for glass or ceramic material for underlying glass or
ceramic material apply.
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