IEC 60335-2-37:2021

Household and similar electrical appliances - Safety - Part 2-37: Particular requirements for commercial electric doughnut fryers and deep fat fryers

IEC 60335-2-37:2021 deals with the safety of electrically operated commercial deep fat fryers and doughnut fryers including pressurized types with a pressure not exceeding 50 kPa and a pressure volume litres product not exceeding 200, their rated voltage being not more than 250 V for single-phase appliances connected between one phase and neutral and 480 V for other appliances. These appliances are not intended for household and similar purposes. They are used for commercial processing of food in areas not open to the public, for example in kitchens of restaurants, canteens, hospitals and in commercial enterprises such as bakeries and butcheries. 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;
- in many countries, additional requirements are specified for pressure appliances.
This standard does not apply to
- appliances designed exclusively for industrial purposes;
- appliances intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour or gas);
- appliances for continuous mass production of food;
- battery-operated appliances.
This seventh edition cancels and replaces the sixth edition published in 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 or modified (Clause 1, 7.15, 15.102, 19.1, 22.101, 22.104, 22.105, 22.110, 27.2, 30.101);
c) conciliation of the text of IEC 60335-2-37 with other standards under IEC/TC61/MT32;
d) exclusion of battery-operated appliances and appliances used in areas open to the public (Clause 1);
e) clarification of the testing procedure in 15.1.1;
f) relocation of cleaning instructions from 7.12.1 to 7.12;
g) relocation of 24.101 to 22.121;
h) clarification on the test conditions in 19.1 and 23.3;
i) clarifications in the requirements in 25.3.
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 2-37: Exigences particulières pour les friteuses et les friteuses à beignets électriques à usage commercial

L'IEC 60335-2-37:2021 traite de la sécurité des friteuses et friteuses à beignets électriques à usage commercial, y compris celles du type à pression dont la pression ne dépasse pas 50 kPa et dont le produit de la pression par le volume en litres ne dépasse pas 200, dont la tension assignée est inférieure ou égale à 250 V pour les appareils monophasés raccordés entre un conducteur de phase et le conducteur de neutre et à 480 V pour les autres appareils. Ces appareils ne sont pas destinés à un usage domestique ou analogue. Ils sont destinés à un usage commercial pour le traitement des aliments dans des zones non ouvertes au public, par exemple dans les cuisines de restaurants, les cantines, les hôpitaux et les entreprises commerciales, telles que les boulangeries et les boucheries. La partie électrique des appareils qui utilise d'autres formes d'énergie est également comprise dans le domaine d'application de la présente norme. Dans la mesure du possible, la présente norme traite des dangers courants que présentent ces types d'appareils. L'attention est attirée sur le fait que:
- pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d'avions, des exigences supplémentaires peuvent être nécessaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées par les organismes nationaux de la santé, par les organismes nationaux responsables de la protection des travailleurs, par les organismes nationaux responsables de l'alimentation en eau et par des organismes similaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées pour les appareils sous pression.
La présente norme ne s'applique pas
- aux appareils prévus exclusivement pour des usages industriels;
- aux appareils destinés à être utilisés dans des locaux qui présentent des conditions particulières, telles que la présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz);
- aux appareils conçus pour la production continue en masse d'aliments;
- aux appareils alimentés par batteries.
Cette septième édition annule et remplace la sixième édition parue en 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 ou modification de certaines notes (Article 1, 7.15, 15.102, 19.1, 22.101, 22.104, 22.105, 22.110, 27.2, 30.101);
c) alignement du texte de l'IEC 60335-2-37 sur d'autres normes sous l'IEC/TC61/MT32;
d) exclusion des appareils alimentés par batteries et des appareils utilisés dans des lieux ouverts au public (Article 1);
e) clarification de la procédure d'essai en 15.1.1;
f) déplacement des instructions pour le nettoyage du 7.12.1 au 7.12;
g) déplacement du 24.101 au 22.121;
h) clarification des conditions d'essai en 19.1 et en 23.3;
i) clarification des exigences du 25.3.
La présente Partie 2 doit être utilisée conjointement avec la dernière édition de l'IEC 60335-1 et ses amendements, sauf si cette édition l'exclut. Dans ce cas, la dernière édition qui n'exclut pas la présente Partie 2 est utilisée. Elle a été établie sur la base de la sixième édition (2020) de cette norme.

General Information

• Status: Published
• Publication Date: 09-Feb-2025
• ICS: 97.040.50 - Small kitchen appliances
• Technical Committee: TC 61 - Safety of household and similar electrical appliances
• Drafting Committee: MT 32 - TC 61/MT 32
• Current Stage: PPUB - Publication issued
• Start Date: 23-Nov-2021
• Completion Date: 03-Dec-2021

Relations

• Amended By: IEC 60335-2-37:2021/AMD1:2025 - Amendment 1 - Household and similar electrical appliances - Safety - Part 2-37: Particular requirements for commercial electric doughnut fryers and deep fat fryers
• Effective Date: 26-Apr-2024
• Revises: IEC 60335-2-37:2017 - Household and similar electrical appliances - Safety - Part 2-37: Particular requirements for commercial electric doughnut fryers and deep fat fryers
• Effective Date: 05-Sep-2023

Overview

IEC 60335-2-37:2021 specifies safety requirements for electrically operated commercial deep fat fryers and doughnut fryers (including certain pressurized types). It covers appliances with rated voltages up to 250 V for single-phase (phase to neutral) and 480 V for other appliances, and pressurized versions with a pressure not exceeding 50 kPa and a pressure–volume product not exceeding 200. This Part 2 standard is intended for commercial food-service equipment used in non-public areas (restaurants, canteens, hospitals, bakeries, butcheries) and is to be applied together with IEC 60335-1.

Key topics and requirements

• Scope and exclusions: excludes household appliances, battery-operated units, appliances for continuous mass production, and equipment for corrosive/explosive atmospheres. Appliances for vehicles, ships or aircraft may require additional rules.
• Safety alignment: text aligned with IEC 60335-1:2020; this edition updates testing, marking and construction requirements.
• Electrical safety: protection against access to live parts, leakage current and electric strength tests, transient overvoltages, and insulation/clearance/creepage specifications.
• Thermal and heating controls: requirements for heating elements, temperature limits for accessible surfaces, thermostats, over-temperature protection and stability under normal and abnormal operation.
• Mechanical and construction: stability, mechanical strength, internal wiring, components, earthing provision and assembly torques for protective connections.
• Moisture and endurance testing: moisture resistance, splash and endurance tests that reflect commercial use.
• Marking and instructions: mandatory markings, cleaning and maintenance instructions, and user safety guidance for commercial environments.
• Pressure and special types: requirements for pressurized fryers within the defined pressure limits; note that national pressure- vessel regulations may add further obligations.

Applications

• Ensures safe design and manufacture of commercial doughnut fryers and deep fat fryers used in professional kitchens.
• Provides the basis for type testing, certification and conformity assessment by test laboratories and certification bodies.
• Supports procurement and compliance checks by food-service operators, equipment specifiers and safety auditors.

Who should use this standard?

• Manufacturers and designers of commercial frying equipment
• Test laboratories and conformity assessment bodies
• Regulatory and inspection authorities, safety engineers, and compliance officers
• Purchasing teams for restaurants, hospitals, catering and bakery operations

Related standards

• IEC 60335-1 (general requirements for the safety of household and similar electrical appliances) - to be used in conjunction with this Part 2.
• National regulations (health, labor, water supply, and pressure appliance laws) - may impose additional requirements.

Keywords: IEC 60335-2-37, commercial deep fat fryers, doughnut fryers, electrical safety standard, fryer safety, IEC 60335-1, commercial kitchen equipment, conformity testing.

Standards Content (Sample)

IEC 60335-2-37 ®
Edition 7.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-37: Particular requirements for commercial electric doughnut fryers and
deep fat fryers
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IEC 60335-2-37 ®
Edition 7.0 2021-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-37: Particular requirements for commercial electric doughnut fryers and
deep fat fryers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.50 ISBN 978-2-8322-4064-9

– 2 – IEC 60335-2-37:2021 RLV © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 10
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 . 14
11 Heating . 15
12 Void 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 . 21
22 Construction . 21
23 Internal wiring . 24
24 Components . 24
25 Supply connection and external flexible cords . 25
26 Terminals for external conductors . 25
27 Provision for earthing . 26
28 Screws and connections . 26
29 Clearances, creepage distances and solid insulation . 27
30 Resistance to heat and fire . 27
31 Resistance to rusting . 27
32 Radiation, toxicity and similar hazards . 28
Annexes . 29
Annex B (informative) Battery-operated appliances, separable batteries and
detachable batteries for battery-operated appliances . 33
Annex N (normative) Proof tracking test .
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 35
Bibliography . 36

Figure 102 101 – Probe for measuring surface temperatures . 28
Figure 101 102 – Identification of surfaces for temperature measurement . 29
Figure 103 – Splash apparatus . 31

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 16
Table 102 – Assembling torques for screwed connections providing earthing continuity . 27

– 4 – IEC 60335-2-37:2021 RLV © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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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 60335-2-37:2017. 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 60335-2-37 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This seventh edition cancels and replaces the sixth edition published in 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 or modified (Clause 1, 7.15, 15.102,
19.1, 22.101, 22.104, 22.105, 22.110, 27.2, 30.101);
c) conciliation of the text of IEC 60335-2-37 with other standards under IEC/TC61/MT32;
d) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
e) clarification of the testing procedure in 15.1.1;
f) relocation of cleaning instructions from 7.12.1 to 7.12;
g) relocation of 24.101 to 22.121;
h) clarification on the test conditions in 19.1 and 23.3;
i) clarifications in the requirements in 25.3.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6376/FDIS 61/6426/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 doughnut
fryers and deep fat fryers.
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 60335-2-37:2021 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 from the date of publication.

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 and generic standards 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. For example, in the case of temperature requirements
for surfaces on many appliances, generic standards, such as ISO 13732-1 for hot surfaces, are not applicable in
addition to Part 1 or part 2 standards.
An appliance that complies with the text of this standard will not necessarily be considered to
comply with the safety principles of the standard if, when examined and tested, it is found to
have other features that impair the level of safety covered by these requirements.
An appliance employing materials or having forms of construction differing from those detailed
in the requirements of this standard may be examined and tested according to the intent of the
requirements and, if found to be substantially equivalent, may be considered to comply with the
standard.
NOTE 3 Standards dealing with non-safety aspects of household appliances are:
– IEC standards published by TC 59 concerning methods for measuring performance;
– CISPR 11, CISPR 14-1 and relevant IEC 61000-3 series standards concerning electromagnetic emissions;
– CISPR 14-2 concerning electromagnetic immunity;
– IEC standards published by TC 111 concerning environmental matters.

– 8 – IEC 60335-2-37:2021 RLV © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

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 deep fat fryers
and doughnut fryers including pressurized types with a pressure not exceeding 50 kPa and a
pressure volume litres product of not exceeding 200. These appliances are 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 the commercial processing of food in areas not open to the public, for example in
kitchens of restaurants, canteens, hospitals and in commercial enterprises such as bakeries,
and butcheries, 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;
– in many countries, additional requirements are specified for pressure appliances.
NOTE 103 This standard does not apply to
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;
– battery-operated appliances.
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:
The appliance is filled with oil or fat according to the manufacturer's instructions up to the
minimum indicated level.
The thermal control is set at the maximum setting. Lids, if provided, are left in the open position
or removed unless the manufacturer's instructions indicate that the appliance is designed for
operation with the lid closed.
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.
3.1041.101
rated pressure
maximum working pressure assigned by the manufacturer to the pressurized part of the
appliance
3.5 Definitions relating to types of appliances
3.5.101
deep fat fryer
appliance provided with one or more containers in which the food to be cooked is immersed in
the frying medium
Note 1 to entry: The container(s) may can be fixed, removable, lifting, tilting, etc.
Note 2 to entry: The pressure within the container can exceed atmospheric pressure.

– 10 – IEC 60335-2-37:2021 RLV © IEC 2021
3.1055.102
doughnut fryer
appliance with large surface area and flat container in which the bakery products e. g. donuts
are prepared in fat or oil by floating
Note 1 to entry: The doughnut fryer is generally not equipped with a cold area. The appliance can be delivered with
a removable bakery product basket, a lifting or turning device.
3.6 Definitions relating to parts of an appliance
3.1066.101
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.
3.1076.102
adjacent surface
surface that is adjacent to a functional surface and which can become hot through conduction
3.8 Definitions relating to miscellaneous matters
3.1028.101
indicated level
mark on the appliance to indicate either the minimum or the maximum liquid level for correct
operation
3.1038.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.5 Addition:
The tests are carried out with the container in the position of normal use for frying.
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.
5.103 Appliances are initially filled with unused vegetable oil. The series of relevant tests are
carried out with this oil, unused oil being added as necessary to maintain a constant level.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
If appliances have external accessible surfaces or lids, for which temperature rise limits are
specified in Table 101 and for which the provisions of footnote b to Table 101 apply, then the
appliance shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the
following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041
caution, hot surface
(2002-10)]
7.10 Addition:
Devices controlling the tilting process of appliances with tilting parts shall be clearly marked to
show the direction of movement.
7.12 Addition:
The instructions shall include a warning that danger of fire exists if the fat or oil level is below
the minimum indicated level. To avoid a fire hazard, the instruction for appliances which are
intended to be used with solid fat shall include information how to melt the fat.

– 12 – IEC 60335-2-37:2021 RLV © IEC 2021
The instructions shall include the kind of frying medium (fat or oil) and the maximum batch load
in kilograms.
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 a warning regarding the danger of using old fat or oil, emphasizing
that this will have a reduced flash-point and be more prone to surge boiling.
The instructions shall also include the substance of the following warnings:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the deep
fat fryer.
Attention shall also be drawn to the effect on surge boiling of over-wet food and of a too large
charge.
Appliances that are provided with an appliance inlet, and are intended to be 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.
Unless the appliance or part is intended to be partially or completely immersed in water for
cleaning, the instructions for appliances with detachable electrical parts and appliances, other
than stationary appliances, shall state that the appliance or part must not be immersed.
If any of symbols IEC 60417-5021 (2002-10) or IEC 60417-5041 (2002-10) is are marked on
the appliance, its meaning shall be explained.
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. 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 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.
The installation instruction shall include a statement that the appliance has to be installed and
used in such a way that any water cannot contact the fat or oil.
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.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle in symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
7.15 Addition:
The marking specified for external accessible surfaces shall be visible when the appliance is
operated as in normal use, including when actuating any switch, adjusting any control or
opening a lid or door. It shall not be placed on a functional surface or adjacent surface.
Modification:
For fixed appliances, the marking of the name or trademark or identification mark of the
manufacturer or responsible vendor and the model or type reference shall be marked on the
appliance and, if not visible when the appliance is installed as in normal use, shall be included
in the instructions or on an additional label that can be fixed near the appliance after installation.
NOTE 101 An example of such an appliance is a built-in hob.
7.101 Equipotential bonding terminals shall be marked with symbol IEC 60417-5021
(2002-10).
These indications 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.

– 14 – IEC 60335-2-37:2021 RLV © IEC 2021
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 shall be marked with the minimum and maximum fat or oil levels.
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 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 the ambient room
temperature specified in 5.7 after each test.
The appliance is started under the conditions occurring at the beginning of normal operation
or, for automatic appliances, at the beginning of the normal cycle of operation, a voltage equal
to 0,85 times rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protection 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 can 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.
11.23 Addition:
The temperature of the fat or oil is measured 25 mm below the surface in the centre of the
container but not closer than 10 mm to the heating element.
Where the external accessible surfaces are suitably flat and access permits, then the test
probe of Figure 102 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 can be held in place using a laboratory stand clamp or similar device. Any
measuring instrument giving the same results as the probe may can 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 rated voltage. In this case, only 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.
Tilting motors are operated immediately after the appliance has reached steady conditions, for
one full cycle of operation (one cycle being from the fully up position to the fully down position
and back to the fully up position).

– 16 – IEC 60335-2-37:2021 RLV © IEC 2021
Lifting motors are similarly operated, but for three such cycles.
11.8 Addition Modification:
The temperature of the oil or fat is measured at least 10 mm from the wall of the container and
10 mm above the bottom. However, the temperature is measured 10 mm above the highest
point of heating elements if they are located in the container.
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101 and the pressure relief device shall not operate.
Addition:
During the test, the pressure relief device shall not operate.
The maximum temperature of the fat or oil shall not exceed 200 °C.
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 101 Figure 102) may can 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. The temperature rise on lids may
can exceed the limits, 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.
12 Void Charging of metal-ion batteries
This clause of Part 1 is not applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.

13.2 Modification:
Instead of the permissible leakage current for stationary class I appliances, the following
applies:
0,75 mA or 1 mA per kW rated power input
– for cord and plug connected appliances
of the appliance with a maximum of 10 mA,
whichever is higher;
– for other appliances 0,75 mA or 1 mA per kW rated power input
of the appliance with no maximum, whichever
is higher.
For portable class I appliances, instead
...

IEC 60335-2-37 ®
Edition 7.1 2025-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-37: Particular requirements for commercial electric doughnut fryers and
deep fat fryers
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IEC 60335-2-37 ®
Edition 7.1 2025-02
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-37: Particular requirements for commercial electric doughnut fryers and
deep fat fryers
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 97.040.50 ISBN 978-2-8327-0218-5
REDLINE VERSION – 2 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 10
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 . 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 . 18
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 . 21
22 Construction . 21
23 Internal wiring . 24
24 Components . 24
25 Supply connection and external flexible cords . 25
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 . 30
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 . 32
Bibliography . 33

Figure 101 – Probe for measuring surface temperatures . 27

© IEC 2025
Figure 102 – Identification of surfaces for temperature measurement . 28
Figure 103 – Splash apparatus . 29

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 16
Table 102 – Assembling torques for screwed connections providing earthing continuity . 26

REDLINE VERSION – 4 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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. IEC
shall not be held responsible for identifying any or all such patent rights.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60335-2-37 edition 7.1 contains the seventh edition (2021-11) [documents
61/6376/FDIS and 61/6426/RVD] and its amendment 1 (2025-02) [documents 61/7243/CDV
and 61/7350/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red
text. A separate Final version with all changes accepted is available in this publication.

© IEC 2025
IEC 60335-2-37 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This seventh edition cancels and replaces the sixth edition published in 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 or modified (Clause 1, 7.15, 15.102,
19.1, 22.101, 22.104, 22.105, 22.110, 27.2, 30.101);
c) conciliation of the text of IEC 60335-2-37 with other standards under IEC/TC61/MT32;
d) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
e) clarification of the testing procedure in 15.1.1;
f) relocation of cleaning instructions from 7.12.1 to 7.12;
g) relocation of 24.101 to 22.121;
h) clarification on the test conditions in 19.1 and 23.3;
i) clarifications in the requirements in 25.3.
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 doughnut
fryers and deep fat fryers.
When a particular subclause of Part 1 is not mentioned in this Part 2, that subclause applies as
far as is reasonable. When this standard states "addition", "modification" or "replacement", the
relevant text in Part 1 is to be adapted accordingly.
NOTE 2 The following numbering system is used:
– subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1;
– unless notes are in a new subclause or involve notes in Part 1, they are numbered starting from 101, including
those in a replaced clause or subclause;
– additional annexes are lettered AA, BB, etc.
NOTE 3 The following print types are used:
– requirements: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
REDLINE VERSION – 6 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
Words in bold in the text are defined in Clause 3. When a definition concerns an adjective, the
adjective and the associated noun are also in bold.
The committee has decided that the contents of this document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
NOTE 4 The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation nationally
not earlier than 12 months from the date of publication.

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

REDLINE VERSION – 8 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

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 deep fat fryers
and doughnut fryers including pressurized types with a pressure not exceeding 50 kPa and a
pressure volume litres product not exceeding 200, their rated voltage being not more than
250 V for single-phase appliances connected between one phase and neutral and 480 V for
other appliances including direct current (DC) supplied appliances.
These appliances are not intended for household and similar purposes. They are used for
commercial processing of food in areas not open to the public, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries and
butcheries.
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;
– in many countries, additional requirements are specified for pressure appliances.
This standard does not apply to
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;.
– battery-operated appliances.
2 Normative references
This clause of Part 1 is applicable except as follows.
Addition:
IEC 60584-1, Thermocouples – Part 1: EMF specifications and tolerances

© IEC 2025
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:
The appliance is filled with oil or fat according to the manufacturer's instructions up to the
minimum indicated level.
The thermal control is set at the maximum setting. Lids, if provided, are left in the open position
or removed unless the manufacturer's instructions indicate that the appliance is designed for
operation with the lid closed.
Motors and detachable electrical parts incorporated in the appliance are operated under the
most unfavourable conditions that can be expected in normal use taking into account the
manufacturer's instructions.
3.1.101
rated pressure
maximum working pressure assigned by the manufacturer to the pressurized part of the
appliance
3.5 Definitions relating to types of appliances
3.5.101
deep fat fryer
appliance provided with one or more containers in which the food to be cooked is immersed in
the frying medium
Note 1 to entry: The container(s) can be fixed, removable, lifting, tilting, etc.
Note 2 to entry: The pressure within the container can exceed atmospheric pressure.

REDLINE VERSION – 10 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
3.5.102
doughnut fryer
appliance with large surface area and flat container in which the bakery products e. g. donuts
are prepared in fat or oil by floating
Note 1 to entry: The doughnut fryer is generally not equipped with a cold area. The appliance can be delivered
with a removable bakery product basket, a lifting or turning device.
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 either the minimum or the maximum liquid level for correct
operation
3.8.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.5 Addition:
The tests are carried out with the container in the position of normal use for frying.
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.
© IEC 2025
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.
5.103 Appliances are initially filled with unused vegetable oil. The series of relevant tests are
carried out with this oil, unused oil being added as necessary to maintain a constant level.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
If appliances have external accessible surfaces or lids, for which temperature rise limits are
specified in Table 101 and for which the provisions of footnote b to Table 101 apply, then the
appliance shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the
following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041
caution, hot surface
(2002-10)]
7.10 Addition:
Devices controlling the tilting process of appliances with tilting parts shall be clearly marked to
show the direction of movement.
7.12 Addition:
The instructions shall include a warning that danger of fire exists if the fat or oil level is below
the minimum indicated level. To avoid a fire hazard, the instruction for appliances which are
intended to be used with solid fat shall include information how to melt the fat.

REDLINE VERSION – 12 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
The instructions shall include the kind of frying medium (fat or oil) and the maximum batch load
in kilograms.
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 a warning regarding the danger of using old fat or oil, emphasizing
that this will have a reduced flash-point and be more prone to surge boiling.
The instructions shall also include the substance of the following warnings:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the deep
fat fryer.
Attention shall also be drawn to the effect on surge boiling of over-wet food and of a too large
charge.
Appliances that are provided with an appliance inlet, and are intended to be 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.
Unless the appliance or part is intended to be partially or completely immersed in water for
cleaning, the instructions for appliances with detachable electrical parts and appliances, other
than stationary appliances, shall state that the appliance or part must not be immersed.
If any of symbols IEC 60417-5021 (2002-10) or IEC 60417-5041 (2002-10) are marked on the
appliance, its meaning shall be explained.
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. Instructions for user maintenance, for example cleaning, shall
also be given. They shall include a statement that the appliance is not to be cleaned with a
water jet or a steam cleaner.
For appliances that are permanently connected to fixed wiring and for which leakage currents
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.

© IEC 2025
The installation instruction shall include a statement that the appliance has to be installed and
used in such a way that any water cannot contact the fat or oil.
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.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle in symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
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.
REDLINE VERSION – 14 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
Compliance is checked by inspection and measurement.
7.103 Appliances shall be marked with the minimum and maximum fat or oil levels.
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 rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protective devices of the motor shall not operate.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
For appliances having more than one heating unit, the total power input can 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.

© IEC 2025
11.3 Addition:
The temperature of the fat or oil is measured 25 mm below the surface in the centre of the
container but not closer than 10 mm to the heating element.
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 can be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe can 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 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.
Tilting motors are operated immediately after the appliance has reached steady conditions, for
one full cycle of operation (one cycle being from the fully up position to the fully down position
and back to the fully up position).
Lifting motors are similarly operated, but for three such cycles.
11.8 Modification:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.

REDLINE VERSION – 16 – IEC 60335-2-37:2021+AMD1:2025 CSV
© IEC 2025
Addition:
During the test, the pressure relief device shall not operate.
The maximum temperature of the fat or oil shall not exceed 200 °C.
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) can 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. The temperature rise on lids can exceed the
limits, 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.
12 Charging of metal-ion batteries
This clause of Part 1 is not applicable.
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.2 Modification:
Instead of the permissible leakage current for stationary class I appliances, the following
applies:
– for cord and plug connected appliances 0,75 mA or 1 mA per kW rated power input
of the appliance with a maximum of 10 mA,
whichever is higher;
0,75 mA or 1 mA per kW rated power input
– for other appliances
of the appliance with no maximum, whichever
is higher.
© IEC 2025
For portable class I appliances, instead of the permissible leakage current, the following
applies:
– for cord and plug connected appliances 0,75 mA or 1 mA per kW rated power input
of the appliance with a maximum of 10 mA,
whichever is higher.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is applicable except as follows.
15.1.1 Addition:
In addition, appliances, except those marked IPX5 and IPX6, are subjected for 5 min to the
following splash test.
The apparatus shown in Figure 103 is used. The appliance is placed in normal position of use
and adjustable feet shall be set in accordance with the instruction for use to the most
unfavourable height.
For appliances normally used on the floor the bowl is placed on the floor and is moved around
in such a way as to splash the appliance from all direct
...

IEC 60335-2-37 ®
Edition 7.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-37: Particular requirements for commercial electric doughnut fryers and
deep fat fryers
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-37: Exigences particulières pour les friteuses et les friteuses à beignets
électriques à usage commercial

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IEC 60335-2-37 ®
Edition 7.0 2021-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –

Part 2-37: Particular requirements for commercial electric doughnut fryers and

deep fat fryers
Appareils électrodomestiques et analogues – Sécurité –

Partie 2-37: Exigences particulières pour les friteuses et les friteuses à beignets

électriques à usage commercial

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.50 ISBN 978-2-8322-1044-7

– 2 – IEC 60335-2-37:2021 © IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 General requirement . 10
5 General conditions for the tests . 10
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 . 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 . 18
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 . 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 . 26
32 Radiation, toxicity and similar hazards . 27
Annexes . 30
Annex B (informative) Battery-operated appliances, separable batteries and
detachable batteries for battery-operated appliances . 31
Annex P (informative) Guidance for the application of this standard to appliances used
in tropical climates . 32
Bibliography . 33

Figure 101 – Probe for measuring surface temperatures . 27

Figure 102 – Identification of surfaces for temperature measurement . 28
Figure 103 – Splash apparatus . 29

Table 101 – Maximum temperature rises for specified external accessible surfaces
under normal operating conditions . 16
Table 102 – Assembling torques for screwed connections providing earthing continuity . 26

– 4 – IEC 60335-2-37:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

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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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 60335-2-37 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This seventh edition cancels and replaces the sixth edition published in 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 or modified (Clause 1, 7.15, 15.102,
19.1, 22.101, 22.104, 22.105, 22.110, 27.2, 30.101);
c) conciliation of the text of IEC 60335-2-37 with other standards under IEC/TC61/MT32;
d) exclusion of battery-operated appliances and appliances used in areas open to the public
(Clause 1);
e) clarification of the testing procedure in 15.1.1;
f) relocation of cleaning instructions from 7.12.1 to 7.12;
g) relocation of 24.101 to 22.121;
h) clarification on the test conditions in 19.1 and 23.3;
i) clarifications in the requirements in 25.3.
The text of this International Standard is based on the following documents:
Draft Report on voting
61/6376/FDIS 61/6426/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 doughnut
fryers and deep fat fryers.
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 60335-2-37:2021 © 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 from the date of publication.

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

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

– 8 – IEC 60335-2-37:2021 © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-37: Particular requirements for commercial electric
doughnut fryers and deep fat fryers

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 deep fat fryers
and doughnut fryers including pressurized types with a pressure not exceeding 50 kPa and a
pressure volume litres product not exceeding 200, their rated voltage being not more than
250 V for single-phase appliances connected between one phase and neutral and 480 V for
other appliances.
These appliances are not intended for household and similar purposes. They are used for
commercial processing of food in areas not open to the public, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries and
butcheries.
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;
– in many countries, additional requirements are specified for pressure appliances.
This standard does not apply to
– appliances designed exclusively for industrial purposes;
– appliances intended to be used in locations where special conditions prevail, such as the
presence of a corrosive or explosive atmosphere (dust, vapour or gas);
– appliances for continuous mass production of food;
– battery-operated appliances.
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:
The appliance is filled with oil or fat according to the manufacturer's instructions up to the
minimum indicated level.
The thermal control is set at the maximum setting. Lids, if provided, are left in the open position
or removed unless the manufacturer's instructions indicate that the appliance is designed for
operation with the lid closed.
Motors and detachable electrical parts incorporated in the appliance are operated under the
most unfavourable conditions that can be expected in normal use taking into account the
manufacturer's instructions.
3.1.101
rated pressure
maximum working pressure assigned by the manufacturer to the pressurized part of the
appliance
3.5 Definitions relating to types of appliances
3.5.101
deep fat fryer
appliance provided with one or more containers in which the food to be cooked is immersed in
the frying medium
Note 1 to entry: The container(s) can be fixed, removable, lifting, tilting, etc.
Note 2 to entry: The pressure within the container can exceed atmospheric pressure.

– 10 – IEC 60335-2-37:2021 © IEC 2021
3.5.102
doughnut fryer
appliance with large surface area and flat container in which the bakery products e. g. donuts
are prepared in fat or oil by floating
Note 1 to entry: The doughnut fryer is generally not equipped with a cold area. The appliance can be delivered
with a removable bakery product basket, a lifting or turning device.
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 either the minimum or the maximum liquid level for correct
operation
3.8.102
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction with
it
4 General requirement
This clause of Part 1 is applicable.
5 General conditions for the tests
This clause of Part 1 is applicable except as follows.
5.5 Addition:
The tests are carried out with the container in the position of normal use for frying.
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.
5.103 Appliances are initially filled with unused vegetable oil. The series of relevant tests are
carried out with this oil, unused oil being added as necessary to maintain a constant level.
6 Classification
This clause of Part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
6.2 Addition:
Appliances normally used on a table shall be at least IPX3. Other appliances shall be at least
IPX4.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Addition:
Appliances shall be marked with the rated pressure, in kilopascals (kPa), on pressurized parts
of the appliance.
If appliances have external accessible surfaces or lids, for which temperature rise limits are
specified in Table 101 and for which the provisions of footnote b to Table 101 apply, then the
appliance shall be marked with symbol IEC 60417-5041 (2002-10), or with the substance of the
following:
Caution: Hot surfaces.
7.6 Addition:
[symbol IEC 60417-5041
caution, hot surface
(2002-10)]
7.10 Addition:
Devices controlling the tilting process of appliances with tilting parts shall be clearly marked to
show the direction of movement.
7.12 Addition:
The instructions shall include a warning that danger of fire exists if the fat or oil level is below
the minimum indicated level. To avoid a fire hazard, the instruction for appliances which are
intended to be used with solid fat shall include information how to melt the fat.

– 12 – IEC 60335-2-37:2021 © IEC 2021
The instructions shall include the kind of frying medium (fat or oil) and the maximum batch load
in kilograms.
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 a warning regarding the danger of using old fat or oil, emphasizing
that this will have a reduced flash-point and be more prone to surge boiling.
The instructions shall also include the substance of the following warnings:
WARNING: Do not open drain cocks or other emptying devices until the pressure has been
reduced to approximately atmospheric pressure.
WARNING: Opening the drain cock will lead to the outflow of the hot contents of the deep
fat fryer.
Attention shall also be drawn to the effect on surge boiling of over-wet food and of a too large
charge.
Appliances that are provided with an appliance inlet, and are intended to be 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.
Unless the appliance or part is intended to be partially or completely immersed in water for
cleaning, the instructions for appliances with detachable electrical parts and appliances, other
than stationary appliances, shall state that the appliance or part must not be immersed.
If any of symbols IEC 60417-5021 (2002-10) or IEC 60417-5041 (2002-10) are marked on the
appliance, its meaning shall be explained.
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. Instructions for user maintenance, for example cleaning, shall
also be given. They shall include a statement that the appliance is not to be cleaned with a
water jet or a steam cleaner.
For appliances that are permanently connected to fixed wiring and for which leakage currents
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.

The installation instruction shall include a statement that the appliance has to be installed and
used in such a way that any water cannot contact the fat or oil.
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.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several appliances
shall state that the control panel is only to be connected to the specified appliances in order to
avoid a possible hazard.
7.12.9 Not applicable.
7.14 Addition:
The height of the triangle in symbol IEC 60417-5041 (2002-10) shall be at least 15 mm.
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.
– 14 – IEC 60335-2-37:2021 © IEC 2021
Compliance is checked by inspection and measurement.
7.103 Appliances shall be marked with the minimum and maximum fat or oil levels.
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 rated voltage being applied to the input terminals of the appliance.
For appliances provided with motors having other than centrifugal starting switches, this test is
repeated at a voltage equal to 1,06 times rated voltage being applied to the input terminals of
the appliance.
The tests are carried out three times.
In all cases, the motor shall start and it shall function in such a way that safety is not affected
and overload protective devices of the motor shall not operate.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
For appliances having more than one heating unit, the total power input can 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:
The temperature of the fat or oil is measured 25 mm below the surface in the centre of the
container but not closer than 10 mm to the heating element.
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 can be held in place using a laboratory stand clamp or similar device. Any measuring
instrument giving the same results as the probe can 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 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.
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.
Tilting motors are operated immediately after the appliance has reached steady conditions, for
one full cycle of operation (one cycle being from the fully up position to the fully down position
and back to the fully up position).
Lifting motors are similarly operated, but for three such cycles.
11.8 Modification:
During the test, the temperature rises are monitored continuously and shall not exceed the
values shown in Table 3 and Table 101.
Addition:
During the test, the pressure relief device shall not operate.

– 16 – IEC 60335-2-37:2021 © IEC 2021
The maximum temperature of the fat or oil shall not exceed 200 °C.
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) can 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. The temperature rise on lids can exceed the
limits, 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 pla
...