IEC 60335-2-37:2017

IEC 60335-2-37 ®
Edition 6.0 2017-03
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 collectif
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IEC 60335-2-37 ®
Edition 6.0 2017-03
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 collectif
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.50 ISBN 978-2-8322-6520-8

– 2 – IEC 60335-2-37:2017 © IEC 2017
CONTENTS
CONTENTS . 2
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 . 10
7 Marking and instructions . 11
8 Protection against access to live parts . 13
9 Starting of motor-operated appliances . 13
10 Power input and current . 14
11 Heating . 14
12 Void . 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 . 23
24 Components . 23
25 Supply connection and external flexible cords . 24
26 Terminals for external conductors . 24
27 Provision for earthing . 24
28 Screws and connections . 24
29 Clearances, creepage distances and solid insulation . 25
30 Resistance to heat and fire . 25
31 Resistance to rusting . 26
32 Radiation, toxicity and similar hazards . 26
Annexes . 28
Annex N (normative) Proof tracking test . 29
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 30
13Leakage current and electric strength at operating temperature . 30
16 Leakage current and electric strength . 30
Bibliography . 31

Figure 101 – Identification of surfaces for temperature measurement . 26
Figure 102 – Probe for measuring surface temperatures . 27
Figure 103 – Splash apparatus . 27

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 . 25

– 4 – IEC 60335-2-37:2017 © IEC 2017
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-
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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
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
This part of International Standard IEC 60335 has been prepared by IEC technical committee
61: Safety of household and similar electrical appliances.
This bilingual version (2019-02) corresponds to the monolingual English version, published in
2017-03.
This sixth edition cancels and replaces the fifth edition published in 2002 including its
Amendment 1 (2008) and its Amendment 2 (2011). It constitutes a technical revision.
The principle changes in this edition as compared with the fifth edition of IEC 60335-2-37 are
as follows (minor changes are not listed):
• stating some wording in the scope more precisely;
• addition of a measurement method for pans in the definition for normal operation;
• new definitions on the topic surface temperature;

• deletion of the paragraph with the warning for dangerous voltages (already covered by
Part 1);
• addition of hot surface symbol IEC 60417-5041;
• addition of instructions and markings on hot surfaces and other topics;
• addition of requirements, measuring methods and thresholds for different materials on hot
surfaces;
• modification on leakage current defining the value for appliances with a power
consumption less than 1 kW;
• modification on the criteria for the stability test;
• addition of a requirement for the construction of stationary appliances with rollers or
castors;
• modification on some points concerning permanent connection to fixed wiring;
• addition of specific requirements concerning types of screws to be used for electrical
connections and connections for earth continuity;
• addition of a figure showing the surfaces to be measured;
• addition of a figure showing the probe for measuring surface temperatures;
• addition of informative Annex P dealing with leakage currents for appliances used in
tropical climates.
The text of this Standard is based on the following documents:
FDIS Report on voting
61/5328/FDIS 61/5384/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
The French version of this standard has not been voted upon.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 60335 series, 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. It was established on the basis of the fifth edition (2010) 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: Safety 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
– 6 – IEC 60335-2-37:2017 © IEC 2017
• 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 of Part 1 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 "http://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 publication 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.
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.
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 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.
– 8 – IEC 60335-2-37:2017 © IEC 2017
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 international Standard 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 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 used for the commercial processing of food, for example in kitchens of
restaurants, canteens, hospitals and in commercial enterprises such as bakeries, butcheries, etc.
The electrical part of appliances making use of other forms of energy is also within the scope
of this standard.
As far as is practicable, this standard deals with the common hazards presented by these
types of appliances.
NOTE 102 Attention is drawn to the fact that
• for appliances intended to be used in vehicles or on board ships or aircraft, additional requirements may 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.
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, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 1:
Bolts, screws and studs
ISO 3506-2, Mechanical properties of corrosion-resistant stainless steel fasteners – Part 2:
Nuts
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.
3.1.4 Addition:
Note 1 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 incorporated in the appliance are operated in the intended manner under the most
severe conditions that can be expected in normal use taking into account the manufacturer's
instructions.
3.101
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 be fixed, removable, lifting, tilting, etc.
Note 2 to entry: The pressure within the container can exceed atmospheric pressure.
3.102
indicated level
mark on the appliance to indicate either the minimum or the maximum liquid level for correct
operation
3.103
installation wall
special fixed construction containing supply facilities for appliances installed in conjunction
with it
3.104
rated pressure
the maximum working pressure assigned by the manufacturer to the pressurized part of the
appliance
3.105
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

– 10 – IEC 60335-2-37:2017 © IEC 2017
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.
3.106
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
3.107
adjacent surface
surface adjacent to a functional surface and which can become hot through conduction
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 be needed for test purposes.
5.101 Appliances are tested as heating appliances, even if they incorporate a motor.
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:
The 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 (2002-10)] caution, hot surface
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.
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.

– 12 – IEC 60335-2-37:2017 © IEC 2017
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 too large a
charge.
If symbol IEC 60417-5021 (2002-10) or symbol IEC 60417-5041 (2002-10) is 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 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 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, 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 shall not be placed on screws, removable washers or other parts that can
be removed when conductors are being connected.
Compliance is checked by inspection.
7.102 Appliances or the detachable electrical parts of appliances intended to be partially
immersed in water for cleaning shall be marked with a line that clearly indicates the maximum
depth of immersion, together with the substance of the following warning:
Do not immerse beyond this line.
If there is any seam or seal that causes the appliance or part not to withstand the treatment
specified in 15.102, the line indicating the maximum depth of immersion shall be at least
50 mm below any such seam or seal when the appliance or the part is in the position in which
it is to be cleaned.
Compliance is checked by inspection and measurement.
7.103 Appliances 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.

– 14 – IEC 60335-2-37:2017 © IEC 2017
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 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
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 devices of the motor shall not operate.
10 Power input and current
This clause of Part 1 is applicable except as follows.
10.1 Addition:
For appliances having more than one heating unit, the total power input may be determined
by measuring the power input of each heating unit separately (see also 3.1.4).
11 Heating
This clause of Part 1 is applicable except as follows.
11.2 Addition:
Appliances intended to be fixed to the floor and appliances with a mass greater than 40 kg
and not provided with rollers, castors or similar means are installed in accordance with the
manufacturer's instructions. If no instructions are given, these appliances are considered as
appliances normally placed on the floor.
11.2 Addition:
The temperature of the fat or oil is measured 25 mm below the surface in the center 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 is used to measure the temperature rises of external accessible
± 1 N to the surface
surfaces specified in Table 101. The probe is applied with a force of 4 N
in such a way that the best possible contact between the probe and the surface is ensured.
The measurement is performed after a contact period of 30 s.
The probe may be held in place using a laboratory stand clamp or similar device. Any
measuring instrument giving the same results as the probe may be used.
11.4 Replacement:
Appliances are operated under normal operation such that the total power input of the
appliance is 1,15 times rated power input. If it is not possible to switch on all heating
elements at the same time, the test is made with each of the combinations that the switch
arrangement will allow, the highest load possible with each switching arrangement being in
circuit.
If the appliance is provided with a control that limits the total power input, the test is made
with whichever combination of heating units, as may be selected by the control, imposes the
most severe 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 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 Addition:
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.
The maximum temperature of the fat or oil shall not exceed 200 °C.
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.

– 16 – IEC 60335-2-37:2017 © IEC 2017
Table 101 – Maximum temperature rises for specified external
accessible surfaces under normal operating conditions
a b
Surface Temperature rise of external accessible surfaces
K
Bare metal 48
c
Coated metal 59
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) may exceed the limits by up to 25 K, but the relevant part shall then be
marked with symbol IEC 60417-5041 (2002-10) or the equivalent text. The temperature rise on lids may
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 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
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
...