IEC 60335-2-37:2000

INTERNATIONAL IEC
STANDARD
60335-2-37
Fourth edition
2000-02
Safety of household and similar electrical
appliances –
Part 2-37:
Particular requirements for commercial electric
deep fat fryers
Sécurité des appareils électrodomestiques et analogues –
Partie 2-37:
Règles particulières pour les friteuses électriques
à usage collectif
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are

available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base

publication incorporating amendments 1 and 2.

Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is to be found at the following IEC sources:
• IEC web site*
•
Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International
Electrotechnical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL IEC
STANDARD
60335-2-37
Fourth edition
2000-02
Safety of household and similar electrical
appliances –
Part 2-37:
Particular requirements for commercial electric
deep fat fryers
Sécurité des appareils électrodomestiques et analogues –
Partie 2-37:
Règles particulières pour les friteuses électriques
à usage collectif
 IEC 2000  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http://www.iec.ch
Commission Electrotechnique Internationale
PRICE CODE
S
International Electrotechnical Commission
For price, see current catalogue

– 2 – 60335-2-37 © IEC:2000(E)

CONTENTS
Page
FOREWORD . 3

Clause
1 Scope . 5

2 Definitions. 5

3 General requirement . 6
4 General conditions for the tests . 6
5 Void . 7
6 Classification . 7
7 Marking and instructions . 7
8 Protection against access to live parts . 9
9 Starting of motor-operated appliances. 9
10 Power input and current . 10
11 Heating . 10
12 Void . 11
13 Leakage current and electric strength at operating temperature . 11
14 Void . 11
15 Moisture resistance. 11
16 Leakage current and electric strength . 13
17 Overload protection of transformers and associated circuits. 13
18 Endurance .13
19 Abnormal operation. 13
20 Stability and mechanical hazards . 14
21 Mechanical strength. 14
22 Construction .15
23 Internal wiring . 18
24 Components . 18
25 Supply connection and external flexible cords. 18

26 Terminals for external conductors . 19
27 Provision for earthing. 19
28 Screws and connections . 19
29 Creepage distances, clearances and distances through insulation . 19
30 Resistance to heat, fire and tracking . 19
31 Resistance to rusting . 20
32 Radiation, toxicity and similar hazards . 20
Figure 101. 21
Annexes . 22

60335-2-37 © IEC:2000(E) – 3 –

INTERNATIONAL ELECTROTECHNICAL COMMISSION

____________
SAFETY OF HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

Part 2-37: Particular requirements for commercial electric

deep fat fryers
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60335-2-37 has been prepared by subcommittee 61E: Safety of
electrical commercial catering equipment, of IEC technical committee 61: Safety of household
and similar electrical appliances.
If forms the fourth edition of IEC 60335-2-37 and cancels and replaces the third edition,
published in 1994, its amendment 1 (1996) and amendment 2 (1998).
The text of this standard is based on the third edition, amendments 1 and 2 and the following

documents:
FDIS Report on voting
61E/348/FDIS 61E/362/RVD
Full information on the voting for the approval of this part can be found in the report on voting
indicated in the above table.
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 third edition (1991) of that standard.

– 4 – 60335-2-37 © IEC:2000(E)

This part 2 supplements or modifies the corresponding clauses in IEC 60335-1, so as to
convert it into the IEC standard: Safety requirements for commercial electric deep fatfryers.

Where a particular subclause of part 1 is not mentioned in this part 2, that subclause applies
as far as is reasonable. Where this standard states "addition", "modification" or "replacement", the

relevant text in part 1 is to be adapted accordingly.

NOTE 1 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 2.
NOTE 2 Subclauses, figures and notes which are additional to those in part 1 are numbered starting from 101.
A bilingual version of this standard may be issued at a later date.

60335-2-37 © IEC:2000(E) – 5 –

SAFETY OF HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –

Part 2-37: Particular requirements for commercial electric

deep fat fryers
1 Scope
This clause of part 1 is replaced by:

This standard deals with the safety of electrically operated commercial deep fat fryers
rated voltage
including pressurized types not intended for household use, their being not
more than 250 V for single-phase appliances connected between one phase and neutral and
480 V for other appliances.
NOTE 1 These appliances are used for example in kitchens such as in restaurants, canteens, hospitals and
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.
So far as is practicable, this standard deals with the common hazards presented by these
types of appliances.
NOTE 2 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;
– for appliances intended to be used in tropical countries, special 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.
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);
– continuous process appliances for the mass production of food.

2 Definitions
This clause of part 1 is applicable except as follows.
2.2.4 Addition:
rated power input
NOTE The is the sum of the power inputs of all the individual elements in the appliance which
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
2.2.9 Replacement:
normal operation: Operation of the appliance under the following conditions:
The appliance is filled with oil to the minimum indicated level.

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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 which can be expected in normal use taking into account the manufacturer's

instructions.
2.2.101
deep fat fryer
an appliance provided with one or more containers in which the food to be cooked is
immersed in the frying medium. The container(s) may be fixed, removable, lifting, tilting, etc.
The pressure within the container can exceed atmospheric pressure.
2.2.102
indicated level
a mark on the appliance to indicate either the minimum or the maximum liquid level for correct
operation
2.2.103
installation wall
a special fixed construction containing supply facilities for appliances installed in conjunction
with it
2.2.104
rated pressure
the maximum working pressure assigned by the manufacturer to the pressurized part of the
appliance
3 General requirement
This clause of part 1 is applicable except as follows.
Addition:
NOTE 101 The d.c. component in the appliance neutral is limited (Australia).
4 General conditions for the tests
This clause of part 1 is applicable except as follows.

4.5 Addition:
Unless otherwise stated, the tests are carried out with the container in the position of normal
use for frying.
4.10 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 may be needed for test purposes.

60335-2-37 © IEC:2000(E) – 7 –

4.101 Appliances are tested as heating appliances, even if they incorporate a motor.

4.102 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
.
If a part of the appliance or the whole appliance is intended to be used for different functions
covered by different standards, the relevant standard is applied to each function separately,

so far as is reasonable.
4.103 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.
5 Void
6 Classification
This clause of part 1 is applicable except as follows.
6.1 Replacement:
Appliances shall be of class I with respect to protection against electric shock.
Compliance is checked by inspection and by the relevant tests.
NOTE Class 0I appliances are allowed (Japan).
6.2 Addition:
NOTE 101 For appliances intended to be installed in a kitchen, an appropriate degree of protection against
harmful ingress of water is required according to their height of installation (France).
7 Marking and instructions
This clause of part 1 is applicable except as follows.
7.1 Addition:
In addition, appliances shall be marked with

– the water pressure or range of pressures, in kilopascals (kPa), for appliances intended to
be connected to a water supply, unless this is indicated in the instruction sheet,
– the rated pressure, in kilopascals (kPa), on pressurized parts of the appliance.
7.6 Addition:
Add the following symbol:
*
..... equipotentiality (IEC 60417-5021-a)
–––––––––
*
See IEC 60417-1:1998, Graphical symbols for use on equipment – Part 1: Overview and application, and
IEC 60417-2:1998, Graphical symbols for use on equipment – Part 2: Symbol originals

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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 instruction sheet shall include a warning that danger of fire exists if the oil level is below

the minimum indicated level.
The instruction sheet shall include the maximum batch load in kilogrammes.
The instruction sheet shall also include a warning regarding the danger of using old oil,
emphasizing that this will have a reduced flash-point and be more prone to surge boiling.
Attention shall also be drawn to the effect on surge boiling of over-wet food and too large a
charge.
7.12.1 Replacement:
The appliance shall be accompanied by an instruction sheet 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.
Appliances which are provided with an appliance inlet, and are intended to be immersed in
water for cleaning shall be accompanied by an instruction sheet 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 instruction sheet of appliances other than stationary and appliances with detachable
electrical parts, which 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 which 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 instruction sheet shall give recommendations regarding the

rating of protective devices, i.e. earth leakage relays to be installed.
If the appliance is constructed so that it is not protected against water jets, clear and detailed
instructions for the user shall be delivered together with the appliance. It shall be stated in the
instructions that this appliance shall not be cleaned with a water jet.
Compliance is checked by inspection.
7.12.4 Addition:
The instructions for built-in appliances having a separate control panel for several
appliances shall state that the control panel is only to be connected to the specified
appliances in order to avoid a possible hazard.

60335-2-37 © IEC:2000(E) – 9 –

7.15 Addition:
fixed appliances
When it is not practical to place the marking of so that it is visible after the
appliance has been installed, the relevant information shall also be included in the
instructions for use or on an additional label which can be fixed near the appliance after
installation.
fixed appliance built-in appliance
NOTE An example of such a is a .

7.101
Equipotential bonding terminals shall be indicated by the equipotentiality symbol (see 7.6).

These indications shall not be placed on screws, removable washers or other parts which 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 which 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 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

9.1 Fan motors providing a cooling effect in order to comply with the requirements of clause 11
shall start under all voltage conditions which may occur in use.
Compliance is checked by starting the motor three times at a voltage equal to 0,85 times
rated voltage, the motor being at room temperature at the beginning of the test
.
The motor is started each time under the conditions occurring at the beginning of normal
operation or, for automatic appliances, at the beginning of the normal cycle of operation, the
motor being allowed to come to rest between successive starts. 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.
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.
NOTE The supply source must be such that during the test the drop in voltage does not exceed 1 %.

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10 Power input and current
This clause of part 1 is applicable except as follows.

10.1 Addition:
NOTE 101 For appliances having more than one heating unit, the total power input may be determined by

measuring the power input of each heating unit separately (see also 2.2.4).

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.
Addition:
11.3
The temperature of the oil is measured 25 mm below the oil surface in the centre of the oil
container.
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 which 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.
NOTE See also 11.7.
11.7 Replacement:
Appliances are operated until steady conditions are established.
NOTE The duration of the test may consist of more than one cycle of operation.
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.

60335-2-37 © IEC:2000(E) – 11 –

11.8 Addition:
The maximum temperature of the oil shall not exceed 200 °C. During the test, the pressure
relief device shall not operate.

Void
13 Leakage current and electric strength at operating temperature

This clause of part 1 is applicable except as follows.
13.2 Modification:
stationary class I appliances
Instead of the permissible leakage current for , the following
applies:
– for cord and plug connecte
...