IEC 60335-2-104:2021

IEC 60335-2-104 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-104: Particular requirements for appliances to recover and/or recycle
refrigerant from air conditioning and refrigeration equipment
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IEC 60335-2-104 ®
Edition 2.0 2021-05
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –

Part 2-104: Particular requirements for appliances to recover and/or recycle

refrigerant from air conditioning and refrigeration equipment

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 27.200; 71.100.45 ISBN 978-2-8322-9784-1

– 2 – IEC 60335-2-104:2021 © 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 . 10
7 Marking and instructions . 11
8 Protection against access to live parts . 12
9 Starting of motor-operated appliances . 13
10 Power input and current . 13
11 Heating . 13
12 Void . 17
13 Leakage current and electric strength at operating temperature . 17
14 Transient overvoltages . 17
15 Moisture resistance . 17
16 Leakage current and electric strength . 18
17 Overload protection of transformers and associated circuits . 18
18 Endurance . 18
19 Abnormal operation . 18
20 Stability and mechanical hazards . 23
21 Mechanical strength . 23
22 Construction . 26
23 Internal wiring . 32
24 Components . 33
25 Supply connection and external flexible cords . 33
26 Terminals for external conductors . 33
27 Provision for earthing . 33
28 Screws and connections . 34
29 Clearances, creepage distances and solid insulation . 34
30 Resistance to heat and fire . 34
31 Resistance to rusting . 34
32 Radiation, toxicity and similar hazards . 34
Annexes . 36
Annex AA (normative) Temperature and pressure test . 37
Annex BB (normative) Compatibility requirements . 39
Annex CC (normative) Pressure tests . 40
CC.1 General . 40
CC.2 Pressure test value determined under testing carried out in Clause 11. 40
CC.3 Pressure test value determined under testing carried out in Clause 19. 40

CC.4 Pressure test value determined under testing carried out under standstill
conditions . 40
CC.5 Fatigue test option for Clause CC.2 and CC.4 . 41
Annex DD (normative) Leak simulation tests . 43
DD.1 General . 43
DD.2 Test methods . 43
Annex EE (normative) Manual – Installation and operating instructions . 45
Bibliography . 47

Figure 101 – Supply circuit for locked-rotor test of a motor of the single-phase type . 35

Table 1 – Temperature limits . 14
Table 2 – Maximum winding temperature . 19
Table 3 – Maximum abnormal temperature . 22
Table 4 − High side pressure for strength tests . 30
Table 5 – Low side pressure for strength tests . 30
Table BB.1 – Alternate values of time and temperature for the compatibility test . 39

– 4 – IEC 60335-2-104:2021 © IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-104: Particular requirements for appliances to recover and/or
recycle refrigerant from air conditioning and refrigeration equipment

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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any equipment
declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60335-2-104 has been prepared by subcommittee 61D: Appliances for air-conditioning for
household and similar purposes, of IEC technical committee 61: Safety of household and similar
electrical appliances. It is an International Standard.
This second edition cancels and replaces the first edition published in 2003. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Clause 1 – The scope has been edited to reflect that "appliance" in this document means
recovery and/or recycle equipment to recover and/or recycle refrigerant from air-
conditioning and refrigeration equipment.
b) Clause 2 – Normative references were added.
c) Clause 3 – Some definitions were deleted, some were added.
d) Subclause 7.1 – Some markings were deleted, some were added.

e) Subclause 7.6 – Symbols were added for “read operator’s manual”, “operator’s manual;
operating instructions” including coloring are placed in visible location; maximum allowable
pressure markings following X MPa.
f) Subclause 19.11.4 was modified.
g) Subclause 21.1 was modified.
h) Subclause 21.2 was modified.
i) Subclause 22.102 was modified.
j) Subclause 22.104.1.1 was modified.
k) Subclause 22.104.5 was modified.
l) Subclause 22.104.10 was modified.
m) Subclause 22.104.11 was modified.
n) Subclause 22.105.1 was modified.
o) Subclause 22.107 was modified.
p) Subclause 30.2 was moved to Clause 29.
q) Annex AA was deleted and replaced with Annex AA.
r) Annex BB was deleted and replaced with former IEC 60335-2-104 Annex CC (normative)
Compatibility requirements following addition to Annex BB.
s) Annex DD was deleted and replaced with Annex CC.
t) New Annex DD was added.
u) New Annex EE was added.
The text of this International Standard is based on the following documents:
Draft Report on voting
61D/472/FDIS 61D/474/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 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 fifth edition of IEC 60335-1:2010 and its
amendments.
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 electrical appliances to recover
and/or recycle refrigerant from air conditioning and refrigeration equipment.
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.

– 6 – IEC 60335-2-104:2021 © IEC 2021
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 smaller 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 "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 or later than 36 months from the date of publication.
The following differences exist in the countries indicated below:
• 6.1: Class 01 appliances are allowed (Japan).
• 11.8: The temperature of the wooden walls in the test casing is limited to 85 °C (Sweden).

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.
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 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 60335-2-104:2021 © IEC 2021
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-104: Particular requirements for appliances to recover and/or
recycle refrigerant from air conditioning and refrigeration equipment

1 Scope
This clause of Part 1 is replaced by the following:
This part of IEC 60335 deals with the safety of electrical recovery and/or recycle equipment
to recover and/or recycle refrigerant from air conditioning and refrigeration equipment. This
applies to air-conditioning, heat-pumps and refrigeration equipment incorporating open drive or
motor-compressors, their maximum rated voltages being not more than 300 V for single phase
appliances and 600 V for all other equipment.
Appliances not intended for normal household use but which nevertheless may be a source of
danger to the public, such as appliances intended to be used by service personnel in shops, in
light industry and on farms, are within the scope of this standard.
The appliances referenced above may consist of one or more factory made assemblies. If
provided in more than one assembly, the separate assemblies are to be used together, and the
requirements are based on the use of matched assemblies.
NOTE 101 In this document, the term appliance is to denote recovery equipment.
2 Normative references
This clause of Part 1 is applicable except as follows.
Replacement:
IEC 60065:2014, Audio, video and similar electronic apparatus − Safety requirements
Addition:
IEC 60079-14, Explosive atmospheres – Part 14: Electrical installations design, selection and
erection
IEC 60079-15:2010 , Explosive atmospheres – Part 15: Equipment protection by type of
protection "n"
IEC 600320 (all parts), Appliance couplers for household and similar general purposes
IEC 60335-2-34:2012, Household and similar electrical appliances – Safety – Part 2-34:
Particular requirements for motor-compressors
____________
Withdrawn.
IEC 60335-2-40:2018, Household and similar electrical appliances – Safety – Part 2-40:
Particular requirements for electrical heat pumps, air-conditioners and dehumidifiers
IEC 62640:2011, Residual current devices with or without overcurrent protection for socket-
outlets for household and similar uses
IEC 62640:2011/AMD1:2015
ISO 5149-2, Refrigerating systems and heat pumps – Safety and environmental requirements
– Part 2: Design, construction, testing, marking and documentation
ISO 817:2014, Refrigerants – Designation and safety classification
ISO 817:2014/AMD1:2017
ASTM D4728-17, Standard Test Method for Random Vibration Testing of Shipping Containers
SAE J2210 HFC-134a (R-134a), Recovery/Recycling Equipment for Mobile Air-Conditioning
Systems
SAE J2843 R-1234yf [HFO-1234yf], Recovery/Recycling/Recharging Equipment for Flammable
Refrigerants for Mobile Air-Conditioning Systems
SAE J3030, Automotive Refrigerant Recovery/Recycling/Recharging Equipment Intended for
use with Both R-1234yf and R-134a
3 Terms and definitions
This clause of part 1 is applicable except as follows.
3.1.6
rated current
Note 101 to entry: If the appliance comprises electrical accessories, including fans, the rated current is based
upon the total maximum electrical power input with all accessories energized, when operating continuously under
the appropriate environmental conditions.
Replacement:
3.1.9
normal operation
conditions that apply when the appliance is mounted as in normal use and is operating under
the most severe operating conditions specified by the manufacturer
3.101
compressor
open drive compressor or motor-compressor (hermetically sealed) with the suction side (low
pressure side) which is intended to be temporarily connected to the appliance’s low pressure
side to remove refrigerant
3.102
pressure-limiting device
mechanism that automatically responds to a predetermined pressure by stopping the operation
of the pressure-imposing element
3.104
recovery
pumping out (removal) of refrigerant from air conditioning or refrigeration equipment

– 10 – IEC 60335-2-104:2021 © IEC 2021
3.105
recycle
pumping out (removal) and cleaning of refrigerant from air conditioning or refrigeration
equipment
3.106
refrigerant
substance that is classified by ISO 817 as A1, A2L, A2, A3 or B1
3.107
flammable refrigerant
substance that is classified by ISO 817 as A2L, A2, or A3
3.108
recovery cylinder
receptacle used for recovered refrigerant
3.109
scale
weighing device which is capable of measuring recovered refrigerant
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.
Replacement:
5.7 The tests and test conditions of Clause 10 and Clause 11 are carried out under conditions
as in 11.4 or under the most severe operating conditions within the operating temperature range
specified by the manufacturer.
6 Classification
This clause of Part 1 is applicable except as follows.
Modification:
6.1 Appliances shall be of one of the following classes with respect to protection against
electric shock:
class I, class II or class III.
Compliance is checked by inspection and by the relevant tests.

6.2 Addition:
Appliances shall be classified according to degree of protection against harmful ingress of water
in accordance with IEC 60529:
– appliances or parts of appliances intended for outdoor use shall be at least IPX4;
– appliances intended only for indoor use may be IPX0.
7 Marking and instructions
This clause of Part 1 is applicable except as follows.
7.1 Modification:
Replace the second dash by:
– symbol for nature of supply including number of phases, unless for single phase operation;
Replace the third dash by:
– rated current in amperes;
Addition:
– rated frequency;
– IP rating;
– maximum high and low side pressure;
– each applicable refrigerant for which the appliance is rated;
– for each refrigerant, one of the following:
• the chemical name;
• the refrigerant number (R designation) per ISO 817;
– the recovery cylinder shall meet the pressure of the refrigerant being recovered. Maximum
allowable pressure for the refrigerant circuit; if the permissible excessive operating
pressure for the suction and discharge side differ, a separate indication is required;
– appliances (recovery equipment) intended for use in service garages or other
environments where flammable gases may be present shall be marked: "This appliance
should be used in locations with mechanical ventilation that provides at least four air
changes per hour;
– recovery equipment intended for use in service garages that are covered by SAE J
standards covering recovery equipment for flammable equipment shall be exempt from this
marking and fall under the appropriate SAE or VDA standard.
For flammable refrigerants, any tubing or other devices through which the refrigerant is
intended to be serviced shall be painted or colored red. This color shall be present at all places
where service puncturing, or otherwise creating an opening in the refrigerant circuit might be
expected. In the case of a process tube on a compressor, the color mark shall extend at least
25 mm from the compressor.
– 12 – IEC 60335-2-104:2021 © IEC 2021
7.6 Addition:
Markings shall include the symbols for "read operator’s manual", "operator’s manual; operating
instructions" (symbol ISO 7000-0790 (2004-01)) including colour, and be placed on the
recovery equipment in a location visible to the persons required to know the information. The
perpendicular height of the symbol shall be at least 10 mm.
The maximum allowable pressures shall be marked with symbol ISO 7000-1701 (2004-01)
followed by the text "(X) MPa".
If the recovery equipment is certified for use with flammable refrigerant, the flammable
refrigerant symbol shall be used per ISO 7010-W021 (2011-05) and the perpendicular height
of the triangle shall be at least 30 mm.
[symbol ISO 7000-1641 operator's manual; operating
(2004-01)] instructions
[symbol ISO 7000-1701
pressure
(2004-01)]
(X) MPa
[symbol ISO 7010-W021
warning; flammable material
(2011-05)]
7.15 Addition:
A marking may be located on a panel that can be removed for installation or service, providing
that the panel shall be in place for the normal operation of the appliance.
7.101 A marking shall be provided for a replaceable fuse or a replaceable overload protective
device provided as a part of a product. It shall be visible when the cover or door of the
compartment is open. This marking shall specify
– the rating of the fuse in amperes, the type and voltage rating, or
– the manufacturer and model designation of the replaceable overload protective device.
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 not applicable.
10 Power input and current
This clause of Part 1 is applicable.
11 Heating
This clause of Part 1 is replaced by the following.
11.1 Appliances and their surroundings shall not attain excessive temperatures in normal use.
Compliance is checked by determining the temperatures of the various parts under the
conditions specified in 11.2 to 11.7. Nevertheless, if the temperature of the motor winding
exceeds the value specified in Table 1 or if there is a doubt with regard to the classification of
the insulation system employed in a motor, compliance is checked by the tests of Annex C.
11.2 The appliance is installed in a test room in accordance with the manufacturer’s
installation instructions. In particular
– clearances to adjacent surfaces specified by the manufacturer shall be maintained;
– adjustable limit controls are set at the maximum cut-out setting and the minimum differential
permitted by the control adjusting means.
11.3 Temperatures are determined by means of fine-wire thermocouples so chosen and
positioned that they have the minimum effect on the temperature of the part under test.
NOTE 101 Thermocouples having wires with a diameter not exceeding 0,3 mm are considered to be fine-wire
thermocouples.
The temperature of motor windings or of coils may be measured by the change-in-resistance
method.
Thermocouples used for determining the temperatures of the surface of walls, ceiling and floor
are embedded in the surface or attached to the back of small blackened disks of copper or
brass, 15 mm in diameter and 1 mm thick, which are flush with the surface.
So far as is possible, the appliance is positioned so that parts likely to attain the highest
temperatures touch the disks.
In determining the temperatures of handles, knobs, grips and the like, consideration is given to
all parts which are gripped in normal use and, if of insulating material, to parts in contact with
hot metal.
The temperature of electrical insulation, other than that of windings, is determined on the
surface of the insulation, at places where failure could cause a short circuit, contact between
live parts and accessible metal parts, bridging of insulation or reduction of creepage distances
or clearances below the values specified in 29.1.
11.4 Appliance is operated at normal operating voltage in a test room maintained at 43 °C or
at the maximum temperature specified by the manufacturer if higher, until temperatures reach
stabilisation.
– 14 – IEC 60335-2-104:2021 © IEC 2021
11.5 Appliances of the water-cooled type shall be operated with the water flow maintained at
the most severe condition as specified by the manufacturer.
11.6 All appliances are operated continuously until steady state conditions are obtained. All
appliances shall be operated according to the conditions in Annex AA.
11.7 During the test, the temperatures and pressures are monitored continuously and shall
not exceed the values shown in Table 1. Protective devices shall not operate and sealing
compound shall not flow out. Pressures are recorded and used in Clause 21.
Table 1 – Temperature limits
Part Temperature
°C
a
Windings of sealed motor-compressors
– with synthetic insulation
– with other insulation
External enclosures of sealed motor-compressors or of any other motor
b
Windings if the winding insulation is (other than motor-compressors):
c
– of class A material 100 (90)
c
– of class E material 115 (105)
c
– of class B material 120 (110)
c
– of class F material  140
c
– of class H material  165
– of class 200
– of class 220
– of class 250
Terminals, including earthing terminals, for external conductors of stationary appliances,
unless they are provided with a supply cord
d
Ambient of switches, and thermostats and temperature limiters
– without T marking
– with T marking
T
Rubber or polyvinyl chloride insulation of internal and external wiring, including supply

cords:
e
– without temperature rating 75
– with temperature rating (T)
T
Cord sheaths used as supplementary insulation
Rubber, other than synthetic, used for gaskets or other parts, the deterioration of which could

affect safety:
– when used as a supplementary insulation or reinforced insulation
– in other cases
Lampholders B22, E26 and E27:
– metal or ceramic type
– insulated type, other than ceramic
– with T-marking
T
Lampholders E14 and B15:
– metal or ceramic type 155
– insulated type, other than ceramic
– with T-marking
T
Part Temperature
°C
Material used as insulation other than that specified for wires and windings:

– impregnated or varnished textile, paper or press board
– laminated bonded with:
• melamine-formaldehyde, phenol-formaldehyde or phenol-furfural resins
• urea-formaldehyde resin
– printed circuit boards bonded with epoxy resin
– moulding of:
• phenol-formaldehyde with cellulose fillers
• phenol-formaldehyde with mineral fillers
• melamine-formaldehyde
• urea-formaldehyde
– polyester with glass-fibre reinforcement
– silicone rubber
– polytetrafluoroethylene
– pure mica and tightly sintered ceramic material, when such materials are used as

supplementary insulation or reinforced insulation
f
– thermoplastic material -
g
Wood, in general 90
Wooden walls of the test casing
h
Outer surface of capacitors
i
T
– with marking of maximum operating temperature (T)
– without marking of maximum operating temperature:

• small ceramic capacitors for radio and television interference suppression
• capacitors complying with IEC 60384-14 or 14.2 of IEC 60065:2014
• other capacitors
External enclosure of appliances without supplementary heater
Handles, knobs, grips and the like and all parts which are gripped in normal use:

– of metal
– of porcelain or vitreous material
– of moulded material, rubber or wood
Parts in contact with oil having a flash-point of t °C
t-25
Any point where the insulation of wires can come into contact with parts of a terminal block

or compartment for fixed wiring of a stationary appliance not provided with a supply cord:
– if the instructions require the use of supply wires with a temperature rating (T)
T
e
– in other cases 75
– 16 – IEC 60335-2-104:2021 © IEC 2021
a
Not required for motor-compressors that comply with IEC 60335-2-34.
b
The temperatures within parentheses apply when thermocouples are used. The figures without parentheses
apply when the resistance method is used.
c
The classification is in accordance with IEC 60085.
Examples of class A material are:
– impregnated cotton, silk, artificial silk and paper,
– enamels based on oleo or polyamide resins.
Examples of class B materials are:
– glass fibre, melamine-formaldehyde and phenol-formaldehyde resins.
Examples of class E materials are:
– mouldings with cellulose fillers, cotton fabric laminates and paper laminates, materials bonded with melamine-
formaldehyde, phenol-formaldehyde or phenol-furfural resins;
– cross-linked polyester resins, cellulose triacetate films, polyethylene terephthalate films;
– varnished polyethylene terephthalate textile bonded with oil-modified alkyd resin varnish;
– enamels based on polyvinyl formalin, polyurethane or epoxy resins.
For totally enclosed motors, the temperature limits for Class A, Class E and Class B materials may be
increased by 5 °C (5 K).
A totally enclosed motor is a motor so constructed that the circulation of the air between the inside and the
outside of the case is prevented, but which is not necessarily sufficiently enclosed to be called airtight.
d
T means the maximum operating temperature. The ambient temperature of switches and thermostats is the
temperature of the air at the hottest point at a distance of 5 mm from the surface of the switch and thermostat
concerned. For the purpose of this test, switches and thermostats marked with the individual ratings may be
considered as having no marking for the maximum operating temperature, if this is requested by the
manufacturer of the appliance.
e
This limit applies to cables, cords and wires complying with the relevant IEC standards; for others, it may be
different.
f
There is no specific limit for thermoplastic material, which shall withstand the tests of 30.1 or 30.2 of Part 1, for
which purpose the temperature shall be measured.
g
The limit specified concerns the deterioration of wood and it does not take into account the deterioration of
surface finishes.
h
There is no limit for the temperature rise of capacitors which are short-circuited in 19.7.
i
Temperature marking for capacitors mounted on printed circuit boards may be given in the technical sheet.
If these or other materials are used, they shall not be subjected to temperatures in excess of the thermal
capabilities as determined by aging tests made on the materials themselves.

NOTE 101 The value of the temperature of a winding is calculated from the formula:
R
T = (k+ T )− k
R
where
T is the temperature of the copper winding at the end of the test;
R is the resistance at the beginning of the test;
R is the resistance at the end of the test;
T is the ambient temperature at the beginning of the test;
k is equal to 234,5 for copper windings and 225 for aluminium windings.
At the beginning of the test, the windings are at ambient temperature.
the resistance of windings at the end of the test is determined by taking resistance measurements as soon as possible
after switching off, and then at short intervals so that a curve of resistance against time can be plotted for
ascerTaining the resistance at the instant of switching off.

12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is applicable except as follows.
13.2 Modification:
For permanently connected stationary class I recovery equipment, the leakage current shall
not exceed 2 mA per kilowatt at rated power input with a maximum value of 10 mA for
appliances accessible to the general public, and a maximum value of 30 mA for appliances not
accessible to the general public.
14 Transient overvoltages
This clause of Part 1 is applicable.
15 Moisture resistance
This clause of Part 1 is replaced by the following.
15.1 Electrical components of appliances shall be protected against the ingress of water which
may be present in the appliance.
Compliance is checked by the tests of 15.2, followed immediately by the spillage test of 15.3,
and this is followed by the tests of 11.6 and the tests of Clause 16.
Following these tests, an inspection is made within the enclosures. The water which may have
entered the enclosure shall not have reduced the creepage distances and clearances below the
minimum values specified in Clause 29.
NOTE 101 Appliances designed to be installed completely inside a building and which have no outdoor parts are
not subjected to the test of 15.2.
The motor-compressor is not operated during the tests of 15.2 and 15.3.
15.2 Appliances other than IPXO are subjected to the tests of IEC 60529:1989 as follows:
– IPX1 appliances as described in 14.2.1;
– IPX2 appliances as described in 14.2.2;
– IPX3 appliances as described in 14.2.3;
– IPX4 appliances as described in 14.2.4;
– IPX5 appliances as described in 14.2.5;
– IPX6 appliances as described in 14.2.6;
– IPX7 appliances as described in 14.2.7.
For this test, the appliance is immersed in water containing 1 % NaCI by weight.

– 18 – IEC 60335-2-104:2021 © IEC 2021
15.3 The appliance is installed according to the manufacturer's installation instructions, but
not operated. Covers which provide access for manual operation of electrical controls are set
in the open position, unless such covers are of the self-closing type. A solution of 0,25 l of water
containing 2,5 g of ordinary table salt is poured onto the unit in a manner most likely to cause
entrance of the water into or on electrical controls or uninsulated live parts. After the spillage
is completed, the appliance shall withstand the tests of Clause 16. The spillage test is not
applicable to units if the minimum dimension of a horizontal or near horizontal top surface of
the cabinet is 75 mm or less.
16 Leakage current and electric strength
This clause of Part 1 is applicable except as follows.
16.2 Modification:
For permanently connected stationary class I appliances, the leakage current shall not exceed
2 mA per kilowatt of rated power input, with a maximum value of 10 mA for appliances
accessible to the general public and a maximum value of 30
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