IEC 60335-2-34:2002

IEC 60335-2-34
Edition 4.2 2009-01
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-34: Particular requirements for motor-compressors

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IEC 60335-2-34
Edition 4.2 2009-01
INTERNATIONAL
STANDARD
Household and similar electrical appliances – Safety –
Part 2-34: Particular requirements for motor-compressors

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
CM
ICS 97.040.30 ISBN 978-2-88910-153-5
– 2 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
CONTENTS
FOREWORD.4
INTRODUCTION.6

1 Scope.8
2 Normative references.9
3 Definitions.9
4 General requirement .10
5 General conditions for the tests.10
6 Classification.12
7 Marking and instructions .13
8 Protection against access to live parts .13
9 Starting of motor-operated appliances.13
10 Power input and current .13
11 Heating.13
12 Void .13
13 Leakage current and electric strength at operating temperature.13
14 Transient overvoltages.13
15 Moisture resistance.14
16 Leakage current and electric strength .14
17 Overload protection of transformers and associated circuits .14
18 Endurance.14
19 Abnormal operation.14
20 Stability and mechanical hazards .18
21 Mechanical strength.18
22 Construction.19
23 Internal wiring.21
24 Components.21
25 Supply connection and external flexible cords .21
26 Terminals for external conductors .22
27 Provision for earthing.22
28 Screws and connections .22
29 Clearances, creepage distances and solid insulation .22
30 Resistance to heat and fire .23
31 Resistance to rusting .23
32 Radiation, toxicity and similar hazards.23

Annexes.25
Annex C (normative) Aging test on motors .25
Annex D (normative) Alternative requirements for protected motor units .25
Annex AA (normative) Running overload tests for motor-compressors classified
as tested with Annex AA.25

60335-2-34 © IEC:2002+A1:2004 – 3 –
+A2:2008(E)
Bibliography .29

Figure 101 – Supply circuit for the locked-rotor test of a single-phase motor-compressor .24
Figure AA.1 – Substitute refrigeration circuit.28

Table 101 – Minimum high side test pressures .19
Table 102 – Minimum low side test pressures.20
Table AA.1 – Substitute refrigeration circuit conditions for operating under running
overload conditions .26

– 4 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-34: Particular requirements for motor-compressors

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.
This part of International Standard IEC 60335 has been prepared by subcommittee 61C:
Household appliances for refrigeration, of IEC technical committee 61: Safety of household and
similar electrical appliances.
This consolidated version of IEC 60335-2-34 consists of the fourth edition (2002) [documents
61C/214/FDIS and 61C/217/RVD], its amendment 1 (2004) [documents 61C/283A/FDIS and
61C/298/RVD] and its amendment 2 (2008) [documents 61C/431/FDIS and 61C/435/RVD].
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.
It bears the edition number 4.2.
A vertical line in the margin shows where the base publication has been modified by
amendments 1 and 2.
60335-2-34 © IEC:2002+A1:2004 – 5 –
+A2:2008(E)
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 fourth edition (2001) 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 electrical motor-
compressors.
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 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 following differences exist in the countries indicated below.
– 7.1: The locked-rotor current marking is required for some motor-compressors (USA).
– 22.7: Different test pressures are used (Japan, USA).
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until the maintenance result date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date,
the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
2 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 the amendment 2 be adopted for implementation
nationally not earlier than 12 months or later than 36 months from the date of publication.

A bilingual version of this publication may be issued at a later date.

– 6 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
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
2 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.
For motor-compressors, testing in accordance with this standard is an option and cannot be
required as a precondition for testing the complete appliance, for example by reference in
Clause 24 of a part 2 of IEC 60335. However, testing of the appliance should be reduced if an
incorporated motor-compressor including its protection system or control system, if any,
complies with this standard.
If testing of the motor-compressor includes testing in accordance with Annex AA,
temperatures of the motor-compressor windings, housing and other parts related to the
motor-compressor, such as terminals, internal wiring and insulating materials, are not
measured when the complete appliance in which the motor-compressor is used is tested.
These requirements apply to sealed (hermetic and semi-hermetic type) motor-compressors
with their associated starting, cooling capacity control and protection systems, tested
separately under the most severe conditions of the refrigerating system operation which, within
reasonable limits, could occur in the applications for which they are used.

60335-2-34 © IEC:2002+A1:2004 – 7 –
+A2:2008(E)
In particular, the construction detail inspection and locked-rotor testing may be done separately
on the motor-compressor, thereby eliminating the need for inspection and testing when the
motor-compressor is applied to many different appliances and factory-built assemblies.
Operational tests may also be conducted on the motor-compressor separately in certain
circumstances. The specification for this type testing is provided in Annex AA. However, the
tests of the existing standards relevant to the given kind of application, such as IEC 60335-2-
24 and IEC 60335-2-40, may need to be conducted on the final application and used as the
final determination of acceptability.

– 8 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-34: Particular requirements for motor-compressors

1 Scope
This clause of Part 1 is replaced by the following.
This International Standard deals with the safety of sealed (hermetic and semi-hermetic type)
motor-compressors, their protection and control systems, if any, which are intended for use in
equipment for household and similar purposes and which conform with the standards
applicable to such equipment. It applies to motor-compressors tested separately, under the
most severe conditions that may be expected to occur in normal use, their rated voltage being
not more than 250 V for single-phase motor-compressors and 480 V for other motor-
compressors.
NOTE 101 Examples of equipment which contain motor-compressors are
– refrigerators, food freezers and ice makers (IEC 60335-2-24);
– air-conditioners, electric heat pumps and dehumidifiers (IEC 60335-2-40);
– commercial dispensing appliances and vending machines (IEC 60335-2-75);
– factory-built assemblies for transferring heat in applications for refrigerating, air-conditioning or heating
purposes or a combination of such purposes.
NOTE 102 This standard does not supersede the requirements of standards relevant to the particular appliance in
which the motor-compressor is used. However, if the motor-compressor type used complies with this standard,
the tests for the motor-compressor specified in the particular appliance standard may not need to be made in the
particular appliance or assembly. If the motor-compressor control system is associated with the particular
appliance control system, additional tests may be necessary on the final appliance.
So far as is practical, this standard deals with the common hazards presented by motor-
compressors used in appliances which are encountered by all persons in and around the
home. However, it does not in general take into account
– the use of appliances by young children or infirm persons without supervision;
– playing with the appliances by young children.
NOTE 103 Attention is drawn to the fact that
– for motor-compressors intended to be used in appliances in vehicles or on board ships, additional require-
ments may be necessary;
– in many countries, additional requirements are specified by the national health authorities, the national
authorities responsible for the protection of labour and similar authorities.
NOTE 104 This standard does not apply to
– motor-compressors designed exclusively for industrial purposes;
– motor-compressors used in 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).
NOTE 105 If motor-compressors for refrigerant R744 used in appliances with a transcritical refrigeration
system are equipped with pressure relief devices, compliance with the requirements for these devices is checked
during the tests on the final appliance.

60335-2-34 © IEC:2002+A1:2004 – 9 –
+A2:2008(E)
2 Normative references
This clause of Part 1 is applicable except as follows.
Modification:
Replace IEC 60252, AC Motor capacitors by IEC 60252-1, AC motor capacitors – Part 1:
General – Performance, testing and rating – Safety requirements – Guide for installation and
operation
3 Definitions
This clause of Part 1 is applicable, except as follows.
3.101
motor-compressor
appliance consisting of the mechanical mechanism of the compressor and the motor, both of
which are enclosed in the same sealed housing, with no external shaft seals, and with the
motor operating in a refrigerant atmosphere with or without oil. The housing may be
permanently sealed, such as by welding or brazing (hermetic motor-compressor), or may be
sealed by gasketted joints (semi-hermetic motor-compressor). A terminal box, a terminal box
cover, and other electrical components or an electronic control system may be included.
Hereafter, the term motor-compressor will be used to designate either a hermetic motor-
compressor or semi-hermetic motor-compressor
3.102
housing
sealed enclosure for the motor-compressor, which contains the compressor mechanism and
the motor, and which is subjected to refrigerant pressures
3.103
thermal motor-protector
automatic control, built-in or fitted on a motor-compressor, that is specifically intended to
protect the motor-compressor against over-heating due to running overload and failure to
start. This control carries motor-compressor current and is sensitive to one or both of the
following:
– motor-compressor temperature;
– motor-compressor current
NOTE The control is capable of being reset (either manually or automatically) when its temperature falls to the
reset value.
3.104
motor-compressor protection system
thermal motor protector and associated components, if any, or protective electronic circuit
fully or partly separate or integrated into the motor-compressor control system and which is
specifically intended to protect the motor-compressor against over-heating due to running
overload or failure to start. The control carries motor-compressor current and is sensitive to
one or both of the following:
– motor-compressor temperature;
– motor-compressor current
– 10 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
3.105
motor-compressor control system
system comprising one or more electrical or electronic components, or electronic circuits
that provides at least one of the following:
– motor-compressor starting control functions;
– motor-compressor cooling capacity control functions
3.106
starting relay
electrically operated control device intended for integration or incorporation into a motor-
compressor and used within the motor-compressor circuit to control the starting of single-
phase motor-compressors
3.107
application category
back pressure relative to the evaporation temperature range over which the motor-
compressor operates
For the purpose of this standard, the following classifications of application categories are
made relative to the evaporation temperature range:
– low back pressure (LBP): denotes an evaporation temperature range from equal to or less
than –35 °C to –15 °C;
– medium back pressure (MBP): denotes an evaporation temperature range from –20 °C
to 0 °C;
– high back pressure (HBP): denotes an evaporation temperature range from –5 °C to
equal to or greater than +15 °C.
2 3.108
transcritical refrigeration system
refrigeration system where the pressure in the high pressure side is above the pressure where

the vapour and liquid states of the refrigerant can coexist in thermodynamic equilibrium
3.109
design pressure (DP)
gauge pressure that has been assigned to a transcritical refrigeration system
It is specified for the high pressure side of a refrigeration system.
3 110
pressure relief device
pressure sensing device, intended to reduce pressure automatically when pressures within the
refrigeration system exceed the preset pressure of the device
NOTE This device has no provisions for setting by the end user.
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.

60335-2-34 © IEC:2002+A1:2004 – 11 –
+A2:2008(E)
5.2 Addition:
At least one additional sample is required for the tests of clause 19, however further samples
may also be provided or are needed.
For the test of 22.7, two samples of the housing are required.
5.7 Replacement:
Tests are carried out in an ambient temperature of 20 ºC ± 5 ºC.
5.8.2 Addition:
Motor-compressors with self-resetting motor-compressor protection systems, and
designed for more than one rated voltage, are subjected to the tests of 19.101 and 19.103 at
the highest voltage.
5.10 Addition:
For the tests of clause 19, the additional sample or samples shall be identical in all respects to
the test sample, charged with oil, if necessary, and vapour refrigerant. The sample has to be
provided with the motor-compressor protection system, starting relay, start capacitor, run
capacitor and control system, if any, as specified by the manufacturer, except that the rotor
shall have been locked by the manufacturer.
The manufacturer or responsible agent shall provide the following information for each type of
motor-compressor submitted for the tests:
– type (synthetic or cellulosic) of winding insulation;
– refrigerant identification:
a) for a single component refrigerant, by at least one of the following:
• chemical name;
• chemical formula;
• refrigerant number;
b) for a blended refrigerant, at least one of the following:
• chemical name and nominal proportion of each of the components;
• chemical formula and nominal proportion of each of the components;
• refrigerant number and nominal proportion of each of the components;
• refrigerant number of the refrigerant blend;
– types and quantity of oil to be used if the test samples which use oil are not already
charged;
– application category or application categories for motor-compressors classified as
being tested with Annex AA;
– whether a supply cord can be connected directly to terminals on the motor-compressor.
– for motor-compressors intended for appliances with a transcritical refrigeration system,
the test pressure for the high pressure side if higher than the minimum test pressure.

– 12 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
5.11 Replacement:
For motor-compressors which can be used in appliances where the supply cord is
connected directly to terminals on the motor-compressor, the test sample shall be provided
with a supply cord.
NOTE 101 Any additional samples required for testing need not be provided with a supply cord.
5.101 Motor-compressors, including those with crank-case heaters, are tested as motor-
operated appliances.
6 Classification
This clause of Part 1 is applicable, except as follows.
6.101 Motor-compressors are classified as being tested with Annex AA or without
Annex AA.
Motor-compressors can be classified as being tested with Annex AA only if the motor-
compressor in combination with the motor-compressor protection system or motor-
compressor control system, if any, can be configured to operate so as to deliver maximum
cooling capacity, independently of any input sensors that are only provided as part of the final
application.
NOTE Motor-compressors classified as being tested without Annex AA and their protection system or control
system, if any, are normally subjected to a heating test as a complete system in the final application in accordance
with the appropriate appliance standard.
Compliance is checked by
– the tests of this standard including the tests in Annex AA, for motor-compressors tested
with Annex AA;
– the tests of this standard but not including the tests in Annex AA, for motor-compressors
tested without Annex AA.
Motor-compressors using refrigerant R744 shall not be classified as being tested with
Annex AA.
6.102 Motor compressors are classified as being
– intended for direct connection of the appliance supply cord to the motor-compressor
terminals, or
– not intended for direct connection of the appliance supply cord to the motor-compressor
terminals.
NOTE 1 Motor-compressors can in both cases be delivered with or without the external components necessary
for connection of the supply cord.
NOTE 2 Motor-compressors intended for direct connection of the appliance supply cord to their terminals may
also be used without the supply cord being connected directly to their terminals.
NOTE 3 If the motor-compressor is used without the relevant components or with components different from
those specified by the manufacturer, additional testing in accordance with the appropriate appliance standard may
be necessary.
Compliance is checked by inspection and by the relevant tests.

60335-2-34 © IEC:2002+A1:2004 – 13 –
+A2:2008(E)
2 6.103 Motor-compressors are classified as being protected by protective electronic
circuits or not being protected by protective electronic circuits.
NOTE This does not preclude the protective electronic circuits being provided in the end product.
Compliance is checked by inspection and by the relevant tests.
7 Marking and instructions
This clause of Part 1 is applicable, except as follows.
7.1 Modification:
The rated power input or rated current need not be marked.
7.5 Not applicable.
7.7 Not applicable.
7.12 Not applicable, except 7.12.1 which is applicable.
7.13 Not applicable.
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 not applicable.
11 Heating
This clause of Part 1 is not applicable.
NOTE 101 For motor-compressors, this clause of Part 1 may be covered by Annex AA.
12 Void
13 Leakage current and electric strength at operating temperature
This clause of Part 1 is not applicable, except 13.3 as required by 19.104.
14 Transient overvoltages
This clause of Part 1 is applicable.

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+A2:2008(E)
15 Moisture resistance
This clause of Part 1 is applicable, except as follows.
15.3 Addition:
NOTE 101 Motor-compressors with glass-insulated terminals and without any external control devices, protectors
or other components need not be tested.
16 Leakage current and electric strength
This clause of Part 1 is applicable.
17 Overload protection of transformers and associated circuits
This clause of Part 1 is applicable.
18 Endurance
This clause of Part 1 is not applicable.
19 Abnormal operation
This clause of Part 1 is applicable, except as follows.
19.1 Modification:
Replace the test specification by the following:
Motor-compressors are submitted to the tests of 19.101, 19.102, 19.103 and, additionally, if
so required by the classification of 6.101, to the tests specified in Annex AA.
Motor-compressors incorporating electronic circuits are also subjected to the tests of 19.11
and 19.12.
Only one abnormal condition is simulated each time.
Compliance with the tests of 19.11 and 19.12 is checked as described in 19.13. Compliance
with the tests of 19.101, 19.102 and 19.103 is checked as described in 19.104. Compliance
with the tests of Annex AA is checked as described in Annex AA.
19.2 to 19.10 Not applicable.
19.11.2 Modification:
If the tests of this subclause have to be carried out, they shall be carried out in the end product
application.
NOTE 101 The application of these tests in this part 2 is not mandatory.
19.11.3 Replacement:
If the motor-compressor is classified as being protected by a protective electronic circuit
and if this protective electronic circuit operates to ensure compliance with Clause 19 and

60335-2-34 © IEC:2002+A1:2004 – 15 –
+A2:2008(E)
2 Annex AA, the tests of 19.101, 19.102, 19.103 and Annex AA are repeated with a single fault
simulated, as indicated in a) to g) of 19.11.2.
However, the test of Annex AA is not repeated if during the test of Annex AA, for motor-
compressors classified as being tested with Annex AA, the motor-compressor protection
system did not operate. The test of Annex AA is also not repeated on motor-compressors
that are classified as being tested without Annex AA.
19.11.4 Addition:
If the tests of this subclause have to be carried out, they must be carried out in the end product
application.
NOTE 101 The application of these tests in this part 2 is not mandatory.
19.101 The motor-compressor and motor-compressor protection system, together with all
their associated components which operate under locked-rotor conditions, are connected in the
circuit shown in Figure 101 and supplied with rated voltage as specified in 5.8.2.
NOTE 1 The associated components which comply with the requirements in clause 24 are not evaluated by this
test.
For motor-compressors with a non-self-resetting thermal motor-compressor protection
system, the motor-compressor is operated until a sufficient number of operations have been
made to ensure that continuous automatic recycling does not occur. The number of operations
should, however, not be less than three and should be performed as rapidly as possible with a
minimum delay of 6 s.
A longer off time is permitted if a delay feature longer than 6 s is part of the protection system
or control system.
All electromechnical components of the protection system shall be tested individually for 50
operations in total with the motor-compressor or with a load corresponding to the actual
motor-compressor or a higher load.
For motor-compressors with a self-resetting motor-compressor protection system the
motor-compressor protection system is allowed to cycle continuously for a period of 15 days
or for at least 2 000 cycles, whichever is the longer.
Motor-compressors without a motor-compressor protection system and only protected by
the impedance of the windings, are connected in the circuit shown in Figure 101 and supplied
with rated voltage. If a motor-compressor is designed for more than one rated voltage it is
tested at the highest voltage.
At the conclusion of the first 72 h of the locked-rotor test, the motor-compressor is subjected
to the electric strength test as specified in 16.3.
For motor-compressors with a self-resetting motor-compressor protection system, if
2 000 cycles of the protection system have not been performed by the end of the 15-day
period, the test may be terminated provided the following conditions are met:
– the housing temperature is recorded on the 12th and 15th days. If, during this three day
period, the temperature has not increased by more than 5 K, the test can be terminated. If
the temperature has increased by more than 5 K, the test is to be continued until the
temperature has not increased by more than 5 K over a period of three consecutive days or
for at least 2 000 cycles of the motor-compressor protection system, whichever occurs
first;
– the components in the circuit comply with the requirements of clause 24 using at least the
current and a power factor not exceeding that measured during the test of this clause.

– 16 – 60335-2-34 © IEC:2002+A1:2004
+A2:2008(E)
NOTE 2 If a given motor-compressor, self-resetting motor-compressor protection system combination is intended
for use with more than one refrigerant, only one 15 day test is required, the choice of the refrigerant being made by
the motor-compressor manufacturer.
NOTE 3 These test procedures may be modified, if necessary, to evaluate motor-compressor protection systems
which incorporate special or unique features.
Motor-compressors with a self-resetting motor-compressor protection system and
designed for more than one rated voltage are also tested at the lowest voltage for 3 h.
NOTE 4 A separate sample may be used for the test at the lowest voltage.
For motor-compressors where the design of the protection system or control system is
such that the windings are de-energized permanently, the motor-compressor and motor-
compressor protection system (if any), together with all their associated components which
operate under locked-rotor conditions, are re-energized. This procedure is repeated as rapidly
as possible until 10 operations have been performed, with a minimum off time of 6 s. A longer
off time is permitted if a delay feature longer than 6 s is part of the protection system or
control system.
If the motor-compressor is designed for more than one rated voltage the test is performed at
all rated voltages.
If the motor-compressor is designed for a voltage range the test is performed at the upper
and lower voltage limit.
Motor-compressors without a motor-compressor protection system are left energized as
th th
described above for 15 days. The housing temperature is recorded on the 12 and 15 days.
If, during these three days the temperature has not increased by more than 5 K the test can be
terminated.
19.102 The test of 19.101 is repeated for one operation of a non-self resetting motor-
compressor protection system or 3 h minimum for self-resetting motor-compressor
protection system under the following conditions:
– with start and run capacitors open-circuited one at a time;
– with start and run capacitors short-circuited one at a time, unless they have been
tested and shown to comply with the requirements for protection class P2 capacitors of
IEC 60252-1.
NOTE 1 The test with the capacitors open-circuited need not be conducted for motor-compressors where the
open-circuited capacitors remove the start winding from the circuits.
NOTE 2 For motor-compressors with a self-resetting motor-compressor protection system and which are
designed for more than one rated voltage, it is not necessary to repeat the test at the lowest voltage.
NOTE 3 This test may be performed on separate samples.
19.103 Three-phase motor-compressors and the motor-compressor protection systems,
together with all their associated components which operate under locked-rotor conditions, are
connected in the circuit shown in Figure 101 and supplied with rated voltage but with one
phase to the motor-compressor disconnected during the following periods:
– for motor-compressors with a self-resetting motor-compressor protection system, for
3 h;
– for motor-compressors with a non-self resetting motor-compressor protection system,
until the first operation of the motor-compressor protection system;
– for motor-compressors without a motor-compressor protection system for 3 h.
NOTE This test may be carried out on a separate sample.

60335-2-34 © IEC:2002+A1:2004 – 17 –
+A2:2008(E)
19.104 During the tests of 19.101, 19.102 and 19.103
– the motor-compressor protection system shall be able to operate;
– the temperature of the housing and the temperature of the accessible surfaces of
associated components shall not exceed 150 °C;
– the residual current device shown in Figure 101 shall not operate;
– the motor-compressor, its associated starting relay and motor-compressor protection
system shall not emit flames, sparks or molten metal.
2 At the conclusion of the tests of 19.101, 19.103 and the test of 19.102 that is carried out with
start and run capacitors open-circuited
– enclosures shall not have deformed to such an extent as to impair compliance with
clause 29;
– the motor-compressor protection system shall be able to operate;
– the motor-compressor shall withstand
• the leakage current test as specified in 16.2, the test voltage being applied between the
windings and the housing;
• the electric strength test of 13.3 of Part 1.
If the test of 19.102 is carried out with start and run capacitors short-circuited one at a time,
then at the conclusion of this test
– enclosures shall not have deformed to such an extent as to impair compliance with
Clause 29;
– the motor-compressor shall withstand
• the leakage current test as specified in 16.2, the test voltage being applied between the
windings and the housing;
• the electric strength test of 13.3 of Part 1;
– the motor-compressor protection system shall be able to operate or it shall remain
permanently open-circuited.
If the motor-compressor protection system remains permanently open-circuited, the test of
19.102 with start and run capacitors short-circuited shall be repeated on three additional
samples and all three additional samples shall remain permanently open-circuited at the
conclusion of the test.
NOTE The test may be repeated on three new motor-compressors or by replacing, in the motor-compressor
originally tested, the motor-compressor protection system with one of the same type.
19.105 Three-phase motor-compressors shall be adequately protected against primary
single-phase failure.
NOT
...