IEC 60335-2-89:2010

IEC 60335-2-89 ®
Edition 2.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-89: Particular requirements for commercial refrigerating appliances
with an incorporated or remote refrigerant unit or compressor

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-89: Règles particulières pour les appareils de réfrigération à usage
commercial avec une unité de fluide frigorigène ou un compresseur incorporés
ou à distance
All rights reserved. Unless otherwise specified, 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 either IEC or

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The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

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IEC 60335-2-89 ®
Edition 2.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-89: Particular requirements for commercial refrigerating appliances
with an incorporated or remote refrigerant unit or compressor

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-89: Règles particulières pour les appareils de réfrigération à usage
commercial avec une unité de fluide frigorigène ou un compresseur incorporés
ou à distance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
X
CODE PRIX
ICS 97.130.20 ISBN 2-8318-6292-2
SC 61C/IEC 60335-2-89 (2010), second edition/I-SH 01

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –

Part 2-89: Particular requirements for commercial refrigerating appliances

with an incorporated or remote refrigerant unit or compressor

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 61C: Safety of refrigeration
appliances for household and commercial use, of technical committee 61: Safety of household
and similar electrical appliances
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
61C/562/ISH 61C/571/RVISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
SC 61C interpretation sheet on: Pressure relief devices used in transcritical
refrigeration systems
Introduction
Requirements for refrigeration systems that use transcritical refrigerants such as CO (R 744)
were introduced into the standard in 2010; however at the time few manufacturers saw
transcritical refrigerants as a future progression. It is only recently that commercial
refrigerating appliances using such systems are being developed and as a result some
clarification of the standard is required due to practicalities of technology being applied.
There is a requirement in 22.103 that appliances employing a transcritical refrigeration

system shall include a pressure relief device in the high pressure side of the refrigeration
system. The intent of this device is to prevent the pressure of the system exceeding the
design pressure should a malfunction occur, such as a failure of the gas cooler fan motor.
A pressure test is carried out on the system with the pressure relief device rendered
inoperative to ensure that the high side of the system and components can withstand at least
3 times the design pressure or as a minimum the high side pressure specified in
IEC 60335-2-34, which in the case of R 744 (CO ) is 420 bar (42 MPa).
The pressure relief device is defined in 3.111 as a “pressure sensing device intended to
reduce pressure automatically when pressures within the refrigeration system exceed the
setting pressure of the device”.
As per the text of 22.103 the operating pressure of the pressure relief device shall be no
higher than the design pressure of the high pressure side. The component test parameters
for several different types of pressure relief device such as mechanical, electrical and those
of the burst disc type are listed in the addition of 24.1.4.

Questions
On the basis that the pressure relief device can maintain the design pressure by either

venting refrigerant from the refrigeration system or by automatically shutting down the

pressure generating element (the compressor),

1) How to apply the second paragraph of 22.103 where the pressure is controlled by

automatically shutting down the pressure generating element (the compressor).

2) Subclause 24.101 specifies requirements to ensure that the discharge capacity of the

pressure relief device is adequate and which can be verified by calculation or by a

test. In the case of an electrical pressure relief device that automatically shuts down
the compressor instead of externally venting refrigerant is this clause relevant?
Relevant text from IEC 60335-2-89:
The second paragraph of 22.103 states in regard to the mounting of the pressure relief
device: “The pressure relief device shall be mounted so that the refrigerant released from
the system cannot cause any harm to the user of the appliance. The aperture shall be located
so that it is unlikely to be obstructed in normal use.”
Subclause 24.101 states:
24.101 The discharge capacity of the pressure relief device shall be such that it is able to
release an adequate amount of refrigerant so that the pressure during the release of the
refrigerant does not increase beyond the pressure setting of the pressure relief device, even
if the compressor is operating.
Compliance is checked by validation of the manufacturer’s calculations or by an appropriate
test.
ANSWERS
1) The second paragraph of 22.103 is not relevant where the pressure is controlled by
automatically shutting down the pressure generating element (the compressor) since
the pressure is not controlled by releasing refrigerant from the system.
2) Subclause 24.101 is not relevant to a pressure relief device that senses pressure and
shuts down the compressor automatically if the system high side pressure exceeds the
high side design pressure since such a device does not have a discharge capacity.

July 2014 ICS 97.130.20
– 2 – 60335-2-89 © IEC:2010
CONTENTS
FOREWORD.4

INTRODUCTION.7

1 Scope.8

2 Normative references .8

3 Definitions .9

4 General requirement.11

5 General conditions for the tests .11

6 Classification.12
7 Marking and instructions.12
8 Protection against access to live parts.15
9 Starting of motor-operated appliances .16
10 Power input and current .16
11 Heating .16
12 Void.18
13 Leakage current and electric strength at operating temperature.18
14 Transient overvoltages .18
15 Moisture resistance .18
16 Leakage current and electric strength.19
17 Overload protection of transformers and associated circuits .20
18 Endurance.20
19 Abnormal operation .20
20 Stability and mechanical hazards .22
21 Mechanical strength .22
22 Construction .22
23 Internal wiring.31
24 Components .31
25 Supply connection and external flexible cords .33
26 Terminals for external conductors.33
27 Provision for earthing .33

28 Screws and connections .33
29 Clearances, creepage distances and solid insulation.34
30 Resistance to heat and fire.
...

IEC 60335-2-89 ®
Edition 2.1 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –
Part 2-89: Particular requirements for commercial refrigerating appliances
with an incorporated or remote refrigerant unit or compressor

Appareils électrodomestiques et analogues – Sécurité –
Partie 2-89: Règles particulières pour les appareils de réfrigération à usage
commercial avec une unité de fluide frigorigène ou un compresseur incorporés
ou à distance
All rights reserved. Unless otherwise specified, 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
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,

please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et les

microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.

Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette

publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: csc@iec.ch.

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
La recherche avancée vous permet de trouver des Le premier dictionnaire en ligne au monde de termes
publications CEI en utilisant différents critères (numéro de électroniques et électriques. Il contient plus de 30 000
référence, texte, comité d’études,…). termes et définitions en anglais et en français, ainsi que
Elle donne aussi des informations sur les projets et les les termes équivalents dans les langues additionnelles.
publications remplacées ou retirées. Egalement appelé Vocabulaire Electrotechnique
International (VEI) en ligne.
Just Published CEI - webstore.iec.ch/justpublished
Service Clients - webstore.iec.ch/csc
Restez informé sur les nouvelles publications de la CEI.
Just Published détaille les nouvelles publications parues. Si vous désirez nous donner des commentaires sur
Disponible en ligne et aussi une fois par mois par email. cette publication ou si vous avez des questions
contactez-nous: csc@iec.ch.
IEC 60335-2-89 ®
Edition 2.1 2012-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Household and similar electrical appliances – Safety –

Part 2-89: Particular requirements for commercial refrigerating appliances

with an incorporated or remote refrigerant unit or compressor

Appareils électrodomestiques et analogues – Sécurité –

Partie 2-89: Règles particulières pour les appareils de réfrigération à usage

commercial avec une unité de fluide frigorigène ou un compresseur incorporés

ou à distance
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CN
ICS 97.130.20 ISBN 978-2-8322-0258-6

SC 61C/IEC 60335-2-89 (2010), second edition/I-SH 01

HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –

Part 2-89: Particular requirements for commercial refrigerating appliances

with an incorporated or remote refrigerant unit or compressor

INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 61C: Safety of refrigeration
appliances for household and commercial use, of technical committee 61: Safety of household
and similar electrical appliances
The text of this interpretation sheet is based on the following documents:
ISH Report on voting
61C/562/ISH 61C/571/RVISH
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
SC 61C interpretation sheet on: Pressure relief devices used in transcritical
refrigeration systems
Introduction
Requirements for refrigeration systems that use transcritical refrigerants such as CO (R 744)
were introduced into the standard in 2010; however at the time few manufacturers saw
transcritical refrigerants as a future progression. It is only recently that commercial
refrigerating appliances using such systems are being developed and as a result some
clarification of the standard is required due to practicalities of technology being applied.
There is a requirement in 22.103 that appliances employing a transcritical refrigeration

system shall include a pressure relief device in the high pressure side of the refrigeration
system. The intent of this device is to prevent the pressure of the system exceeding the
design pressure should a malfunction occur, such as a failure of the gas cooler fan motor.
A pressure test is carried out on the system with the pressure relief device rendered
inoperative to ensure that the high side of the system and components can withstand at least
3 times the design pressure or as a minimum the high side pressure specified in
IEC 60335-2-34, which in the case of R 744 (CO ) is 420 bar (42 MPa).
The pressure relief device is defined in 3.111 as a “pressure sensing device intended to
reduce pressure automatically when pressures within the refrigeration system exceed the
setting pressure of the device”.
As per the text of 22.103 the operating pressure of the pressure relief device shall be no
higher than the design pressure of the high pressure side. The component test parameters
for several different types of pressure relief device such as mechanical, electrical and those
of the burst disc type are listed in the addition of 24.1.4.

Questions
On the basis that the pressure relief device can maintain the design pressure by either

venting refrigerant from the refrigeration system or by automatically shutting down the

pressure generating element (the compressor),

1) How to apply the second paragraph of 22.103 where the pressure is controlled by

automatically shutting down the pressure generating element (the compressor).

2) Subclause 24.101 specifies requirements to ensure that the discharge capacity of the

pressure relief device is adequate and which can be verified by calculation or by a

test. In the case of an electrical pressure relief device that automatically shuts down
the compressor instead of externally venting refrigerant is this clause relevant?
Relevant text from IEC 60335-2-89:
The second paragraph of 22.103 states in regard to the mounting of the pressure relief
device: “The pressure relief device shall be mounted so that the refrigerant released from
the system cannot cause any harm to the user of the appliance. The aperture shall be located
so that it is unlikely to be obstructed in normal use.”
Subclause 24.101 states:
24.101 The discharge capacity of the pressure relief device shall be such that it is able to
release an adequate amount of refrigerant so that the pressure during the release of the
refrigerant does not increase beyond the pressure setting of the pressure relief device, even
if the compressor is operating.
Compliance is checked by validation of the manufacturer’s calculations or by an appropriate
test.
ANSWERS
1) The second paragraph of 22.103 is not relevant where the pressure is controlled by
automatically shutting down the pressure generating element (the compressor) since
the pressure is not controlled by releasing refrigerant from the system.
2) Subclause 24.101 is not relevant to a pressure relief device that senses pressure and
shuts down the compressor automatically if the system high side pressure exceeds the
high side design pressure since such a device does not have a discharge capacity.

July 2014 ICS 97.130.20
– 2 – 60335-2-89  IEC:2010+A1:2012

CONTENTS
FOREWORD . 4

INTRODUCTION . 7

1 Scope . 8

2 Normative references . 8

3 Terms and definitions. 9

4 General requirement . 11

5 General conditions for the tests . 11
6 Classification . 12
7 Marking and instructions . 12
8 Protection against access to live parts . 16
9 Starting of motor-operated appliances . 16
10 Power input and current . 16
11 Heating . 17
12 Void. 19
13 Leakage current and electric strength at operating temperature . 19
14 Transient overvoltages . 19
15 Moisture resistance . 19
16 Leakage current and electric strength . 20
17 Overload protection of transformers and associated circuits . 20
18 Endurance . 20
19 Abnormal operation . 20
20 Stability and mechanical hazards . 22
21 Mechanical strength . 22
22 Construction . 23
23 Internal wiring . 32
24 Components . 33
25 Supply connection and external flexible cords . 34
26 Terminals for external conductors . 34
27 Provision for earthing . 34
28 Screws and connections .
...