IEC 60335-2-51:2023
(Main)Household and similar electrical appliances - Safety - Part 2-51: Particular requirements for stationary circulation pumps for heating and service water installations
Household and similar electrical appliances - Safety - Part 2-51: Particular requirements for stationary circulation pumps for heating and service water installations
IEC 60335-2-51:2023 deals with the safety of electric stationary circulation pumps for house-hold and similar purposes intended for use in heating systems or in service water sys-tems, their rated voltage being not more than 250 V for single-phase appliances and 480 V for other appliances including direct current (DC) supplied appliances. The hydraulic and electrical parts of the pump can be in the same enclosure, so that the water flows through the motor and serves as a coolant, or they can be separated. Appliances not intended for normal household use, but that nevertheless can be a source of danger to the public, such as appliances intended to be used by laymen in shops, in light industry and on farms, are within the scope of this standard. As far as is practicable, this standard deals with the common hazards presented by ap-pliances that are encountered by all persons in and around the home. However, in gen-eral, it does not take into account:
- persons (including children) whose physical, sensory or mental capabilities; or lack of experience and knowledge prevents them from using the appliance safely without supervision or instruction;
- children playing with the appliance.
Attention is drawn to the fact that
- for appliances intended to be used in vehicles or on-board ships or aircraft, additional requirements can be necessary;
- in many countries additional requirements are specified by the national health authori-ties, the national authorities responsible for the protection of labour and similar au-thorities.
This standard does not apply to
- pumps for circulating liquids other than water;
- pumps, other than circulation pumps (IEC 60335-2-41);
- circulation pumps intended exclusively for industrial purposes;
- circulation pumps intended to be used in locations where special conditions prevail, such as the presence of a corrosive or explosive atmosphere (dust, vapour, or gas).
This fifth edition cancels and replaces the fourth edition published in 2019. This edition constitutes a technical revision. This edition includes the following significant technical changes with respect to the pre-vious edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1);
c) the use of separate connectors to ease the installation and establish the supply con-nection has been introduced (7.12.1, 22.102, 24.1.5, 24.1.101, 25.3);
d) clarifications related to remote operation (22.40, 22.49, 22.51).
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its amendments unless that edition precludes it; in that case, the latest edition that does not preclude it is used. It was established on the basis of the sixth edition (2020) of that standard.
Appareils électrodomestiques et analogues - Sécurité - Partie 2-51: Exigences particulières pour les pompes de circulation fixes pour installations de chauffage et de distribution d'eau
L'IEC 60335-2-51:2023 traite de la sécurité des pompes de circulation fixes électriques à usage domestique et analogue, destinées à être utilisées dans des installations de chauffage ou de distribution d'eau, dont la tension assignée est inférieure ou égale à 250 V pour les appareils monophasés et à 480 V pour les autres appareils, y compris les appareils alimentés en courant continu. Les parties hydrauliques et électriques de la pompe peuvent être situées dans la même enveloppe, de sorte que l'eau s'écoule à travers le moteur et serve de liquide de refroidissement, ou elles peuvent être séparées.
Les appareils non destinés à un usage domestique normal, mais qui peuvent néanmoins constituer une source de danger pour le public, tels que les appareils destinés à être utilisés par des usagers non avertis dans des magasins, chez des artisans et dans des fermes, sont compris dans le domaine d'application de la présente norme. Dans la mesure du possible, la présente norme traite des dangers courants que présentent les appareils et auxquels sont exposés tous les individus situés à l'intérieur et autour de l'habitation. Cependant, elle ne tient en général pas compte:
- des personnes (y compris des enfants) dont les capacités physiques, sensorielles ou mentales; ou le manque d'expérience et de connaissance les empêchent d'utiliser l'appareil en toute sécurité sans surveillance ou instruction;
- des enfants qui jouent avec l'appareil.
L'attention est attirée sur le fait que:
- pour les appareils destinés à être utilisés dans des véhicules ou à bord de navires ou d'avions, des exigences supplémentaires peuvent être nécessaires;
- dans de nombreux pays, des exigences supplémentaires sont spécifiées par les organismes nationaux de la santé, par les organismes nationaux responsables de la protection des travailleurs et par des organismes similaires.
La présente norme ne s'applique pas:
- aux pompes destinées à la circulation de liquides autres que l'eau;
- aux pompes autres que les pompes de circulation (IEC 60335-2-41);
- aux pompes de circulation destinées exclusivement à des usages industriels;
- aux pompes de circulation destinées à être utilisées dans des locaux qui présentent des conditions particulières, telles que la présence d'une atmosphère corrosive ou explosive (poussière, vapeur ou gaz).
Cette cinquième édition annule et remplace la quatrième édition parue en 2019. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) le texte a été aligné sur l'IEC 60335-1:2020;
b) certaines notes ont été converties en texte normatif (Article 1);
c) l'emploi de connecteurs distincts a été ajouté afin de faciliter l'installation et d'effectuer le raccordement au réseau (7.12.1, 22.102, 24.1.5, 24.1.101, 25.3);
d) l'emploi de la commande à distance a été clarifié (22.40, 22.49, 22.51).
La présente partie 2 doit être utilisée conjointement avec la dernière édition de l'IEC 60335-1 et ses amendements sauf si cette édition l'exclut. Dans ce cas, la dernière édition qui n'exclut pas la présente partie 2 est utilisée. Elle a été établie sur la base de la sixième édition (2020) de cette norme.
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IEC 60335-2-51 ®
Edition 5.0 2023-12
COMMENTED VERSION
INTERNATIONAL
STANDARD
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inside
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
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International Standards for all electrical, electronic and related technologies.
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IEC 60335-2-51 ®
Edition 5.0 2023-12
COMMENTED VERSION
INTERNATIONAL
STANDARD
colour
inside
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.080, 91.140.10 ISBN 978-2-8322-8047-8
– 2 – IEC 60335-2-51:2023 CMV © IEC 2023
CONTENTS
FOREWORD .3
INTRODUCTION .6
1 Scope .7
2 Normative references .8
3 Terms and definitions .8
4 General requirement .8
5 General conditions for the tests .8
6 Classification .8
7 Marking and instructions .9
8 Protection against access to live parts . 10
9 Starting of motor-operated appliances . 10
10 Power input and current . 10
11 Heating . 10
12 Void Charging of metal-ion batteries . 11
13 Leakage current and electric strength at operating temperature . 11
14 Transient overvoltages . 11
15 Moisture resistance . 11
16 Leakage current and electric strength . 11
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 11
20 Stability and mechanical hazards . 12
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 13
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
29 Clearances, creepage distances and solid insulation . 13
30 Resistance to heat and fire . 13
31 Resistance to rusting. 14
32 Radiation, toxicity and similar hazards . 14
Annexes . 15
Annex A (informative) Routine tests . 15
Bibliography . 16
List of comments . 17
Table 101 – Temperature classification of circulation pumps.9
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-51: Particular requirements for stationary circulation pumps for
heating and service water installations
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,
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ardization (ISO) in accordance with conditions determined by agreement between the two organizations.
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ested IEC National Committees.
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6) All users should ensure that they have the latest edition of this publication.
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members of its technical committees and IEC National Committees for any personal injury, property damage or
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9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a) pa-
tent(s). IEC takes no position concerning the evidence, validity or applicability of any claimed patent rights in
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the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
This commented version (CMV) of the official standard IEC 60335-2-51:2023 edition 5.0
allows the user to identify the changes made to the previous IEC 60335-2-51:2019
edition 4.0. Furthermore, comments from IEC TC 61 experts are provided to explain the
reasons of the most relevant changes, or to clarify any part of the content.
A vertical bar appears in the margin wherever a change has been made. Additions are in
green text, deletions are in strikethrough red text. Experts' comments are identified by a
blue-background number. Mouse over a number to display a pop-up note with the com-
ment.
This publication contains the CMV and the official standard. The full list of comments is
available at the end of the CMV.
– 4 – IEC 60335-2-51:2023 CMV © IEC 2023
IEC 60335-2-51 has been prepared by IEC technical committee 61: Safety of household and
similar electrical appliances. It is an International Standard.
This fifth edition cancels and replaces the fourth edition published in 2019. This edition consti-
tutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the text has been aligned with IEC 60335-1:2020;
b) some notes have been converted to normative text (Clause 1);
c) the use of separate connectors to ease the installation and establish the supply connection
has been introduced (7.12.1, 22.102, 24.1.5, 24.1.101, 25.3);
d) clarifications related to remote operation (22.40, 22.49, 22.51).
The text of this International Standard is based on the following documents:
Draft Report on voting
61/7008/FDIS 61/7073/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 de-
scribed in greater detail at www.iec.ch/publications.
A list of all parts of the IEC 60335 series, under the general title: Household and similar elec-
trical appliances – Safety, can be found on the IEC website.
This part 2 is to be used in conjunction with the latest edition of IEC 60335-1 and its amend-
ments unless that edition precludes it; in that case, the latest edition that does not preclude it
is used. It was established on the basis of the sixth edition (2020) of that standard.
NOTE 1 When "Part 1" is mentioned in this st
...
IEC 60335-2-51 ®
Edition 5.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-51:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
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.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60335-2-51 ®
Edition 5.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-51:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.080, 91.140.10 ISBN 978-2-8322-8048-5
IEC 60335-1:2020/ISH1:2021 – 1 –
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0 2020-09
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 1: General requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 61: Safety of
household and similar electrical appliances.
The text of this Interpretation Sheet is based on the following documents:
Draft Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
___________
INTRODUCTION
Edition 6 of IEC 60335-1:2020 defines and introduces requirements for a detachable
power supply part of an appliance. In the document, 24.2 prohibits the use of a power
supply in a flexible cord.
QUESTION:
Does Subclause 24.2 prohibit the use of a detachable power supply part?
ANSWER
No, a "detachable power supply part" is a defined term and is not captured by the term
"power supply" as used in Subclause 24.2.
NOTE A detachable power supply part is captured by the defined term when the output of the power supply
part is detachable from the class III construction part of the appliance at:
– the power supply part, or
– the class III construction part of the appliance.
However, the supply cord (if any) does not have to be detachable from the detachable power supply part.
ICS 13.120; 97.030
IEC 60335-1:2020-09/ISH1:2021-11(en)
– 2 – IEC 60335-2-51:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 15
4 General requirement . 27
5 General conditions for the tests . 27
6 Classification . 31
7 Marking and instructions . 32
8 Protection against access to live parts . 40
9 Starting of motor-operated appliances . 42
10 Power input and current . 42
11 Heating . 44
12 Charging of metal-ion batteries . 50
13 Leakage current and electric strength at operating temperature . 51
14 Transient overvoltages . 54
15 Moisture resistance . 55
16 Leakage current and electric strength . 58
17 Overload protection of transformers and associated circuits . 60
18 Endurance . 60
19 Abnormal operation . 60
20 Stability and mechanical hazards . 70
21 Mechanical strength . 72
22 Construction . 73
23 Internal wiring . 86
24 Components . 88
25 Supply connection and external flexible cords . 93
26 Terminals for external conductors . 101
27 Provision for earthing . 103
28 Screws and connections . 105
29 Clearances, creepage distances and solid insulation . 107
30 Resistance to heat and fire . 116
31 Resistance to rusting . 120
32 Radiation, toxicity and similar hazards . 120
Annex A (informative) Routine tests . 134
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 136
Annex C (normative) Ageing test on motors . 157
Annex D (normative) Thermal motor protectors . 158
Annex E (normative) Needle-flame test . 159
Annex F (normative) Capacitors . 160
Annex G (normative) Safety isolating transformers . 162
Annex H (normative) Switches . 163
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 165
Annex J (normative) Coated printed circuit boards . 167
Annex K (informative) Overvoltage categories . 168
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 169
Annex M (informative) Pollution degree . 172
Annex N (normative) Proof tracking test . 173
Annex O (informative) Selection and sequence of the tests of Clause 30 . 174
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 179
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 181
Annex R (normative) Software evaluation . 184
Annex S (informative) Guidance for the application of this standard on measurement
of power input and current based on the requirements of 10.1 and 10.2 concerning the
representative period . 198
Annex T (normative) UV-C radiation effect on non-metallic materials . 199
Annex U (normative) Appliances intended for remote communication through public
networks . 202
Bibliography . 206
Index of defined terms . 209
Figure 1 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of class II appliances and for parts of class ll construction . 121
Figure 2 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of other than class II appliances or parts of class ll
construction . 122
Figure 3 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral class II appliances and for parts of class ll construction . 123
Figure 4 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral appliances other than those of class II or parts of class ll
construction . 124
Figure 5 – Small part . 125
Figure 6 – Example of an electronic circuit with low-power points . 125
Figure 7 – Test finger nail . 126
Figure 8 – Flexing test apparatus . 127
Figure 9 – Constructions of cord anchorages . 128
Figure 10 – An example of parts of an earthing terminal . 129
Figure 11 – Examples of clearances . 130
Figure 12
...
IEC 60335-2-51 ®
Edition 5.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-51:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
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.
IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
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 corrigendum or an amendment might have been published.
IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
IEC 60335-2-51 ®
Edition 5.0 2023-12
EXTENDED VERSION
INTERNATIONAL
STANDARD
colour
inside
This extended version of IEC 60335-2-51:2023 includes the content of the references made to
IEC 60335-1:2020
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 23.080, 91.140.10 ISBN 978-2-8322-8048-5
IEC 60335-1:2020/ISH1:2021 – 1 –
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 60335-1
Edition 6.0 2020-09
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES – SAFETY –
Part 1: General requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by IEC technical committee 61: Safety of
household and similar electrical appliances.
The text of this Interpretation Sheet is based on the following documents:
Draft Report on voting
61/5999/DISH 61/6009/RVDISH
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
___________
INTRODUCTION
Edition 6 of IEC 60335-1:2020 defines and introduces requirements for a detachable
power supply part of an appliance. In the document, 24.2 prohibits the use of a power
supply in a flexible cord.
QUESTION:
Does Subclause 24.2 prohibit the use of a detachable power supply part?
ANSWER
No, a "detachable power supply part" is a defined term and is not captured by the term
"power supply" as used in Subclause 24.2.
NOTE A detachable power supply part is captured by the defined term when the output of the power supply
part is detachable from the class III construction part of the appliance at:
– the power supply part, or
– the class III construction part of the appliance.
However, the supply cord (if any) does not have to be detachable from the detachable power supply part.
ICS 13.120; 97.030
IEC 60335-1:2020-09/ISH1:2021-11(en)
– 2 – IEC 60335-2-51:2023 EXV © IEC 2023
CONTENTS
FOREWORD . 6
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 15
4 General requirement . 27
5 General conditions for the tests . 27
6 Classification . 31
7 Marking and instructions . 32
8 Protection against access to live parts . 40
9 Starting of motor-operated appliances . 42
10 Power input and current . 42
11 Heating . 44
12 Charging of metal-ion batteries . 50
13 Leakage current and electric strength at operating temperature . 51
14 Transient overvoltages . 54
15 Moisture resistance . 55
16 Leakage current and electric strength . 58
17 Overload protection of transformers and associated circuits . 60
18 Endurance . 60
19 Abnormal operation . 60
20 Stability and mechanical hazards . 70
21 Mechanical strength . 72
22 Construction . 73
23 Internal wiring . 86
24 Components . 88
25 Supply connection and external flexible cords . 93
26 Terminals for external conductors . 101
27 Provision for earthing . 103
28 Screws and connections . 105
29 Clearances, creepage distances and solid insulation . 107
30 Resistance to heat and fire . 116
31 Resistance to rusting . 120
32 Radiation, toxicity and similar hazards . 120
Annex A (informative) Routine tests . 134
Annex B (normative) Battery-operated appliances, separable batteries and detachable
batteries for battery-operated appliances . 136
Annex C (normative) Ageing test on motors . 157
Annex D (normative) Thermal motor protectors . 158
Annex E (normative) Needle-flame test . 159
Annex F (normative) Capacitors . 160
Annex G (normative) Safety isolating transformers . 162
Annex H (normative) Switches . 163
Annex I (normative) Motors having basic insulation that is inadequate for the rated
voltage of the appliance . 165
Annex J (normative) Coated printed circuit boards . 167
Annex K (informative) Overvoltage categories . 168
Annex L (informative) Guidance for the measurement of clearances and creepage
distances . 169
Annex M (informative) Pollution degree . 172
Annex N (normative) Proof tracking test . 173
Annex O (informative) Selection and sequence of the tests of Clause 30 . 174
Annex P (informative) Guidance for the application of this standard to appliances
used in tropical climates . 179
Annex Q (informative) Sequence of tests for the evaluation of electronic circuits . 181
Annex R (normative) Software evaluation . 184
Annex S (informative) Guidance for the application of this standard on measurement
of power input and current based on the requirements of 10.1 and 10.2 concerning the
representative period . 198
Annex T (normative) UV-C radiation effect on non-metallic materials . 199
Annex U (normative) Appliances intended for remote communication through public
networks . 202
Bibliography . 206
Index of defined terms . 209
Figure 1 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of class II appliances and for parts of class ll construction . 121
Figure 2 – Circuit diagram for leakage current measurement at operating temperature
for single-phase connection of other than class II appliances or parts of class ll
construction . 122
Figure 3 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral class II appliances and for parts of class ll construction . 123
Figure 4 – Circuit diagram for leakage current measurement at operating temperature
for three-phase with neutral appliances other than those of class II or parts of class ll
construction . 124
Figure 5 – Small part . 125
Figure 6 – Example of an electronic circuit with low-power points . 125
Figure 7 – Test finger nail . 126
Figure 8 – Flexing test apparatus . 127
Figure 9 – Constructions of cord anchorages . 128
Figure 10 – An example of parts of an earthing terminal . 129
Figure 11 – Examples of clearances . 130
Figure 12
...
IEC 60335-2-51 ®
Edition 5.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-51: Exigences particulières pour les pompes de circulation fixes pour
installations de chauffage et de distribution d'eau
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IEC 60335-2-51 ®
Edition 5.0 2023-12
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Safety –
Part 2-51: Particular requirements for stationary circulation pumps for heating
and service water installations
Appareils électrodomestiques et analogues – Sécurité –
Partie 2-51: Exigences particulières pour les pompes de circulation fixes pour
installations de chauffage et de distribution d'eau
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 23.080, 91.140.10 ISBN 978-2-8322-7818-5
– 2 – IEC 60335-2-51:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 General requirement . 8
5 General conditions for the tests . 8
6 Classification . 8
7 Marking and instructions . 9
8 Protection against access to live parts . 10
9 Starting of motor-operated appliances . 10
10 Power input and current . 10
11 Heating . 10
12 Charging of metal-ion batteries . 11
13 Leakage current and electric strength at operating temperature . 11
14 Transient overvoltages . 11
15 Moisture resistance . 11
16 Leakage current and electric strength . 11
17 Overload protection of transformers and associated circuits . 11
18 Endurance . 11
19 Abnormal operation . 11
20 Stability and mechanical hazards . 12
21 Mechanical strength . 12
22 Construction . 12
23 Internal wiring . 12
24 Components . 12
25 Supply connection and external flexible cords . 13
26 Terminals for external conductors . 13
27 Provision for earthing . 13
28 Screws and connections . 13
29 Clearances, creepage distances and solid insulation . 13
30 Resistance to heat and fire . 13
31 Resistance to rusting . 13
32 Radiation, toxicity and similar hazards . 13
Annexes . 14
Annex A (informative) Routine tests . 14
Bibliography . 15
Table 101 – Temperature classification of circulation pumps . 9
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
SAFETY –
Part 2-51: Particular requirements for stationary circulation pumps for
heating and service water installations
FOREWORD
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...
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