IEC 62040-1:2017
(Main)Uninterruptible power systems (UPS) - Part 1: Safety requirements
Uninterruptible power systems (UPS) - Part 1: Safety requirements
IEC 62040-1:2017 applies to movable, stationary, fixed or built-in UPS for use in low-voltage distribution systems and that are intended to be installed in an area accessible by an ordinary person or in a restricted access area as applicable, that deliver fixed frequency AC output voltage with port voltages not exceeding 1 000 V AC or 1 500 V DC and that include an energy storage device. It applies to pluggable and to permanently connected UPS, whether consisting of a system of interconnected units or of independent units, subject to installing, operating and maintaining the UPS in the manner prescribed by the manufacturer.
This document specifies requirements to ensure safety for the ordinary person who comes into contact with the UPS and, where specifically stated, for the skilled person. The objective is to reduce risks of fire, electric shock, thermal, energy and mechanical hazards during use and operation and, where specifically stated, during service and maintenance.
This product standard is harmonized with the applicable parts of group safety publication IEC 62477-1:2012 for power electronic converter systems and contains additional requirements relevant to UPS.
This edition includes the following significant technical change with respect to the previous edition: the reference document has been changed from IEC 60950-1:2005 (safety for IT equipment) to IEC 62477-1 (group safety standard for power electronic converters).
The contents of the corrigendum of October 2019 have been included in this copy.
Alimentations sans interruption (ASI) - Partie 1: Exigences de sécurité
IEC 62040-1:2017 s'applique aux ASI mobiles, stationnaires, fixes ou intégrées destinées à une utilisation dans des réseaux de distribution basse tension et à être installées dans une zone accessible par une personne ordinaire ou une zone d'accès restreint, selon le cas, qui fournissent une tension de sortie en courant alternatif à fréquence fixe avec des tensions au niveau de la connexion ne dépassant pas 1 000 V en courant alternatif ou 1 500 V en courant continu, et qui incluent un dispositif de stockage de l'énergie. Elle s'applique aux ASI alimentées par une prise de courant et aux ASI raccordées en poste fixe, qu'elles soient sous la forme d'un système d'équipements interconnectés ou d'équipements indépendants destinés à être installés, à fonctionner et à être entretenus de la manière prescrite par le constructeur.
Le présent document spécifie des exigences destinées à garantir la sécurité des personnes ordinaires qui peuvent entrer en contact avec l'ASI et, lorsque cela est spécifiquement précisé, des personnes qualifiées. L'objectif est de réduire les risques d'incendie, de choc électrique, ainsi que les risques thermiques, mécaniques ou liés au niveau d'énergie pendant l'utilisation, le fonctionnement et, si spécifiquement indiqué, pendant l'entretien et la maintenance.
Cette norme de produits a été harmonisée avec les parties applicables de la publication groupée de sécurité IEC 62477-1:2012 relative aux systèmes électroniques de conversion de puissance et contient des exigences supplémentaires pertinentes pour les ASI.
Cette édition inclut la modification technique majeure suivante par rapport à l'édition précédente: le document de référence n'est plus l'IEC 60950-1:2005 (sécurité applicable aux matériels de traitement de l'information) mais l'IEC 62477-1 (norme groupée de sécurité applicable aux convertisseurs électroniques de puissance).
Le contenu du corrigendum d'octobre 2019 a été pris en considération dans cet exemplaire.
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IEC 62040-1 ®
Edition 2.0 2017-09
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This Extended version of IEC 62040-1:2017 includes the provisions of the general rules
of IEC 62477-1:2012
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
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This Extended version of IEC 62040-1:2017 includes the provisions of the general rules
of IEC 62477-1:2012
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-4886-7
– 2 – IEC 62040-1:2017 EXV © IEC 2017
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 10
3 Terms and definitions . 14
4 Protection against hazards . 27
5 Test requirements . 95
6 Information and marking requirements . 138
Annex A (normative) Additional information for protection against electric shock . 151
Annex B (informative) Considerations for the reduction of the pollution degree . 172
Annex C (informative) Symbols referred to in this document . 173
Annex D (normative) Evaluation of clearance and creepage distances . 174
Annex E (informative) Altitude correction for clearances . 181
Annex F (normative) Clearance and creepage distance determination for frequencies
greater than 30 kHz . 182
Annex G (informative) Cross-sections of round conductors . 188
Annex H (informative) Guidelines for RCD compatibility . 189
Annex I (informative) Examples of overvoltage category reduction . 193
Annex J (informative) Burn thresholds for touchable surfaces . 201
Annex K (informative) Table of electrochemical potentials . 204
Annex L (informative) Measuring instrument for touch current measurements . 205
Annex M (informative) Test probes for determining access . 206
Annex AA (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductor . 210
Annex BB (normative) Reference loads . 211
Annex CC (normative) Ventilation of lead-acid battery compartments . 215
Annex DD (informative) Guidance for disconnection of batteries during shipment . 218
Annex EE (informative) Short-time withstand current test procedure – Guidance and
typical values . 220
Annex FF (informative) Maximum heating effect in transformer tests. 224
Annex GG (normative) Requirements for the mounting means of rack-mounted
equipment . 226
Bibliography . 228
Figure 1 – Touch time - d.c. peak voltage zones of ventricular fibrillation in dry skin
condition . 37
Figure 2 – Touch time - d.c. peak voltage zones of ventricular fibrillation in water-wet
skin condition . 37
Figure 3 – Touch time - d.c. peak voltage zones of ventricular fibrillation in saltwater-
wet skin condition . 38
Figure 4 – Example of a UPS assembly and its associated protective equipotential
bonding. 42
Figure 5 – Example of a UPS assembly and its associated protective equipotential
bonding. 43
Figure 6 – Fire enclosure bottom openings below an unenclosed or partially enclosed
fire-hazardous component. 71
Figure 7 – Fire enclosure baffle construction. 72
Figure 8 – Supported and unsupported enclosure parts . 89
Figure 9 – Impact test using a steel ball . 101
Figure 10 – Voltage test procedures . 109
Figure 11 – Protective equipotential bonding impedance test for separate unit with
power fed from the UPS with protection for the power cable . 115
Figure 12 – Protective equipotential bonding impedance test for sub-assembly with
accessible parts and with power fed from the UPS . 116
Figure 13 – Circuit for high-current arcing test . 131
Figure 14 – Test fixture for hot-wire ignition test . 132
Figure 101 – Examples of design of openings preventing vertical access . 40
Figure 102 – Test circuit for load-induced change of reference potential – Single-
phase output . 119
Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
output . 119
Figure 104 – Voltage backfeed warning label . 146
Figure A.1 – Protection by DVC As with protective separation . 151
Figure A.2 – Protection by means of protective impedance . 152
Figure A.3 – Protection by using limited voltages . 153
Figure A.4 – Touch time- d.c. voltage zones for dry skin condition . 156
Figure A.5 – Touch time- d.c. voltage zones for water-wet skin condition . 156
Figure A.6 – Touch time- d.c. voltage for saltwater-wet skin condition . 157
Figure A.7 – Touch time- d.c. voltage zones of dry skin condition . 158
Figure A.8 – Touch time- d.c. voltage zones of water-wet skin condition . 158
Figure A.9 – Touch time- d.c. voltage zones of saltwater-wet skin condition . 159
Figure A.10 – Touch time- d.c. voltage zones of dry skin condition . 160
Figure A.11 – Touch time- d.c. voltage zones of water-wet skin condition . 160
Figure A.12 – Touch time- a.c. voltage zones for dry skin condition . 161
Figure A.13 – Touch time- a.c. voltage zones of water-wet skin condition . 162
Figure A.14 – Touch time- a.c. voltage of saltwater-wet skin condition . 162
Figure A.15 – Touch time- a.c. voltage zones of dry skin condition . 163
Figure A.16 – Touch time- a.c. voltage zones of water-wet skin condition . 164
Figure A.17 – Touch time- a.c. voltage zones of saltwater-wet skin condition . 164
Figure A.18 – Touch time- a.c. voltage zones of dry skin condition . 165
Figure A.19 – Touch time- a.c. voltage zones of water-wet skin condition . 166
Figure A.20 – Typical waveform for a.c. working voltage . 167
Figure A.21 – Typical waveform for d.c. working voltage . 167
Figure A.22 – Typical waveform for pulsating working voltage . 168
Figure F.1 – Diagram for dimensioning of clearances . 183
Figure F.2 – Diagram for dimensioning of creepage distances . 185
Figure F.3 – Permissible field strength for dimensioning of solid insulation according
to Equation (1) . 187
Figure H.1 – Flow chart leading to selection of the RCD type upstream of a UPS . 189
– 4 – IEC 62040-1:2017 EXV © IEC 2017
Figure H.2 – Fault current waveforms in connections with power electronic converter
devices . 191
Figure I.1 – Basic insulation evaluation for circuits connected to the origin of the
installation mains supply . 193
Figure I.2 – Basic insulation evaluation for circuits connected to the mains supply . 194
Figure I.3 – Basic insulation evaluation for single and three phase equipment not
permanently connected to the mains supply . 194
Figure I.4 – Basic insulation evaluation for circuits connected to the origin of the
installation mains supply where internal SPDs are used . 194
Figure I.5 – Basic insulation evaluation for circuits connected to the mains supply
where internal
...
IEC 62040-1 ®
Edition 2.1 2021-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
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Uninterruptible power systems (UPS) –
Part 1: Safety requirements
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STANDARD
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Uninterruptible power systems (UPS) –
Part 1: Safety requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.200 ISBN 978-2-8322-9836-7
IEC 62040-1 ®
Edition 2.1 2021-05
CONSOLIDATED VERSION
REDLINE VERSION
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
– 2 – IEC 62040-1:2017+AMD1:2021 CSV
© IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Protection against hazards . 15
5 Test requirements . 29
6 Information and marking requirements . 42
Annexes . 49
Annex A (normative) Additional information for protection against electric shock . 50
Annex M (informative) Test probes for determining access . 51
Annex AA (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductor . 52
Annex BB (normative) Reference loads . 54
Annex CC (normative) Ventilation of lead-acid battery compartments . 58
Annex DD (informative) Guidance for disconnection of batteries during shipment . 61
Annex EE (informative) Short-time withstand current test procedure – Guidance and
typical values . 63
Annex FF (informative) Maximum heating effect in transformer tests. 67
Annex GG (normative) Requirements for the mounting means of rack-mounted
equipment . 69
Bibliography . 71
Figure 101 – Examples of design of openings preventing vertical access . 18
Figure 102 – Test circuit for load-induced change of reference potential – Single-
phase output . 35
Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
output . 35
Figure 104 – Voltage backfeed warning label . 45
Figure M.101 – Jointed test finger (IP2X) . 52
Figure BB.1 – Reference resistive load . 54
Figure BB.2 – Reference inductive-resistive load (series) . 55
Figure BB.3 – Reference inductive-resistive load (parallel) . 55
Figure BB.4 – Reference capacitive-resistive load (series) . 55
Figure BB.5 – Reference capacitive-resistive load (parallel) . 55
Figure BB.6 – Reference non-linear load . 56
Figure DD.1 – Precautionary label for products shipped with the battery disconnected . 61
Figure DD.2 – Precautionary label for products shipped with the battery connected . 62
Figure EE.1 – 3-wire test circuit for UPS short-time withstand current . 63
Figure EE.2 – 4-wire test circuit for UPS short-time withstand current . 64
Figure EE.3 – 2-wire test circuit for single phase UPS short-time withstand current . 65
Table 1 – Alphabetical list of terms . 9
© IEC 2021
Table 101 – UPS input port configuration . 16
Table 102 – Overvoltage categories . 19
Table 103 – Maximum temperature limits for magnetic components during stored
energy mode of operation . 22
Table 22 – Test overview . 29
Table 104 – Short-time withstand current . 37
Table 105 – Temperature limits for transformer windings . 40
Table A.101 – Comparison of limits of working voltage . 50
Table AA.1 – Conductor cross-sections (extract from IEC 61439-1:2011) . 53
Table FF.1 – Test steps . 67
– 4 – IEC 62040-1:2017+AMD1:2021 CSV
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 1: Safety requirements
FOREWORD
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IEC 62040-1 edition 2.1 contains the second edition (2017-07) [documents 22H/217/FDIS
and 22H/218/RVD], its corrigendum (2019-10) and its amendment 1 (2021-05)
[documents 22H/269/FDIS and 22H/271/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
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© IEC 2021
International Standard IEC 62040-1 has been prepared by subcommittee 22H: Uninterruptible
power systems (UPS), of IEC technical committee 22: Power electronic systems and
equipment.
This second edition constitutes a technical revision.
This edition includes the following significant technical change with respect to the previous
edition: the reference document has been changed from IEC 60950-1:2005 (safety for IT
equipment) to IEC 62477-1 (group safety standard for power electronic converters).
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be read in conjunction with IEC 62477-1:2012.
The provisions of the general rules dealt within IEC 62477-1:2012 are only applicable to this
document insofar as they are specifically cited. Clauses and subclauses of IEC 62477-1:2012
that are applicable in this document are identified by reference to IEC 62477-1:2012, for
example, "Clause 4 of IEC 62477-1:2012 applies, except as follows".
The exceptions are then listed. The exceptions can take the form of a deletion, a replacement
or an ad
...
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Edition 2.0 2017-07
INTERNATIONAL
STANDARD
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INTERNATIONALE
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Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
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IEC 62040-1 ®
Edition 2.0 2017-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-4469-2
– 2 – IEC 62040-1:2017 © IEC 2017
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Protection against hazards . 15
5 Test requirements . 28
6 Information and marking requirements . 42
Annexes . 49
Annex A (normative) Additional information for protection against electric shock . 50
Annex M (informative) Test probes for determining access . 51
Annex AA (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductor . 52
Annex BB (normative) Reference loads . 54
Annex CC (normative) Ventilation of lead-acid battery compartments . 58
Annex DD (informative) Guidance for disconnection of batteries during shipment . 61
Annex EE (informative) Short-time withstand current test procedure – Guidance and
typical values . 63
Annex FF (informative) Maximum heating effect in transformer tests. 67
Annex GG (normative) Requirements for the mounting means of rack-mounted
equipment . 69
Bibliography . 71
Figure 101 – Examples of design of openings preventing vertical access . 18
Figure 102 – Test circuit for load-induced change of reference potential – Single-
phase output . 34
Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
output . 34
Figure 104 – Voltage backfeed warning label . 45
Figure M.101 – Jointed test finger (IP2X) . 52
Figure BB.1 – Reference resistive load . 54
Figure BB.2 – Reference inductive-resistive load (series) . 55
Figure BB.3 – Reference inductive-resistive load (parallel) . 55
Figure BB.4 – Reference capacitive-resistive load (series) . 55
Figure BB.5 – Reference capacitive-resistive load (parallel) . 55
Figure BB.6 – Reference non-linear load . 56
Figure DD.1 – Precautionary label for products shipped with the battery disconnected . 61
Figure DD.2 – Precautionary label for products shipped with the battery connected . 62
Figure EE.1 – 3-wire test circuit for UPS short-time withstand current . 63
Figure EE.2 – 4-wire test circuit for UPS short-time withstand current . 64
Figure EE.3 – 2-wire test circuit for single phase UPS short-time withstand current . 65
Table 1 – Alphabetical list of terms . 9
Table 101 – UPS input port configuration . 16
Table 102 – Overvoltage categories . 19
Table 103 – Maximum temperature limits for magnetic components during stored
energy mode of operation . 21
Table 22 – Test overview . 29
Table 104 – Short-time withstand current . 37
Table 105 – Temperature limits for transformer windings . 40
Table A.101 – Comparison of limits of working voltage . 50
Table AA.1 – Conductor cross-sections (extract from IEC 61439-1:2011) . 53
Table FF.1 – Test steps . 67
– 4 – IEC 62040-1:2017 © IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 1: Safety requirements
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 la
...
IEC 62040-1 ®
Edition 2.2 2022-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
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
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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.
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The world's leading online dictionary on electrotechnology,
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containing more than 22 300 terminological entries in English
details all new publications released. Available online and
and French, with equivalent terms in 19 additional languages.
once a month by email.
Also known as the International Electrotechnical Vocabulary
(IEV) online.
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Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.
A propos des publications IEC
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Le premier dictionnaire d'électrotechnologie en ligne au
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Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
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IEC 62040-1 ®
Edition 2.2 2022-11
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-6193-4
IEC 62040-1 ®
Edition 2.2 2022-11
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
– 2 – IEC 62040-1:2017+AMD1:2021
+AMD2:2022 CSV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Protection against hazards . 15
5 Test requirements . 29
6 Information and marking requirements . 42
Annexes . 49
Annex A (normative) Additional information for protection against electric shock . 50
Annex M (informative) Test probes for determining access . 51
Annex AA (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductor . 52
Annex BB (normative) Reference loads . 54
Annex CC (normative) Ventilation of lead-acid battery compartments . 58
Annex DD (informative) Guidance for disconnection of batteries during shipment . 61
Annex EE (informative) Short-time withstand current test procedure – Guidance and
typical values . 63
Annex FF (informative) Maximum heating effect in transformer tests. 67
Annex GG (normative) Requirements for the mounting means of rack-mounted
equipment . 69
Bibliography . 71
Figure 101 – Examples of design of openings preventing vertical access . 18
Figure 102 – Test circuit for load-induced change of reference potential – Single-
phase output . 35
Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
output . 35
Figure 104 – Voltage backfeed warning label . 45
Figure M.101 – Jointed test finger (IP2X) . 52
Figure BB.1 – Reference resistive load . 54
Figure BB.2 – Reference inductive-resistive load (series) . 55
Figure BB.3 – Reference inductive-resistive load (parallel) . 55
Figure BB.4 – Reference capacitive-resistive load (series) . 55
Figure BB.5 – Reference capacitive-resistive load (parallel) . 55
Figure BB.6 – Reference non-linear load . 56
Figure DD.1 – Precautionary label for products shipped with the battery disconnected . 61
Figure DD.2 – Precautionary label for products shipped with the battery connected . 62
Figure EE.1 – 3-wire test circuit for UPS short-time withstand current . 63
Figure EE.2 – 4-wire test circuit for UPS short-time withstand current . 64
Figure EE.3 – 2-wire test circuit for single phase UPS short-time withstand current . 65
Table 1 – Alphabetical list of terms . 9
+AMD2:2022 CSV © IEC 2022
Table 101 – UPS input port configuration . 16
Table 102 – Overvoltage categories . 19
Table 103 – Maximum temperature limits for magnetic components during stored
energy mode of operation . 22
Table 22 – Test overview . 29
Table 104 – Short-time withstand current . 37
Table 105 – Temperature limits for transformer windings . 40
Table A.101 – Comparison of limits of working voltage . 50
Table AA.1 – Conductor cross-sections (extract from IEC 61439-1:2011) . 53
Table FF.1 – Test steps . 67
– 4 – IEC 62040-1:2017+AMD1:2021
+AMD2:2022 CSV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 1: Safety requirements
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
...
IEC 62040-1 ®
Edition 2.1 2021-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
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 l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.
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
committee, …). It also gives information on projects, replaced have 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
and French, with equivalent terms in 19 additional languages.
once 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.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) 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 IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.
IEC Products & Services Portal - products.iec.ch
Recherche de publications IEC -
webstore.iec.ch/advsearchform Découvrez notre puissant moteur de recherche et consultez
La recherche avancée permet de trouver des publications IEC gratuitement tous les aperçus des publications. Avec un
en utilisant différents critères (numéro de référence, texte, abonnement, vous aurez toujours accès à un contenu à jour
comité d’études, …). Elle donne aussi des informations sur adapté à vos besoins.
les projets et les publications remplacées ou retirées.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
Le premier dictionnaire d'électrotechnologie en ligne au
Restez informé sur les nouvelles publications IEC. Just
monde, avec plus de 22 300 articles terminologiques en
Published détaille les nouvelles publications parues.
anglais et en français, ainsi que les termes équivalents dans
Disponible en ligne et une fois par mois par email.
19 langues additionnelles. Egalement appelé Vocabulaire
Electrotechnique International (IEV) en ligne.
Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC 62040-1 ®
Edition 2.1 2021-05
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.200 ISBN 978-2-8322-2201-0
IEC 62040-1 ®
Edition 2.1 2021-05
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Uninterruptible power systems (UPS) –
Part 1: Safety requirements
Alimentations sans interruption (ASI) –
Partie 1: Exigences de sécurité
– 2 – IEC 62040-1:2017+AMD1:2021 CSV
© IEC 2021
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Protection against hazards . 15
5 Test requirements . 29
6 Information and marking requirements . 42
Annexes . 49
Annex A (normative) Additional information for protection against electric shock . 50
Annex M (informative) Test probes for determining access . 51
Annex AA (informative) Minimum and maximum cross-section of copper conductors
suitable for connection to terminals for external conductor . 52
Annex BB (normative) Reference loads . 54
Annex CC (normative) Ventilation of lead-acid battery compartments . 58
Annex DD (informative) Guidance for disconnection of batteries during shipment . 61
Annex EE (informative) Short-time withstand current test procedure – Guidance and
typical values . 63
Annex FF (informative) Maximum heating effect in transformer tests. 67
Annex GG (normative) Requirements for the mounting means of rack-mounted
equipment . 69
Bibliography . 71
Figure 101 – Examples of design of openings preventing vertical access . 18
Figure 102 – Test circuit for load-induced change of reference potential – Single-
phase output . 35
Figure 103 – Test circuit for load-induced change of reference potential – Three-phase
output . 35
Figure 104 – Voltage backfeed warning label . 45
Figure M.101 – Jointed test finger (IP2X) . 52
Figure BB.1 – Reference resistive load . 54
Figure BB.2 – Reference inductive-resistive load (series) . 55
Figure BB.3 – Reference inductive-resistive load (parallel) . 55
Figure BB.4 – Reference capacitive-resistive load (series) . 55
Figure BB.5 – Reference capacitive-resistive load (parallel) . 55
Figure BB.6 – Reference non-linear load . 56
Figure DD.1 – Precautionary label for products shipped with the battery disconnected . 61
Figure DD.2 – Precautionary label for products shipped with the battery connected . 62
Figure EE.1 – 3-wire test circuit for UPS short-time withstand current . 63
Figure EE.2 – 4-wire test circuit for UPS short-time withstand current . 64
Figure EE.3 – 2-wire test circuit for single phase UPS short-time withstand current . 65
Table 1 – Alphabetical list of terms . 9
© IEC 2021
Table 101 – UPS input port configuration . 16
Table 102 – Overvoltage categories . 19
Table 103 – Maximum temperature limits for magnetic components during stored
energy mode of operation . 22
Table 22 – Test overview . 29
Table 104 – Short-time withstand current . 37
Table 105 – Temperature limits for transformer windings . 40
Table A.101 – Comparison of limits of working voltage . 50
Table AA.1 – Conductor cross-sections (extract from IEC 61439-1:2011) . 53
Table FF.1 – Test steps . 67
– 4 – IEC 62040-1:2017+AMD1:2021 CSV
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 1: Safety requirements
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall
...
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