IEC 62040-1-2:2002

INTERNATIONAL IEC
STANDARD
62040-1-2
First edition
2002-08
Uninterruptible power systems (UPS) –
Part 1-2:
General and safety requirements for UPS
used in restricted access locations
Alimentations sans interruption (ASI) –
Partie 1-2:
Prescriptions générales et règles de sécurité pour les ASI
utilisées dans des locaux d'accès restreint

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INTERNATIONAL IEC
STANDARD
62040-1-2
First edition
2002-08
Uninterruptible power systems (UPS) –
Part 1-2:
General and safety requirements for UPS
used in restricted access locations
Alimentations sans interruption (ASI) –
Partie 1-2:
Prescriptions générales et règles de sécurité pour les ASI
utilisées dans des locaux d'accès restreint

 IEC 2002  Copyright - all rights reserved
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 the publisher.
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Международная Электротехническая Комиссия
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– 2 – 62040-1-2  IEC:2002(E)
CONTENTS
FOREWORD . 4

1 Scope and specific applications . 6

1.1 Scope . 6

1.2 Specific applications . 6

2 Normative references. 7

3 Definitions . 8

4 General requirements .11

4.1 UPS design and construction.11
4.2 User information .11
4.3 Classification of UPS .11
4.4 General conditions for tests .11
4.5 Operating parameters for tests .11
4.6 Loads for tests.12
4.7 Components .12
4.8 Power interfaces.12
4.9 Marking and instructions.12
5 Fundamental design requirements .17
5.1 Protection against electric shock and energy hazards.17
5.2 SELV .18
5.3 Emergency switching device.18
5.4 Backfeed protection.19
5.5 Insulation.19
5.6 Safety extra-low voltage (SELV) circuits .20
5.7 Limited current circuits.20
5.8 Provisions for protective earthing.20
5.9 AC and d.c. power isolation .20
5.10 Overcurrent and earth fault protection.21
5.11 Service person protection .22
5.12 Clearances, creepage distances and distances through insulation .23
5.13 External signalling circuits .23
5.14 Limited power source.23
6 Wiring, connections and supply.24

6.1 General .24
6.2 Connection to power sources.24
6.3 Wiring terminals for external power conductors.24
7 Physical requirements.25
7.1 Enclosure .25
7.2 Stability .26
7.3 Construction details .26
7.4 Resistance to fire.27
7.5 Battery location.27
7.6 Temperature rise .29
8 Electrical requirements and simulated abnormal conditions .29
8.1 General .29
8.2 Electric strength.30
8.3 Abnormal operating and fault conditions .30

62040-1-2  IEC:2002(E) – 3 –
Annexes………………………………………………………………………………………………. 32-43

Table 1 – Location of battery protective device(s) .22

Table 2 – Temperature-rise limits.29

Table 3 – Permitted temperature limits for magnetic windings
at the end of stored energy mode operation .29

Table H.1 – Degrees of protection against foreign objects indicated

by the first characteristic numeral.33

Table H.2 – Degrees of protection against water indicated by the second characteristic

numeral.34

Table P.1 − (extract from IEC 60439-1) .43

– 4 – 62040-1-2  IEC:2002(E)
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 1-2: General and safety requirements for UPS

used in restricted access locations

FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62040-1-2 has been prepared by IEC technical committee 22H:
Uninterruptible power systems (UPS), of IEC technical committee 22: Power electronic
systems and equipment.
The text of this standard is based on the following documents:
FDIS Report on voting
22H/23/FDIS 22H/25/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 3.
Annexes L, M, N and P form an integral part of this standard.
Annex H is for information only.
In this standard, the following print types are used:
– Requirements proper and normative annexes: in roman type.
– Compliance statements and test specifications: in italic type.
– Notes and other informative matter: in smaller roman type.
– Normative conditions within tables: in smaller roman type.
− Terms that are defined in clause 3: bold

62040-1-2  IEC:2002(E) – 5 –
The committee has decided that this publication remains valid until 2006. At this date, in
accordance with the committee’s decision, the publication will be

• reconfirmed;
• withdrawn;
• replaced by a revised edition, or

• amended.
The contents of the corrigendum of December 2002 have been included in this copy.

– 6 – 62040-1-2  IEC:2002(E)
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 1-2: General and safety requirements for UPS

used in restricted access locations

1 Scope and specific applications

1.1 Scope
This standard applies to electronic uninterruptible power systems with an electrical energy
storage device in the d.c. link. It is to be used with IEC 60950-1 which is referred to in this
standard as “RD”.
When any item is referred to by the phrase “The definitions or the provisions of item/RD
apply”, this phrase is intended to mean that the definitions or provisions in that item of
IEC 60950-1 apply, except any which are clearly inapplicable to uninterruptible power
systems. National requirements additional to those in IEC 60950-1 apply and are found as
notes under relevant clauses of the RD.
The primary function of the UPS covered by this standard is to ensure continuity of an
alternating power source. The UPS may al
...