EN 62040-1-1:2003

SLOVENSKI SIST EN 62040-1-1:2003

STANDARD
junij 2003
Uninterruptible power systems (UPS) - Part 1-1: General and safety requirements
for UPS used in operator access areas (IEC 62040-1-1:2002 + Corrigendum 2002)
ICS 29.200 Referenčna številka
©  Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

EUROPEAN STANDARD EN 62040-1-1
NORME EUROPÉENNE
EUROPÄISCHE NORM January 2003

ICS 29.200 Supersedes EN 50091-1-1:1996

English version
Uninterruptible power systems (UPS)
Part 1-1: General and safety requirements for UPS
used in operator access areas
(IEC 62040-1-1:2002 + corrigendum 2002)

Alimentations sans interruption (ASI) Unterbrechungsfreie
Partie 1-1: Prescriptions générales Stromversorgungssysteme (USV)
et règles de sécurité pour les ASI Teil 1-1: Allgemeine Anforderungen
utilisées dans des locaux und Sicherheitsanforderungen
accessibles aux opérateurs an USV außerhalb abgeschlossener
(CEI 62040-1-1:2002 + corrigendum 2002) Betriebsräume
(IEC 62040-1-1:2002 + Corrigendum 2002)

This European Standard was approved by CENELEC on 2002-11-01. CENELEC members are bound to
comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and
notified to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta,
Netherlands, Norway, Portugal, Slovakia, Spain, Sweden, Switzerland and United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2003 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 62040-1-1:2003 E
Foreword
The text of document 22H/22/FDIS, future edition 1 of IEC 62040-1-1, prepared by SC 22H,
Uninterruptible power systems (UPS), of IEC TC 22, Power electronic systems and equipment, was
submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62040-1-1 on
2002-11-01.
This European Standard supersedes EN 50091-1-1:1996.

The following dates were fixed:

– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2003-08-01

– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2005-11-01

Annexes designated "normative" are part of the body of the standard.
Annexes designated "informative" are given for information only.
In this standard, annexes L, M, N and ZA are normative and annexes H and X are informative.
Annex ZA has been added by CENELEC.

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.
__________
Endorsement notice
The text of the International Standard IEC 62040-1-1:2002 and its corrigendum December 2002 was
approved by CENELEC as a European Standard without any modification.
__________
- 3 - EN 62040-1-1:2003
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies (including
amendments).
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
Publication Year Title EN/HD Year
IEC 60417 Series Graphical symbols for use on EN 60417 Series
equipment
IEC 60529 1989 Degrees of protection provided by EN 60529 1991
enclosures (IP Code) + corr. May 1993

IEC/TR 60755 1983 General requirements for residual - -
A1 1988 current operated protective devices
A2 1992
IEC 60950-1 (mod) 2001 Information technology equipment - EN 60950-1 2001
Safety
Part 1: General requirements
IEC 61000-2-2 2002 Electromagnetic compatibility (EMC) EN 61000-2-2 2002
Part 2-2: Environment - Compatibility
levels for low-frequency conducted
disturbances and signalling in public
low-voltage power supply systems

1)
IEC 61008-1 1996 Residual current operated circuit-- -
breakers without integral overcurrent
protection for household and similar
uses (RCCBs)
Part 1: General rules
2)
IEC 61009-1 1996 Residual current operated circuit-- -
breakers with integral overcurrent
protection for household and similar
uses (RCBO's)
Part 1: General rules
1)
The European Standard EN 61008-1:1994 (IEC 61008-1:1990 + A1:1992, mod.) + corrigendum December 1997 + A2:1995
(IEC/A2:1995) + A11:1995 + A12:1998 + corrigendum April 1998 + A13:1998 + A14:1998 applies.
2)
The European Standard EN 61009-1:1994 (IEC 61009-1:1991, mod.) + corrigendum December 1997 + A1:1995 (IEC/A1:1995)
+ A11:1995 + A2:1998 + A13:1998 + corrigendum April 1998 + A14:1998 + A15:1998 + A17:1998 applies.

Publication Year Title EN/HD Year
IEC 62040-1-2 2002 Uninterruptible power systems (UPS)
+ corr. December 2002 Part 1-2: General and safety EN 62040-1-2 2003
requirements for UPS used in
restricted access locations
IEC 62040-2 1999 Part 2: Electromagnetic compatibility - -
(EMC) requirements
IEC 62040-3 (mod) 1999 Part 3: Method of specifying the EN 62040-3 2001
performance and test requirements

NORME CEI
INTERNATIONALE
IEC
62040-1-1
INTERNATIONAL
Première édition
STANDARD
First edition
2002-08
Alimentations sans interruption (ASI) –
Partie 1-1:
Exigences générales et règles de sécurité
pour les ASI utilisées dans des locaux
accessibles aux opérateurs
Uninterruptible power systems (UPS) –
Part 1-1:
General and safety requirements
for UPS used in operator access areas
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62040-1-1  IEC:2004 – 3 –
CONTENTS
FOREWORD.7

1 Scope and specific applications .11
1.1 Scope.11
1.2 Specific applications.11
2 Normative references.13
3 Definitions.15
4 General conditions for tests .21
4.1 Operating parameters for tests .21
4.2 Loads for tests .21
4.3 Components.23
4.4 Power interfaces.23
4.5 Marking and instructions.23
5 Fundamental design requirements .33
5.1 Protection against electric shock and energy hazards .33
5.2 Insulation.37
5.3 Limited current circuits .37
5.4 Provisions for protective earthing .37
5.5 AC and d.c. power isolation.37
5.6 Overcurrent and earth fault protection .39
5.7 Protection of personnel – Safety interlocks.43
5.8 Clearances, creepage distances and distances through insulation.45
5.9 External signalling circuits.45
5.10 Limited power source.45
6 Wiring, connections and supply.47
6.1 General.47
6.2 Connection to power .47
6.3 Wiring terminals for external power conductors .47
7 Physical requirements.47
7.1 Enclosure.47
7.2 Stability.49
7.3 Mechanical strength.49
7.4 Construction details.49
7.5 Resistance to fire.51
7.6 Battery location.51
7.7 Temperature rise.55
8 Electrical requirements and simulated abnormal conditions.57
8.1 General.57
8.2 Electric strength.57
8.3 Abnormal operating and fault conditions.57
9 Connection to telecommunication networks.59

62040-1-1  IEC:2004 – 5 –
Annex H (informative) Guidance on protection against ingress of water and foreign objects . 63
Annex L (normative) Backfeed protection test .67
Annex M (normative) Examples of reference load conditions .71
Annex N (normative) Ventilation of battery compartments .79
Annex X (informative) Guidance for disconnection of batteries during shipment .85

Bibliography.89

Figure L.1 – Potential load faults .69
Figure X.1 – Precautionary label for products shipped with the battery disconnected .85
Figure X.2 – Precautionary label for products shipped with the battery connected .87

Table 1 – Location of battery protective device(s) .41
Table 2 – Temperature-rise limits.55
Table 3 – Permitted temperature limits for magnetic windings at the end of stored
energy mode operation .55
Table H.1 – Degrees of protection against foreign objects indicated by the first
characteristic numeral.63
Table H.2 – Degrees of protection against water indicated by the second characteristic
numeral .65

62040-1-1  IEC:2004 – 7 –
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 1-1: General and safety requirements for UPS
used in operator access areas
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62040-1-1 has been prepared by subcommittee 22H: Uninter-
ruptible power systems (UPS), of IEC technical committee 22: Power electronic systems and
equipment.
This bilingual version (2004-02) replaces the English version and its corrigenda 1 (2002-12)
and 2 (2004-02).
The text of this standard is based on the following documents:
FDIS Report on voting
22H/22/FDIS 22H/24/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.
The French version of this standard has not been voted upon.

62040-1-1  IEC:2004 – 9 –
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
It is to be used with IEC 60950-1 which is referred to in this standard as "RD".
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.
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
62040-1-1  IEC:2004 – 11 –
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –

Part 1-1: General and safety requirements for UPS
used in operator access areas
1 Scope and specific applications
1.1 Scope
This part of IEC 62040 applies to electronic uninterruptible power systems (UPS) 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 also serve to improve the quality of the power source
by keeping it within specified characteristics.
This standard is applicable to UPS which are movable, stationary, fixed or for building-in, for
use on low-voltage distribution systems and intended to be installed in any operator
accessible area. It specifies requirements to ensure safety for the operator and layman who
may come into contact with the equipment and, where specifically stated, for the service
person.
This standard is intended to ensure the safety of installed UPS, both as a single UPS unit or
as a system of interconnected UPS units, subject to installing, operating and maintaining the
UPS in the manner prescribed by the manufacturer.
This standard does not cover d.c. supplied electronic ballasts (IEC 61347 and IEC 60925),
UPS intended to be installed in separated electrical locations and UPS based on rotating
machines.
The relevant general and safety requirements for UPS installed in restricted access locations
are given in IEC 62040-1-2; electromagnetic compatibility (EMC) requirements and definitions
are given in IEC 62040-2.
1.2 Specific applications
Even if this standard does not cover all types of UPS, it may be taken as a guide for such
equipment. Requirements additional to those specified in this standard may be necessary for
specific applications, for example:
– UPS intended for operation while exposed, for example, to extremes of temperature; to
excessive dust, moisture, or vibration; to flammable gases; to corrosive or explosive
atmospheres;
62040-1-1  IEC:2004 – 13 –
– electromedical applications with the UPS located within 1,5 m from the patient contact
area;
– for UPS subject to transient overvoltages exceeding those for Overvoltage Category II
according to IEC 60664, additional protection might be necessary in the mains supply to
the UPS;
– UPS intended for use where ingress of water and foreign objects are possible, additional
requirements may be necessary; for guidance on such requirements and for relevant
testing, see annex H;
– UPS with trapezoidal output waveforms and long run times (greater than 30 min) in
addition to complying with 5.3.1.2 of IEC 62040-3 are subject to voltage distortion tests for
the purpose of load compatibility.
NOTE For UPS intended to be used in vehicles, on board ships or aircraft, in tropical countries, or on elevations
greater than 1 000 m, different requirements may be necessary.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60417-DB:2002 , Graphical symbols for use on equipment
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60664 (all parts), Insulation coordination for equipment within low-voltage systems
IEC 60755:1983, General requirements for residual current operated protective devices
Amendment 1 (1988)
Amendment 2 (1992)
IEC 60617-DB:2001 , Graphical symbols for diagrams
IEC 60950-1:2001, Information technology equipment – Safety – Part 1: General requirements
IEC 61000-2-2:2002, Electromagnetic compatibility (EMC) – Part 2-2: Environment –
Compatibility levels for low-frequency conducted disturbances and signalling in public
low-voltage power supply systems
IEC 61008-1:1996, Residual current operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs) – Part 1: General rules
IEC 61009-1:1996, Residual current operated circuit-breakers with integral overcurrent
protection for household and similar uses (RCBOs) – Part 1: General rules
___________
“DB” refers to the IEC on-line database.
“DB” refers to the IEC on-line database.

62040-1-1  IEC:2004 – 15 –
IEC 62040-1-2:2004, Uninterruptible power systems (UPS) – Part 1-2: General and safety
requirements for UPS used in restricted access locations
IEC 62040-2:1999, Uninterruptible power systems (UPS) – Part 2: Electromagnetic compatibility
(EMC) requirements
IEC 62040-3:1999, Uninterruptible power systems (UPS) – Part 3: Method of specifying the
performance and test requirements
3 Definitions
3.1 General
For the purposes of this standard, the following definitions apply as well as some of the
definitions of IEC 60950-1. Where the terms "voltage" and "current" are used, they imply the
r.m.s. values, unless otherwise specified.
NOTE Care should be taken that measurement instruments give a true r.m.s. reading in the presence of non-
sinusoidal signals.
3.1.1
uninterruptible power system (UPS)
combination of convertors, switches and energy storage devices (for example, batteries),
constituting a power system for maintaining continuity of load power in case of input power
failure
3.1.2
bypass
power path alternative, either internal or external to the UPS
3.1.3
primary power
power supplied by an electrical utility company or by a user’s generator
3.1.4
backfeed
condition in which a voltage or energy available within the UPS is fed back to any of the input
terminals, either directly or by a leakage path while operating in the stored energy mode and
with primary power not available
3.1.5
backfeed protection
control scheme that reduces the risk of electric shock due to backfeed
3.1.6
stored energy mode
operation of the UPS when supplied by the following conditions:
– primary power is disconnected or is out of a given tolerance;
– battery is being discharged;
– load is within the given range;
– output voltage is within the given tolerance

62040-1-1  IEC:2004 – 17 –
3.2 UPS electrical ratings
3.2.1
rated voltage
input or output voltage (for three-phase supply, the phase-to-phase voltage) as declared by
the manufacturer
3.2.2
rated voltage range
input or output voltage range as declared by the manufacturer, expressed by its lower and
upper rated voltages
3.2.3
rated current
maximum input or output current of the UPS as declared by the manufacturer
3.3 Load types
3.3.1
normal load
mode of operation which approximates as closely as possible the most severe conditions of
normal use in accordance with the manufacturer’s operating instructions. However, when the
conditions of actual use can obviously be more severe than the maximum load conditions
recommended by the manufacturer, a load shall be used that is representative of the
maximum that can be applied
NOTE For examples of reference normal load conditions for UPS, see Annex M.
3.3.2
linear load
load where the current drawn from the supply is defined by the relationship:
I = U/Z
where
I is the load current;
U is the supply voltage;
Z is the load impedance
3.3.3
non-linear load
load where the parameter Z (load impedance) is no longer a constant but is a variable
dependent on other parameters, such as voltage or time (see Annex M)
3.4 Connection to the supply
The definitions of 1.2.5/RD apply together with the following.
3.4.1
power cord
flexible cord or cable for interconnection purposes
3.5 Circuits and circuit characteristics
The definitions of 1.2.8/RD apply.

62040-1-1  IEC:2004 – 19 –
3.5.1
hazardous voltage
The definition in 1.2.8.5/RD applies.
3.6 Insulation
The definitions of 1.2.9/RD apply.
3.7 Equipment mobility
The definitions of 1.2.3/RD apply.
3.8 Insulation classes of UPS
The definitions of 1.2.4/RD apply.
3.9 Enclosures
The definitions of 1.2.6/RD apply.
3.10 Accessibility
The definitions of 1.2.7/RD apply.
3.11 Components
The definitions of 1.2.11/RD apply.
3.12 Power distribution
The definitions of 1.2.8/RD apply.
3.13 Flammability
The definitions of 1.2.12/RD apply.
3.14 Miscellaneous
The definitions of 1.2.13/RD apply together with the following.
3.14.1
type test
The definition of 1.4.2/RD applies together with the following addition.
Where in this standard compliance of materials, components or subassemblies is checked by
inspection or by testing of properties, it is permitted to confirm compliance by reviewing any
relevant data or previous test results that are available instead of carrying out the specified
type tests.
NOTE For physically large units and/or power ratings, adequate test facilities to demonstrate some of the type
tests may not exist.
This situation also applies to some electrical tests for which no commercial test simulation
equipment is available or requires specialized test facilities beyond the scope of the
manufacturer's premises.
62040-1-1  IEC:2004 – 21 –
3.15 Telecommunication networks
The following definitions apply:
1.2.8.9/RD, 1.2.8.10/RD, 1.2.8.11/RD, 1.2.8.12/RD, 1.2.13.8/RD
4 General conditions for tests
The provisions of 1.4.1/RD, 1.4.2/RD, 1.4.3/RD, 1.4.6/RD, 1.4.7/RD, 1.4.8/RD, 1.4.10/RD,
1.4.11/RD, 1.4.12/RD, 1.4.13/RD, 1.4.14/RD apply together with the following.
Only the leakage current and heating tests shall be performed at input voltage tolerances. All
other tests shall be run at nominal input voltages.
4.1 Operating parameters for tests
Except where specific test conditions are stated elsewhere in the standard, and where it
is clear that there is a significant impact on the results of the test, the tests shall be carried
out under the most unfavourable combination of the following parameters, within the
manufacturer's operating specifications:
– supply voltage;
– absence of supply voltage;
– supply frequency;
– charge condition of the battery;
– physical location of UPS and position of movable parts;
– operating mode;
– adjustments of thermostats, regulating devices or similar controls in operator access
areas, which are
a) adjustable without the use of a tool, or
b) adjustable using a means, such as a key or a tool, deliberately provided for the
operator.
4.2 Loads for tests
In determination of input current, and where other test results could be affected, the following
variables shall be considered and adjusted to give the most unfavourable results:
– loads due to recharging of batteries;
– loads due to optional features, offered or provided for by the manufacturer for inclusion in
or with the equipment under test;
– loads due to other units of equipment intended by the manufacturer to draw power from
the equipment under test;
– loads that could be connected to any standard supply outlets in operator access areas
on the equipment, up to the value indicated in the marking required by 4.5.2.
Artificial loads may be used to simulate such loads during testing.

62040-1-1  IEC:2004 – 23 –
4.3 Components
The provisions of 1.5.1/RD, 1.5.2/RD, 1.5.4/RD, 1.5.5/RD, 1.5.6/RD, 1.5.7/RD, 1.5.8/RD apply.
4.4 Power interfaces
The provisions of 1.6.1/RD, 1.6.2/RD, 1.6.4/RD apply together with the following.
The neutral conductors, if any, shall be insulated from earth and the body throughout the
equipment, as if they were a phase conductor. Components connected between neutral and
earth shall be rated for a working voltage equal to the phase-to-neutral voltage. In the case
of the output neutral conductor being isolated from the input neutral conductor, the service
person responsible for the installation shall connect this output neutral conductor as required
by local wiring rules and as detailed in the installation instructions.
Compliance is checked by inspection.
4.5 Marking and instructions
4.5.1 General
Where a marking is required as detailed below, provision shall be allowed for equivalent
wording. For equipment intended to be installed by anyone other than a service person, the
marking shall be readily visible either in an operator access area or shall be located on an
outside surface of the equipment. If located on an outside surface of fixed equipment, the
marking shall be visible after the equipment has been installed as in normal use.
Markings that are not visible from the outside of the equipment are considered to be in
compliance if they are directly visible when opening a door or cover. If the area behind a door
or cover is not an operator access area, a readily visible marker shall be attached to the
equipment to clearly indicate the location of the marking; it is allowed to use a temporary
marker.
4.5.2 Power rating
Equipment shall be provided with adequate markings in order to specify
– input supply requirements,
– output supply ratings.
For equipment with multiple rated voltages, the corresponding rated currents shall be
marked such that the different current ratings are separated by a solidus (/) and the relation
between rated voltage and associated rated current appears distinctly.
Equipment with a rated voltage range shall be marked with either the maximum rated
current or with the current range.
The markings of input and output shall include those in the RD, in addition to the following:
– output rated voltage;
– output rated current or rated power in volt-amperes or active power in watts;

62040-1-1  IEC:2004 – 25 –
– output rated power factor, if less than unity, or active power and apparent power or active
power and rated current;
– number of output phases (1φ – 3φ) with or without neutral;
– output rated active power, in watts or kilowatts according to Annex M;
– output rated apparent power in volt-amperes or kilovoltamperes according to Annex M;
– maximum ambient operating temperature range (optional).
NOTE Compliance according to Annex M.
For units designed with additional separate automatic bypass/maintenance bypass, additional
input a.c. supply, or external batteries, it shall be allowed for relevant supply ratings to be
specified in the accompanying installation instructions. Where this is done, the following
instruction shall appear on or near the point of connection.
SEE INSTALLATION INSTRUCTIONS BEFORE
CONNECTING TO THE SUPPLY
If a unit is not provided with a means for direct connection to the supply mains, it need not be
marked with its rated current.
4.5.3 Safety instructions
It is necessary to take special precautions to avoid the introduction of hazards when
operating, installing, maintaining, transporting or storing UPS; the manufacturer shall make
available the necessary instructions.
NOTE 1 Special precautions may be necessary, for example, for battery connection of the equipment to the
supply and the interconnection of separate units, if any. The protective connection of the UPS, of the battery
cabinet and terminals or outlets for equipment supplied by UPS should remain interconnected even when the mains
plug of the UPS is disconnected.
NOTE 2 Where appropriate, installation instructions should include reference to national wiring rules.
NOTE 3 Maintenance information is normally made available only to service persons.
The operating instructions and, for pluggable equipment intended for user installation, the
installation instructions shall be made available to the user.
The manufacturer shall provide the user with guidance on the level of competence necessary
for installation, for example:
– operator installable: any pluggable type A or pluggable type B equipment with battery
already installed by the supplier;
– service person installable: any fixed equipment or equipment with batteries not installed
when delivered to the user.
The manufacturer shall provide the user with guidance on the level of competence necessary
to operate the equipment as
– operated by laymen;
– operated by experienced personnel.
When the disconnect device for isolation of mains power is not incorporated in the equipment
(see 3.4.2/RD) or when the plug on the power supply cord is intended to serve as the
disconnect device, the installation instructions shall state that

62040-1-1  IEC:2004 – 27 –
– for permanently connected equipment, an appropriate and readily accessible disconnect
device shall be incorporated in the fixed wiring;
– for pluggable UPS, the mains socket outlet that supplies the UPS shall be installed near
the UPS and shall be easily accessible. When the UPS power cord must be connected to
an earthed mains socket outlet for safety reasons, the UPS marking or installation
instructions shall so state; the same requirement for marking applies to any special
equipotential earth bonding to other connected UPS equipment or Class I loads.
NOTE 4 Pluggable power cords are normally 2 m in length or less.
For permanently connected UPS without internal automatic backfeed isolation (see 5.1.4),
the instructions shall require the fitting by the user of a warning label on all primary power
isolators installed remote from the UPS area, to warn electrical maintenance personnel that
the circuit feeds a UPS.
The warning label shall carry the following wording or equivalent.
ISOLATE UNINTERRUPTIBLE POWER SUPPLY (UPS)
BEFORE WORKING ON THIS CIRCUIT
4.5.4 Main voltage adjustment
See 1.7.4/RD.
4.5.5 Power outlets
See 1.7.5/RD.
4.5.6 Fuses
See 1.7.6/RD.
4.5.7 Wiring terminals
See 1.7.7/RD.
4.5.8 Battery terminals
Terminals intended for connection to batteries shall indicate the polarity according to
IEC 60417 or be so constructed as to reduce the likelihood of improper connection.
4.5.9 Controls and indicators
See 1.7.8/RD.
4.5.10 Isolation of multiple power sources
See 1.7.9/RD.
4.5.11 IT power systems
See 1.7.10/RD.
62040-1-1  IEC:2004 – 29 –
4.5.12 Protection in building installation
If pluggable equipment type B or permanently connected equipment relies on the building
installation for the protection of internal wiring of the equipment, the equipment installation
instructions shall so state and shall also specify the necessary requirements for short-circuit
protection or overcurrent protection or, where necessary, for both (see 5.6.1).
If the protection against electric shock of the UPS (5.1) relies on residual current devices in
the building installation circuit and the design of the UPS is such that in any normal or
abnormal operating condition a fault current to earth with d.c. component is possible, the
installation instructions shall define the building residual current devices as type B (see IEC
60755) for three-phase UPS and as type A (IEC 61008-1 or IEC 61009-1) for single-phase
UPS.
NOTE Consideration should be given to national wiring rules, if any, regarding requirements for public networks
protection.
4.5.13 High leakage current
See 5.1/RD. In addition, the following provisions apply.
For UPS systems intended for use as pluggable equipment type B or fixed installations,
where the earth leakage currents of the UPS and connected loads sum in the primary UPS
protective earth conductor exceeds or is likely to exceed the limits of 5.1/RD under any mode
of operation, the unit shall carry a warning label as required by 5.1/RD, and the installation
manual shall define the connection method to the primary power source.
4.5.14 Thermostats and other regulating devices
See 1.7.11/RD.
4.5.15 Language
See 1.7.12/RD.
4.5.16 Durability of markings
See 1.7.13/RD.
4.5.17 Removable parts
See 1.7.14/RD.
4.5.18 Replaceable batteries
See 1.7.15/RD.
4.5.19 Operator access with a tool
See 1.7.16/RD.
62040-1-1  IEC:2004 – 31 –
4.5.20 Battery
External battery cabinets or battery compartments within the UPS shall be provided with the
following, clearly legible information in such a position as to be immediately seen by a
service person when servicing the UPS, in accordance with the requirements of 1.7.1/RD:
a) battery type (lead-acid, NiCd, etc.) and number of blocks or cells;
b) nominal voltage of total battery;
c) nominal capacity of total battery (optional);
d) warning label denoting an energy or electrical shock and chemical hazard and reference to
the maintenance handling and disposal requirements detailed in the following instructions.
Exception: Pluggable equipment type A UPS, supplied with integral batteries or with
separate battery cabinets, intended for location either under or over or alongside the UPS,
connected by plugs and sockets for operator installation, need only be fitted with the warning
label (see item d above) on the outside of the unit.
All other information shall be given in the users' instructions.
Instructions
a) Internally mounted battery:
– instructions shall carry sufficient information to enable the replacement of the battery
with a suitable recommended type;
– safety instructions to allow access by a service person shall be stated in the
installation/service handbook;
– if batteries are to be installed by a service person, instructions for interconnections
including terminal torques shall be provided.
The operator manual shall include the following instructions:
– Servicing of batteries should be performed or supervised by personnel
knowledgeable about batteries and required precautions.
– When replacing batteries, replace with the same type and number of batteries or
battery packs.
CAUTION: Do not dispose of batteries in a fire. The batteries may explode.
CAUTION: Do not open or mutilate batteries. Released electrolyte is harmful to the
skin and eyes. It may be toxic.
b) Externally mounted batteries:
– installation instructions shall state voltage, ampere-hour rating, charging regime and
method of protection required on installation to coordinate with UPS protective
devices, where the battery is not provided by the UPS manufacturer;
– instructions for the battery cells shall be provided by the battery manufacturer.
c) External battery cabinets:
External battery cabinet supplied with the UPS shall have adequate installation
instructions to define cable sizes for connection to the UPS if the cabling is not supplied
by the UPS manufacturer. Where the battery cells or blocks are not supplied pre-installed
and wired, installation instructions for the battery cells or blocks shall be provided by the
battery manufacturer, if not detailed in the UPS manufacturer's installation instructions.

62040-1-1  IEC:2004 – 33 –
4.5.21 Installation instructions
Adequate information shall be provided in the installation instructions as to the purpose and
connection of any signalling circuits, relay contacts, Emergency Power Off (EPO) circuits, etc.
Attention should be drawn as to the necessity of maintaining characteristics of any TNV,
SELV or ELV circuits when connected to other equipment.
Installation instructions shall carry sufficient information, including the basic internal circuit
configuration of the UPS, to emphasize its compatibility to power distribution systems.
Special attention shall be given to the compatibility with the relevant wiring rules and to
bypass circuits.
5 Fundamental design requirements
5.1 Protection against electric shock and energy hazards
The provisions of 2.1.1.2/RD, 2.1.1.4/RD, 2.1.1.5/RD, 2.1.1.6/RD, 2.1.1.7/RD apply together
with the following.
5.1.1 Operator access
The standard specifies two categories of requirements for protection against electric shock
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