IEC 62040-2:2016
(Main)Uninterruptible power systems (UPS) - Part 2: Electromagnetic compatibility (EMC) requirements
Uninterruptible power systems (UPS) - Part 2: Electromagnetic compatibility (EMC) requirements
IEC 62040-2:2016 is a type test product standard for electromagnetic compatibility (EMC) and applies to movable, stationary, fixed or built-in, pluggable and permanently connected UPS for use in low-voltage distribution systems with an environment being either residential, commercial, light industrial or industrial, which deliver output voltage with port voltages not exceeding 1 500 V DC or 1 000 V AC and which include an energy storage device. This edition includes the following significant technical changes with respect to the previous edition:
a) the inclusion of network port limits in Table 1, Table 2 and Annex C for the sake of consistency with other standards;
b) a change of quasi-peak limit for category C3 UPS in Table 2 for the sake of consistency with other standards;
c) a clarification in Table 4 about the performance criteria for immunity tests;
d) a revision of some test configurations in Annex A.
The contents of the Interpretation sheet 1 of June 2018 have been included in this copy.
Alimentations sans interruption (ASI) - Partie 2: Exigences pour la compatibilité électromagnétique (CEM)
L'IEC 62040-2:2016 est une norme de produit pour les essais de type en matière de compatibilité électromagnétique (CEM). Elle s'applique aux ASI mobiles, stationnaires, installées à poste fixe ou intégrées, enfichables et connectées en permanence, destinées à une utilisation dans les réseaux de distribution basse tension d'un environnement résidentiel, commercial, d'industrie légère ou industriel, qui fournissent une tension de sortie ne dépassant pas 1 000 V en courant alternatif ou 1 500 V en courant continu au niveau de l'accès, et qui incluent un dispositif de stockage d'énergie. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) l'intégration des limites pour les accès réseau de télécommunication dans le Tableau 1, le Tableau 2 et l'Annexe C, à des fins de cohérence avec d'autres normes;
b) une modification des limites quasi-crête pour les ASI de catégorie C3 dans le Tableau 2, à des fins de cohérence avec d'autres normes;
c) une clarification des critères de performance destinés aux essais d'immunité dans le Tableau 4;
d) une révision de certaines configurations d'essai dans l'Annexe A.
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IEC 62040-2 ®
Edition 3.0 2016-11
REDLINE VERSION
INTERNATIONAL
STANDARD
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Uninterruptible power systems (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
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IEC 62040-2 ®
Edition 3.0 2016-11
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Uninterruptible power systems (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220; 29.200; 33.100.10 ISBN 978-2-8322-3663-5
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 62040-2
Edition 3.0 2016-11
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 22H: Uninterruptible power
systems (UPS), of IEC technical committee 22: Power electronic systems and equipment.
The text of this interpretation sheet is based on the following documents:
FDIS Report on voting
22H/232/FDIS 22H/236/RVD
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
Interpretation of 5.3.2.4, Limits at the network ports
Introduction
Sub-clause 5.3.2.4 states that the network port limits applicable to UPS of category C1, C2
and C3 are located in Table 1, Table 2 and Annex C.
It was not clear whether 5.3.2.4 applies to network ports that originate and terminate within
the enclosure port of the UPS (i.e. to network ports connected exclusively to circuits or
devices forming an integral part of the UPS).
Interpretation
The network port limits in Table 1, Table 2 and Annex C apply only to network ports for
which connection to circuits or devices external to the enclosure port of the UPS is allowed.
This includes, without limitation, connection to PSTN, ISDN, xDSL and Ethernet networks.
The limits in Table 1, Table 2 and Annex C do not apply to network ports that originate and
terminate within the enclosure port of the UPS (i.e. to network ports connected exclusively
to circuits or devices forming an integral part of the UPS).
ICS 17.220; 29.200; 33.100.10
– 2 – IEC 62040-2:2016 RLV © IEC 2016
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 12
4 Environment .
4 UPS categories . 12
4.1 Category C1 UPS . 12
4.2 Category C2 UPS . 12
4.3 Category C3 UPS . 13
4.4 Category C4 UPS . 13
4.5 Categories and environment . 13
4.6 Documentation for the purchaser/user . 14
5 Emission. 14
5.1 General . 14
5.2 General test requirements . 14
5.3 General Measurement conditions requirements . 15
5.3.1 General . 15
5.3.2 Conducted emission . 15
5.3.3 Applicability .
5.3.3 Radiated emission . 18
6 Immunity. 18
6.1 General . 18
6.2 General requirements and performance criteria . 18
6.3 Basic immunity requirements – High-frequency disturbances . 19
6.3.1 Conditions General . 19
6.3.2 Equipment of Category C1 UPS . 19
6.3.3 Equipment of Category C2 and C3 UPS . 20
6.3 Immunity to low-frequency signals .
6.4 Immunity to power-frequency magnetic field.
6.4 Immunity to voltage dips, short interruptions and voltage variations . 22
Annex A (normative) Electromagnetic emission – Test methods . 23
A.1 General . 23
A.2 Measuring equipment . 23
A.2.1 Measuring instruments. 23
A.2.2 Artificial mains network (AMN) . 23
A.2.3 Voltage probe . 23
A.2.4 Antennas . 24
A.2.5 Common mode absorption device (CMAD) . 24
A.2.6 Asymmetric artificial network . 24
A.3 Test unit configuration . 24
A.4 Determination of maximum emission configurations . 25
A.5 Operation of the equipment under test . 26
A.6 Method of measurement of mains terminal interference disturbance voltage . 26
A.6.1 Measuring receivers . 26
A.6.2 Artificial mains network (AMN) . 26
A.6.3 Ground plane . 27
A.6.4 Equipment set-up for conducted emission measurements . 27
A.6.5 Conducted emission measurement . 28
A.7 Method of measurement at AC output ports (where applicable) . 28
A.8 Method of measurement of radiated emission . 29
A.8.1 General . 29
A.8.2 Measuring receivers . 29
A.8.3 Antennas . 29
A.9 Measurement site . 29
A.9.1 Test site . 29
A.9.2 Alternative test sites . 29
A.10 Equipment set-up for radiated emission tests . 29
A.10.1 General . 29
A.10.2 Radiated emission measurement . 30
A.10.3 Measurement in the presence of high ambient signals . 30
A.11 Measurement of radiated magnetic disturbances . 30
A.12 Measurement of network port disturbances . 30
Annex B (informative) Electromagnetic emission limits and measurement methods of
magnetic field – H field . 41
Annex C (informative normative) Electromagnetic emission – Limits of signal network
ports . 43
Annex D (normative) Electromagnetic immunity – Test methods . 44
D.1 General . 44
D.1.1 Object . 44
D.1.2 Test environment . 44
D.2 Electrostatic discharge (ESD) . 44
D.3 Immunity to radiated electromagnetic (EM) fields . 44
D.3.1 General . 44
D.3.2 Arrangement of wiring . 44
D.4 Immunity to fast transients . 44
D.5 Immunity to surges. 45
D.6 Immunity to low-frequency signals . 45
D.6.1 Power line harmonics and inter-harmonics . 45
D.6.2 Power line unbalance (three-phase UPS systems only) . 45
Annex E (informative) User installation testing . 47
Bibliography . 48
Figure 1 – Examples of ports .
Figure 1 – UPS ports . 10
Figure A.1 – Circuit for disturbance voltage measurements on mains supply or UPS
output . 31
Figure A.2 – Minimum alternative test site . 31
Figure A.3 – Set-up for measurement of conducted emission for table-top units using
voltage probe . 32
Figure A.4 – Set-up for measurement of conducted emission for table-top units using
AMN (alternative method) . 33
– 4 – IEC 62040-2:2016 RLV © IEC 2016
Figure A.5 – Test set-up for floor-standing units . 33
Figure A.6 – Test set-up for floor-standing units using AMN (alternative method) . 34
Figure A.7 – Test configuration for table-top equipment (conducted emission
measurement) . 35
Figure A.8 – Test configuration for table-top equipment (conducted emission
measurement) – Plan view . 36
Figure A.9 – Alternative test configuration for table-top equipment (conducted emission
measurement) – Plan view . 36
Figure A.10 – Test configuration for floor-standing equipment (conducted emission
measurement) . 37
Figure A.11 – Test configuration for table-top equipment (radiated emission
requirement) . 38
Figure A.12 – Test configuration for floor-standing equipment (radiated emission
measurement) . 39
Figure A.13 – Test configuration for top entry floor-standing equipment (radiated
emission measurement) . 40
Figure B.1 – Test set-up for measuring radiated disturbances . 41
Figure D.1 – Amplitude unbalance . 46
Figure D.2 – Phase unbalance . 46
Table 1 – Limits of mains terminal interference and network port disturbance voltage
for category C1 and category C2 UPS in the frequency range 0,15 MHz to 30 MHz . 16
Table 2 – Limits of mains terminal interference and network port disturbance voltage
for category C3 UPS in the frequency range 0,15 MHz to 30 MHz . 16
Table 3 – Limits of radiated emission in the frequency range 30 MHz to 1 000 MHz . 18
Table 4 – Performance criteria for immunity tests . 19
Table 5 – Minimum immunity requirements for category C1 UPS . 20
Table 6 – Minimum immunity requirements for category C2 and C3 UPS . 21
Table B.1 – UPS which has a rated output current less than or equal to 16 A . 42
Table B.2 – UPS which has a rated output current greater than 16 A . 42
Table C.1 – Limits of signal network ports for category C1 UPS . 43
Table C.2 – Limits of network ports for category C2 UPS . 43
Table C.3 – Limits of network ports for category C3 UPS . 43
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
FOREWORD
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This redline version of the official IEC Standard allows the user to identify the changes
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International Standard IEC 62040-2 has been prepared by subcommittee 22H: Uninterruptible
power systems (UPS), of IEC technical committee 22: Power electronic systems and
equipment.
– 6 – IEC 62040-2:2016 RLV © IEC 2016
This third edition cancels and replaces the second edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the inclusion of network port limits in Table 1, Table 2 and Annex C for the sake of
consistency with other standards;
b) a change of quasi-peak limit for category C3 UPS in Table 2 for the sake of consistency
with other standards;
c) a clarification in Table 4 about the performance criteria for immunity tests;
d) a revision of some test configurations in Annex A.
The text of this standard is based on the following documents:
FDIS Report on voting
22H/210/FDIS 22H/212/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, 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.
A list of all parts in the IEC 62040 series, published under the general title Uninterruptible
power systems (UPS), can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
reconfirmed,
withdrawn,
replaced by a revised edition, or
amended.
The contents of the Interpretation sheet of June 2018 have been included in this copy.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
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UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
1 Scope
This part of IEC 62040 applies to UPS units intended to be installed
– as a unit or in UPS systems comprising a number of interconnected UPS and associated
control/switchgear forming a single power system; and
– in any operator accessible area or in separated electrical locations, connected to low-
voltage supply networks for either industrial or residential, commercial and light industrial
environments.
This part of IEC 62040 is intended as a product standard allowing the EMC conformity
assessment of products of categories C1, C2 and C3 as defined in this part of IEC 62040,
before placing them on the market.
Equipment of category 4 is treated as a fixed installation. Checking is generally done after
installation in its final place of use. Sometimes partial checking may be done before. See
Annex E
The requirements have been selected so as to ensure an adequate level of electromagnetic
compatibility (EMC) for UPS at public and industrial locations. These levels cannot, however,
cover extreme cases, which may occur in any location but with extremely low probability of
occurrence.
This part of IEC 62040 takes into account the differing test conditions necessary to
encompass the range of physical sizes and power ratings of UPS.
A UPS unit or system shall meet the relevant requirements of this part of IEC 62040 as a
stand-alone product. EMC phenomena produced by any customers' load connected to the
output of the UPS equipment shall not be taken into account.
Special installation environments are not covered, nor are fault conditions of UPS taken into
account.
This part of IEC 62040 does not cover d.c. supplied electronic ballast or UPS based on
rotating machines.
This part of IEC 62040 states:
– EMC requirements;
– test methods;
– minimum performance levels.
This part of IEC 62040 is a type test product standard for electromagnetic compatibility (EMC)
and applies to movable, stationary, fixed or built-in, pluggable and permanently connected
UPS for use in low-voltage distribution systems with an environment being either residential,
commercial, light industrial or industrial, which deliver output voltage with port voltages not
exceeding 1 500 V DC or 1 000 V AC and which include an energy storage device.
Subject to installing, operating and maintaining the UPS in the manner prescribed by the
manufacturer, this standard defines emission limits, immunity levels, test methods and
performance criteria for a complete UPS to comply with the essential EMC requirements
– 8 – IEC 62040-2:2016 RLV © IEC 2016
necessary to avoid the UPS interfering with other apparatus, e.g. radio receivers, and to avoid
the UPS being affected by external phenomena.
This standard does not address EMC phenomena produced by loads connected to the UPS or
situations created by any apparatus external to the UPS other than as described in the
immunity requirements.
This standard is harmonized with applicable IEC standards for electromagnetic emission limits
and immunity levels. It contains additional requirements applicable to UPS.
This standard does not cover:
a) low-voltage DC power supply devices covered by IEC 61204 standards;
b) systems wherein the output voltage is derived from a rotating machine.
NOTE 1 UPS generally connect to their energy storage device through a DC link. A chemical battery is an
example of an energy storage device. Alternative devices can be suitable, and as such, where “battery” appears in
the text of this standard, this can be understood as “energy storage device”.
NOTE 2 This type test-based product standard allows EMC conformity assessment of UPS included in one of
categories C1, C2 and C3 before placing them on the market. It also provides guidance for conformity assessment
of UPS included in category C4 (see Clause 4).
NOTE 3 The differing test conditions necessary to encompass the range of physical sizes and power ratings of a
complete UPS are taken into account. A complete UPS can consist of one or more interconnected units. For UPS
configuration details refer to IEC 62040-3:2011, Annex A.
NOTE 4 The requirements have been selected so as to permit an adequate level of EMC for UPS installed in
residential, commercial, light industrial and industrial locations. The requirements are not always sufficient to cover
situations with low probability of occurrence including UPS faults.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 60050-161:1990, International Electrotechnical Vocabulary (IEV) – Chapter 161:
Electromagnetic compatibility
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 61000-3-2:2000 2014, Electromagnetic compatibility (EMC) – Part 3-2: Limits − Limits for
harmonic current emissions (equipment input current ≤16 A per phase)
IEC 61000-3-12:2011, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current > 16 A and ≤ 75 A per phase
IEC 61000-4-1:2000, Electromagnetic compatibility (EMC) – Part 4-1: Testing and measure-
ment techniques − Overview of IEC 61000-4 series
IEC 61000-4-2:1995 2008, Electromagnetic compatibility (EMC) − Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2002 2006, Electromagnetic compatibility (EMC) − Part 4-3: Testing and
measurement techniques − Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:2004 2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques − Electrical fast transient/burst immunity test
IEC 61000-4-5:1995 2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and
measurement techniques – Surge immunity test
IEC 61000-4-6:2003 2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances induced by radio-frequency
fields
IEC 61000-4-8:1993 2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and
measurement techniques – Power frequency magnetic field immunity test
IEC 62040-3:1999 2011, Uninterruptible power systems (UPS) – Part 3: Method of specifying
the performance and test requirements
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 16-1-1:2003 2015, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 1-1: Radio disturbance and immunity measuring apparatus −
Measuring apparatus
CISPR 16-1-2:2003 2014, Specification for radio disturbance and immunity measuring
apparatus and methods – Part 1-2: Radio disturbance and immunity measuring apparatus −
Ancillary equipment – Coupling devices for conducted disturbance measurements
CISPR 16-1-4:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Antennas
and test sites for radiated disturbance measurements
CISPR 16-1-4:2010/AMD1:2012
CISPR 16-2-1:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
CISPR 16-2-3:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-2-3:2010/AMD1:2010
CISPR 16-2-3:2010/AMD2:2014
CISPR 22:2005 2008, Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-161 related
to EMC and to relevant phenomena IEC 62040-3:2011 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
– 10 – IEC 62040-2:2016 RLV © IEC 2016
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
port
particular interface of the UPS with the external electromagnetic environment as shown in
Figure 1
AC output
AC input power port
power port
Power
converter(s)
Dedicated
Earth port
energy
DC interface
storage
device
e.g. battery
Network port
Non-dedicated
energy storage
device
DC port
e.g. a battery
shared with
equipment other
than the UPS
= Enclosure port
= Uninterruptible Power System
IEC
Figure 1 – UPS ports
3.1.2
DC interface
dedicated connection between the power converter and an energy storage device that is
exclusively used by the UPS
Note 1 to entry: The interface to an energy storage device intended for exclusive use of the UPS is not a port
because this device is included in the UPS. The dedicated energy storage device shown in Figure 1 is connected
through a DC interface.
3.1.3
DC port
connection from the power converter to an energy storage device that is not exclusively used
by the UPS
Note 1 to entry: The non-dedicated energy storage device is connected through a DC port.
3.1.4
enclosure port
physical boundary of the UPS equipment under test (EUT) which electromagnetic fields may
can radiate through or impinge on
Note 1 to entry: In Figure 1, the enclosure port represented by the dotted line around the power converter(s) and
the dedicated energy storage device does not imply the existence of any shielding.
Enclosure port
AC output power port
AC input power port
UPS
Signal/control port
Earth port
DC power port (battery)
IEC 1655/05
Figure 1 – Examples of ports
3.1.5
network port
signal, control or communication ports intended for the interconnection of components of an
uninterruptible power system (UPS), or between a UPS and local associated equipment and
used in accordance with relevant functional specifications for the purpose of control and/or
monitoring of the UPS system and/or control of the associated equipment in accordance with
the instruction manual
Note 1 to entry: The maximum length of cable connected to the network port is an example of relevant functional
specifications.
3.1.6
first environment
environment that includes residential, commercial and light industrial premises directly
connected, without intermediate transformers, to a public low-voltage mains supply
3.1.7
second environment
environment that includes all commercial, light industry and industrial locations other than
those included in the first environment
Note 1 to entry: A building, or part of it, when supplied from a dedicated transformer or generator is an example
of second environment.
3.1.8
category C1 UPS
UPS intended for use without any restriction in the first environment
Note 1 to entry: Such UPS are suitable for use in residential locations.
3.1.9
category C2 UPS
UPS intended for use without any restriction in the second environment
Note 1 to entry: Such UPS can also be used in the first environment under certain conditions.
3.1.10
category C3 UPS
UPS with an output current exceeding 16 A and intended for use in the second environment
with certain restrictions
– 12 – IEC 62040-2:2016 RLV © IEC 2016
3.1.11
category C4 UPS
UPS that cannot be classified within any of the C1, C2 or C3 categories and intended for use
in environments subject to particular requirements
3.2 Abbreviated terms
AAN asymmetric artificial network
NOTE 1 The terms impedance stabilization network (ISN) and AAN are used interchangeably.
AE auxiliary equipment
AMN artificial mains network
NOTE 2 The terms line impedance stabilization network (LISN) and AMN are used interchangeably.
CMAD common mode absorption device
EUT equipment under test
RF radio frequency
4 Environment
The following examples of environment cover the majority of UPS installations.
a) First environment: environment that includes residential, commercial and light industrial
premises directly connected without intermediate transformers to a public low-voltage
mains supply.
b) Second environment: environment that includes all commercial, light industry and
industrial establishments other than those directly connected to a low-voltage mains that
supplies buildings used for residential purposes.
4 UPS categories
4.1 Category C1 UPS
This category includes UPS intended for use without any restriction in the first environment.
Such UPS are suitable for use in residential establishments.
Category C1 UPS shall meet comply with category C1 requirements for emission limits (see
Clause 5) and withstand the for immunity requirements of Table 5 (see Clause 6).
4.2 Category C2 UPS
This category includes UPS with an output current not exceeding 16 A and intended for use
without any restriction in the second environment. Such UPS may also be used in the first
environment when connected the effect of the warning notice below is considered.
– through industrial plugs and sockets or
– through national plugs and sockets or
– permanently.
Category C2 UPS shall meet comply with category C2 requirements for emission limits (see
Clause 5) and withstand the for immunity requirements of Table 6 (see Clause 6).
The following wording warning shall be included in the instructions for user manual.
WARNING: This is a category C2 UPS product. In a residential environment, this product
may cause radio interference, in which case the user may be required to take additional
measures.
NOTE Such additional measures can require the services of a person or organization skilled with respect to EMC
aspects.
4.3 Category C3 UPS
This category includes UPS with an output current exceeding 16 A and intended for use in the
second environment with the following restrictions:
a) the UPS shall be installed and commissioned by a professional person or organization
that is skilled with respect to EMC aspects;
b) the UPS location shall be physically separated from other buildings classified as first
environment by a distance greater than 30 m or by a structure which acts as a barrier to
radiated phenomena providing equivalent attenuation; and
c) the installation shall be supplied through a dedicated transformer or generator or through
a device providing equivalent attenuation.
Such UPS are suitable for use in commercial or industrial installations having a minimum
boundary of 30 m from other buildings classified as first environment.
Category C3 UPS shall meet comply with category C3 requirements for emission limits (see
Clause 5) and withstand the for immunity requirements of Table 6 (see Clause 6).
The following wording warning shall be included in the instructions for user manual.
WARNING: This is a product for commercial and industrial application in the second
environment − installation restrictions or additional measures may be needed to prevent
disturbances.
4.4 Category C4 UPS
This category includes UPS that cannot be classified within any of the C1, C2 or C3
categories intended for use in complex environments subject to an agreement between
supplier and customer regarding applicable emission and immunity levels particular
requirements.
Such UPS shall meet the specific emission and immunity levels applicable for the installation.
A category C4 UPS is not limited by current ratings.
NOTE Conformity assessment of a C4 UPS generally consists of a technical evaluation of the effect of combining
complying UPS variants and subassemblies, and of a final site test to verify compliance with requirements that
cannot be readily verified by technical evaluation. For details regarding site testing refer to Annex E.
4.5 Categories and environment
If the environment has been determined as the first environment, a category C1 or C2 UPS
should be used.
If the environment has been determined as the second environment, a category C2 or C3
UPS should be used.
If the environment is not covered exclusively either by the first or second environment, a
category C4 UPS should be used.
From the emission point of view, a UPS with a lower emission category, such as C1, can
always be used instead of one with a higher emission category, such as C3.
– 14 – IEC 62040-2:2016 RLV © IEC 2016
Emission categories are independent of immunity. For example, a statement that a UPS has
emission category C1 does not imply that the immunity is only suitable for the first
environment.
4.6 Documentation for the purchaser/user
a) The purchaser/user shall be informed if special measures have to be taken to achieve
compliance, for example, the use of shielded or special cables. Any restriction on the
length of the a.c. output cables shall also be indicated.
b) Notwithstanding that the scope of supply of the UPS shall comply with any local
regulation, documentation shall be available to the purchaser/user upon request. A list of
auxiliary accessories, together with the UPS complying with the emission requirements,
shall be made available.
For EMC purposes, the following shall be included in the user documentation:
a) any special measures to be taken to achieve compliance, for example, the segregation of
cables, the use of shielded or special cables and any restriction on the length of cables
connected to the AC output and/or to the energy storage device;
b) upon request, a list of EMC-compatible UPS accessories;
c) warning notice for category C1 UPS as described in 6.
...
IEC 62040-2 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
Alimentations sans interruption (ASI) –
Partie 2: Exigences pour la compatibilité électromagnétique (CEM)
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IEC 62040-2 ®
Edition 3.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Uninterruptible power systems (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
Alimentations sans interruption (ASI) –
Partie 2: Exigences pour la compatibilité électromagnétique (CEM)
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220; 29.200; 33.100.10 ISBN 978-2-8322-3753-3
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
IEC 62040-2
Edition 3.0 2016-11
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
INTERPRETATION SHEET 1
This interpretation sheet has been prepared by subcommittee 22H: Uninterruptible power
systems (UPS), of IEC technical committee 22: Power electronic systems and equipment.
The text of this interpretation sheet is based on the following documents:
FDIS Report on voting
22H/232/FDIS 22H/236/RVD
Full information on the voting for the approval of this interpretation sheet can be found in the
report on voting indicated in the above table.
___________
Interpretation of 5.3.2.4, Limits at the network ports
Introduction
Sub-clause 5.3.2.4 states that the network port limits applicable to UPS of category C1, C2
and C3 are located in Table 1, Table 2 and Annex C.
It was not clear whether 5.3.2.4 applies to network ports that originate and terminate within
the enclosure port of the UPS (i.e. to network ports connected exclusively to circuits or
devices forming an integral part of the UPS).
Interpretation
The network port limits in Table 1, Table 2 and Annex C apply only to network ports for
which connection to circuits or devices external to the enclosure port of the UPS is allowed.
This includes, without limitation, connection to PSTN, ISDN, xDSL and Ethernet networks.
The limits in Table 1, Table 2 and Annex C do not apply to network ports that originate and
terminate within the enclosure port of the UPS (i.e. to network ports connected exclusively
to circuits or devices forming an integral part of the UPS).
ICS 17.220; 29.200; 33.100.10
– 2 – IEC 62040-2:2016 © IEC 2016
CONTENTS
FOREWORD . 5
1 Scope . 7
2 Normative references . 7
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 11
4 UPS categories . 11
4.1 Category C1 UPS. 11
4.2 Category C2 UPS. 11
4.3 Category C3 UPS. 11
4.4 Category C4 UPS. 12
4.5 Categories and environment . 12
4.6 Documentation . 12
5 Emission. 12
5.1 General . 12
5.2 General test requirements . 13
5.3 Measurement requirements . 13
5.3.1 General . 13
5.3.2 Conducted emission . 13
5.3.3 Radiated emission . 15
6 Immunity. 16
6.1 General . 16
6.2 General requirements and performance criteria . 16
6.3 Basic immunity requirements . 17
6.3.1 General . 17
6.3.2 Category C1 UPS . 17
6.3.3 Category C2 and C3 UPS . 18
6.4 Immunity to voltage dips, short interruptions and voltage variations . 19
Annex A (normative) Electromagnetic emission – Test methods . 20
A.1 General . 20
A.2 Measuring equipment . 20
A.2.1 Measuring instruments. 20
A.2.2 Artificial mains network (AMN) . 20
A.2.3 Voltage probe . 20
A.2.4 Antennas . 21
A.2.5 Common mode absorption device (CMAD) . 21
A.2.6 Asymmetric artificial network . 21
A.3 Test unit configuration . 21
A.4 Determination of maximum emission configurations . 22
A.5 Operation of the equipment under test . 22
A.6 Method of measurement of mains terminal disturbance voltage . 23
A.6.1 Measuring receivers . 23
A.6.2 Artificial mains network (AMN) . 23
A.6.3 Ground plane . 24
A.6.4 Equipment set-up for conducted emission measurements . 24
A.6.5 Conducted emission measurement . 24
A.7 Method of measurement at AC output ports (where applicable) . 25
A.8 Method of measurement of radiated emission . 25
A.8.1 General . 25
A.8.2 Measuring receivers . 25
A.8.3 Antennas . 26
A.9 Measurement site . 26
A.9.1 Test site . 26
A.9.2 Alternative test sites . 26
A.10 Equipment set-up for radiated emission tests . 26
A.10.1 General . 26
A.10.2 Radiated emission measurement . 27
A.10.3 Measurement in the presence of high ambient signals . 27
A.11 Measurement of radiated magnetic disturbances . 27
A.12 Measurement of network port disturbances . 27
Annex B (informative) Electromagnetic emission limits and measurement methods of
magnetic field – H field . 38
Annex C (normative) Electromagnetic emission – Limits of network ports . 40
Annex D (normative) Electromagnetic immunity – Test methods . 41
D.1 General . 41
D.1.1 Object . 41
D.1.2 Test environment . 41
D.2 Electrostatic discharge (ESD) . 41
D.3 Immunity to radiated electromagnetic (EM) fields . 41
D.3.1 General . 41
D.3.2 Arrangement of wiring . 41
D.4 Immunity to fast transients . 41
D.5 Immunity to surges. 42
D.6 Immunity to low-frequency signals . 42
D.6.1 Power line harmonics and inter-harmonics . 42
D.6.2 Power line unbalance (three-phase UPS systems only) . 42
Annex E (informative) User installation testing . 44
Bibliography . 45
Figure 1 – UPS ports . 9
Figure A.1 – Circuit for disturbance voltage measurements on mains supply or UPS
output . 28
Figure A.2 – Minimum alternative test site . 28
Figure A.3 – Set-up for measurement of conducted emission for table-top units using
voltage probe . 29
Figure A.4 – Set-up for measurement of conducted emission for table-top units using
AMN (alternative method) . 30
Figure A.5 – Test set-up for floor-standing units . 30
Figure A.6 – Test set-up for floor-standing units using AMN (alternative method) . 31
Figure A.7 – Test configuration for table-top equipment (conducted emission
measurement) . 32
Figure A.8 – Test configuration for table-top equipment (conducted emission
measurement) – Plan view . 33
– 4 – IEC 62040-2:2016 © IEC 2016
Figure A.9 – Alternative test configuration for table-top equipment (conducted emission
measurement) – Plan view . 33
Figure A.10 – Test configuration for floor-standing equipment (conducted emission
measurement) . 34
Figure A.11 – Test configuration for table-top equipment (radiated emission
requirement) . 35
Figure A.12 – Test configuration for floor-standing equipment (radiated emission
measurement) . 36
Figure A.13 – Test configuration for top entry floor-standing equipment (radiated
emission measurement) . 37
Figure B.1 – Test set-up for measuring radiated disturbances . 38
Figure D.1 – Amplitude unbalance . 43
Figure D.2 – Phase unbalance . 43
Table 1 – Limits of mains terminal and network port disturbance voltage for category
C1 and category C2 UPS in the frequency range 0,15 MHz to 30 MHz . 14
Table 2 – Limits of mains terminal and network port disturbance voltage for category
C3 UPS in the frequency range 0,15 MHz to 30 MHz . 14
Table 3 – Limits of radiated emission in the frequency range 30 MHz to 1 000 MHz . 15
Table 4 – Performance criteria for immunity tests . 16
Table 5 – Minimum immunity requirements for category C1 UPS . 17
Table 6 – Minimum immunity requirements for category C2 and C3 UPS . 18
Table B.1 – UPS which has a rated output current less than or equal to 16 A . 38
Table B.2 – UPS which has a rated output current greater than 16 A . 39
Table C.1 – Limits of network ports for category C1 UPS . 40
Table C.2 – Limits of network ports for category C2 UPS . 40
Table C.3 – Limits of network ports for category C3 UPS . 40
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) 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,
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agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
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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 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 62040-2 has been prepared by subcommittee 22H: Uninterruptible
power systems (UPS), of IEC technical committee 22: Power electronic systems and
equipment.
This third edition cancels and replaces the second edition published in 2005. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the inclusion of network port limits in Table 1, Table 2 and Annex C for the sake of
consistency with other standards;
b) a change of quasi-peak limit for category C3 UPS in Table 2 for the sake of consistency
with other standards;
c) a clarification in Table 4 about the performance criteria for immunity tests;
d) a revision of some test configurations in Annex A.
– 6 – IEC 62040-2:2016 © IEC 2016
The text of this standard is based on the following documents:
FDIS Report on voting
22H/210/FDIS 22H/212/RVD
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
In this document, 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.
A list of all parts in the IEC 62040 series, published under the general title Uninterruptible
power systems (UPS), can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
reconfirmed,
withdrawn,
replaced by a revised edition, or
amended.
The contents of the Interpretation sheet of June 2018 have been included in this copy.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
UNINTERRUPTIBLE POWER SYSTEMS (UPS) –
Part 2: Electromagnetic compatibility (EMC) requirements
1 Scope
This part of IEC 62040 is a type test product standard for electromagnetic compatibility (EMC)
and applies to movable, stationary, fixed or built-in, pluggable and permanently connected
UPS for use in low-voltage distribution systems with an environment being either residential,
commercial, light industrial or industrial, which deliver output voltage with port voltages not
exceeding 1 500 V DC or 1 000 V AC and which include an energy storage device.
Subject to installing, operating and maintaining the UPS in the manner prescribed by the
manufacturer, this standard defines emission limits, immunity levels, test methods and
performance criteria for a complete UPS to comply with the essential EMC requirements
necessary to avoid the UPS interfering with other apparatus, e.g. radio receivers, and to avoid
the UPS being affected by external phenomena.
This standard does not address EMC phenomena produced by loads connected to the UPS or
situations created by any apparatus external to the UPS other than as described in the
immunity requirements.
This standard is harmonized with applicable IEC standards for electromagnetic emission limits
and immunity levels. It contains additional requirements applicable to UPS.
This standard does not cover:
a) low-voltage DC power supply devices covered by IEC 61204 standards;
b) systems wherein the output voltage is derived from a rotating machine.
NOTE 1 UPS generally connect to their energy storage device through a DC link. A chemical battery is an
example of an energy storage device. Alternative devices can be suitable, and as such, where “battery” appears in
the text of this standard, this can be understood as “energy storage device”.
NOTE 2 This type test-based product standard allows EMC conformity assessment of UPS included in one of
categories C1, C2 and C3 before placing them on the market. It also provides guidance for conformity assessment
of UPS included in category C4 (see Clause 4).
NOTE 3 The differing test conditions necessary to encompass the range of physical sizes and power ratings of a
complete UPS are taken into account. A complete UPS can consist of one or more interconnected units. For UPS
configuration details refer to IEC 62040-3:2011, Annex A.
NOTE 4 The requirements have been selected so as to permit an adequate level of EMC for UPS installed in
residential, commercial, light industrial and industrial locations. The requirements are not always sufficient to cover
situations with low probability of occurrence including UPS faults.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements 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 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
– 8 – IEC 62040-2:2016 © IEC 2016
IEC 61000-3-2:2014, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤ 16 A per phase)
IEC 61000-3-12:2011, Electromagnetic compatibility (EMC) – Part 3-12: Limits – Limits for
harmonic currents produced by equipment connected to public low-voltage systems with input
current > 16 A and ≤ 75 A per phase
IEC 61000-4-2:2008, Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
IEC 61000-4-3:2006, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measure-
ment techniques − Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4:2012, Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5:2014, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measure-
ment techniques – Surge immunity test
IEC 61000-4-6:2013, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measure-
ment techniques – Immunity to conducted disturbances induced by radio-frequency fields
IEC 61000-4-8:2009, Electromagnetic compatibility (EMC) – Part 4-8: Testing and measure-
ment techniques – Power frequency magnetic field immunity test
IEC 62040-3:2011, Uninterruptible power systems (UPS) – Part 3: Method of specifying the
performance and test requirements
CISPR 11:2015, Industrial, scientific and medical equipment – Radio-frequency disturbance
characteristics – Limits and methods of measurement
CISPR 16-1-1:2015, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-1: Radio disturbance and immunity measuring apparatus − Measuring
apparatus
CISPR 16-1-2:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-2: Radio disturbance and immunity measuring apparatus – Coupling
devices for conducted disturbance measurements
CISPR 16-1-4:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 1-4: Radio disturbance and immunity measuring apparatus – Antennas
and test sites for radiated disturbance measurements
CISPR 16-1-4:2010/AMD1:2012
CISPR 16-2-1:2014, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-1: Methods of measurement of disturbances and immunity – Conducted
disturbance measurements
CISPR 16-2-3:2010, Specification for radio disturbance and immunity measuring apparatus
and methods – Part 2-3: Methods of measurement of disturbances and immunity – Radiated
disturbance measurements
CISPR 16-2-3:2010/AMD1:2010
CISPR 16-2-3:2010/AMD2:2014
CISPR 22:2008, Information technology equipment – Radio disturbance characteristics –
Limits and methods of measurement
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 62040-3:2011 and
the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
port
particular interface of the UPS with the external electromagnetic environment as shown in
Figure 1
AC output
AC input power port
power port
Power
converter(s)
Dedicated
Earth port
energy
DC interface
storage
device
e.g. battery
Network port
Non-dedicated
energy storage
device
DC port
e.g. a battery
shared with
equipment other
than the UPS
= Enclosure port
= Uninterruptible Power System
IEC
Figure 1 – UPS ports
3.1.2
DC interface
dedicated connection between the power converter and an energy storage device that is
exclusively used by the UPS
Note 1 to entry: The interface to an energy storage device intended for exclusive use of the UPS is not a port
because this device is included in the UPS. The dedicated energy storage device shown in Figure 1 is connected
through a DC interface.
– 10 – IEC 62040-2:2016 © IEC 2016
3.1.3
DC port
connection from the power converter to an energy storage device that is not exclusively used
by the UPS
Note 1 to entry: The non-dedicated energy storage device is connected through a DC port.
3.1.4
enclosure port
physical boundary of the equipment under test (EUT) which electromagnetic fields can radiate
through or impinge on
Note 1 to entry: In Figure 1, the enclosure port represented by the dotted line around the power converter(s) and
the dedicated energy storage device does not imply the existence of any shielding.
3.1.5
network port
signal, control or communication ports intended for the interconnection of components of an
uninterruptible power system (UPS), or between a UPS and local associated equipment and
used in accordance with relevant functional specifications for the purpose of control and/or
monitoring of the UPS system and/or control of the associated equipment in accordance with
the instruction manual
Note 1 to entry: The maximum length of cable connected to the network port is an example of relevant functional
specifications.
3.1.6
first environment
environment that includes residential, commercial and light industrial premises directly
connected, without intermediate transformers, to a public low-voltage mains supply
3.1.7
second environment
environment that includes all commercial, light industry and industrial locations other than
those included in the first environment
Note 1 to entry: A building, or part of it, when supplied from a dedicated transformer or generator is an example
of second environment.
3.1.8
category C1 UPS
UPS intended for use without any restriction in the first environment
Note 1 to entry: Such UPS are suitable for use in residential locations.
3.1.9
category C2 UPS
UPS intended for use without any restriction in the second environment
Note 1 to entry: Such UPS can also be used in the first environment under certain conditions.
3.1.10
category C3 UPS
UPS with an output current exceeding 16 A and intended for use in the second environment
with certain restrictions
3.1.11
category C4 UPS
UPS that cannot be classified within any of the C1, C2 or C3 categories and intended for use
in environments subject to particular requirements
3.2 Abbreviated terms
AAN asymmetric artificial network
NOTE 1 The terms impedance stabilization network (ISN) and AAN are used interchangeably.
AE auxiliary equipment
AMN artificial mains network
NOTE 2 The terms line impedance stabilization network (LISN) and AMN are used interchangeably.
CMAD common mode absorption device
EUT equipment under test
RF radio frequency
4 UPS categories
4.1 Category C1 UPS
This category includes UPS intended for use without any restriction in the first environment.
Category C1 UPS shall comply with category C1 requirements for emission limits (see
Clause 5) and for immunity (see Clause 6).
4.2 Category C2 UPS
This category includes UPS intended for use without any restriction in the second
environment. Such UPS may also be used in the first environment when the effect of the
warning notice below is considered.
Category C2 UPS shall comply with category C2 requirements for emission limits (see
Clause 5) and for immunity (see Clause 6).
The following warning shall be included in the user manual.
WARNING: This is a category C2 UPS product. In a residential environment, this product
may cause radio interference, in which case the user may be required to take additional
measures.
NOTE Such additional measures can require the services of a person or organization skilled with respect to EMC
aspects.
4.3 Category C3 UPS
This category includes UPS with an output current exceeding 16 A and intended for use in the
second environment with the following restrictions:
a) the UPS shall be installed and commissioned by a professional person or organization
that is skilled with respect to EMC aspects;
b) the UPS location shall be physically separated from other buildings classified as first
environment by a distance greater than 30 m or by a structure which acts as a barrier to
radiated phenomena providing equivalent attenuation; and
c) the installation shall be supplied through a dedicated transformer or generator or through
a device providing equivalent attenuation.
Category C3 UPS shall comply with category C3 requirements for emission limits (see
Clause 5) and for immunity (see Clause 6).
The following warning shall be included in the user manual.
– 12 – IEC 62040-2:2016 © IEC 2016
WARNING: This is a product for commercial and industrial application in the second
environment – installation restrictions or additional measures may be needed to prevent
disturbances.
4.4 Category C4 UPS
This category includes UPS that cannot be classified within any of the C1, C2 or C3
categories and intended for use in environments subject to particular requirements.
Such UPS shall meet the specific emission and immunity levels applicable for the installation.
A category C4 UPS is not limited by current ratings.
NOTE Conformity assessment of a C4 UPS generally consists of a technical evaluation of the effect of combining
complying UPS variants and subassemblies, and of a final site test to verify compliance with requirements that
cannot be readily verified by technical evaluation. For details regarding site testing refer to Annex E.
4.5 Categories and environment
If the environment has been determined as the first environment, a category C1 or C2 UPS
should be used.
If the environment has been determined as the second environment, a category C2 or C3
UPS should be used.
If the environment is not covered exclusively either by the first or second environment, a
category C4 UPS should be used.
From the emission point of view, a UPS with a lower emission category, such as C1, can
always be used instead of one with a higher emission category, such as C3.
Emission categories are independent of immunity. For example, a statement that a UPS has
emission category C1 does not imply that the immunity is only suitable for the first
environment.
4.6 Documentation
For EMC purposes, the following shall be included in the user documentation:
a) any special measures to be taken to achieve compliance, for example, the segregation of
cables, the use of shielded or special cables and any restriction on the length of cables
connected to the AC output and/or to the energy storage device;
b) upon request, a list of EMC-compatible UPS accessories;
c) warning notice for category C1 UPS as described in 6.3.2;
d) warning notice for category C2 and category C3 UPS as applicable and as described in
4.2 and 4.3.
5 Emission
5.1 General
The applicable emission limits for each UPS category are specified in 5.3.
Emissions in the frequency range up to 1,0 GHz are covered.
The emission requirements have been selected so as to ensure that disturbances generated
by UPS operating normally do not reach a level which could prevent other apparatus from
operating as intended.
NOTE 1 There is a possibility that the limits in this standard do not fully provide protection against interference to
radio and television reception when the UPS is used closer than 10 m to the receiving antenna for category C1 or
C2 UPS and 30 m for category C3 UPS.
NOTE 2 In special cases, for instance when highly susceptible apparatus is being used in proximity, additional
mitigation measures can be employed to reduce the electromagnetic emission further below the specified levels.
5.2 General test requirements
The UPS emission tests shall be performed under the following conditions:
a) rated input voltage;
b) normal mode(s) and stored energy mode of operation;
c) resistive load that results in the highest disturbance level.
Test requirements are specified for each port considered. Refer to Annex A for test
methodology.
5.3 Measurement requirements
5.3.1 General
The emission of all ports shall be verified as follows.
If the UPS can be connected to auxiliary accessories, then the UPS shall be tested while
connected to the minimum configuration including auxiliary and communication accessories
necessary to exercise all such ports, or connected to an equivalent terminating impedance.
The configuration and mode of operation during measurement shall be precisely noted in the
test report. Refer to Annex A for test set-up and measurement criteria. For in situ or user
installation testing, see Annex E.
5.3.2 Conducted emission
5.3.2.1 Ports and limits
For UPS with additional mains terminals (ports) for the connection of separate supplies for
static by-pass and/or maintenance bypass ci
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