IEC 61000-3-12:2011/AMD1:2021

IEC 61000-3-12 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
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
Compatibilité électromagnétique (CEM) –
Partie 3-12: Limites – Limites pour les courants harmoniques produits par
les appareils connectés aux réseaux publics basse tension ayant un courant
appelé >16 A et ≤75 A par phase

IEC 61000-3-12:2011-05/AMD1:2021-06(en-fr)

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IEC 61000-3-12 ®
Edition 2.0 2021-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
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
Compatibilité électromagnétique (CEM) –

Partie 3-12: Limites – Limites pour les courants harmoniques produits par

les appareils connectés aux réseaux publics basse tension ayant un courant

appelé >16 A et ≤75 A par phase

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 33.100.10 ISBN 978-2-8322-9854-1

– 2 – IEC 61000-3-12:2011/AMD1:2021
© IEC 2021
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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

AMENDMENT 1
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC Publication(s)”). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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6) All users should ensure that they have the latest edition of this publication.
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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 document may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to IEC 61000-3-12:2011 has been prepared by subcommittee 77A: EMC – Low
frequency phenomena, of IEC technical committee 77: Electromagnetic compatibility.
The text of this Amendment is based on the following documents:
CDV Report on voting
77A/1042/CDV 77A/1074/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this Amendment is English.

© IEC 2021
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/standardsdev/publications/.
A list of all parts in the IEC 61000 series, published under the general title Electromagnetic
compatibility (EMC), 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 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.
– 4 – IEC 61000-3-12:2011/AMD1:2021
© IEC 2021
1 Scope
Replace, in the first paragraph, “a.c.” with “AC”.
In Note 2, replace "and future IEC/TR 61000-3-14" with "and IEC/TR 61000-3-14".

2 Normative references
Replace IEC 61000-3-2 with the following:
IEC 61000-3-2:2018, Electromagnetic compatibility (EMC) – Part 3-2: Limits – Limits for
harmonic current emissions (equipment input current ≤16 A per phase)
IEC 61000-3-2:2018/AMD1:2020
3 Terms and definitions
Replace the existing text of the first paragraph with the following:
For the purposes of this document, the definitions given in IEC 60050-161 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
3.6
three-phase equipment
Replace, in definition 3.6, the existing Note 2 with the following:
NOTE 2 Equipment intended to be connected to all three phases and to the neutral and where the neutral conductor
is used as a current-carrying conductor, is considered as three separate single-phase items or as hybrid equipment.

5.2 Limits for emission
Replace the existing text of the ninth and tenth paragraphs with the following:
Table 4 may be used with balanced three-phase equipment if any one of the following conditions
is met:
th th
a) The 5 and 7 harmonic currents are each less than 5 % of the reference current during
the whole test observation period.
NOTE 4 This condition is normally fulfilled by 12-pulse pieces of equipment.
th
b) The design of the piece of equipment is such that the phase angle of the 5 harmonic
current has no preferential value over time during normal operation and can take any value
from 0° to 360°.
NOTE 5 This condition is normally fulfilled by converters with fully controlled thyristor bridges.

© IEC 2021
th
c) Among all the 5 harmonic current values measured in each DFT time window as defined
th
in IEC 61000-4-7 over the entire test observation period, the phase angle of the 5 harmonic
current related to the fundamental phase-to-neutral voltage (see 3.16) is in the range of 90°
to 150° for at least 99 % of the harmonic current values that have an RMS value higher than
10,7 % of the reference current.
NOTE 6 This condition is normally fulfilled by equipment with an uncontrolled rectifier bridge and capacitive
filter, including a 3 % AC or 4 % DC reactor.
Table 5 may be used with balanced three-phase equipment if any one of the following conditions
is met:
th th
d) The 5 and 7 harmonic currents are each less than 3 % of the reference current during
the whole test observation period.
NOTE 7 This condition is normally fulfilled by 12-pulse pieces of equipment.
th
e) The design of the piece of equipment is such that the phase angle of the 5 harmonic
current has no preferential value over time during normal operation and can take any value
from 0° to 360°.
NOTE 8 This condition is normally fulfilled by converters with fully controlled thyristor bridges.
th
f) Among all the 5 harmonic current values measured in each DFT time window as defined
th
in IEC 61000-4-7 over the entire test observation period, the phase angle of the 5 harmonic
current related to the fundamental phase-t
...