Amendment 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

Amendement 1 - 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

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Published
Publication Date
03-Jun-2021
Current Stage
PPUB - Publication issued
Completion Date
04-Jun-2021
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IEC 61000-3-12:2011/AMD1:2021 - Amendment 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
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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
IEC 61000-3-12:2011-05/AMD1:2021-06(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 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

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 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.
---------------------- Page: 4 ----------------------
IEC 61000-3-12:2011/AMD1:2021 – 3 –
© 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.
---------------------- Page: 5 ----------------------
– 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.

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.

---------------------- Page: 6 ----------------------
IEC 61000-3-12:2011/AMD1:2021 – 5 –
© IEC 2021

c) Among all the 5 harmonic current values measured in each DFT time window as defined

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.

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.

f) Among all the 5 harmonic current values measured in each DFT time window as defined

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

150° to 210° for at least 99 % of the harmonic current values that have an RMS value higher

than 10,7 % of the reference current.

NOTE 9 This condition is normally fulfilled by a 6-pulse converter with a small DC link capacitance, operating

as a load.
Add the following new subclause 5.3:
5.3 Procedure if the reference current is less than 16 A

If equipment that has a rated current above 16 A draws a reference current that is less than or

equal to 16 A under the specified test conditions, the manufacturer shall use one of the following

procedures:

a) Comply with the relevant emission limits given in IEC 61000-3-12, choosing the required

R .
sce

b) Comply with the absolute limits given in IEC 61000-3-2:2018, Table 1, instead of the

proportional limits given in IEC 61000-3-12, using and complying with all other requirements

given in IEC 61000-3-12, and the manufacturer shall state in the instruction manual

“Equipment complying with IEC 61000-3-12”, without having to declare a minimum short

circuit power S .

c) Change the test observation period to a representative 2,5 min period expected as the

operating period with the highest THC, and proceed as in a) above, choosing the required

R .
sce

The manufacturer shall state in the test report which of these procedures was used, so that

subsequent tests are carried out with the same procedure.
---------------------- Page: 7 ----------------------
– 6 – IEC 61000-3-12:2011/AMD1:2021
© IEC 2021
6 Product documentation
Replace the existing text with the following:
= 33,

For equipment complying with the harmonic current emission limits corresponding to R

sce

the manufacturer shall state in the instruction manual supplied with the equipment:

"Equipment complying with IEC 61000-3-12"

For equipment not complying with the harmonic current emission limits corresponding to

R = 33, the manufacturer shall determine the minimum value of R for which the limits given

sce sce

in the relevant Table 2, Table 3, Table 4 or Table 5 are not exceeded and either:

a) declare the value of the short-circuit power S corresponding to this minimum value of R

sc sce

(see 3.14) in the instruction manual, and instruct the user to determine, in consultation with

the distribution network operator if necessary, that the equipment is connected only to a

supply of that S value or more, or

b) declare the value of the short-circuit ratio R corresponding to this minimum value of R

sce sce

(see 3.14) in the instruction manual, and instruct the user to determine, in consultation with

the distribution network operator if necessary, that the characteristics of the equipment (S

equ

or I ) and the supply (S ) are such that a short-circuit ratio of that R value or more is

equ sc sce
achieved.
For item a), the statement in the instruction manual shall be:

"This equipment complies with IEC 61000-3-12 provided that the short-circuit power S is

greater than or equal to xx at the interface point between the user's supply and the public

system. It is the responsibility of the installer or user of the equipment to ensure, by consultation

with the distribution network operator if necessary, that the equipment is connected only to a

supply with a short-circuit power S greater than or equal to xx."

where xx is the value of S corresponding to the minimum value of R for which the limits

sc sce
given in the relevant Table 2, Table 3, Table 4 or Table 5 are not exceeded.
For item b), the statement in the instruction manual shall be:

"This equipment complies with IEC 61000-3-12 provided that the short-circuit ratio R is

sce
greater than or equal to xx at the
...

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