IEC 62052-21:2004/AMD1:2016

IEC 62052-21 ®
Edition 1.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electricity metering equipment (a.c.) – General requirements, tests and test
conditions –
Part 21: Tariff and load control equipment

Équipement de comptage d’électricité (c.a.) – Prescriptions générales, essais
et conditions d’essai –
Partie 21: Equipement de tarification et de contrôle de charge

IEC 62052-21:2004-05/AMD1:2016-11(en-fr)

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IEC 62052-21 ®
Edition 1.0 2016-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
A MENDMENT 1
AM ENDEMENT 1
Electricity metering equipment (a.c.) – General requirements, tests and test

conditions –
Part 21: Tariff and load control equipment

Équipement de comptage d’électricité (c.a.) – Prescriptions générales, essais

et conditions d’essai –
Partie 21: Equipement de tarification et de contrôle de charge

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 91.140.50 ISBN 978-2-8322-3674-1

– 2 – IEC 62052-21:2004/AMD1:2016
© IEC 2016
FOREWORD
This amendment has been prepared by IEC technical committee 13: Electrical energy
measurement and control.
The text of this amendment is based on the following documents:
FDIS Report on voting
13/1702/FDIS 13/1716/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of this amendment and the base publication will
remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
NOTE The attention of National Committees is drawn to the fact that equipment manufacturers and testing
organizations may need a transitional period following publication of a new, amended or revised IEC publication in
which to make products in accordance with the new requirements and to equip themselves for conducting new or
revised tests.
It is the recommendation of the committee that the content of this publication be adopted for implementation
nationally not earlier than 4 years from the date of publication.
The contents of the corrigendum of March 2018 have been included in this copy.
_____________
INTRODUCTION TO AMENDMENT 1
The purpose of this amendment is to identify and remove all safety related requirements and
tests of IEC 62052-21:2004 that are replaced and extended by the complete set of
requirements and tests in IEC 62052-31:2015.
In addition, Annex F has been amended to refer to IEC 62058-11:2008 instead of IEC 60410
which has been withdrawn.
Introduction
Add the following to the list of standards:
IEC 62052-31:2015, Electricity metering equipment (AC) – General requirements, tests and
test conditions – Part 31: Product safety requirements and tests

 IEC 2016
1 Scope
Add the following after the fourth paragraph:
The safety aspect is covered by IEC 62052-31:2015.
2 Normative references
Add the following standard:
IEC 62052-31:2015, Electricity metering equipment (AC) – General requirements, tests and
test conditions – Part 31: Product safety requirements and tests
Remove the following standards:
IEC 60060-1:1989, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60085:1984, Thermal evaluation and classification of electrical insulation
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60695-2-10:2000, Fire hazard testing – Part 2-10: Glowing/hot-wire based test methods –
Glow-wire apparatus and common test procedures
IEC 60695-2-11:2000, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods
Glow-wire flammability test method for end-products
ISO 75-2:1993, Plastics – Determination of temperature of deflection under load – Part 2:
Plastic and ebonite
Add the following note:
NOTE Some standards referenced in IEC 62052-11:2003 have been revised or replaced, but these changes will
be considered in the full revision of this standard.
3 Terms and definitions
3.5 Definitions related to the output elements
3.5.6
rated breaking voltage
Replace the existing definition by:
See IEC 62052-31:2015, 6.9.8.2.2.
3.5.7
rated breaking current
Replace the existing definition by:
See IEC 62052-31:2015, 3.7.8, (breaking current) and 3.7.9, (breaking capacity).

– 4 – IEC 62052-21:2004/AMD1:2016
 IEC 2016
3.5.8
maximum total current
Replace the existing definition by:
See IEC 62052-31:2015, 3.7.5.
3.6 Definitions of mechanical elements
3.6.4
case
Replace the existing definition by:
See IEC 62052-31:2015, 3.2.5.
3.6.5
accessible conductive part
Replace the existing definition by:
See IEC 62052-31:2015, 3.5.1.
3.6.6
protective earth terminal
Replace the existing definition by:
See IEC 62052-31:2015, 3.2.8 (protective conductor terminal).
3.6.8
terminal cover
Replace the existing definition by:
See IEC 62052-31:2015, 3.2.6.
Delete the following two definitions:
3.6.9
clearance
3.6.10
creepage distance
3.7 Definitions of insulations
Replace the existing definitions 3.7.1 to 3.7.6 by:
See IEC 62052-31:2015, 3.6.
3.9 Definition of tests
type test
Add the following at the end of the definition:
See also IEC 62052-31:2015, 3.4.1.

 IEC 2016
5 Mechanical requirements and tests
5.1 General mechanical requirements
Replace the first paragraph and the dashed items by the following:
Tariff and load control equipment shall be designed and constructed in such a way as to avoid
introducing any danger in normal use and under normal conditions, so as to ensure
especially:
• protection against electrical shock, see IEC 62052-31:2015, Clause 6;
• protection against mechanical hazards and stresses, see IEC 62052-31:2015, Clauses 7
and 8;
• protection against spread of fire, see IEC 62052-31:2015, Clause 9;
• personal safety against effects of excessive temperature, see IEC 62052-31:2015, Clause
10;
• protection against penetration of dust and water, see IEC 62052-31:2015, Clause 11;
• protection against liberated gases and substances, explosion and implosion, see
IEC 62052-31:2015, Clause 12.
Add the the following at the end of the last paragraph:
See also IEC 62052-31:2015, 6.5.2.2, 6.9.1 and 6.9.7.3.
5.2 Case
5.2.1 Requirements
Delete the last paragraph.
5.2.2 Mechanical tests
5.2.2.1 Spring hammer test
Replace the existing text by:
The test shall be performed as part of safety testing, as specified in IEC 62052-31:2015, 8.2.
5.4 Terminals, terminal block(s), protective earth terminal
Replace the existing text by:
See IEC 62052-31:2015, 6.5.2, 6.9.5 and 6.9.7.
5.5 Terminal cover(s)
Replace the existing text by:
See IEC 62052-31:2015, 6.9.4.
5.6 Clearance and creepage distances
Replace the existing text by:
See IEC 62052-31:2015, 6.7.
– 6 – IEC 62052-21:2004/AMD1:2016
 IEC 2016
5.7 Insulating encased tariff and load control equipment of protective class II
Replace the existing text by:
See IEC 62052-31:2015:
• 3.6.8, (Protective) class II equipment;
• 5.4.5.1, Protective class and earthing;
• 6.5.2, Protective bonding;
• 6.8 Insulation requirements between circuits and parts, and Annex B, Examples for
insulation between parts;
• 6.9.2, Insulating materials.
5.8 Resistance to heat and fire
Replace the existing text by:
See IEC 62052-31:2015, Clause 9.
5.9 Protection against penetration of dust and water
Replace the existing text by:
See IEC 62052-31:2015, Clause 11.
5.12 Marking of tariff and load control equipment
At the beginning of the subclause, add the following:
This subclause shall be read together with IEC 62052-31:2015, Clause 5.
For tariff and load control related markings, the existing text applies. For safety related
markings, IEC 62052-31:2015, Clause 5, applies.
6.1 Temperature range
At the beginning of the subclause, add the following:
This subclause shall be read together with IEC 62052-31:2015, 1.4.1, 1.4.2 and 1.4.3.
6.2 Relative humidity
Replace the existing text by:
Tariff and load control equipment shall be designed to withstand the climatic conditions
specified in IEC 62052-31:2015, 1.4.1 c), 1.4.2 c) and 1.4.3. For a combined temperature and
humidity test, see 6.3.3 (of IEC 62052-21).
7.2 Heating
7.2.1 Requirements
Keep the first paragraph.
Replace the last two paragraphs by:
For equipment temperature limits and resistance to heat, see IEC 62052-31:2015, Clause 10.

 IEC 2016
7.2.2 Test
Replace the existing text by:
See IEC 62052-31:2015, 10.4.
7.3 Insulation
Replace the second sentence by:
Tariff and load control equipment shall meet the requirements and shall pass the tests
specified in IEC 62052-31:2015, 6.7, 6.8 and 6.10.
Delete subclause 7.3.2.
7.4 Output elements
7.4.1 Rated breaking voltage (U )
c
Replace the first paragraph and Table 7 by the following:
The switch or switches – except switches rated for 30 V d.c. – shall meet the requirements
specified in IEC 62052-31:2015, 6.9.8.5.
7.4.2 Rated breaking current (I )
c
Replace the first paragraph and Table 8 by the following:
The switch or switches – except switches rated for 30 mA d.c. – shall meet the requirements
specified in IEC 62052-31:2015, 6.9.8.5.
7.4.3 Number of operations of the output element
7.4.3.1 Requirements
Replace the first paragraph by:
Each load switch shall meet the endurance requirements specified in IEC 62052-31:2015,
6.9.8.5.
7.4.3.2 Test of number of operations of a.c. switches
Replace the first four paragraphs and the bullet points by:
Load control switches shall be tested as part of safety testing, as specified in IEC 62052-
31:2015, 6.10.7.1, 6.10.7.2, 6.10.7.3, 6.10.7.6, 6.10.7.7.
Keep the paragraph on maximum indicator switches that follows the three bullet points.
In the following paragraph, delete the first bullet point.
7.4.4 Short circuit performance
7.4.4.1 Requirements
Replace the existing text by:
See IEC 62052-31:2015, 6.9.8.5.

– 8 – IEC 62052-21:2004/AMD1:2016
 IEC 2016
7.4.4.2 Test of short-circuit performance
Replace the existing text by:
See IEC 62052-31:2015, 6.10.7.1, 6.10.7.2, 6.10.7.4, 6.10.7.5, 6.10.7.6 and 6.10.7.7.

 IEC 2016
Annex A
(normative)
Relationship between ambient air temperature and relative humidity
Replace the existing text and Figure A.1 by:
See IEC 62052-31:2015, 1.4.1 c) and 1.4.2 c).

– 10 – IEC 62052-21:2004/AMD1:2016
 IEC 2016
Annex E
(informative)
Test schedule
Replace the existing Table E.1 by the following new table:
Test of
Test of
particular
Test of particular
requirements
general requirements
for ripple
requirements for time
Nr. Tests
control
switches
receivers
IEC 62052-21 IEC 62054-11 IEC 62054-21
Subclause Subclause Subclause
1 Tests of insulation properties
1.1 To be performed as part of safety testing, as 7.3 X X
specified in IEC 62052-31:2015,6.10.
2 Test of control performance requirements
2.1 Operation X 7.5.2.2 N/A
2.2 Non-operation X 7.5.3.2 N/A
2.3 Correct operation within the tolerance of the X 7.5.5.2 N/A
message
2.4 Variation of the supply frequency 7.1.2 X X
3 Tests of time-keeping accuracy requirements
3.1 Time switch supplied by mains X N.A. 7.5.2.3.2.1
7.5.2.3.3.1
3.2 Time switch on operation reserve X N.A. 7.5.2.3.2.2
7.5.2.3.3.2
3.3 Time-keeping accuracy with temperature X N.A. 7.5.2.3.3.3
4 Tests of electrical requirements
4.1 Power consumption 7.1.3.2 X X
4.2 Heating: To be performed as part of safety testing 7.2.2
as specified in IEC 62052-31:2015, Clause 10.
5 Tests of output elements
5.1 Number of operation of a.c. switches: To be 7.4.3.2 X X
performed as part of safety testing, as specified in
by IEC 62052-31:2015 6.10.7.1, 6.10.7.2, 6.10.7.3,
6.10.7.6 and 6.10.7.7.
5.2 Number of operation of low rating d.c. switches 7.4.3.3 X X
5.3 Short-circuit performance: To be performed as part 7.4.4.2 X X
of safety testing, as specified in IEC 62052-31:2015,
6.10.7.1,6.10.7.2, 6.10.7.4, 6.10.7.5, 6.10.7.6 and
6.10.7.7.
5.4 Accuracy of maximum demand indicator switch 7.4.5.2 X X
6 Tests for electromagnetic compatibility (EMC)
6.1 Radio interference suppression X 7.7 7.7
6.2 Fast transient burst test X 7.6.5 7.6.5
6.3 Immunity to electromagnetic r.f. fields X 7.6.4 7.6.4
6.4 Immunity to conducted disturbances, induced by r.f. X 7.6.6 7.6.6
fields
6.5 Immunity to electrostatic discharges X 7.6.3 7.6.3
6.6 Surge immunity test X 7.6.7 7.6.7
6.7 Immunity to voltage dips and short interruptions X 7.6.8 7.6.8

 IEC 2016
Test of
Test of
particular
Test of particular
requirements
general requirements
for ripple
requirements for time
Nr. Tests
control
switches
receivers
IEC 62052-21 IEC 62054-11 IEC 62054-21
Subclause Subclause Subclause
6.8 Immunity to d.c. magnetic fields X 7.6.9 7.6.9
6.9 Immunity to a.c. magnetic fields X 7.6.10 7.6.10
6.10 Immunity to harmonics X 7.6.11 7.6.11
6.11 Immunity to interharmonics X 7.6.12 N/A
6.12 Immunity to disturbing pulses X 7.6.13 N/A
7 Tests of the effect of the climatic e
...