oSIST prEN IEC 62052-11:2026

• Status: Not Published
• Public Enquiry End Date: 30-Jul-2026
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 91.140.50 - Electricity supply systems
• Technical Committee: MEE - Equipment for electrical energy measurement and load control
• Current Stage: 4020 - Public enquire (PE) (Adopted Project)
• Start Date: 11-Jun-2026
• Due Date: 29-Oct-2026
• Completion Date: 03-Aug-2026
• Directive: 2014/30/EU - Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility (recast)
• Directive:

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  2014/32/EU - Directive 2014/32/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of measuring instruments
• Mandate: M/541 - [C(2015)8558] Standardization request in support of the implementation of Directive 2014/32/EU on measuring instruments
• Mandate: M/552 - [C(2016) 7641 final] Standardisation request as regards harmonised standards in support of Directive 2014/30/EU of the European Parliament and of the Council of 26 February 2014 on the harmonisation of the laws of the Member States relating to electromagnetic compatibility
• Ref Project: prEN IEC 62052-11:2026 - Electricity metering equipment - General requirements, tests and test conditions - Part 11: Metering equipment

• Revises: SIST EN IEC 62052-11:2021/oprAC:2026 - Electricity metering equipment - General requirements, tests and test conditions - Part 11: Metering equipment
• Effective Date: 18-Mar-2025
• Revises: SIST EN IEC 62052-11:2021 - Electricity metering equipment (a.c.) - General requirements, tests and test conditions - Part 11: Metering equipment
• Effective Date: 12-Mar-2024
• Revises: SIST EN IEC 62052-11:2021/A11:2022 - Electricity metering equipment - General requirements, tests and test conditions - Part 11: Metering equipment
• Effective Date: 12-Mar-2024
• Revises: SIST EN IEC 62052-11:2021/A12:2024 - Electricity metering equipment - General requirements, tests and test conditions - Part 11: Metering equipment
• Effective Date: 12-Mar-2024

oSIST prEN IEC 62052-11:2026 is the Slovene adoption of the IEC work on electricity metering equipment, identical to prEN IEC 62052-11:2026. It specifies general requirements, tests and test conditions for AC and DC electricity meters, including construction, marking, metrological performance, climatic endurance and immunity to external influences. Manufacturers, test laboratories and conformity assessors use it to check whether a meter design is suitable for type testing and for defined installation and operating conditions.

What does oSIST prEN IEC 62052-11:2026 specify?

oSIST prEN IEC 62052-11:2026 covers electricity metering equipment intended to measure and control electrical energy on networks up to 1 000 V AC or 1 500 V DC. It applies to meters with integrated displays, detached displays, or no display, and to meters installed independently or in sockets or racks.

The document is organized into:

• Scope, normative references, terms and definitions
• Nominal electrical values
• Construction requirements and tests
• Meter marking and documentation
• Metrological performance requirements and tests
• Climatic requirements and tests
• Effects of external influence quantities and disturbances
• Type test requirements

It also includes annexes for test outputs, pulse interfaces, symbols, EMC set-ups, special applications, multi-branch meters, transducer-operated meters and reference formulas.

Annex	What it covers
A	Optical test output
B	Class A, B and C electrical pulse outputs and inputs
C	Pulse outputs and inputs for special applications and long distances
D	Meter symbols and markings
E	Meter ports
F	EMC test set-up
G	Test circuits for harmonics and interharmonics
H	Short-time overcurrent test waveform
I	Fast load current variation test
J	Electromagnet for external magnetic field tests
K	Earth fault test circuit
L	Meter current signal range
M	Multi-Branch Circuit Energy Meters
N	Testing of transducer-operated meters
R	Reference definitions and formulas

What are the key requirements of oSIST prEN IEC 62052-11:2026?

Scope, design form and installation

Clause 1 sets the basic design envelope for the meter. oSIST prEN IEC 62052-11:2026 covers meters with all functional elements in one meter case, except displays and transducers, and allows optional functions beyond energy measurement.

For meter designs with external transducers, the standard allows two test approaches:

• test the meter and transducers together as directly connected meters
• test the meter without transducers as a transducer-operated meter

That matters in practice because a buyer, lab or manufacturer needs to test the product in the form in which it will actually be used.

Electrical values and power burden

Clause 4 defines the nominal electrical values for voltage, current and frequency, and gives the power-consumption framework for AC meters. The meter manufacturer has to declare the burden characteristics needed to match voltage and current instrument transformers, and the meter’s own consumption is measured at reference conditions.

This matters when selecting meters for transformer-fed systems, because the burden affects the rest of the installation and can influence metering accuracy and transformer loading.

Construction, interfaces and marking

Clause 5 requires the meter to meet the safety requirements of IEC 62052-31:2024, including detached displays. It also requires protection against corrosion, a case that cannot be deformed into malfunction, a cover that cannot be removed without a tool, and mechanical verification by shock and vibration tests.

Clause 5 also covers practical features that affect daily use:

• windows for reading displays and observing the operation indicator
• sealing of the case, terminal covers, detached displays and configuration
• storage of measured values in non-volatile memory for at least 12 months after power loss
• pulse outputs and pulse inputs, with Annex A, Annex B and Annex C giving interface details and test arrangements
• auxiliary power supply behavior, including automatic changeover between power sources where both are used

Clause 6 covers marking and documentation. The meter has to carry the required identification, connection information and symbols, and Table 8 gives precedence over other marking and documentation requirements named in the document set. The nameplate information has to remain indelible and legible in normal use.

Metrological performance and accuracy checks

Clause 7 is the core metrology section. oSIST prEN IEC 62052-11:2026 requires type testing at defined reference conditions, with the meter installed as intended and stabilized before measurements are taken. Accuracy can be verified either by standard meter test methods from IEC 62057-1:2023 or by reading energy registers through communication ports.

The clause also defines how test uncertainty is handled. The expanded measurement uncertainty has to be assessed, and the acceptance rule depends on the accuracy class. For readers, that means the test report has to show both the measured error and the uncertainty basis used to judge it.

Other important metrological checks in Clause 7 include:

• meter constant verification against the display or register content
• initial start-up time
• no-load condition
• repeatability
• limits of error due to current variation
• limits of error shift due to influence quantities
• timekeeping accuracy for clocks that support primary functions, in line with IEC 62054-21:2004

Climatic and EMC robustness

Clause 8 sets the environmental framework for indoor and outdoor meters. It requires the meter to operate, store and transport within the climatic classes defined for its intended use, and it includes dry heat, cold, damp heat cyclic and solar radiation tests. Clause 8 also links durability to metrological stability testing.

Clause 9 addresses external influence quantities and disturbances. The test program covers electromagnetic and other disturbances such as supply dips, interruptions, DC ripple, electrostatic discharge, radiated RF fields, conducted disturbances, surge, ring wave, damped oscillatory wave, static and power-frequency magnetic fields, harmonics, voltage variation, temperature variation, frequency variation, reversed phase sequence, auxiliary voltage variation, short-time overcurrents, self-heating, fast load current variations and earth fault.

This section is important because it tells a purchaser or lab what kind of abnormal conditions the meter must tolerate without unacceptable metrological change.

Type testing and reporting

Clause 10 says the tests are carried out on a limited number of representative samples and configurations, including the worst-case configuration for the test being performed. The type test report has to be detailed enough to reproduce the testing, including the meter identification, accessories, firmware versions, test method, results, setup conditions and any use conditions needed to achieve compliance.

For quality and procurement work, that report is the evidence trail for comparing design variants and verifying that a configuration really matches the tested sample.

What terms does oSIST prEN IEC 62052-11:2026 define?

• meter - An electronic instrument in which currents and voltages act on solid-state elements to produce an output proportional to the energy measured.
• watt-hour meter - A meter intended to measure active energy by integrating active power over time.
• var-hour meter - A meter intended to measure reactive energy by integrating reactive power over time.
• multi-function meter - A meter that combines energy measurement with other functions such as maximum demand, time switching, communication or power monitoring.
• directly connected meter - A meter connected directly to the measured circuit without external instrument transformers or transducers.
• transformer-operated meter - A meter connected through external instrument transformers.
• detached display (DD) - A display in its own enclosure, separate from the meter case, powered by the meter and intended only for designated meter types.
• critical change value (CCV) - The maximum permitted change in the energy register during a disturbance test without current applied.

Who uses oSIST prEN IEC 62052-11:2026?

Meter manufacturers use oSIST prEN IEC 62052-11:2026 to design products, choose interfaces and prepare type-test evidence. Test laboratories use it to set up accuracy, climate, EMC and mechanical tests in a reproducible way.

Utilities, buyers and specification writers use it to compare meter designs for direct connection, transformer operation, transducer operation, socket mounting or rack mounting. Quality managers and conformity assessors use it to check markings, documentation, stability and the handling of representative configurations. It is also relevant to installers and system integrators who need to understand connection diagrams, auxiliary supplies, ports and sealing arrangements.

What changed in oSIST prEN IEC 62052-11:2026 from the previous edition?

oSIST prEN IEC 62052-11:2026 supersedes the committee drafts 13/1947/CD and 13/1994/CC.

Which standards are used with oSIST prEN IEC 62052-11:2026?

• IEC 62052-31:2024 - supplies the safety requirements for meters and detached displays, and also contributes marking requirements and durability checks.
• IEC 62053 series - provides the accuracy-class-specific requirements and other particular requirements for meter classes.
• IEC 62057-1:2023 - gives the meter test methods used for accuracy verification and test-station practice.
• IEC 62054-21:2004 - gives the timekeeping accuracy requirements for clocks that support meter primary functions.
• IEC CD 62059-32-1:2025 - is used for metrological stability testing linked to durability.
• IEC 60068-2-1, -2-2, -2-5, -2-6, -2-27, -2-30, -2-47 and -2-64 - provide the environmental test methods used for cold, dry heat, solar radiation, vibration, shock, damp heat and related dynamic tests.
• IEC 60038:2009 and AMD1:2021 - provide standard voltages.
• IEC 60050-131, -151 and -195 - provide terminology for circuit theory, electrical and magnetic devices, and earthing/protection against electric shock.
• IEC 60381-1:1982 - contributes the analogue signal framework referenced for process-control-style signals.
• IEC 60404-5:2015 and IEC 60404-8-1:2023 - support the magnetic material specifications used for the external magnetic field test devices.

What does the oSIST prEN IEC 62052-11:2026 document contain?

The document contains tables for nominal electrical values, power consumption, marking and documentation, voltage and current balance, climatic conditions, acceptance criteria and EMC test events. It also contains figures and circuit diagrams for optical test outputs, pulse outputs and inputs, EMC test set-ups, harmonics and interharmonics, magnetic field test devices, earth fault simulation, short-time overcurrent waveforms and fast load current variations.

Annex D shows example symbols and markings, including those for measuring elements, tariff functions, auxiliary devices and communication ports. Annex M and Annex N give guidance for multi-branch circuit energy meters and transducer-operated meters, so users can adapt the general requirements to more complex metering arrangements.

Annex R provides reference definitions and formulas for voltage, current, active power, active energy, reactive power and reactive energy in continuous, discrete and frequency-domain form. That annex supports test and comparison work where a laboratory needs a common mathematical basis for measured values.

SLOVENSKI STANDARD
01-julij-2026
Oprema za merjenje električne energije - Splošne zahteve, preskusi in preskusni
pogoji - 11. del: Merilna oprema
Electricity metering equipment - General requirements, tests and test conditions - Part
11: Metering equipment
Elektrizitätszähler - Allgemeine Anforderungen, Prüfungen und Prüfbedingungen - Teil
11: Messeinrichtungen
équipement de comptage de l'électricité - Exigences générales, essais et conditions
d'essai - Partie 11: équipement de comptage
Ta slovenski standard je istoveten z: prEN IEC 62052-11:2026
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

13/1999/CDV
COMMITTEE DRAFT FOR VOTE (CDV)
PROJECT NUMBER:
IEC 62052-11 ED3
DATE OF CIRCULATION: CLOSING DATE FOR VOTING:
2026-06-05 2026-08-28
SUPERSEDES DOCUMENTS:
13/1947/CD, 13/1994/CC
IEC TC 13 : ELECTRICAL ENERGY MEASUREMENT AND CONTROL
SECRETARIAT: SECRETARY:
Hungary Mr Bela Bodi
OF INTEREST TO THE FOLLOWING COMMITTEES: HORIZONTAL FUNCTION(S):

TC 85,ACEC
ASPECTS CONCERNED:
SUBMITTED FOR CENELEC PARALLEL VOTING NOT SUBMITTED FOR CENELEC PARALLEL VOTING
Attention IEC-CENELEC parallel voting
The attention of IEC National Committees, members of
CENELEC, is drawn to the fact that this Committee Draft
for Vote (CDV) is submitted for parallel voting.
The CENELEC members are invited to vote through the
CENELEC online voting system.
This document is still under study and subject to change. It should not be used for reference purposes.
Recipients of this document are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
Recipients of this document are invited to submit, with their comments, notification of any relevant “In Some
Countries” clauses to be included should this proposal proceed. Recipients are reminded that the CDV stage is
the final stage for submitting ISC clauses. (SEE AC/22/2007 OR NEW GUIDANCE DOC).

TITLE:
Electricity metering equipment - General requirements, tests and test conditions - Part 11:
Metering equipment
PROPOSED STABILITY DATE: 2032
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IEC CDV 62052-11 © IEC 2026
CONTENTS
CONTENTS . 1
FOREWORD . 8
INTRODUCTION . 11
1 Scope . 13
2 Normative references . 14
3 Terms and definitions . 17
3.1 General definitions . 18
3.2 Definitions related to the functional elements . 23
3.3 Definitions of meter ports . 27
3.4 Definitions of mechanical elements . 29
3.5 Definitions related to measurements . 31
3.6 Definitions related to external influences . 35
3.7 Definition of tests . 38
3.8 Definitions related to meter marking and symbols . 38
4 Nominal electrical values . 40
4.1 Voltages . 40
4.1.1 Nominal voltages signals . 40
4.1.2 Voltage signal ranges . 41
4.2 Currents . 41
4.2.1 Nominal current signals . 41
4.2.2 Starting current signal . 42
4.2.3 Minimum current signal . 42
4.2.4 Transitional current signal . 42
4.2.5 Maximum current signal . 42
4.2.6 Current signal ranges . 43
4.3 Frequencies . 43
4.3.1 Nominal frequencies . 43
4.3.2 Frequency ranges . 43
4.4 Power consumption. 43
5 Construction requirements and tests. 44
5.1 General . 44
5.2 Mechanical tests . 45
5.2.1 Acceptance criteria . 45
5.2.2 Shock test . 45
5.2.3 Vibration test . 45
5.3 Window . 46
5.4 Terminals - Terminal block(s) - Protective conductor terminal . 46
5.5 Sealing provisions . 46
5.5.1 General . 46
5.5.2 Sealing of meter case . 46
5.5.3 Sealing of meter terminal covers. 46
5.5.4 Sealing of detached displays . 47
5.5.5 Sealing of meter configuration . 47
5.6 Display of measured values . 47
5.6.1 General . 47
5.6.2 Meters without displays . 48
IEC CDV 62052-11 © IEC 2026
5.6.3 Meters with displays . 48
5.7 Storage of measured values . 49
5.8 Pulse outputs . 49
5.8.1 General . 49
5.8.2 Optical test output . 49
5.8.3 Electrical pulse outputs . 50
5.8.4 Operation indicator . 51
5.9 Electrical pulse inputs . 51
5.9.1 General characteristics . 51
5.9.2 Functional tests of electrical pulse inputs. 51
5.10 Auxiliary power supply . 52
6 Meter marking and documentation . 52
6.1 Meter accuracy class marking . 52
6.2 Meter marking . 52
6.3 Connection diagrams and terminal marking . 57
6.4 Symbols . 57
6.4.1 General . 57
6.4.2 Symbols for the measuring elements . 57
6.4.3 Symbols for transformer-operated or transducer-operated meters . 58
6.4.4 Identification of the displayed information . 58
6.4.5 Marking of the measured quantity . 58
6.4.6 Symbols of principal units used for meters (see Table 9) . 59
6.4.7 Symbols for auxiliary devices. 59
6.4.8 Symbols for communication ports . 59
6.5 Documentation . 59
6.5.1 Installation manuals . 59
6.5.2 Instruction for use . 60
7 Metrological performance requirements and tests . 60
7.1 General test conditions . 60
7.2 Methods of accuracy verification . 62
7.3 Measurement uncertainty . 62
7.4 Meter constant . 63
7.5 Initial start-up time of the meter . 64
7.6 Test of no-load condition . 64
7.7 Starting current signal test . 65
7.8 Repeatability test . 65
7.9 Limits of error due to variation of the current . 66
7.10 Limits of error shift due to influence quantities . 66
7.11 Time-keeping accuracy . 66
8 Climatic requirements and tests . 66
8.1 General . 66
8.2 Environmental conditions . 66
8.3 Tests of the effects of the climatic environments . 67
8.3.1 General test requirements . 67
8.3.2 Acceptance criteria . 67
8.3.3 Dry heat test . 67
8.3.4 Cold test . 68
8.3.5 Damp heat cyclic test . 68
8.3.6 Protection against solar radiation . 68
IEC CDV 62052-11 © IEC 2026
8.4 Durability . 69
9 The effects of external influence quantities and disturbances . 69
9.1 General . 69
9.2 Acceptance criteria . 71
9.3 Electromagnetic compatibility (EMC) . 72
9.3.1 General . 72
9.3.2 Voltage dips, short interruptions, and DC ripple . 74
9.3.3 Electrostatic discharge immunity test . 76
9.3.4 Radiated, radio-frequency, electromagnetic field immunity test - test
without current signal . 77
9.3.5 Radiated, radio-frequency, electromagnetic field immunity test - test
with current signal . 77
9.3.6 Electrical fast transient/burst immunity test . 78
9.3.7 Immunity to conducted disturbances, induced by radio-frequency fields . 78
9.3.8 Test for immunity to conducted, differential mode current disturbances . 79
9.3.9 Surge immunity test . 80
9.3.10 Ring wave immunity test . 83
9.3.11 Damped oscillatory wave immunity test . 84
9.3.12 External static magnetic fields . 85
9.3.13 Power frequency magnetic field immunity test . 86
9.3.14 Emission requirements . 86
9.4 Tests of immunity to other influence quantities . 87
9.4.1 General . 87
9.4.2 Harmonics in the current and voltage circuits . 87
9.4.3 Voltage signal variation . 88
9.4.4 Ambient temperature variation . 89
9.4.5 Interruption of phase voltage . 89
9.4.6 Frequency variation . 90
9.4.7 Reversed phase sequence. 90
9.4.8 Auxiliary voltage variation . 91
9.4.9 Operation of auxiliary devices . 91
9.4.10 Short-time overcurrents . 91
9.4.11 Self-heating . 92
9.4.12 Fast load current variations . 93
9.4.13 Earth fault . 93
10 Type test . 94
10.1 Test conditions . 94
10.2 Type test report . 94
Annex A (normative) Optical test output . 96
Annex B (normative) Class A, B and C electrical pulse outputs and inputs . 98
B.1 Electrical characteristics of pulse outputs and inputs . 98
B.1.1 Electrical characteristics of pulse outputs . 98
B.1.2 Electrical output pulse waveform . 98
B.1.3 Test of electrical pulse outputs . 99
B.1.4 Test of electrical pulse inputs . 99
B.2 Class C electronic pulse outputs . 100
B.2.1 Characteristics of class C electronic pulse outputs . 100
Annex C (normative) Electrical pulse output for special applications and long
distances according to IEC 60381-1:1982 . 102
IEC CDV 62052-11 © IEC 2026
C.1 Operating conditions and output pulse waveform . 102
C.2 Test of pulse output for special applications and long distances . 103
C.3 Test of pulse input for special applications and long distances . 103
Annex D (informative) Meter symbols and markings . 105
Annex E (informative) Meter ports . 115
Annex F (informative) Test set-up for EMC tests . 119
Annex G (normative) Test circuit diagrams for testing influence of harmonics and
interharmonics . 121
Annex H (informative) Short time overcurrent test waveform . 128
Annex I (informative) Fast load current variation test . 129
Annex J (normative) Electromagnet for testing the influence of externally produced
magnetic fields . 130
J.1 Permanent magnet and electromagnet for testing the influence of external
static magnetic field . 130
J.2 Electromagnet for testing the influence of external static magnetic field with
magneto-motive force of 1 000 At (ampere-turns) . 130
Annex K (normative) Test circuit diagram for the test of immunity to earth fault . 132
Annex L (informative) Meter current signal range . 133
Annex M (informative) Application to Multi-Branch Circuit Energy Meters . 134
M.1 Overview . 134
M.2 Definitions . 134
M.3 General . 134
M.4 Cross-channel influences . 135
M.5 Channel configuration and sealing for multi-branch meters . 135
M.6 Verification for multi-branch meters . 135
Annex N (informative) Testing of transducer-operated meters . 136
N.1 General . 136
N.2 Transducer-operated meters tested with external transducers, as directly
connected meters . 136
N.2.1 General . 136
N.2.2 Example test setup for testing transducer-operated meters as directly
connected meters . 137
N.3 Transducer-operated meters tested with reference transducers . 137
N.3.1 General . 137
N.3.2 Example test setup for testing transducer-operated meters with
reference transducers . 138
N.4 Other methods of testing of transducer-operated meters . 139
N.4.1 Example test setup for testing transducer-operated meters with
simulated transducer signals . 139
Annex O (informative) Application of this standard to meters with detached displays . 140
Annex P (informative) Geometric representation of active and reactive power . 141
Annex Q (informative) Immunity to conducted common mode disturbances in the
frequency range from d.c to 150 kHz . 145
Annex R (informative) Mathematical definitions of the measured quantities . 146
R.1 General . 146
R.2 Abbreviations . 146
R.3 Voltage and current . 148
R.3.1 Voltage and current in the continuous time domain . 148
R.3.2 Voltage and current in the discrete time domain . 149
IEC CDV 62052-11 © IEC 2026
R.3.3 Voltage and current in the frequency domain . 149
R.4 Active power . 150
R.4.1 Active power in the continuous time domain . 150
R.4.2 Active power in the discrete time domain . 150
R.4.3 Active power in the frequency domain. 151
R.5 Active energy . 151
R.5.1 Active energy in the continuous time domain . 151
R.5.2 Active energy in the discrete time domain . 151
R.5.3 Active energy in the frequency domain . 152
R.5.4 Active energy in polyphase system . 152
R.6 Reactive power . 152
R.6.1 Fundamental reactive power in the frequency domain . 152
R.7 Reactive energy . 152
R.7.1 Fundamental reactive energy in the frequency domain . 152
R.7.2 Reactive energy in polyphase systems . 152
Bibliography . 153

Figure A.1 – Test arrangement for the optical test output . 96
Figure A.2 – Waveform of the optical test output . 96
Figure B.1 – Physical interface of the electrical pulse output . 98
Figure B.2 – Electrical output pulse waveform. 98
Figure B.3 – Pulse output test set-up . 99
Figure B.4 – Pulse input test set-up . 99
Figure B.5 – Non-isolated pulse output schematic . 100
Figure B.6 – Isolated pulse output schematic . 100
Figure B.7 – Electronic pulse output waveform . 101
Figure C.1 – Output pulse waveform . 102
Figure C.2 – Pulse output test set-up . 103
Figure C.3 – Pulse input test set-up . 104
Figure D.1 – Cross-phase connection of a var-hour meter with two measuring elements
in three-phase three-wire circuits . 109
Figure E.1 – Example: ports of a directly connected meter . 115
Figure E.2 – Example: ports of a transformer-operated meter . 116
Figure E.3 – Example: ports of a transducer-operated meter when type-tested with
transducers as a directly connected meter . 117
Figure E.4 – Example: ports of a transducer-operated meter when type-tested without
transducers . 118
Figure F.1 – Test set-up for the electrical fast transient/burst immunity test for
transformer-operated meters: each port (Mains, CT, HLV, ELV) is tested separately by
adding the coupling device to the respective port . 119
Figure F.2 – Test set-up for the electrical fast transient/burst immunity test for directly
connected meters : each port (Mains, HLV, ELV) is tested separately by adding the
coupling device to the respective port . 120
Figure G.1 – Test circuit diagram (informative, test of influence of interharmonics and
odd harmonics) on directly connected meter , transformer-operated meter , or
transducer-operated meter (current transducer with current output) . 121
Figure G.2 – Test circuit diagram (informative, test of influence of interharmonics and
odd harmonics) on transducer-operated meter (current transducer with voltage output) . 122
IEC CDV 62052-11 © IEC 2026
Figure G.3 – Burst-fired (integral cycle control) current signal waveform . 122
Figure G.4 – Informative distribution of interharmonic content of burst-fired current
signal waveform (the Fourier analysis is not complete) . 123
Figure G.5 – Phase fired waveform (odd harmonics) - 90° fired current signal waveform . 123
Figure G.6 – Informative distribution of harmonic content of 90° phase fired current
signal waveform (the Fourier analysis is not complete) . 124
Figure G.7 – Phase fired waveform (odd harmonics) - 45° fired current signal waveform . 124
Figure G.8 – Phase fired waveform (odd harmonics) - 135° fired current signal
waveform . 125
Figure G.9 – Test circuit diagram (informative) for half-wave rectification (DC and even
harmonics) . 125
Figure G.10 – Half-wave rectified current signal waveform (DC and even harmonics) . 126
Figure G.11 – Informative distribution of harmonic content of half-wave rectified current
signal waveform (the Fourier analysis is not complete) . 127
Figure J.1 – Electromagnet for testing the influence of external static magnetic field
with magneto-motive force of 1 000 At (ampere-turns) . 131
Figure K.1 – Circuit to simulate earth fault condition in phase 1 . 132
Figure K.2 – Voltages at the meter under test . 132
Figure L.1 – Meter current signal range . 133
Figure N.1 – Example test setup for testing transducer-operated meters as directly
connected meters . 137
Figure N.2 – Test setup for testing transducer-operated meters with external reference
transducers . 138
Figure N.3 – Test setup for testing transducer-operated meters with simulated
transducer signals . 139
Figure P.1 – Energy flow by quadrant [SOURCE: NEMA C12.31G-TR-2024:2024 [14]] . 141
Figure P.2 – Historical representation of energy flow by quadrant [SOURCE: NEMA
C12.31G-TR-2024:2024 [14]] . 142
Figure P.3 – Historical geometric representation [SOURCE: IEC 62053-23:2003 [21] ] . 143
Figure P.4 – Historical alternative geometric representation [SOURCE: IEC 62053-
23:2003 [21] ] . 144

Table 1 – Examples of constant C for different instrument transformer ratios . 39
Table 2 – Preferred nominal values of voltage signals . 40
Table 3 – Voltage ranges . 41
Table 4 – Preferred nominal values of current signals . 41
Table 5 – Current signal ranges . 43
Table 6 – Frequency ranges . 43
Table 7 – Maximum power consumption . 44
Table 8 – Marking and documentation requirements . 53
Table 9 – Symbols of principal units used for meters . 59
Table 10 – Voltage and current balance . 60
Table 11 – Reference conditions . 61
Table 12 – Repeatability test points . 65
Table 13 – Environmental conditions . 66
Table 14 – Summary of the tests of immunity to influence quantities . 70
IEC CDV 62052-11 © IEC 2026
Table 15 – Summary of the tests of immunity to disturbances . 70
Table 16 – Acceptance criteria . 71
Table 17 – Tests of immunity to dips and short interruptions of AC supply voltage . 74
Table 18 – Tests of immunity to dips and short interruptions of DC supply voltage . 75
Table 19 – Surge and ring wave immunity test levels for the meter's mains ports,
current transformer ports and current transducer ports . 82
Table 20 – Evaluation of primary meter functions under influence of voltage signal
variation for directly connected, and transformer or transducer-operated meters . 89
Table 21 – Short-time overcurrent test . 92
Table A.1 – Operating conditions of the optical test output . 97
Table B.1 – Operating conditions of the electrical pulse outputs . 98
Table B.2 – Test of pulse output . 99
Table B.3 – Test of pulse input device . 100
Table B.4 – Operating conditions of electronic pulse outputs . 101
Table C.1 – Operating conditions of pulse output for special applications and long
distances . 102
Table C.2 – Test of pulse output device . 103
Table C.3 – Test of pulse input device . 104
Table D.1 – Examples of voltage marking according to network voltage . 105
Table D.2 – Symbols for measuring elements . 106
Table D.3 – Marking of the measured quantity (examples) . 109
Table D.4 – Inscriptions of the accuracy class and the meter constant (examples) . 110
Table D.5 – Symbols for transformer-operated meters and transducer-operated meters
(examples) . 110
Table D.6 – Tariff function symbols (examples) . 111
Table D.7 – Symbols for tariff function (examples) . 112
Table D.8 – Symbols for auxiliary devices (examples) . 112
Table D.9 – Symbols for communication ports (examples) . 113
Table M.1 – Cross-channel influence test conditions for Multi-Branch Circuit Energy
Meters . 135

IEC CDV 62052-11 © IEC 2026
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Electricity metering equipment - General requirements, tests and test
conditions -
Part 11: Metering equipment
FOREWORD
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9) IEC draws attention to the possibility that the implementation of this document may involve
the use of (a) patent(s). IEC takes no position concerning the evidence, validity or applicability
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IEC CDV 62052-11 © IEC 2026
document. However, implementers are cautioned that this may not represent the latest
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IEC shall not be held responsible for identifying any or all such patent rights.
IEC 62052-11:2025 has been prepared by IEC technical committee 13: Electrical energy
measurement and control. It is an International Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Normative references have been updated,
b) Transducer-operated meters included in scope (tested without transducers)
c) Definitions of instrument transformers, current sensors, transducers, and transducer-
operated meters have been added,
d) Definition of accuracy class has been revised; definition of accuracy class index has been
removed,
e
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