SIST EN 50470-4:2023
(Main)Electricity metering equipment - Part 4: Particular requirements - Static meters for DC active energy (class indexes A, B, C)
Electricity metering equipment - Part 4: Particular requirements - Static meters for DC active energy (class indexes A, B, C)
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of direct current electrical active energy in DC systems and it applies to their type tests.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant EN 62052 series or EN 62059 series.
This document applies to electricity metering equipment designed to:
- measure and control electrical energy on DC electrical networks with voltages up to 1 500 V;
NOTE 2 Meters for unearthed DC supplies and meters for three-wire DC networks are within the scope of this document.
- form a complete meter including the legally relevant display of measured values;
NOTE 3 Modular meters as described in WELMEC guide 11.7 are included.
- operate with integrated or detached legally relevant displays;
- optionally, provide additional functions other than those for measurement of electrical energy.
They can be used for measuring DC electrical energy, amongst others, in the following application areas:
- in EV (electrical vehicle) charging stations or in EV charging infrastructure (also called EVSE, electric vehicle supply equipment), if energy is measured on the DC side;
- in solar PV (photovoltaic) systems where DC power generation is measured;
- in low voltage DC networks for residential or commercial areas, if energy is measured on the DC side, including similar applications like information technology (IT) server farms or DC supply points for communication equipment;
- in DC supply points for public transport networks (e.g., for trolleybuses);
- in mobile applications on vehicles for e-road (electric road) systems.
Meters designed for operation with external DC instrument transformers or transducers can be tested for compliance with this document only if such meters and their transformers or transducers are tested together and meet the requirements for directly connected meters. Requirements in this document and in EN IEC 62052-11:2021/A11:2022 applying to meters designed for operation with DC LPITs also apply to meters designed for operation with external instrument transformers or transducers.
NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude, current magnitude, power, etc.; measurement of power quality parameters; load control functions; delivery, time, test, accounting, recording functions; data communication interfaces and associated data security functions. The relevant standards for these functions could apply in addition to the requirements of this document. However, the requirements for such functions are outside the scope of this document.
NOTE 5 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as voltage magnitude, current magnitude, power, etc., are covered in EN IEC 61557 12:2022. However, devices compliant with EN IEC 61557 12:2022 are not intended to be used as billing meters unless they are also compliant with EN IEC 62052-11:2021/A11:2022 and this document.
NOTE 6 Requirements for DC power quality (PQ) instruments, DC PQ measuring techniques, and DC PQ instrument testing are under discussion and will be specified in other standards.
[...]
Elektrizitätszähler - Teil 4: Besondere Anforderungen - Elektronische Wirkverbrauchszähler für Gleichstrom der Genauigkeitsklassen A, B und C
Equipement de comptage d'électricité - Partie 4: Exigences particulières - Compteurs statiques d'énergie active en courant continu (indices de classe A, B et C)
Le présent document s’applique uniquement aux compteurs statiques d’énergie active de classes de précision A, B et C, destinés à la mesure de l’énergie électrique active en courant continu sur les réseaux à tension continue, et à leurs essais de type.
NOTE 1 Pour les exigences générales, notamment en matière de construction, de CEM, de sécurité, de sûreté de fonctionnement, etc., voir la série EN 62052 ou la série EN 62059 correspondante.
Le présent document s’applique aux équipements de comptage de l’électricité conçus pour:
- mesurer et piloter l’énergie électrique sur les réseaux électriques en courant continu à des tensions allant jusqu’à 1 500 V;
NOTE 2 Les compteurs pour sources d’alimentation en courant continu non mises à la terre et les compteurs pour réseaux à trois fils en courant continu entrent dans le domaine d’application du présent document.
- constituer un compteur complet, afficheur légalement pertinent des valeurs mesurées inclus;
NOTE 3 Les compteurs modulaires décrits dans le guide WELMEC 11.7 sont inclus.
- fonctionner avec des afficheurs intégrés ou séparés légalement pertinents;
- assurer, en option, des fonctions autres que celles relatives au comptage de l’énergie électrique.
Ils peuvent servir à mesurer l’énergie électrique en courant continu, entre autres, dans les domaines d’application suivants:
- dans les bornes de charge en courant continu pour véhicules électriques (VE) ou dans les infrastructures de charge pour VE (également appelées systèmes d’alimentation pour véhicule électrique, SAVE), si l’électricité est mesurée côté courant continu;
- dans les systèmes photovoltaïques (PV) où la puissance générée en courant continu est mesurée;
- dans les réseaux basse tension en courant continu des zones résidentielles ou commerciales, si l’énergie est mesurée côté courant continu, y compris les applications similaires telles que les parcs de serveurs des technologies de l’information (TI) ou les points d’alimentation en courant continu pour les équipements de communication;
- dans les points d’alimentation en courant continu pour les réseaux de transport public (par exemple, pour les trolleybus);
- dans les applications mobiles sur les véhicules destinés aux systèmes "e-road" (route électrique).
Les compteurs conçus pour être alimentés par des transducteurs ou des transformateurs externes de mesure en courant continu peuvent uniquement être soumis à des essais de conformité au présent document si ces compteurs et leurs transducteurs ou transformateurs sont soumis à l’essai ensemble et satisfont aux exigences relatives aux compteurs à branchement direct. Les exigences énoncées dans le présent document et dans l’EN IEC 62052-11:2021/A11:2022, qui s’appliquent aux compteurs conçus pour fonctionner avec des transformateurs de mesure de faible puissance (LPIT, Low-Power Instrument Transformer) en courant continu, s’appliquent également aux compteurs conçus pour fonctionner avec des transducteurs ou des transformateurs externes de mesure.
NOTE 4 Les compteurs d’électricité modernes présentent généralement des fonctions additionnelles, notamment la mesure de l’amplitude de tension, de l’amplitude de courant, de la puissance, etc.; la mesure des paramètres de qualité de l’alimentation; des fonctions de pilotage; des fonctions de distribution, de temporisation, d’essai, de gestion, d’enregistrement; des fonctions relatives aux interfaces de communication de données et à la sécurité des données associées. Les normes pertinentes pour ces fonctions peuvent s’appliquer en plus des exigences du présent document. Toutefois, les exigences relatives à ces fonctions ne relèvent pas du domaine d’application du présent document.
[...]
Oprema za merjenje električne energije - 4. del: Posebne zahteve - Statični števci za aktivno enosmerno napetost (razred točnosti A, B, C)
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50470-4:2023
01-november-2023
Oprema za merjenje električne energije - 4. del: Posebne zahteve - Statični števci
za aktivno enosmerno napetost (razred točnosti A, B, C)
Electricity metering equipment - Part 4: Particular requirements - Static meters for DC
active energy (class indexes A, B, C)
Elektrizitätszähler - Teil 4: Besondere Anforderungen - Elektronische
Wirkverbrauchszähler für Gleichstrom der Genauigkeitsklassen A, B und C
Equipement de comptage d'électricité - Partie 4: Exigences particulières - Compteurs
statiques d'énergie active en courant continu (indices de classe A, B et C)
Ta slovenski standard je istoveten z: EN 50470-4:2023
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
SIST EN 50470-4:2023 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50470-4:2023
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SIST EN 50470-4:2023
EUROPEAN STANDARD EN 50470-4
NORME EUROPÉENNE
EUROPÄISCHE NORM August 2023
ICS 91.140.50
English Version
Electricity metering equipment - Part 4: Particular requirements -
Static meters for DC active energy (class indexes A, B and C)
Équipement de comptage de l'électricité - Partie 4: Elektrizitätszähler - Teil 4: Besondere Anforderungen -
Exigences particulières - Compteurs statiques d'énergie Elektronische Wirkverbrauchszähler für Gleichstrom der
active en courant continu (indices de classe A, B et C) Genauigkeitsklassen A, B und C
This European Standard was approved by CENELEC on 2023-07-24. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50470-4:2023 E
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SIST EN 50470-4:2023
EN 50470-4:2023 (E)
Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 7
4 Standard electrical values . 9
4.1 Voltages . 9
4.2 Currents . 9
4.2.1 General . 9
4.2.2 Nominal current . 10
4.2.3 Starting current . 10
4.2.4 Minimum current . 10
4.2.5 Maximum current . 10
4.3 Power consumption . 10
4.4 MMQ . 11
4.5 Integration (averaging) time . 11
5 Construction requirements . 11
5.1 General . 11
5.2 Meters with reduced overvoltage category (OVC) or reduced measurement category (CAT) . 12
6 Meter marking and documentation . 12
6.1 General . 12
6.2 MMQ . 12
7 Accuracy requirements . 12
7.1 General test conditions . 12
7.2 Methods of accuracy verification . 13
7.3 Measurement uncertainty . 13
7.4 Meter constant . 13
7.5 Initial start-up of the meter . 13
7.6 Test of no-load condition . 13
7.7 Starting current test . 13
7.8 Repeatability test . 13
7.9 Allowable errors due to variation of the current . 13
7.10 Allowable errors due to influence quantities and disturbances . 14
7.11 Time-keeping accuracy . 17
7.12 Accuracy tests at reference conditions and when affected by influence quantities . 17
7.13 Error of measurement . 17
7.14 Error of measurement for small amounts of energy . 18
8 Climatic conditions . 18
8.1 General . 18
8.2 Test of the effect of the climatic environments . 19
8.3 Meters specified for temperature ranges exceeding those of Table 14 . 19
9 The effects of external influences . 19
9.1 General . 19
9.2 Conducted differential mode current disturbances for DC meters . 19
9.3 Voltage unbalance . 20
10 Requirements concerning the software and protection against corruption . 20
10.1 General . 20
10.2 Identification of functions implemented in software . 21
2
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EN 50470-4:2023 (E)
10.3 Identification and protection of software . 21
10.4 Identification and protection of metrologically relevant parameters . 21
10.5 Setting of parameters. 21
10.6 Protection of measurement data . 22
10.7 Protection against influence by metrologically non-relevant software . 22
10.8 Protection against influence by connecting another device . 22
10.9 Meters intended for transmission of transaction data . 22
11 Type test . 22
12 Durability . 22
13 Reliability . 23
Annex A (informative) Calculation of the error of measurement . 24
Annex B (informative) Differential mode current disturbance test . 25
Annex C (informative) Differences between IEC and Directive 2014/32/EU . 26
Annex D (informative) Accuracy classes and class indexes . 28
D.1 General . 28
D.2 Class indexes . 28
Annex ZZ (informative) Relationship between this European standard and the essential requirements
of Directive 2014/32/EU aimed to be covered . 29
Bibliography . 32
3
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SIST EN 50470-4:2023
EN 50470-4:2023 (E)
European foreword
This document (EN 50470-4:2023) has been prepared by CLC/TC 13 “Electrical energy measurement and
control”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2024-07-24
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2026-07-24
conflicting with this document have to be
withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
1
This document is used in conjunction with EN IEC 62052-11:2021 .
2
This document is related to EN IEC 62053-41:2021 , Electricity metering equipment - Particular requirements -
Part 41: Static meters for DC energy (classes 0,5 and 1).
2
NOTE Terms differences for accuracy classes in related standard (EN IEC 62053-41:2021 ) and Directive 2014/32/EU
are listed in Annex D.
The structure of the standards is similar; modifications in this document are provided in the perspective of
compliance with the Essential Requirements of Directive 2014/32/EU on Measuring Instruments (MID).
This document has been prepared under a standardization request addressed to CENELEC by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZZ, which is an integral part of this document.
Any feedback and questions on this document should be directed to the users’ national committee. A complete
listing of these bodies can be found on the CENELEC website.
1
As impacted by EN IEC 62052-11:2021/A11:2022.
2
To be published. Stage at the time of publication: FprEN IEC 62053-41:2021.
4
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SIST EN 50470-4:2023
EN 50470-4:2023 (E)
1 Scope
This document applies only to static watt-hour meters of accuracy classes A, B and C for the measurement of
direct current electrical active energy in DC systems and it applies to their type tests.
NOTE 1 For general requirements, such as construction, EMC, safety, dependability etc., see the relevant
EN 62052 series or EN 62059 series.
This document applies to electricity metering equipment designed to:
— measure and control electrical energy on DC electrical networks with voltages up to 1 500 V;
NOTE 2 Meters for unearthed DC supplies and meters for three-wire DC networks are within the scope of this
document.
— form a complete meter including the legally relevant display of measured values;
NOTE 3 Electrical energy meters constructed from separate parts as described in WELMEC Guide 11.7:2017 are
included.
— operate with integrated or detached legally relevant displays;
— optionally, provide additional functions other than those for measurement of electrical energy.
They can be used for measuring DC electrical energy, amongst others, in the following application areas:
— in EV (electrical vehicle) charging stations or in EV charging infrastructure (also called EVSE, electric
vehicle supply equipment), if energy is measured on the DC side;
— in solar PV (photovoltaic) systems where DC power generation is measured;
— in low voltage DC networks for residential or commercial areas, if energy is measured on the DC side,
including similar applications like information technology (IT) server farms or DC supply points for
communication equipment;
— in DC supply points for public transport networks (e.g. for trolleybuses);
— in mobile applications on vehicles for e-road (electric road) systems.
Meters designed for operation with external DC instrument transformers, transducers or shunts can be tested
for compliance with this document only if such meters and their transformers, transducers or shunts are tested
together and meet the requirements for directly connected meters. Requirements in this document and in
1
EN IEC 62052-11:2021 applying to meters designed for operation with DC LPITs also apply to meters designed
for operation with external instrument transformers, transducers or shunts.
NOTE 4 Modern electricity meters typically contain additional functions such as measurement of voltage magnitude,
current magnitude, power, etc.; measurement of power quality parameters; load control functions; delivery, time, test,
accounting, recording functions; data communication interfaces and associated data security functions. The relevant
standards for these functions could apply in addition to the requirements of this document. However, the requirements for
such functions are outside the scope of this document.
NOTE 5 Product requirements for power metering and monitoring devices (PMDs) and measurement functions such as
7
voltage magnitude, current magnitude, power, etc., are covered in EN IEC 61557-12:2022 . However, devices compliant
7
with EN IEC 61557-12:2022 are not intended to be used as billing meters unless they are also compliant with
1
EN IEC 62052-11:2021 and this document.
NOTE 6 Requirements for DC power quality (PQ) instruments, DC PQ measuring techniques, and DC PQ instrument
testing are under discussion and will be specified in other standards.
5
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EN 50470-4:2023 (E)
This document does not apply to:
— portable meters;
NOTE 7 Portable meters are meters that are not permanently connected.
— meters used in rolling stock (railway applications), ships and airplanes;
NOTE 8 DC meters for rolling stock are covered by other standards, e.g. by the EN 50463 series.
— laboratory and meter test equipment;
— reference standard meters;
— data interfaces to the register of the meter;
— matching sockets or racks used for installation of electricity metering equipment;
— any additional functions provided in electrical energy meters.
This document does not cover measures for the detection and prevention of fraudulent attempts to compromise
meter’s performance (tampering).
NOTE 9 Nevertheless, specific tampering detection and prevention requirements, and test methods, as relevant for a
particular market are subject to the agreement between the manufacturer and the purchaser.
NOTE 10 Specifying requirements and test methods for fraud detection and prevention would be counterproductive, as
such specifications would provide guidance for potential fraudsters.
NOTE 11 There are many types of meter tampering reported from various markets; therefore, designing meters to detect
and prevent all types of tampering could lead to unjustified increase in costs of meter design, verification, and validation.
NOTE 12 Billing systems, such as smart metering systems, are capable of detecting irregular consumption patterns and
irregular network losses which enable discovery of suspected meter tampering.
1
NOTE 13 This document does not specify emission requirements. These are specified in EN IEC 62052-11:2021 , 9.3.14.
NOTE 14 Some aspects of meters for EVSE included in this document are expected to be covered by future documents
being worked on in WG 03 of CLC/TC 13 (EN 50732), so they may be removed in future editions of this standard.
2 Normative references
The following documents are referred to in the text in such a way that some of or all 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.
EN 61000-4-19:2014, Electromagnetic compatibility (EMC) - Part 4-19: Testing and measurement techniques -
Test for immunity to conducted, differential mode disturbances and signalling in the frequency range 2 kHz to
150 kHz at a.c. power ports (IEC 61000-4-19:2014)
3
EN 61010-1:2010 , Safety requirements for electrical equipment for measurement, control, and laboratory use
- Part 1: General requirements (IEC 61010-1:2010)
3
As impacted by EN 61010-1:2010/A1:2019 and EN 61010-1:2010/A1:2019/AC:2019-04.
6
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4
EN IEC 61010-2-030:2021 , Safety requirements for electrical equipment for measurement, control, and
laboratory use - Part 2-030: Particular requirements for equipment having testing or measuring circuits
(IEC 61010-2-030:2017)
1
EN IEC 62052-11:2021 , Electricity metering equipment - General requirements, tests and test conditions - Part
11: Metering equipment (IEC 62052-11:2020)
3 Terms and definitions
1
For the purposes of this document, the terms and definitions given in EN IEC 62052-11:2021 and the following
apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
1
NOTE The definitions listed in this document take precedence over those in EN IEC 62052-11:2021 .
3.1
direct current system
DC system
electrical system wherein DC electrical quantities are of primary importance
Note 1 to entry: For the qualifier DC, see IEC 60050-151:2001, 151-15-02.
3.2
direct current
electric current that is time-independent or, by extension, periodic current the direct component of which is of
primary importance
Note 1 to entry: In this context, “time-independent” means stable over periods in the range of tens of milliseconds.
[SOURCE: IEC 60050-131:2002, 131-11-22, modified – Note to entry has been deleted and a new Note 1 to
entry has been added.]
3.3
direct voltage
voltage that is time-independent or, by extension, periodic voltage the direct component of which is of primary
importance
Note 1 to entry: In this context, “time-independent” means stable over periods in the range of tens of milliseconds.
[SOURCE: IEC 60050-131:2002, 131-11-23, modified – Note to entry has been deleted and a new Note 1 to
entry has been added.]
3.4
DC power
DC active power
product of the mean value of direct current flowing through a two-terminal circuit and the mean value of direct
voltage across it
Note 1 to entry: There is no DC reactive power.
4
As impacted by EN IEC 61010-2-030:2021/A11:2021.
7
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3.5
DC energy
DC active energy
time integral of DC power
Note 1 to entry: The coherent SI unit of active energy is joule, J. Another unit is watt hour. Its multiple, kilowatt hour, kWh,
is commonly used for billing consumers of electrical energy and is therefore indicated on electrical energy meters.
1
Note 2 to entry: DC energy is a form of active energy as defined in EN IEC 62052-11:2021 .
3.6
DC energy meter
instrument intended to measure DC (active) energy
3.7
transitional current
I
tr
value of the current at, and above which, up to I full accuracy requirements of this document apply
max
3.8
influence quantity
quantity that is not the measurand but that affects the result of measurement
3.9
disturbance
influence quantity having a value within the limits specified in the appropriate requirement but outside the
specified rated operating conditions of the measuring instrument
Note 1 to entry: An influence quantity is a disturbance if for that influence quantity the rated operating conditions are not
specified.
3.10
critical change value
value above which the change in the measurement result is considered unacceptable
Note 1 to entry: The critical change value specifies here the maximum change in the measurement results for all
1
disturbances. In EN IEC 62052-11:2021 , the critical change value has another definition and meaning and applies only for
tests without any current.
3.11
rated operating condition
value for the measurand and influence quantities making up the normal working conditions of an instrument
3.12
maximum permissible error
MPE
maximum allowable error under rated operating conditions and in the absence of a disturbance
3.13
DC LPIT
LPIT for DC applications like DC current or DC voltage transformers or DC transducers (as defined in
IEC 60688:2021) including combined voltage/current transducers that supply power or energy values to the
meter
1
Note 1 to entry: Refer to EN IEC 62052-11:2021 for the definition of LPIT.
8
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3.14
legally relevant display
means to communicate legally relevant information like measurement results in a transparent, trustworthy and
non-discriminatory way
Note 1 to entry: Regulations applicable to the billing of energy can require information in addition to measurement values
to be shown. This display may be combined with other displays, e.g. for the unit price.
Note 2 to entry: Depending on the technical implementation, it can be necessary to show information identifying a given
transaction with its associated measurement result.
3.15
minimum measurable quantity
MMQ
minimum amount of energy for which the requirements of this document are met by an energy meter
3.16
pole
designation of a conductor, terminal or any other element of a DC system which is likely to be energized under
normal conditions, e.g. positive pole, negative pole
5
[SOURCE: IEC 60050-601:1985 , 601-03-12]
3.17
mid-point
pole with a potential in between the positive and the negative pole of a DC three-wire system
4 Standard electrical values
4.1 Voltages
1
The values in EN IEC 62052-11:2021 , 4.1 apply.
4.2 Currents
4.2.1 General
Table 1 — Preferred values of I and I
tr n
Meters for Current Value of current
A
0,5–1–1,5–2–3–4–5–8–
I
tr
9–12,5–30–50
Direct connection
5–10–15–20–30–40–50–80–
I
n
90–125–300–500
For meters intended for operation with DC LPITs, the values in Table 1 for direct connection apply to the primary
ratings of the DC LPITs used with the meter.
1
NOTE 1 The values for I are from EN IEC 62052-11:2021 , Table 3.
n
NOTE 2 Meters operating with external DC LPITs are sometimes specified for nominal current values greater than the
values in Table 1, e.g. common values to be considered are 600 A or 630 A.
5
As impacted by IEC 60050-601:1985/AMD2:2020.
9
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4.2.2 Nominal current
The nominal current I for direct connected meters shall be 10 I .
n tr
4.2.3 Starting current
Starting current I relation to I is shown in Table 2 below.
st tr
Table 2 — Starting current
Starting current I
st
Meters for
Class A Class B Class C
≤ 0,05 I ≤ 0,04 I ≤ 0,04 I
Direct connection
tr tr tr
4.2.4 Minimum current
Minimum current I relation to I is shown in Table 3 below.
min tr
Table 3 — Minimum current
Minimum current I
min
Meters for
Class A Class B Class C
≤ 0,5 I ≤ 0,5 I ≤ 0,3 I
Direct connection
tr tr tr
4.2.5 Maximum current
Maximum current I relation to I is shown in Table 4 below.
max tr
Table 4 — Maximum current
Maximum current I
max
Meters for
Class A Class B Class C
≥ 50 I ≥ 50 I ≥ 50 I
Direct connection
tr tr tr
4.3 Power consumption
The power consumption in the voltage, current and auxiliary power supply circuits shall be determined at
reference conditions given in 7.1 by any suitable method. The maximum uncertainty of the measurement of the
power consumption shall not exceed 5 % of the limits specified in Table 5.
The power consumption for the voltage and current circuits measured at reference temperature should not
exceed the values shown in Table 5.
In case of meters specified for multiple values of voltage or current, the measurements shall be conducted using
the values resulting in the worst case (highest) power consumption of the meter.
10
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EN 50470-4:2023 (E)
Table 5 — Power consumption
Meter circuit Power consumption
Voltage circuit (for non-self-powered meters) 0,5 W
Voltage circuit (for self-powered meters) not specified
Current circuit
120 mW/A · Imax
when measured at maximum current Imax
Auxiliary power supply measured at nominal
not specified
voltage of the auxiliary power supply
NOTE A common value for the power of an auxiliary supply is 2 W or 2 VA.
4.4 MMQ
In transaction-based meter applications such as EVSE, short transactions
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Questions, Comments and Discussion
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