SIST EN 50470-1:2007

Electricity metering equipment (a.c.) -- Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)

This European Standard applies to newly manufactured watt-hour meters, measuring active electrical energy, intended for residential, commercial and light industrial use, for use on 50 Hz electrical networks. It specifies general requirements and type tests methods. It applies to electromechanical or static watt-hour meters for indoor and outdoor application, consisting of a measuring element and register(s) enclosed in a meter case. It also applies to operation indicator(s) and test output(s). If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or when other functional elements, like maximum demand indicators, electronic tariff registers, time switches, ripple control receivers, data communication interfaces, etc. are enclosed in the meter case (multi-function meters) then this standard applies only for the active energy metering part. This standard distinguishes between:-electromechanical and static meters; -meters of class indexes A, B and C;-direct connected and transformer operated meters;-protective class I and protective class II meters;-meters intended to be used indoors and outdoors. It does not apply to:-watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line voltage for meters for polyphase systems);-portable meters;-reference meters. For rack-mounted meters, the mechanical properties are not covered in this standard. The test levels are regarded as minimum values to guarantee the proper functioning of the meter under normal working conditions. For special applications, other test levels might be necessary and should be agreed on between the user and the manufacturer.

Wechselstrom-Elektrizitätszähler -- Teil 1: Allgemeine Anforderungen, Prüfungen und Prüfbedingungen - Messeinrichtungen (Genauigkeitsklassen A, B und C)

Equipement de comptage d'électricité (c.a.) -- Partie 1: Prescriptions générales, essais et conditions d'essai - Equipement de comptage (classes de précision A, B et C)

La présente Norme Européenne s’applique aux compteurs d’énergie active neufs, destinés à la mesure de l’énergie électrique active, à l’usage des habitations, des commerces et des petites industries, et utilisés sur des réseaux électriques à 50 Hz. Elle spécifie les exigences générales et les méthodes d’essais de type. Elle n’est applicable qu’aux compteurs d’énergie active électromécaniques ou statiques de types intérieur et extérieur, constitués d’un élément de mesure et d’un (des) élément(s) indicateur(s) rassemblés dans un même boîtier. Elle s’applique également à (aux) l’indicateur(s) de fonctionnement et au(x) dispositif(s) de sortie d’essai. Si le compteur a un (des) élément(s) de mesure pour plusieurs types d’énergie (compteurs d’énergies multiples), ou si d’autres éléments fonctionnels comme indicateurs de maximum, éléments indicateurs tarifaires électroniques, horloges de commutation, récepteurs de télécommande centralisée, interfaces de communication de données, etc. sont incorporés dans le boîtier du compteur (compteurs à fonctions multiples), la présente norme ne s’applique alors qu’à la partie de comptage de l’énergie active. La présente norme distingue entre : –   les compteurs électromécaniques et statiques ; –   les compteurs d’indices de classe A, B et C ; –   les compteurs à branchement direct et ceux alimentés par transformateur ; –   les compteurs avec classe de protection I et II ; –   les compteurs prévus pour l’utilisation à l’intérieur et à l’extérieur. Elle n’est pas applicable aux : –   compteurs d’énergie active dont la tension entre les bornes de raccordement excède 600 V (tension entre phases pour les compteurs des systèmes polyphasés) ; –   compteurs portatifs ; –   compteurs de référence. Pour des compteurs montés en châssis, les propriétés mécaniques ne sont pas comprises dans la présente norme. Les niveaux d’essai sont considérés comme des valeurs minimales pour garantir le bon fonctionnement du compteur dans des conditions de fonctionnement normales. Pour des applications spéciales, d’autres niveaux d’essai pourraient être nécessaires et il convient que ceux-ci fassent l’objet d’un accord entre l’utilisateur et le constructeur.

Oprema za merjenje električne energije (a.c.) - 1. del: Splošne zahteve, preskušanje in preskusni pogoji - Merilna oprema (razredni indeksi A, B in C)

Ta evropski standard se nanaša na novo proizvedene merilnike Wh,ki merijo aktivno električno energijo namenjeno za domačo, komercialno in industrijsko uporabo na 50 Hz električnem omrežju. Poudarja osnovne zahteve in preskusne postopke. Nanaša se na elektro-mehanične ali statične merilnike Wh za notranjo in zunanjo montažo, sestavljeno iz meritvenih elementov in registrov, ki so priloženi v merilnem ohišju. Uporablja se tudi kot indikator delovanja in preskusni izhod. Če ima merilnik več merilnih elementov za več vrst energije (multi energijski merilnik) ali ko so ostali funkcionalni elementi, kot indikatorji maksimuma, elektronski tarifni registri, časovna stikala, kontrolni prejemniki nihanj, podatkovni komunikacijski interface, itn. priloženi v merilno ohišje (multi funkcionalni merilniki) potem se ta standard nanaša samo na aktivni energijski merilni del. Ta standard razlikuje med: - elektromehaničnimi in statičnimi merilniki; - merilniki z razrednimi indeksi A,B in C; - direktno povezanimi in prenosno delujočimi merilniki; - merilniki zaščitnega razreda I in II; - merilniki, ki so namenjeni za zunanjo in notranjo montažo. Ne nanaša se na: - Wh merilnike, kjer napetost na priključnih sponkah presega 600 V (medlinijska napetost za merilnike za večfazne sisteme); - prenosne  merilnike; - referenčne merilnike. Za merilnike, ki se montirajo na standardizirane nosilce, mehanične lastnosti niso zajete v tem standardu. Preskusni nivoji veljajo za minimalne vrednosti, ki zagotavljajo pravilno delovanje merilnikov pod normalnimi delovnimi pogoji. Za posebne uporabe so lahko potrebni ostali preskusni nivoji ter morajo biti po dogovoru med uporabnikom in proizvajalcem.

General Information

• Status: Published
• Publication Date: 28-Feb-2007
• 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: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Mar-2007
• Due Date: 01-Mar-2007
• Completion Date: 01-Mar-2007
• Directive: 2004/108/EU - DIRECTIVE 2004/108/EC OF THE EUROPEAN PARLIAMENT AND OF THE COUNCIL of 15 December 2004 on the approximation of the laws of the Member States relating to electromagnetic compatibility and repealing Directive 89/336/EEC
• Directive: 2004/22/EC - Directive 2004/22/EC of the European Parliament and of the Council of 31 March 2004 on measuring instruments
• 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: 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
• Directive: 89/336/EEC - Electromagnetic compatibility (EMC)
• Mandate: M/347 - Programming mandate to CEN, CENELEX and ETSI relating to measuring instruments
• Ref Project: EN 50470-1:2006 - Electricity metering equipment (a.c.) - Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)

Relations

• Amended By: SIST EN 50470-1:2007/A1:2019 - Electricity metering equipment (a.c.) - Part 1: General requirements, tests and test conditions - Metering equipment (class indexes A, B and C)
• Effective Date: 01-Feb-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 50470-1:2007
01-marec-2007
2SUHPD]DPHUMHQMHHOHNWULþQHHQHUJLMHDFGHO6SORãQH]DKWHYH
SUHVNXãDQMHLQSUHVNXVQLSRJRML0HULOQDRSUHPDUD]UHGQLLQGHNVL$%LQ&
Electricity metering equipment (a.c.) -- Part 1: General requirements, tests and test
conditions - Metering equipment (class indexes A, B and C)
Wechselstrom-Elektrizitätszähler -- Teil 1: Allgemeine Anforderungen, Prüfungen und
Prüfbedingungen - Messeinrichtungen (Genauigkeitsklassen A, B und C)
Equipement de comptage d'électricité (c.a.) -- Partie 1: Prescriptions générales, essais et
conditions d'essai - Equipement de comptage (classes de précision A, B et C)
Ta slovenski standard je istoveten z: EN 50470-1:2006
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
91.140.50 Sistemi za oskrbo z elektriko Electricity supply systems
SIST EN 50470-1:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50470-1:2007

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SIST EN 50470-1:2007


EUROPEAN STANDARD
EN 50470-1

NORME EUROPÉENNE
October 2006
EUROPÄISCHE NORM

ICS 91.140.50


English version


Electricity metering equipment (a.c.)
Part 1: General requirements, tests and test conditions -
Metering equipment (class indexes A, B and C)



Equipement de comptage  Wechselstrom-Elektrizitätszähler
d'électricité (c.a.) Teil 1: Allgemeine Anforderungen,
Partie 1: Prescriptions générales, Prüfungen und Prüfbedingungen -
essais et conditions d'essai - Messeinrichtungen
Equipement de comptage (Genauigkeitsklassen A, B und C)
(classes de précision A, B et C)





This European Standard was approved by CENELEC on 2006-05-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Cyprus, the Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung

Central Secretariat: rue de Stassart 35, B - 1050 Brussels


© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50470-1:2006 E

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SIST EN 50470-1:2007
EN 50470-1:2006 – 2 –
Foreword
This European Standard was prepared by the Technical Committee CENELEC TC 13, Equipment for
electrical energy measurement and load control.
The text of the draft was submitted to the Unique Acceptance Procedure and was approved by
CENELEC as EN 50470-1 on 2006-05-01.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-05-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2009-05-01
This EN 50470-1 is related to EN 62052-11:2003, Electricity metering equipment (a.c.) – General
requirements, tests and test conditions – Part 11: Metering equipment.
The structure of the two standards is similar, modifications in this European Standard are provided in
the perspective of compliance with the essential requirements of the Directive 2004/22/EC on
Measuring Instruments (MID).
This standard is to be used with:
– EN 50470-2:2006, Electricity metering equipment (a.c.) – Part 2: Particular requirements –
Electromechanical meters for active energy (class indexes A and B) or
– EN 50470-3:2006, Electricity metering equipment (a.c.) – Part 3: Particular requirements –
Static meters for active energy (class indexes A, B and C).
This European Standard has been prepared under a mandate given to CENELEC by the European
Commission and the European Free Trade Association and covers essential requirements of EC
Directives 89/336/EMC and 2004/22/EC. See Annex ZZ.
__________

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SIST EN 50470-1:2007
– 3 – EN 50470-1:2006
Contents
1 Scope.6
2 Normative references .6
3 Terms and definitions .9
3.1 General definitions .9
3.2 Definitions related to the functional elements .11
3.3 Definitions of mechanical elements .13
3.4 Definitions related to insulation .14
3.5 Definitions of meter quantities .15
3.6 Definitions of influence quantities .17
3.7 Definitions of tests.20
3.8 Definitions related to electromechanical meters.20
3.9 Abbreviations .21
4 Standard electrical values .21
4.1 Standard reference voltages.21
4.2 Standard currents and current ranges .21
4.3 Standard reference frequency .22
5 Mechanical requirements and tests .22
5.1 General mechanical requirements .22
5.2 Case .23
5.2.1 Requirements .23
5.2.2 Mechanical strength tests of meter case.23
5.3 Window .24
5.4 Terminals - Terminal block(s) - Protective earth terminal .24
5.5 Terminal cover(s) .25
5.6 Clearance and creepage distances.25
5.7 Insulating encased meter of protective class II .26
5.8 Resistance to heat and fire.26
5.9 Protection against penetration of dust and water .27
5.10 Display of measured values.27
5.11 Output device and operation indicator .28
5.11.1 General .28
5.11.2 Mechanical and electrical characteristics .28
5.11.3 Optical characteristics .29
5.12 Marking of meter .29
5.12.1 Name-plates .29
5.12.2 Connection diagrams and terminal marking .31
5.13 Accompanying information .31
6 Climatic conditions .31
6.1 Temperature ranges .31
6.2 Relative humidity.32
6.3 Tests of the effect of the climatic environments .32
6.3.1 General .32
6.3.2 Dry heat test (Test B) .32
6.3.3 Cold test (Test A) .33
6.3.4 Damp heat cyclic test (Test Db).33
6.3.5 Protection against solar radiation (Test Sa) .33

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SIST EN 50470-1:2007
EN 50470-1:2006 – 4 –
7 Electrical requirements .34
7.1 Voltage range.34
7.2 Heating .34
7.3 Insulation .34
7.3.1 Requirements .34
7.3.2 General test conditions.34
7.3.3 Impulse voltage test .35
7.3.4 AC voltage test.36
7.4 Electromagnetic compatibility (EMC) .36
7.4.1 Electromagnetic environment.36
7.4.2 General requirements and test conditions.37
7.4.3 Critical change value .37
7.4.4 Immunity to voltage dips and short interruptions .38
7.4.5 Immunity to electrostatic discharges .38
7.4.6 Immunity to radiated RF electromagnetic fields.39
7.4.7 Immunity to electrical fast transients/bursts .39
7.4.8 Immunity to conducted disturbances, induced by RF fields .40
7.4.9 Immunity to surges .40
7.4.10 Immunity to damped oscillatory waves.41
7.4.11 Immunity to continuous magnetic fields of external origin .41
7.4.12 Immunity to power frequency magnetic fields of external origin.41
7.4.13 Radio interference suppression .42
8 Type test .42
8.1 Test conditions.42
Annex A (normative) Relationship between ambient air temperature and relative
humidity .43
Annex B (normative) Optical test output.44
Annex C (normative) Voltage waveform for the tests of the effect of voltage dips and
short interruptions .45
Annex D (informative) Test set-up for electromagnetic compatibility (EMC) tests .46
Annex E (normative) Electromagnet for testing the influence of continuous magnetic
fields of external origin .48
Annex F (informative) Test schedule - Recommended test sequences .49
Annex ZZ (informative) Coverage of Essential Requirements of EC Directives.51
Index .52
Figures
Figure A.1 – Relationship between ambient air temperature and relative humidity .43
Figure B.1 – Test arrangement for the test output.44
Figure B.2 – Waveform of the optical test output .44
Figure C.1 – Voltage interruptions of ΔU = 100 %, 1 s .45
Figure C.2 – Voltage interruptions of ΔU = 100 %, one cycle at rated frequency.45
Figure C.3 – Voltage dips of ΔU = 50 % .45
Figure D.1 – Test set-up for immunity to radiated RF electromagnetic fields.46
Figure D.2 – Test set-up for immunity to electrical fast transients/bursts: voltage circuits .46
Figure D.3 – Test set-up for immunity to electrical fast transients/bursts: current circuits.47

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SIST EN 50470-1:2007
– 5 – EN 50470-1:2006
Figure E.1 – Electromagnet for testing the influence of continuous magnetic fields of
external origin.48

Tables
Table 1 – Standard reference voltages.21
Table 2 – Standard values of I , I and I .21
tr ref n
Table 3 – Current ranges.22
Table 4 – Clearances and creepage distances for insulating encased meter of protective
class I.26
Table 5 – Clearances and creepage distances for insulating encased meter of protective
class II.26
Table 6 – Voltage marking .30
Table 7 – Upper and lower temperature limits .31
Table 8 – Preferred upper and lower temperature limits corresponding to IEC
environmental classes.32
Table 9 – Relative humidity.32
Table 10 – Voltage range .34

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SIST EN 50470-1:2007
EN 50470-1:2006 – 6 –
1 Scope
This European Standard applies to newly manufactured watt-hour meters, measuring active electrical
energy, intended for residential, commercial and light industrial use, for use on 50 Hz electrical
networks. It specifies general requirements and type tests methods.
It applies to electromechanical or static watt-hour meters for indoor and outdoor application, consisting
of a measuring element and register(s) enclosed in a meter case. It also applies to operation
indicator(s) and test output(s).
If the meter has (a) measuring element(s) for more than one type of energy (multi-energy meters), or
when other functional elements, like maximum demand indicators, electronic tariff registers, time
switches, ripple control receivers, data communication interfaces, etc. are enclosed in the meter case
(multi-function meters) then this standard applies only for the active energy metering part.
This standard distinguishes between:
– electromechanical and static meters;
– meters of class indexes A, B and C;
– direct connected and transformer operated meters;
– protective class I and protective class II meters;
– meters intended to be used indoors and outdoors.
It does not apply to:
– watt-hour meters where the voltage across the connection terminals exceeds 600 V (line-to-line
voltage for meters for polyphase systems);
– portable meters;
– reference meters.
For rack-mounted meters, the mechanical properties are not covered in this standard.
The test levels are regarded as minimum values to guarantee the proper functioning of the meter
under normal working conditions. For special applications, other test levels might be necessary and
should be agreed on between the user and the manufacturer.
2 Normative references
The following referenced documents are indispensable for the application 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.
Publication Year Title

EN 50470-2 2006 Electricity metering equipment (a.c.) – Particular requirements –
Part 2: Electromechanical meters for active energy (class indexes A
and B)
EN 50470-3 2006 Electricity metering equipment (a.c.) – Particular requirements –
Part 3: Static meters for active energy (class indexes A, B and C)

EN 55022 2006 Information technology equipment – Radio disturbance characteristics
– Limits and methods of measurement (CISPR 22:2005, mod.)
EN 60044-1 1999 Instrument transformers – Part 1: Current transformers
+ A1 2000 (IEC 60044-1:1996, mod. + A1:2000 + A2:2002)
+ A2 2003

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SIST EN 50470-1:2007
– 7 – EN 50470-1:2006
Publication Year Title
EN 60044-2 1999 Instrument transformers – Part 2: Inductive voltage transformers
+ A1 2000 (IEC 60044-2:1997, mod. + A1:2000 + A2:2002)
+ A2 2003
Environmental testing – Part 2: Tests – Tests A: Cold
EN 60068-2-1 1993
+ A1 1993 (IEC 60068-2-1:1990 + A1:1993 + A2:1994)
+ A2 1994
EN 60068-2-2 1974 Environmental testing – Part 2: Tests – Tests B: Dry heat
+ A1 1993 (IEC 60068-2-2:1974 + IEC 60068-2-2A:1976 + A1:1993 + A2:1994)
+ A2 1994
EN 60068-2-5 1999 Environmental testing – Part 2: Tests – Test Sa: Simulated solar
radiation at ground level (IEC 60068-2-5:1975)
EN 60068-2-6 1995 Environmental testing – Part 2: Tests – Test Fc: Vibration (sinusoidal)
(IEC 60068-2-6:1995 + corrigendum Mar. 1995)
Environmental testing – Part 2: Tests – Test Ka: Salt mist
EN 60068-2-11 1999
(IEC 60068-2-11:1981)
EN 60068-2-27 1993 Environmental testing – Part 2: Tests – Test Ea and guidance: Shock
(IEC 60068-2-27:1987)
EN 60068-2-30 1999 Environmental testing – Part 2: Tests – Test Db and guidance: Damp
heat, cyclic (12 + 12-hour cycle) (IEC 60068-2-30:1980 + A1:1985)
Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
EN 60068-2-75 1997
(IEC 60068-2-75:1997)
Electrical insulation – Thermal classification (IEC 60085:2004)
EN 60085 2004
EN 60359 2002 Electrical and electronic measurement equipment – Expression of
performance (IEC 60359:2001)
EN 60529 1991 Degrees of protection provided by enclosures (IP Code)
+ A1 2000 (IEC 60529:1989 + A1:1999)
EN 60695-2-10 2001 Fire hazard testing – Part 2-10: Glowing/hot-wire based test
methods – Glow-wire apparatus and common test procedure
(IEC 60695-2-10:2000)
EN 60695-2-11 2001 Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
(IEC 60695-2-11:2000)
EN 60721-3-1 1997 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 1:
Storage (IEC 60721-3-1:1997)
EN 60721-3-2 1997 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 2:
Transportation (IEC 60721-3-2:1997)
EN 60721-3-3 1995 Classification of environmental conditions – Part 3: Classification of
groups of environmental parameters and their severities – Section 3:
Stationary use at weatherprotected locations (IEC 60721-3-3:1994)
Electromagnetic compatibility (EMC) – Part 4-1: Testing and
EN 61000-4-1 2000
measurement techniques – Overview of IEC 61000-4 series
(IEC 61000-4-1:2000)
EN 61000-4-2 1995 Electromagnetic compatibility (EMC) – Part 4-2: Testing and
measurement techniques – Electrostatic discharge immunity test
+ A1 1998
+ A2 2001 (IEC 61000-4-2:1995 + A1:1998 + A2:2000)
EN 61000-4-3 2002 Electromagnetic compatibility (EMC) – Part 4-3: Testing and
measurement techniques – Radiated, radio-frequency,
electromagnetic field immunity test (IEC 61000-4-3:2002)

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SIST EN 50470-1:2007
EN 50470-1:2006 – 8 –
Publication Year Title
EN 61000-4-4 2004 Electromagnetic compatibility (EMC) – Part 4-4: Testing and
measurement techniques – Electrical fast transient/burst immunity test
(IEC 61000-4-4:2004)
EN 61000-4-5 1995 Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test (IEC 61000-4-5:1995)
EN 61000-4-8 1993 Electromagnetic compatibility (EMC) – Part 4-8: Testing and
+ A1 2001 measurement techniques – Power frequency magnetic field immunity
test (IEC 61000-4-8:1993 + A1:2000)
EN 61000-4-11 2004 Electromagnetic compatibility (EMC) – Part 4-11: Testing and
measurement techniques – Voltage dips, short interruptions and
voltage variations immunity tests (IEC 61000-4-11:2004)
EN 61000-4-12 1995 Electromagnetic compatibility (EMC) – Part 4-12: Testing and
+ A1 2001 measurement techniques – Oscillatory waves immunity test
(IEC 61000-4-12:1995 + A1:2000)
EN 62052-11 2003 Electricity metering equipment (a.c.) – General requirements, tests
and test conditions – Part 11: Metering equipment
(IEC 62052-11:2003)
EN 62053-31 1998 Electricity metering equipment (a.c.) – Particular requirements –
Part 31: Pulse output devices for electromechanical and electronic
meters (two wires only) (IEC 62053-31:1998)
EN 62053-52 2005 Electricity metering equipment (a.c.) – Particular requirements –
Part 52: Symbols (IEC 62053-52:2005)
EN ISO 75-2 1996 Plastics – Determination of temperature of deflection under load –
Part 2: Plastic and ebonite (ISO 75-2:1993)
HD 588.1 S1 1991 High-voltage test techniques – Part 1: General definitions and test
requirements (IEC 60060-1:1989 + corrigendum Mar. 1990)
1)
IEC 60038 1983 IEC standard voltages
+ A1 1994
+ A2 1997
International Electrotechnical Vocabulary – Electrical and electronic
IEC 60050-300 2001
measurements and measuring instruments –
Part 311: General terms relating to measurements –
Part 312: General terms relating to electrical measurements –
Part 313: Types of electrical measuring instruments –
Part 314: Specific terms according to the type of instrument
2)
IEC 60417-DB 2002 Graphical symbols for use on equipment
IEC 61000-4-6 2003 Electromagnetic compatibility (EMC) – Part 4-6: Testing and
measurement techniques – Immunity to conducted disturbances,
+ A1 2004
induced by radio-frequency fields
ISO/IEC VIM 1993 International vocabulary of basic and general terms in metrology
———————
1)
 IEC 60038:1983 (mod.) without its amendments is harmonized as HD 472 S1:1989 "Nominal voltages for low-voltage public
electricity supply systems".
2)
“DB” refers to the IEC on-line database.

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SIST EN 50470-1:2007
– 9 – EN 50470-1:2006
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
Expressions of the performance of electrical and electronic measuring equipment have been taken
from EN 60359.
Where there is a difference between the definitions in this glossary and those contained in product
standards produced by TC 13, then the latter shall take precedence in applications of the relevant
standard.
3.1 General definitions
3.1.1
electromechanical meter
meter in which currents in fixed coils react with the currents induced in the conducting moving
element, generally (a) disk(s), which causes their movement proportional to the energy to be
measured [EN 62052-11, 3.1.1]
3.1.2
static meter
meter in which current and voltage act on solid state (electronic) elements to produce an output
proportional to the energy to be measured [EN 62052-11, 3.1.2]
3.1.3
watt-hour meter
active energy meter
instrument intended to measure active energy by integrating active power with respect to time
[IEV 313-06-01]
3.1.4
direct connected meter
meter intended for use by direct connection to the electricity supply
3.1.5
transformer operated meter
meter intended for use by connection via one or more external instrument transformers to the
electricity supply
3.1.6
active power
under periodic conditions, mean value, taken over one period T, of the instantaneous power p
T
1
P = p ⋅dt
∫
T
0
NOTE 1 Under sinusoidal conditions, the active power is the real part of the complex power.
NOTE 2 The SI unit for active power is the watt.
[IEV 131-11-42]

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SIST EN 50470-1:2007
EN 50470-1:2006 – 10 –
3.1.7
apparent power
product of the r.m.s. voltage U between the terminals of a two-terminal element or two-terminal circuit
and the r.m.s. electric current I in the element or circuit:
S =U ⋅I
NOTE 1 Under sinusoidal conditions, the apparent power is the modulus of the complex power.
NOTE 2 The SI unit for apparent power is the volt-ampere.
[IEV 131-11-41]
3.1.8
active energy
the electrical energy transformable into some other form of energy [IEV 601-01-19]
3.1.9
power factor
under periodic conditions, ratio of the absolute value of the active power P to the apparent power S
P
λ =
S
NOTE Under sinusoidal conditions, the power factor is the absolute value of the active factor.
[IEV 131-11-46]
3.1.10
multi-rate meter
energy meter provided with a number of registers, each becoming operative for specified time
intervals corresponding to different tariff rates [IEV 313-06-09 modified]
3.1.11
meter type (for electromechanical meter)
a particular design of meter, manufactured by one manufacturer, having:
a) similar metrological properties;
b) the same uniform construction of parts determining these properties;
c) the same ratio of the maximum current to the reference current;
d) the same number of ampere-turns for the current winding at reference current and the same
number of turns per volt for the voltage winding at reference voltage.
The type may have several values of reference current and reference voltage.
Meters are designated by the manufacturer by one or more groups of letters or numbers, or a
combination of letters and numbers. Each type has one designation only.
NOTE 1 The type is represented by the sample meter(s) intended for the type tests, whose characteristics (reference current
and reference voltage) are chosen from the values given in the tables proposed by the manufacturer.
NOTE 2 Where the number of ampere-turns would lead to a number of turns other than a whole number, the product of the
number of turns of the windings by the value of the reference current may differ from that of the sample meter(s) representative
of the type.
It is advisable to choose the next number immediately above or below in order to
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