SIST EN 62058-21:2010

Electricity metering equipment (a.c.) - Acceptance inspection - Part 21: Particular requirements for electromechanical meters for active energy (classes 0,5, 1 and 2 and class indexes A and B) (IEC 62058-21:2008, modified)

This part of IEC 62058 specifies particular requirements for acceptance inspection of newly manufactured direct connected or transformer operated electromechanical meters for active energy (classes 0,5, 1 and 2) delivered in lots in quantities above 50. The method of acceptance of smaller lots should be agreed upon by the manufacturer and the customer. The process described herein is primarily intended for acceptance inspection between the manufacturer and the purchaser.

Wechselstrom-Elektrizitätszähler - Annahmeprüfung - Teil 21: Besondere Anforderungen an elektromechanische Zähler für Wirkenergie (Klassen 0,5, 1 und 2 und Klassenzeichen A und B) (IEC 62058-21:2008, modifiziert)

Equipement de comptage de l'électricité (a.c.) - Contrôle de réception - Partie 21: Exigences particulières pour compteurs électromécaniques d'énergie active (classes 0,5, 1 et 2 et indices de classe A et B) (CEI 62058-21:2008, modifiée)

La CEI 62058-21:2008 définit les exigences particulières pour les contrôles de réception des compteurs électromécaniques de construction récente d'énergie active à branchement direct ou alimentés par transformateur (de classes 0,5, 1 et 2) livrés en lots de plus de 50. Il convient que la méthode de réception pour des lots plus petits fasse l'objet d'un accord entre le fabricant et le client.

Merjenje električne energije (a.c.) - Sprejemna kontrola - 21. del: Posebne zahteve za elektromehanske števce delovne energije (razredi 0,5, 1 in 2 ter razredni indeksi A in B) (IEC 62058-21:2008, spremenjen)

Ta del IEC 62058 določa posebne zahteve za sprejemno kontrolo na novo izdelanih neposredno priključenih ali z transformatorjem upravljanih elektromehanskih števcev delovne energije (razred 0.5, 1 in 2), dobavljenih v pošiljkah 50 kosov ali več. Sprejemna metoda za manjše pošiljke mora biti dogovorjena s strani proizvajalca in stranke. Proces, opisan v nadaljnjem besedilu, je prvotno namenjen za sprejemno kontrolo med proizvajalcem in kupcem.

General Information

• Status: Published
• Publication Date: 13-Jul-2010
• 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: 30-Jun-2010
• Due Date: 04-Sep-2010
• Completion Date: 14-Jul-2010
• Directive: 2004/22/EC - Directive 2004/22/EC of the European Parliament and of the Council of 31 March 2004 on measuring instruments
• Directive: 2014/32/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/347 - Programming mandate to CEN, CENELEX and ETSI relating to measuring instruments
• Ref Project: EN 62058-21:2010 - Electricity metering equipment (a.c.) - Acceptance inspection - Part 21: Particular requirements for electromechanical meters for active energy (classes 0,5, 1 and 2 and class indexes A and B)

Relations

• Replaces: SIST EN 60514:1995 - Acceptance inspection of Class 2 alternating-current watthour meters
• Effective Date: 01-Sep-2010
• Replaces: SIST EN 60514:1995 - Acceptance inspection of Class 2 alternating-current watthour meters
• Effective Date: 29-Jan-2023
• Revised: SIST EN 60514:1995 - Acceptance inspection of Class 2 alternating-current watthour meters
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 62058-21:2010
01-september-2010
1DGRPHãþD
SIST EN 60514:1995
0HUMHQMHHOHNWULþQHHQHUJLMHDF6SUHMHPQDNRQWURODGHO3RVHEQH]DKWHYH
]DHOHNWURPHKDQVNHãWHYFHGHORYQHHQHUJLMHUD]UHGLLQWHUUD]UHGQLLQGHNVL
$LQ%,(&VSUHPHQMHQ
Electricity metering equipment (a.c.) - Acceptance inspection - Part 21: Particular
requirements for electromechanical meters for active energy (classes 0,5, 1 and 2 and
class indexes A and B) (IEC 62058-21:2008, modified)
Wechselstrom-Elektrizitätszähler - Annahmeprüfung - Teil 21: Besondere Anforderungen
an elektromechanische Zähler für Wirkenergie (Klassen 0,5, 1 und 2 und Klassenzeichen
A und B) (IEC 62058-21:2008, modifiziert)
Equipement de comptage de l'électricité (a.c.) - Contrôle de réception - Partie 21:
Exigences particulières pour compteurs électromécaniques d'énergie active (classes 0,5,
1 et 2 et indices de classe A et B) (CEI 62058-21:2008, modifiée)
Ta slovenski standard je istoveten z: EN 62058-21:2010
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 62058-21:2010 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 62058-21:2010

---------------------- Page: 2 ----------------------

SIST EN 62058-21:2010

EUROPEAN STANDARD
EN 62058-21

NORME EUROPÉENNE
June 2010
EUROPÄISCHE NORM

ICS 17.220; 91.140.50 Supersedes EN 60514:1995 (partially)


English version


Electricity metering equipment (a.c.) -
Acceptance inspection -
Part 21: Particular requirements for electromechanical meters for active
energy (classes 0,5, 1 and 2 and class indexes A and B)
(IEC 62058-21:2008, modified)


Equipement de comptage  Wechselstrom-Elektrizitätszähler -
de l'électricité (a.c.) - Annahmeprüfung -
Contrôle de réception - Teil 21: Besondere Anforderungen
Partie 21: Exigences particulières an elektromechanische Zähler
pour compteurs électromécaniques für Wirkenergie (Klassen 0,5, 1 und 2
d'énergie active (classes 0,5, 1 et 2 und Klassenzeichen A und B)
et indices de classe A et B) (IEC 62058-21:2008, modifiziert)
(CEI 62058-21:2008, modifiée)




This European Standard was approved by CENELEC on 2010-06-01. 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, 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, 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

Management Centre: Avenue Marnix 17, B - 1000 Brussels


© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 62058-21:2010 E

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SIST EN 62058-21:2010
EN 62058-21:2010 - 2 -
Foreword
The text of document 13/1431/FDIS, future edition 1 of IEC 62058-21, prepared by IEC TC 13, Electrical
energy measurement, tariff- and load control, was submitted to the IEC-CENELEC parallel vote.
A draft amendment, prepared by the Technical Committee CENELEC TC 13, Equipment for electrical
energy measurement and load control, was submitted to the formal vote.
The combined texts were approved by CENELEC as EN 62058-21 on 2010-06-01.
EN 62058-21:2010, together with EN 62058-11:2010, supersedes EN 60514:1995.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
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) 2011-06-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-06-01
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 Directive 2004/22/EC. See Annex ZZ.
Annexes ZA and ZZ have been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 62058-11:2008 was approved by CENELEC as a European
Standard with agreed common modifications as given below.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 62052-11:2003 NOTE  Harmonized as EN 62052-11:2003 (not modified).
IEC 62053-11:2003 NOTE  Harmonized as EN 62053-11:2003 (not modified).

COMMON MODIFICATIONS

Title
Replace the title of EN 62058-21 by the following:
Electricity metering equipment (a.c.) - Acceptance inspection - Part 21: Particular requirements for
electromechanical meters for active energy (classes 0,5, 1 and 2 and class indexes A and B)
Scope
Add the following text at the end of Clause 1:
This European standard applies to meters of accuracy classes 0,5, 1 and 2, as well as to meters of class
indexes A and B.

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SIST EN 62058-21:2010
- 3 - EN 62058-21:2010
Normative references
Add the following references:
Publication Year Title
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)
EN 50470-2 2006 Electricity metering equipment (a.c.) - Part 2: Particular requirements -
Electromechanical meters for active energy (class indexes A and B)
4 Test conditions
4.2 Reference conditions
Add the following text at the end of 4.2:
For meters of class index A and B, the values in Table 1 and Table 2, specified for meters of class 2 and
class 1 apply respectively.
5 Inspection procedure
5.1 Test to be performed and inspection methods
Add the following text above 5.2:
See also EN 62058-11, 5.5.
5.2 Preliminary tests and pre-conditioning
Add the following text above 5.3:
For meters of class indexes A and B, the value of the current shall be I .
tr
5.4 Test No. 2: Test of no-load condition
Add the following text after the Note:
The value of the test current for meters of class indexes A and B shall be 0,01 I .
tr
5.5 Test No. 3: Starting
Add the following text and table after Table 6:
For meters of class index A and B, instead of the values of Table 6, the values of Table Z1 apply:
Table Z1 – Value of current for starting test for meters of class index A and B
Meters for Meters of class index Power factor
A B
0,05 I 0,04 I
Direct connection 1
tr tr
Connection through current 0,06 I 0,04 I 1
tr tr
transformers
5.6 Tests No. 4…9: Accuracy tests
Add the following text and tables after Table 7:
For meters of class index A and B, instead of the values of the values of Table 7, the values of Table Z2
apply:

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SIST EN 62058-21:2010
EN 62058-21:2010 - 4 -
Table Z2 – Accuracy test points and limits of errors for meters of class index A and B
Value of current for direct Load Percentage error limits for
Applicable
connected and Power (in case of for meters of class index
Test No. for meter
transformer operated factor polyphase
type
A B
meters meters)
Single-
I
4 min 1 and Balanced ± 2,5 ± 1,5
polyphase
Single-
5 10 I 1 and Balanced ± 2,0 ± 1,0
tr
polyphase
Single-
6 10 I 0,5 and Balanced ± 2,0 ± 1,0
tr
polyphase
Single
7 10 I 1 Polyphase ± 3,0 ± 2,0
a
tr
phase
Single
8 10 I 1 Polyphase b ± 3,0 ± 2,0
tr
phase
Single-
9 I 1 and Balanced ± 2,0 ± 1,0
max
polyphase
a
The meter shall be supplied with three phase symmetrical voltage. The current shall be
applied to any of the phases.
b
 The meter shall be supplied with three phase symmetrical voltage. The current shall be
applied to a phase different from the phase in test 7.
The values of Table Z2 are taken from EN 50470-2, Table 4 and Table 5, Percentage error limits at
reference conditions.
To ensure that the requirements of EN 50470-2, Table 8, Maximum Permissible Error (MPE), are also
met, and with this the essential requirements of the MID are met, the actual percentage error limits to be
used during conformity assessment shall be established using the method described below.
For each test point, the values of variation of percentage error due to temperature, voltage and frequency
variation, established during type testing, shall be subtracted from the MPE using the formula:
2 2 2 2
e (I,cosϕ )= MPE −δ (T ,I,cosϕ )−δ (U,I,cosϕ )−δ (f ,I,cosϕ )
calc Type Type Type
where:
e (I,cosϕ ) is the value of calculated limit of percentage error under reference conditions;
calc
MPE is the value of maximum permissible error taken from EN 50470-2, Table 8, for the
given test point;
δ (T ,I,cosϕ ) is the value of the variation of percentage error due to variation of temperature,
Type
established during type testing;
δ (U,I,cosϕ ) is the value of the variation of percentage error due to variation of voltage,
Type
established during type testing;
δ (f ,I,cosϕ ) is the value of the variation of percentage error due to variation of frequency,
Type
established during type testing.
The actual limit of percentage error to be applied for each test point shall be the lesser of the value shown
in Table Z1, and the value e (I,cosϕ ) calculated as described above.
calc
An eventual correction of the percentage error limits, due to uncertainty of the measurement of
percentage error as described in 4.3, also applies.

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SIST EN 62058-21:2010
- 5 - EN 62058-21:2010
During manufacturing, the values of the variation of percentage error due to temperature, voltage and
frequency variation shall be established in adequate intervals to ensure that they are essentially same as
established during type testing.
EXAMPLE:
A meter of class index A, manufactured for the temperature range of 5 °C to 30 °C is tested.
The columns of Table Z3 show the following:
- column 1: the number of test, as identified in Table Z1;
- column 2: the values of the mpe, taken from EN 50470-2, Table 8;
- column 3: the values of temperature variation, established during the type test;
- column 4: the values of voltage variation, established during the type test;
- column 5: the values of frequency variation, established during the type test;
- column 6: the calculated values of percentage error limits;
- column 7: the percentage error limits taken from Table Z2.
Table Z3 – Example for determining the percentage error limits to be applied
Tes
MP δ (T ,I,cosϕ ) δ (U,I,cosϕ ) δ (f ,I,cosϕ )
e (I,cosϕ ) e(I,cosϕ )
Type Type Type
calc
t
E

No.

4 ±
± 2,5
3,5 + 0,5 - 0,2 + 0,1 ± 3,46
5 ±
± 2,0
3,5 + 0,3 - 0,2 + 0,1 ± 3,48
6 ±
± 2,0
3,5 + 0,5 - 0,2 + 0,1 ± 3,46
7 ±
± 3,0
4,0 + 0,4 - 0,2 + 0,1 ± 3,97
8 ±
± 3,0
4,0 + 0,4 - 0,2 + 0,1 ± 3,97
9 ±
± 2,0
3,5 + 0,3 - 0,2 + 0,1 ± 3,48
As the values of e(I,cosϕ ) , taken from Table Z2 are smaller than the values e (I,cosϕ ) calculated
calc
from the MPE taking into account the values of variation of percentage error due to temperature, voltage
and frequency variation, established during type testing, the values e(I,cosϕ )of Table Z2 shall be
used.
If the meter is intended for a wider temperature range, then the calculation has to be performed for each
temperature range, and the smallest percentage error limits – out of all the calculated values
e (I,cosϕ ) and the valuese(I,cosϕ ) of Table Z2 – shall be used.
calc

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SIST EN 62058-21:2010
EN 62058-21:2010 - 6 -
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications

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.

NOTE  When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.

Publication Year Title EN/HD Year

IEC 62058-11 2008 Electricity metering equipment (AC) - EN 62058-11 2010
Acceptance inspection -
Part 11: General acceptance inspection
methods


ISO/IEC Guide 98 1995 Guide to the expression of uncertainty in - -
measurement (GUM)

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SIST EN 62058-21:2010
- 7 - EN 62058-21:2010
Annex ZZ
(informative)

Coverage of Essential Requirements of the EC Directives
This European Standard has been prepared under the mandate M/374 given to CENELEC by the
European Commission and within its scope, the standard covers methods for statistical verification of
conformity with the metrological requirements in connection the Modules F, D and H1.
EN 62058-11 specifies sampling plans, schemes and systems for lot-by-lot inspection by attributes or
variables. In addition, a test procedure for 100 % inspection is specified, that can be used if the lot size is
too small for sampling inspection or when sampling inspection has to be discontinued.
Considering the Part 11, EN 62058-21 specifies particular requirements for electromechanical electricity
meters, including the tests to be performed, the sampling plans applicable and the performance criteria.
Table ZZ.1 provides the relationship between the Essential requirements of the MID and the stipulations
of the EN 62058 series.
Compliance with this standard provides one means of conformity with the specified essential
requirements of the Directives concerned.
WARNING: Other requirements and other EC Directives may be applicable to the products falling within
the scope of this standard.

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SIST EN 62058-21:2010
EN 62058-21:2010 - 8 -
Table ZZ.1 – Relationship between the Essential requirements of the MID
and the stipulations of the relevant standards
MID Annex I Subject EN 62058-11 EN 62058-21 EN 62058-31
 NOTE The text in this column is
for orientation. For the full text see
the MID.
1 Allowable Errors

1.1 Under rated operating conditions 5.6 Accuracy 5.6 Accuracy
and in the absence of disturbance tests, Table tests, Table
Z2 Z2
–
5.7 5.7
Verification of Verification of
the register the register
1.2 Under rated operating conditions
– – –
and in the presence of disturbance
1.3 Climatic, mechanical and EM
environment and other influence
– – –
quantities to be specified by the
manufacturer
1.3.1 Climatic environments, upper and
– – –
lower temperature limit
1.3.2 Mechanical environments,
– – –
vibration and shock
1.3.3 Electromagnetic environments,
unless otherwise laid down in the
– – –
appropriate instrument-specific
annexes.
1.3.4 Other influence quantities – – –
1.4 Carrying out the tests – – –
1.4.1 Basic rules for testing and 5.6, 5.6,
–
determination of errors Accuracy test Accuracy test
1.4.2 Ambient humidity – – –
2 Reproducibility – – –
3 Repeatability – 4.3 4.3
4 Discrimination and Sensitivity – – –
5 Durability – – –
6 Reliability – – –
7 Suitability 5.3 5.3
AC voltage AC voltage
test test
7.1 No feature likely to facilitate
fraudulent use, possibilities for – – –
unintentional misuse minimal
7.2 Suitable for intended use under
practical working conditions, no – – –
unreasonable demand of the user

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SIST EN 62058-21:2010
- 9 - EN 62058-21:2010
MID Annex I Subject EN 62058-11 EN 62058-21 EN 62058-31
7.3 Errors of a utility measuring
instrument at flows or currents
– – –
outside the controlled range not
unduly biased.
7.4 When the measurand is constant
over time, the measuring
instrument shall be insensitive to
N.A. N.A. N.A.
small fluctuations of the value of
the measurand, or shall take
appropriate action.
7.5 Robust and materials of
construction suitable for the – – –
intended use conditions.
7.6 Designed so as to allow the control
of the measuring tasks after the
instrument has been placed on the
market and put into use.
Software that is critical for the
– – –
metrological characteristics
identifiable.
Metrological characteristics not
inadmissibly influenced by the
associated software.
8 Protection against corruption – – –
8.1 Metrological characteristics not
influenced in any inadmissible way
by the connection to it of another
device, by any feature of the – – –
connected device itself or by any
remote device that communicates
with the measuring instrument.
8.2 Hardware component critical for
metrological characteristics
designed so that it can be secured.
– – –
Security measures to provide
evidence of an intervention.
Software that is critical for metrological
8.3
characteristics shall be identified as such
and shall be secured.

– – –
Software identification.
Evidence of an intervention available for
a reasonable period of time.
Measurement data, critical software and
8.4
metrologically important parameters
stored or transmitted adequately – – –
protected against accidental or
intentional corruption.
For utility measuring instruments the
8.5
display of the total quantity supplied or
the displays from which the total quantity
supplied can be derived, whole or partial – – –
reference to which is the basis for
payment, shall not be able to be reset
during use.

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SIST EN 62058-21:2010
EN 62058-21:2010 - 10 -
MID Annex I Subject EN 62058-11 EN 62058-21 EN 62058-31
Information to be borne by and to
9
– – –
accompany the instrument
9.1 Shall bear the following
inscriptions:
- manufacturers mark or name;
- information in respect of
accuracy.
When applicable:
- information in respect of the
conditions of use;
– 5.2 5.2
- measuring capacity;
- measuring range;
- identity marking;
- number of the EC-type examination
certificate or the EC design
examination certificate;
- information whether or not additional
devices providing metrological
results comply with the provisions of
this Directive on legal metrological
control.
9.2 For too small instruments, marking
on packaging and in any N.A. N.A. N.A.
accompanying documents
9.3 Accompanying information on
- operation
and where relevant
- rated operating conditions;
- mechanical and
electromagnetic environment
classes;
- the upper and lower
temperature limit, whether
condensation is possible or
– – –
not, open or closed location;
- instructions for installation,
maintenance, repairs,
permissible adjustments;
- instructions for correct
operation and any special
conditions of use;
- conditions for compatibility with
interfaces, sub-assemblies or
measuring instruments.
9.4 Utility meters do not require
– – –
individual instruction manuals.
9.5 Decimal scale interval – – –
9.6 Material measure N.A. N.A. N.A.
9.7 Units of measurement and
symbols in accordance with – – –
Community legislation
9.8 Marks and inscriptions clear, non-
erasable, unambiguous and non- – – –
transferable.

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SIST EN 62058-21:2010
- 11 - EN 62058-21:2010
MID Annex I Subject EN 62058-11 EN 62058-21 EN 62058-31
10 Indication of result – – –
10.1 Display or hard copy N.A. N.A. N.A.
10.2 Indication of result clear and
N.A. N.A. N.A.
unambiguous. Easy reading.
10.3 Hard copy easily legible and not
N.A. N.A. N.A.
erasable
10.4 Direct sales trading transactions N.A. N.A. N.A.
Fitted with a metrologically controlled
10.5
display accessible without tools to the
consumer.
5.7 5.7 5.7

Verification of Verification of Verification of
the register the register the register
The reading of this display is the
measurement result that serves as the
basis for the price to pay.
11 Further processing of data to
N.A. N.A. N.A.
conclude the trading transaction
11.1 Durable record of the
measurement result (other than N.A. N.A. N.A.
utility meter)
11.2 Durable proof of the measurement
N.A. N.A. N.A.
result
12 Conformity evaluation
Designed so as to allow ready
evaluation of its conformity with
– – –
the appropriate requirements of
this Directive.

Annex MI- ACTIVE ELECTRICAL ENERGY

003 METERS
1 Accuracy – – –
2 Rated operating conditions – – –
3 MPEs 5.6 Accuracy 5.6 Accuracy
tests, Table tests, Table
Z2 Z2

5.7 5.7
Verification of Verification of
the register the register
4 Permissible effect of disturbances – – –
4.1 General – Special EM environment – – –
4.2 Effect of disturbances of long
– – –
duration
Reversed phase sequence
 – – –
Voltage unbalance (only applicable to

– – –
polyphase meters)
Harmonic contents in the current circuits
 – – –
DC and harmonics in the current circuit
 – – –
Fast transient bursts
 – – –

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SIST EN 62058-21:2010
EN 62058-21:2010 - 12 -
MID Annex I Subject EN 62058-11 EN 62058-21 EN 62058-31
Magnetic fields
 – – –
HF (radiated RF) electromagnetic field;
 – – –
 Conducted disturbances
introduced by radio-frequency – – –
fields
 Oscillatory waves immunity – – –
4.3 Permissible effect of transient
– – –
electromagnetic phenomena
4.3.1 Behavior during and immediately
after a disturbance
– – –
Recovery
Critical change value
4.3.2 Critical change value for
– – –
overcurrent
5 Suitability
Measurement error below the rated
5.1
– – –
operating voltage
5.2 Display of total energy
- sufficient number of digits – – –
- not resettable during use
5.3 Retain energy register reading for
– – –
4 months
5.4 Running with no load 5.4 Test of 5.4 Test of
– no-load no-load
condition condition
5.5 Starting 5.5 Starting, 5.5 Starting,
–
Table Z1 Table Z1
6 Units – – –
7 Putting into use – – –
 CONFORMITY ASSESSMENT Specifies
100% testing
B + F or B + D or H1.
and sampling
inspection
– –
methods to
support
modules F, D
and H1

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SIST EN 62058-21:2010
IEC 62058-21
Edition 1.0 2008-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE


Electricity metering equipment (AC) – Acceptance inspection –
Part 21: Particular requirements for electromechanical meters for active energy
(classes 0,5, 1 and 2)

Equipement de comptage de l’électricité (c.a.) – Contrôle de réception –
Partie 21: Exigences particulières pour compteurs électromécaniques d'énergie
active (classes 0,5, 1 et 2)

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
N
CODE PRIX
ICS 17.220; 91.140.50 ISBN 2-8318-9991-5
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

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SIST EN 62058-21:2010
– 2 – 62058-21 © IEC:2008
CONTENTS
FOREWORD.3
INTRODUCTION.5
1 Scope.6
2 Normative references .6
3 Terms, definitions, symbols and abbreviations.6
4 Test conditions .6
4.1 Place of inspection .6
4.2 Reference conditions.6
4.3 Uncertainty of measurement of percentage error .8
4.4 Cover and seal .9
5 Inspection procedure .9
5.1 Tests to be performed and inspection methods.9
5.2 Preliminary tests and pre-conditioning.10
5.3 Test No. 1: AC voltage test.10
5.4 Test No. 2: Test of no-load condition .11
5.5 Test No. 3: Starting .11
5.6 Tests No. 4 to 9: Accuracy tests .11
5.7 Test No. 10: Verification of the register .12
5.8 Other tests .12
6 Criteria for lot acceptance non-acceptance, disposal of unacceptable lots .12
7 Test record and evaluation .13
Bibliography.15

Table 1 – Voltage and current unbalance for polyphase meters .6
Table 2 – Reference conditions.7
Table 3 – Percentage error limits corrected with uncertainty .9
Table 4 – Acceptance tests and inspection methods .10
Table 5 – AC voltage test.11
Table 6 – Value of current for starting test .11
Table 7 – Accuracy test points and limits of percentage error .12
Table 8 – Inspection sheet.14

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SIST EN 62058-21:2010
62058-21 © IEC:2008 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICITY METERING EQUIPMENT (AC) –
ACCEPTANCE INSPECTION –

Part 21: Particular requirements for electromechanical meters
for active energy (classes 0,5, 1 and 2)


FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpr
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