EN 62058-21:2010

SLOVENSKI STANDARD
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
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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
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.
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.
- 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:
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.

- 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
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)
- 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 f
...