SIST EN 61557-1:2007

SLOVENSKI STANDARD
SIST EN 61557-1:2007
01-september-2007
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Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or monitoring of protective measures -- Part 1: General
requirements
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen -- Teil 1:
Allgemeine Anforderungen
Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1
500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de
protection -- Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 61557-1:2007
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
SIST EN 61557-1:2007 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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EUROPEAN STANDARD
EN 61557-1

NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM

ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-1:1997


English version


Electrical safety in low voltage distribution systems
up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or monitoring
of protective measures -
Part 1: General requirements
(IEC 61557-1:2007)


Sécurité électrique dans les réseaux  Elektrische Sicherheit
de distribution basse tension in Niederspannungsnetzen
de 1 000 V c.a. et 1 500 V c.c. - bis AC 1 000 V und DC 1 500 V -
Dispositifs de contrôle, de mesure Geräte zum Prüfen,
ou de surveillance de mesures Messen oder Überwachen
de protection - von Schutzmaßnahmen -
Partie 1: Exigences générales Teil 1: Allgemeine Anforderungen
(CEI 61557-1:2007) (IEC 61557-1:2007)



This European Standard was approved by CENELEC on 2007-03-01. 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, 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


© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61557-1:2007 E

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EN 61557-1:2007 - 2 -
Foreword
The text of document 85/290/FDIS, future edition 2 of IEC 61557-1, prepared by IEC TC 85, Measuring
equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 61557-1 on 2007-03-01.
This European Standard supersedes EN 61557-1:1997.
The following changes were made with respect to EN 61557-1:1997:
– revision of the definitions;
– addition of influence quantities E and E ;
9 10
– the subclause on Electromagnetic compatibility was complemented;
– inclusion of performance monitoring devices in the introduction;
– addition of new requirements for operating instructions.
This Part 1 specifies the general requirements. Parts 2 to 8 of EN 61557, which are to be used in
conjunction with this Part 1, comprise specific specifications for individual measuring equipment.
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) 2007-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61557-1:2007 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 60359 NOTE  Harmonized as EN 60359:2002 (not modified).
IEC 60364-6 NOTE  Harmonized as HD 60364-6:2007 (modified).
IEC 61326-1 NOTE  Harmonized as EN 61326-1:2006 (not modified).
__________

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- 3 - EN 61557-1:2007
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

1)
IEC 60038 (mod) 1983 IEC standard voltages HD 472 S1 1989
- - + corr. February 2002
- - A1 1995
A1 1994
A2 1997


IEC 60364-6 (mod) 2006 Low voltage electrical installations - HD 60364-6 2007
Part 6: Verification


2) 3)
IEC 60664-1 - Insulation coordination for equipment within EN 60664-1 2003
low-voltage systems -
Part 1: Principles, requirements and tests


IEC 60529 1989 Degrees of protection provided by enclosures EN 60529 1991
 (IP Code) + corr. May 1993
A1 1999 A1 2000


IEC 61010-1 2001 Safety requirements for electrical equipment EN 61010-1 2001
for measurement, control, and laboratory + corr. June 2002
use -
Part 1: General requirements


4)
IEC 61010-2-030 200X Safety requirements for electrical equipment - -
for measurement, control and laboratory use -
Part 2-030: Particular requirements for testing
and measuring circuits


IEC 61326-2-2 2005 Electrical equipment for measurement, EN 61326-2-2 2006
control and laboratory use - EMC
requirements -
Part 2-2: Particular requirements - Test
configurations, operational conditions and
performance criteria for portable test,
measuring and monitoring equipment used in
low-voltage distribution systems



1)
The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems.
2)
Undated reference.
3)
Valid edition at date of issue.
4)
To be published.

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EN 61557-1:2007 - 4 -
Publication Year Title EN/HD Year
IEC 61326-2-4 2006 Electrical equipment for measurement, EN 61326-2-4 2006
control and laboratory use - EMC
requirements -
Part 2-4: Particular requirements - Test
configurations, operational conditions and
performance criteria for insulation monitoring
devices according to IEC 61557-8 and for
equipment for insulation fault location
according to IEC 61557-9


2) 3)
IEC 61557-2 - Electrical safety in low voltage distribution EN 61557-2 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 2: Insulation resistance


2) 3)
IEC 61557-3 - Electrical safety in low voltage distribution EN 61557-3 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 3: Loop impedance


2) 3)
IEC 61557-4 - Electrical safety in low voltage distribution EN 61557-4 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 4: Resistance of earth connection and
equipotential bonding


2) 3)
IEC 61557-5 - Electrical safety in low voltage distribution EN 61557-5 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 5: Resistance to earth


4) 5)
IEC 61557-6 - Electrical safety in low voltage distribution EN 61557-6 200X
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 6: Effectiveness of residual current
devices (RCD) in TT, TN and IT systems


2) 3)
IEC 61557-7 - Electrical safety in low voltage distribution EN 61557-7 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 7: Phase sequence


2) 5)
IEC 61557-8 - Electrical safety in low voltage distribution EN 61557-8 200X
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 8: Insulation monitoring devices for IT
systems



5)
To be ratified.

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- 5 - EN 61557-1:2007
Publication Year Title EN/HD Year
2) 3)
IEC 61557-9 - Electrical safety in low voltage distribution EN 61557-9 1999
systems up to 1 kV a.c. and 1,5 kV d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 9: Equipment for insulation fault location
in IT systems


2) 3)
IEC 61557-10 - Electrical safety in low voltage distribution EN 61557-10 2001
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 10: Combined measuring equipment for
testing, measuring or monitoring of protective
measures

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NORME CEI
INTERNATIONALE
IEC



61557-1
INTERNATIONAL


Deuxième édition
STANDARD

Second edition

2007-01


Sécurité électrique dans les réseaux
de distribution basse tension de 1 000 V c.a.
et 1 500 V c.c. –
Dispositifs de contrôle, de mesure ou de
surveillance de mesures de protection –

Partie 1: Exigences générales

Electrical safety in low voltage distribution
systems up to 1 000 V a.c. and 1 500 V d.c. –
Equipment for testing, measuring
or monitoring of protective measures –

Part 1: General requirements


© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved
Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any
utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including
électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from
microfilms, sans l'accord écrit de l'éditeur. the publisher.
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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch
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МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue

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61557-1 © IEC:2007 – 3 –
CONTENTS
FOREWORD.5
INTRODUCTION.9

1 Scope.11
2 Normative references.11
3 Terms and definitions .13
4 Requirements .21
4.1 Operating uncertainty (B), percentage operating uncertainty (B [%]) .23
4.2 Rated operating conditions .25
4.3 Battery check facility.25
4.4 Terminals .25
4.5 Class of protection.25
4.6 Class of pollution .25
4.7 Overvoltage category.25
4.8 Measuring category .25
4.9 Electromagnetic compatibility.27
4.10 Vibration test .27
5 Marking and operating instructions.27
5.1 Marking .27
5.2 Operating instructions.29
6 Tests .29
6.1 Influence of position.29
6.2 Influence of temperature.29
6.3 Influence of the supply voltage.31
6.4 Battery check facility.31
6.5 Protection class .31
6.6 Terminals .31
6.7 Mechanical requirements .31
6.8 Marking and operating instructions.31

Bibliography .33

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61557-1 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
UP TO 1 000 V a.c. AND 1 500 V d.c. –
EQUIPMENT FOR TESTING, MEASURING OR MONITORING
OF PROTECTIVE MEASURES –

Part 1: General requirements

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
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence
between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
the latter.
5) IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with an IEC Publication.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61557-1 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This second edition replaces and cancels the first edition published in 1997. It constitutes a
technical revision.
The following changes were made with respect to the previous edition:
a) revision of the definitions
b) addition of influence quantities E and E
9 10
c) the subclause on Electromagnetic compatibility was complemented
d) inclusion of performance monitoring devices in the introduction
e) addition of new requirements for operating instructions

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61557-1 © IEC:2007 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
85/290/FDIS 85/300/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts of the IEC 61557 series, published under the general title Electrical safety in
low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. – Equipment for testing,
measuring or monitoring of protective measures, can be found on the IEC website.
This Part 1 specifies the general requirements. Parts 2 to 8 of IEC 61557, which are to be used
in conjunction with this Part 1, comprise specific specifications for individual measuring
equipment.
The committee has decided that the contents of this publication will remain unchanged until the
maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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61557-1 © IEC:2007 – 9 –
INTRODUCTION
IEC 60364-6:2006, stipulates standardized conditions for the initial test of power installations in
TN, TT or IT (IEC 60364) systems, for continuous monitoring and for testing these installations
after modifications. In addition to general references for the execution of the tests,
IEC 60364-6 contains requirements which have to be verified by measurement. Only in a few
instances, for example when measuring the insulation resistance, the standard contains details
of the characteristics of the measuring device to be used. Circuits which are given as examples
in IEC 60364-6, and referred to within the text, are generally not suitable for practical use.
The tests are carried out in installations where hazardous voltages can occur and where
careless use or a defect in the equipment can easily cause an accident. Therefore, the
technician has to rely on measuring devices which ensure, apart from simplification of the
measurements, safe test methods.
The application of the general safety regulations for electrical and electronic measuring devices
(IEC 61010-1) for testing the protective measures is not sufficient in itself. The execution of
measurements in the installation can cause hazards not only to the technician, but, depending
on the measuring method, also to third persons.
Likewise, reliable and comparable results of measurement with measuring devices from
different manufacturers are an important precondition in order to obtain an objective judgement
about the installation, for example when the installation is handed over for periodic tests, for
continuous insulation monitoring or in the case of performance warranty.
This series of standards has been established with the aim of stipulating common principles for
measuring and monitoring equipment for testing electrical safety and measuring performances in
systems with nominal voltages up to 1 000 V a.c. and 1 500 V d.c. which correspond to the
above-mentioned characteristics.
For this reason, the following common specifications have been stipulated in Part 1 and other
individual parts of the series of standards:
– protection against extraneous voltages;
– protection class II (except insulation monitoring devices);
– specifications and safety precautions against hazardous touch voltages at the measuring
device;
– specifications for the judgement of connection configurations with respect to wiring errors
in the tested equipment;
– special mechanical requirements;
– measuring methods;
– measured quantity;
– specification of the maximum operating uncertainty;
– specifications for testing the influencing quantity and the calculation of the operational
uncertainty;
– uncertainties of the measuring device at the thresholds specified in the respective
standards;
– specification of the nature of type and routine tests and the required conditions for testing.

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61557-1 © IEC:2007 – 11 –
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION SYSTEMS
UP TO 1 000 V a.c. AND 1 500 V d.c. –
EQUIPMENT FOR TESTING, MEASURING OR MONITORING OF
PROTECTIVE MEASURES –

Part 1: General requirements

1 Scope
This part of IEC 61557 specifies the general requirements for measuring and monitoring
equipment for testing the electrical safety in low voltage distribution systems with nominal
voltages up to 1 000 V a.c. and 1 500 V d.c.
When measuring equipment or measuring installations involve measurement tasks of various
measuring equipment covered by this series of standards, then the part of this series of
standards relevant to each of the measurement tasks is applicable.
NOTE The term "measuring equipment" will hereafter be used to designate "testing, measuring and monitoring
equipment".
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.
1)
IEC 60038:1983 , IEC standard voltages
Amendment 1: 1994
Amendment 2: 1997
IEC 60364-6:2006, Electrical installations of buildings – Part 6: Verification
IEC 60664-1, Insulation coordination for equipment within low-voltage systems - Part 1:
Principles, requirements and tests
IEC 60529: 2001, Degrees of protection provided by enclosures (IP code)
IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 1: General requirements
IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and
2)
laboratory use – Part 2-030: Special requirements for testing and measuring circuits
IEC 61326-2-2:2005, Electrical equipment for measurement, control and laboratory use – EMC
requirements – Part 2-2: Particular requirements – Test configurations, operational conditions
and performance criteria for portable test, measuring and monitoring equipment used in low-
voltage distribution systems
––––––––
1)
 There exists a consolidated edition (6.2), which includes IEC 60038:1983 and its Amendments 1 (1994) and 2
(1997).
2)
 To be published.

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61557-1 © IEC:2007 – 13 –
IEC 61326-2-4:2006, Electrical equipment for measurement, control and laboratory use, - EMC
requirements - Part 2: Particular requirements – Test configurations, operational conditions and
performance criteria for insulation monitoring devices according to IEC 61557-8 and for

equipment for insulation fault location according to IEC 61557-9
IEC 61557-2, Electrical safety in low voltage distribution systems up to 1000 V a.c.
and 1500 V d.c. – Equipment for testing, measuring or monitoring of protective measures –
Part 2: Insulation resistance
IEC 61557-3, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 3: Loop
impedance
IEC 61557-4, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 4:
Resistance of earth connection and equipotential bonding
IEC 61557-5, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 5:
Resistance to earth
IEC 61557-6, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 6: Residual
current devices (RCD) in TT and TN systems
IEC 61557-7, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 7: Phase
sequence
IEC 61557-8, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation
monitoring devices for IT systems
IEC 61557-9, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V
d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 9:
Equipment for insulation fault location in IT systems
IEC 61557-10, Electrical safety in low voltage distribution systems up to 1000 V a.c. and
1500 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 10:
Combined measuring equipment for testing, measuring or monitoring of protective measures
3 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1
nominal voltage of the distribution system (U )
n
voltage by which a distribution system or equipment is designated and to which certain
operating characteristics are referred
[IEC 60038, Clause 1, modified]

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61557-1 © IEC:2007 – 15 –
3.2
operating voltage in a system
the value of the voltage under normal conditions, at a given instant and a given point of the
system
[IEV 601-01-22, modified]
3.3
voltage against earth
U
o
a) in distribution systems with an earthed neutral point, the voltage between a phase conductor
and the earthed neutral point;
b) in all other distribution systems, the voltage present between the remaining phase
conductors and earth when one of the ph
...