EN 61557-11:2009

SLOVENSKI STANDARD
01-junij-2009
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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 11:
Effectiveness of residual current monitors (RCMs) type A and type B in TT, TN and IT
systems
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen -- Teil 11:
Wirksamkeit von Differenzstrom-Überwachungsgeräten (RCMs) Typ A und Typ B in TT-,
TN- und IT-Systemen
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 11: Efficacité des contrôleurs d'isolement à courant différentiel
résiduel (RCM) de type A et de type B dans les réseaux TT, TN et IT
Ta slovenski standard je istoveten z: EN 61557-11:2009
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 61557-11
NORME EUROPÉENNE
March 2009
EUROPÄISCHE NORM
ICS 17.220.20; 29.080.01; 29.240.01

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 11: Effectiveness of residual current monitors (RCMs)
type A and type B in TT, TN and IT systems
(IEC 61557-11:2009)
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 ou Geräte zum Prüfen, Messen oder
de surveillance de mesures de protection - Überwachen von Schutzmaßnahmen -
Partie 11: Efficacité des contrôleurs Teil 11: Wirksamkeit von Differenzstrom-
d'isolement à courant différentiel résiduel Überwachungsgeräten (RCMs) Typ A
(RCM) de type A et de type B und Typ B in TT-, TN- und IT-Systemen
dans les réseaux TT, TN et IT (IEC 61557-11:2009)
(CEI 61557-11:2009)
This European Standard was approved by CENELEC on 2009-02-01. 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: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 61557-11:2009 E
Foreword
The text of document 85/338/FDIS, future edition 1 of IEC 61557-11, 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 61557-11 on 2009-02-01.
This standard is to be used in conjunction with EN 61557-1:2007.
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) 2009-11-01
– latest date by which the national standards conflicting
(dow) 2012-02-01
with the EN have to be withdrawn
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 61557-11:2009 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 60364-4-41 NOTE  Harmonized as HD 60364-4-41:2007 (modified).
IEC 60364-5-53 NOTE  Clause 534 (in IEC/A1:2002) harmonized as HD 60364-5-534:2008 (modified).
IEC 60364-6 NOTE  Harmonized as HD 60364-6:2007 (modified).
IEC 60947-2 NOTE  Harmonized as EN 60947-2:2006 (not modified).
IEC 61008-1 NOTE  Harmonized as EN 61008-1:2004 (modified).
__________
- 3 - EN 61557-11:2009
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/TR 60755 2008 General requirements for residual current - -
operated protective devices
IEC 61010-1 2001 Safety requirements for electrical EN 61010-1 2001
equipment for measurement, control, and + corr. June 2002
laboratory use -
Part 1: General requirements
1) 2)
IEC 61326-2-2 - 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) 2)
IEC 61557-1 - Electrical safety in low voltage distribution EN 61557-1 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 1: General requirements
1) 2)
IEC 61557-6 - Electrical safety in low voltage distribution EN 61557-6 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 6: Effectiveness of residual current
devices (RCD) in TT, TN and IT systems

IEC 62020 1998 Electrical accessories - Residual current EN 62020 1998
monitors for household and similar uses
(RCMs)
1)
Undated reference.
2)
Valid edition at date of issue.

IEC 61557-11 ®
Edition 1.0 2009-01
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
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 11: Effectiveness of residual current monitors (RCMs) type A and type B in
TT, TN and IT systems
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 11: Efficacité des contrôleurs d'isolement à courant différentiel résiduel
(RCM) de type A et de type B dans les réseaux TT, TN et IT

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 2-8318-1023-8
– 2 – 61557-11 © IEC:2009
CONTENTS
FOREWORD.3
1 Scope.5
2 Normative references.5
3 Terms and definitions .5
4 Requirements .7
4.1 Operating test.7
4.2 Non-operating test .8
4.3 Test of actuating time .8
4.4 Operating conditions.8
4.5 Prevention of danger by fault voltages exceeding 50 V a.c. or 120 V d.c. in the
monitored system during measurement.8
4.6 Prevention of danger caused by overvoltages when the system is connected.9
4.7 Electromagnetic compatibility (EMC) .9
5 Marking and operating instructions.9
5.1 Markings .9
5.2 Operating instructions.9
5.2.1 Information .9
5.2.2 Warnings .9
6 Tests .10
6.1 General .10
6.2 Operating uncertainty.10
Annex A (informative) Differences between RCMs and RCDs .14
Annex B (informative) Safety aspects, test methods and applications.18
Bibliography .20

Figure 1 – Maximum steepness of stepwise rising smooth direct test current (I ) .12
T
Figure 2 – Maximum increase of linearly increasing smooth direct test current (I ).12
T
Figure 3 – Example for linearly increasing smooth direct test current (I ): I = 30 mA .13
T ∆N
Figure A.1 – Typical installation with a combination of RCDs and RCMs .17

Table 1 – Calculation of operating uncertainty .11
Table A.1 – Normative reference and definition of function of RCM and RCD .14
Table A.2 – Requirements for testing RCMs according to product standard
IEC 62020:1998 .15
Table A.3 – Main technical differences between RCMs and RCDs .16

61557-11 © IEC:2009 – 3 –
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 11: Effectiveness of residual current monitors (RCMs)
type A and type B in TT, TN and IT systems

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
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