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IEC 61557-11
Edition 2.0 2020-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical safety in low voltage distribution systems up to 1 000 V AC
and 1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 11: Effectiveness of residual current monitors (RCM) type A and type B in
TT, TN and IT systems
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IEC 61557-11
Edition 2.0 2020-06
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Electrical safety in low voltage distribution systems up to 1 000 V AC
and 1 500 V DC – Equipment for testing, measuring or monitoring of protective
measures –
Part 11: Effectiveness of residual current monitors (RCM) type A and type B in
TT, TN and IT systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-8578-7
– 2 – IEC 61557-11:2020 RLV © IEC 2020
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 8
4.1 General . 8
4.2 Functions . 8
4.2.1 Operating test . 8
4.2.2 Non-operating test . 10
4.2.3 Test of actuating time . 10
4.3 Prevention of danger by fault voltages exceeding 50 V a.c. or 120 V d.c. in
the monitored system during measurement Fault voltages exceeding U . 11
L
4.4 Prevention of danger caused by overvoltages when the system is connected
Overvoltage . 11
Electromagnetic compatibility (EMC) .
5 Marking and operating instructions . 11
5.1 Markings . 11
5.2 Operating instructions . 12
5.2.1 General . 12
5.2.2 Information . 12
5.2.3 Warnings . 12
6 Tests . 12
6.1 General . 12
6.2 Operating uncertainty . 13
6.3 Test of protection against high fault voltages . 14
6.4 Test of overvoltage . 14
Annex A (informative) Differences between RCMs and RCDs .
Annex B (informative) Safety aspects, test methods and applications .
Bibliography . 23
Figure 1 – Maximum steepness of stepwise rising smooth direct test current (I ) .
T
Figure 2 – Maximum increase of linearly increasing smooth direct test current (I ) .
T
Figure 1 – Maximum step size of increasing smooth direct test current (I ) . 9
T
Figure 2 – Maximum gradient of linearly increasing smooth direct test current (I ) . 9
T
Figure 3 – Example for linearly increasing smooth direct test current (I ): I = 30 mA . 10
T ∆n
Figure A.1 – Typical installation with a combination of RCDs and RCMs .
Table 1 – Calculation of operating uncertainty . 14
Table A.1 – Normative reference and definition of function of RCM and RCD .
Table A.2 – Requirements for testing RCMs according to product standard
IEC 62020:1998 .
Table A.3 – Main technical differences between RCMs and RCDs .
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION
SYSTEMS UP TO 1 000 V AC AND 1 500 V DC –
EQUIPMENT FOR TESTING, MEASURING OR
MONITORING OF PROTECTIVE MEASURES –
Part 11: Effectiveness of residual current
monitors (RCM) type A and type B in TT, TN and IT systems
FOREWORD
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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rights. IEC shall not be held responsible for identifying any or all such patent rights.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change has
been made. Additions are in green text, deletions are in strikethrough red text.
– 4 – IEC 61557-11:2020 RLV © IEC 2020
International Standard IEC 61557-11 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This second edition cancels and replaces the first edition published in 2009. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) document title modified to include all types of RCM;
b) terms aligned with IEC 60050;
c) addition of requirements for testing new types of RCM;
d) moving of requirements for RCM Type B from former Annex A to main body text;
e) alignment of the structure with that of the whole IEC 61557 series.
The text of this International Standard is based on the following documents:
FDIS Report on voting
85/720/FDIS 85/722/RVD
Full information on the voting for the approval of this International Standard can be found in the
report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This International Standard is to be used in conjunction with IEC 61557-1:2019.
A list of all parts in the IEC 61557 series, published under the general title Electrical safety in
low voltage distribution systems up to 1 000 V AC and 1 500 V DC – Equipment for testing,
measuring or monitoring of protective measures, can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.
ELECTRICAL SAFETY IN LOW VOLTAGE DISTRIBUTION
SYSTEMS UP TO 1 000 V AC AND 1 500 V DC –
EQUIPMENT FOR TESTING, MEASURING OR
MONITORING OF PROTECTIVE MEASURES –
Part 11: Effectiveness of residual current
monitors (RCM) type A and type B in TT, TN and IT systems
1 Scope
This part of IEC 61557 specifies the requirements for test equipment applied to the testing of
the effectiven
...