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IEC 61557-6
Edition 3.0 2019-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems
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IEC 61557-6
Edition 3.0 2019-07
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-7236-7
– 2 – IEC 61557-6:2019 RLV © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 7
4.1 General . 7
4.2 Tests Functions . 7
4.2.1 Tripping tests Measurement of trip current . 7
4.2.2 Non-tripping tests functions . 8
4.2.3 Fault voltage indication . 8
4.2.4 Measurement of trip time . 10
4.3 Measurement with indicators . 10
4.4 Test with rated residual operating current . 10
4.5 Fault voltages exceeding U . 10
L
4.6 Overvoltage . 10
5 Marking and operating instructions . 11
5.1 Marking . 11
5.2 Explicit indication of the waveform of the testing current . 11
5.3 Operating instructions . 11
6 Tests . 12
6.1 General . 12
6.2 Operating uncertainty . 12
6.3 Fault voltage . 13
6.4 Testing the connection to voltages higher than nominal voltage . 13
6.5 Overvoltage . 14
Annex A (normative) Measuring equipment for residual current protective devices
(RCDs) of type B .
Annex A (informative) Applicable tripping tests (time and current) for different types of
RCDs . 17
Bibliography . 18
Table 1 – Calculation of operating uncertainty . 13
Table A.1 – Tripping tests for different types of RCD . 17
Table 1 – Calculation of operating uncertainty . 13
Table A.1 – Tripping tests for different types of RCD . 17
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 6: Effectiveness of residual current devices (RCD)
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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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 61557-6:2019 RLV © IEC 2019
International Standard IEC 61557-6 has been prepared by IEC technical committee 85:
Measuring equipment for electrical and electromagnetic quantities.
This third edition cancels and replaces the second edition published in 2007. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) addition of requirements for testing a new type of RCD;
b) addition of requirements for type B RCDs (former Annex B);
c) addition of new Annex B on recommended tripping times;
d) 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/ 684/FDIS 85/ 697/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 6: Effectiveness of residual current devices (RCD)
in TT, TN and IT systems
1 Scope
This part of IEC 61557 specifies the requirements for measuring equipment applied to the
testing of the effectiveness of protective measures by regular disconnections of residual
current protective devices (RCD) in TT, TN and IT systems.
This part of IEC 61557 specifies the requirements applicable to measuring equipment for
testing the effectiveness of protective measures of residual current devices (RCD) installed in
TT, TN and IT systems.
It is not the purpose of this document to verify the RCD according to their product standards.
NOTE Applicable tripping tests for time and current of RCD are listed in Annex A, Table A.1.
2 Normative references
The following documents are referred to in the text in such a way that some or all
...