IEC 61557-6:2019

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

IEC 61557-6:2019 is available as IEC 61557-6:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61557-6:2019 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. IEC 61557-6:2019 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.

Sécurité électrique dans les réseaux de distribution basse tension au plus égale à 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection - Partie 6: Efficacité des dispositifs à courant résiduel (DDR) dans les réseaux TT, TN et IT

IEC 61557-6:2019 est disponible sous forme de IEC 61557-6:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61557-6:2019 spécifie les exigences applicables aux appareils de mesure destinés à soumettre à essai l'efficacité des mesures de protection des dispositifs à courant différentiel résiduel (DDR) installés dans les réseaux TT, TN et IT. La présente norme n'a pas pour objet de vérifier la conformité des DDR aux normes de produits associées. L'IEC 61557-6:2019 annule et remplace la deuxième édition parue en 2007. Cette édition constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'exigences pour les essais d'un nouveau type de DDR;
b) ajout des exigences pour les DDR de type B (ancienne Annexe B);
c) ajout de l'Annexe B relative aux temps de déclenchement recommandés;
d) alignement de la structure sur l'ensemble de la série IEC 61557.

General Information

• Status: Published
• Publication Date: 25-Jul-2019
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.080.01 - Electrical insulation in general
• ICS: 29.240.01 - Power transmission and distribution networks in general
• Technical Committee: TC 85 - Measuring equipment for electrical and electromagnetic quantities
• Drafting Committee: WG 8 - TC 85/WG 8
• Current Stage: PPUB - Publication issued
• Start Date: 09-Aug-2019
• Completion Date: 26-Jul-2019

Standards Content (Sample)

IEC 61557-6
®

Edition 3.0 2019-07
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 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems

Sécurité électrique dans les réseaux de distribution basse tension au plus
égale à 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou
de surveillance de mesures de protection –
Partie 6: Efficacité des dispositifs à courant différentiel résiduel (DDR)
dans les réseaux TT, TN et IT

IEC 61557-6:2019-07(en-fr)

---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2019 IEC, Geneva, Switzerland

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.


Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé [e-mail]
CH-1211 Geneva 20 www.iec.ch
Switzerland

About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform Electropedia - www.electropedia.org
The advanced search enables to find IEC publications by a The world's leading online dictionary on electrotechnology,
variety of criteria (reference number, text, technical containing more than 22 000 terminological entries in English
committee,…). It also gives information on projects, replaced and French, with equivalent terms in 16 additional languages.
and withdrawn publications. Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Glossary - std.iec.ch/glossary
details all new publications released. Available online and 67 000 electrotechnical terminology entries in English and
once a month by email. French extracted from the Terms and Definitions clause of
IEC publications issued since 2002. Some entries have been
IEC Customer Service Centre - webstore.iec.ch/csc collected from earlier publications of IEC TC 37, 77, 86 and
If you wish to give us your feedback on this publication or CISPR.

need further assistance, please contact the Customer Service

Centre: [e-mail].


A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Electropedia - www.electropedia.org
webstore.iec.ch/advsearchform Le premier dictionnaire d'électrotechnologie en ligne au
La recherche avancée permet de trouver des publications IEC monde, avec plus de 22 000 articles terminologiques en
en utilisant différents critères (numéro de référence, texte, anglais et en français, ainsi que les termes équivalents dans
comité d’études,…). Elle donne aussi des informations sur les 16 langues additionnelles. Egalement appelé Vocabulaire
projets et les publications remplacées ou retirées. Electrotechnique International (IEV) en ligne.

IEC Just Published - webstore.iec.ch/justpublished Glossaire IEC - std.iec.ch/glossary
Restez informé sur les nouvelles publications IEC. Just 67 000 entrées terminologiques électrotechniques, en anglais
Published détaille les nouvelles publications parues. et en français, extraites des articles Termes et Définitions des
Disponible en ligne et une fois par mois par email. publications IEC parues depuis 2002. Plus certaines entrées
antérieures extraites des publications des CE 37, 77, 86 et
Service Clients - webstore.iec.ch/csc CISPR de l'IEC.

Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
[e-mail].

---------------------- Page: 2 ----------------------
IEC 61557-6

®


Edition 3.0 2019-07




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 6: Effectiveness of residual current devices (RCD) in TT, TN and IT systems



Sécurité électrique dans les réseaux de distribution basse tension au plus


égale à 1 000 V c.a. et 1 500 V c.c. – Dispositifs de contrôle, de mesure ou

de surveillance de mesures de protection –

Partie 6: Efficacité des dispositifs à courant différentiel résiduel (DDR)

dans les réseaux TT, TN et IT









INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-7160-5




Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale

---------------------- Page: 3 ----------------------
– 2 – IEC 61557-6:2019 © IEC 2019
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Requirements . 6
4.1 General . 6
4.2 Functions . 7
4.2.1 Measurement of trip current . 7
4.2.2 Non-tripping functions . 7
4.2.3 Fault voltage indication . 8
4.2.4 Measurement of trip time . 8
4.3 Measurement with indicators . 8
4.4 Test with rated residual operating current . 9
4.5 Fault voltages exceeding U . 9
L
4.6 Overvoltage . 9
5 Marking and operating instructions . 9
5.1 Marking . 9
5.2 Explicit indication of the waveform of the testing current . 9
5.3 Operating instructions . 10
6 Tests . 10
6.1 General . 10
6.2 Operating uncertainty . 11
6.3 Fault voltage . 12
6.4 Testing the connection to voltages higher than nominal voltage . 12
6.5 Overvoltage . 12
Annex A (informative) Applicable tripping tests (time and current) for different types
of RCDs . 13
Bibliography . 14

Table 1 – Calculation of operating uncertainty . 11
Table A.1 – Tripping tests for different types of RCD . 13

---------------------- Page: 4 ----------------------
IEC 61557-6:2019 © IEC 2019 – 3 –
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
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 itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
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 61557-6 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;

---------------------- Page: 5 ----------------------
– 4 – IEC 61557-6:2019 © IEC 2019
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.

---------------------- Page: 6 ----------------------
IEC 61557-6:2019 © IEC 2019 – 5 –
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 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 of their
content constitutes requirements 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.
IEC 61010-1:2010, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 1: General requirements
1
IEC 61010-1:2010/AMD1:2016
IEC 61010-2-030:2017, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 2-030: Particular requirements for equipment having testing or
measuring circuits
IEC 61010-031, Safety requirements for electrical equipment for measurement, control and
laboratory use – Part 031: Safety requirements for hand-held and hand-manipulated probe
assemblies for electrical test and measurement
IEC 61557-1:2019, 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 1:
General requirements
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 61557-1 and the
following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
__________
1
 A consolidated version of this publication exists, comprising IEC 61010-1:2010 and
IEC 61010-1:2010/AMD1:2016.

---------------------- Page: 7 ----------------------
– 6 – IEC 61557-6:2019 © IEC 2019
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
earth fault current
current flowing to earth due to an insulation fault
[SOURCE: IEC 60050-442:1998, 442-01-23]
3.2
residual current
I
∆
RMS value of the vector sum of the currents flowing through the main circuit of the residual
current device
[SOURCE: IEC 60050-442:1998, 442-05-19, modified – in alignment with the use in this
document. The symbol has been modified.]
3.3
rated residual operating current
I
∆n
fault current for which the residual current is designed
3.4
residual operating current
I
a
value of residual current which causes the residual current device to operate under specified
conditions
[SOURCE: IEC 60050-442:1998, 442-05-20, modified – The symbol has been added.]
3.5
leakage current
electric current in an unwanted conductive path to earth under normal operating conditions
[SOURCE: IEC 60050-195:1998, 195-05-15, modified – "to earth" has been added and the
deprecated term "earth current" omitted.]
3.6
test resistance
R
p
resistance by means of which a fault current for test purposes is produced
3.7
resistance to earth
resistance to ground, US
real part of the impedance to earth
[SOURCE: IEC 60050-195:1998, 195-01-18]
4 Requirements
4.1 General
In addition to the requirements of IEC 61557-1:2019, Clause 4, the requirements of Clause 4
of this document shall apply.

---------------------- Page: 8 ----------------------
IEC 61557-6:2019 © IEC 2019 – 7 –
Test leads and test probes used with this measuring equipment shall fulfil the requirements
of IEC 61010-031.
Equipment intended for making measurements on distribution systems shall, at the minimum,
be rated for measurement category III in accordance with IEC 61010-2-030.
Equipment intended for making measurements on electrical equipment shall, at the minimum,
be rated for measurement category II in accordance with IEC 61010-2-030.
4.2 Functions
4.2.1 Measurement of trip current
The measuring equipment shall be capable of indicating if and when the residual operating
current of the protective device is less than or equal to the rated residual operating current.
The tests shall be carried out with a sinusoidal, or mains-derived quasi sinusoidal test current.
The operating uncertainty of the test currents, determined in accordance with Table 1, shall
not exceed (the rated residual operating current) +10 %.
The operating uncertainty of measurement of the residual operating current, determined in
accordance with Table 1, shall not exceed ±10 % of the rated residual operating current.
If the measuring equipment is provided for the purpose of testing residual current devices
(RCD) of 30 mA or below, installed for supplementary protection, the measuring equipment
shall be capable of providing a test of 5 times the rated residual operating current. The test
period shall be limited to 40 ms. When measuring the trip time, this limit of test period need
not be applied so long as the fault voltage remains below the touch voltage limit.
If the measuring equipment is capable of producing half-wave test currents, testing of pulse
current sensitive RCDs may alternatively be carried out using half-wave test currents. In this
case, test equipment shall be able to test in both polarities.
If the measuring equipment includes a test intended to be applied to residual current devices
(RCD) type B, the test current shall be an increasing smooth direct residual current.
NOTE A smooth direct current is a current with less than 10 % AC ripple (peak to peak).
If the test current increases linearly, the rate of increase shall not be greater than 2 times I
Δn
in 5 s. If the test current increases in steps, the increase per step shall not be more than
2 times I /30 and the rate of increase shall not be greater than 2 times I in 5 s.
Δn Δn
It shall be possible to test with both polarities of the test current. The operating uncertainty of
the measurement of the residual current shall not exceed ±10 % of the rated residual
operating current and the operating uncertainty of the maximum value of the increasing test
current shall not exceed (2 times the rated residual operating current) +10 %.
4.2.2 Non-tripping functions
When a test at 50 % or less of the rated residual operating current is included to test the
immunity of the RCD to nuisance tripping, the minimum test period for general type RCDs
shall be 0,3 s and for type S RCDs, it shall be 0,5 s. The protective device shall not operate.
When a non-trip test at 50 % or less of the rated residual operating current is included, the
operating uncertainty of the calibrated test current shall be in the range between
0 % and −10 % of the specified non-tripping test current in accordance with Table 1.

---------------------- Page: 9 ----------------------
– 8 – IEC 61557-6:2019 © IEC 2019
If the purpose of the test is to evaluate other parameters (e.g. fault voltage) the minimum test
period may be shorter but not less than one cycle of the rated frequency.
4.2.3 Fault voltage indication
The measuring equipment shall be capable of indicating whether the fault voltage at the rated
residual operating current of the protective device is less than or equal to the conventional
touch voltage limit. The test may be carried out with or without a probe.
Indication may be provided by displaying the value of the fault voltage or by the use of other
clear indicators.
If the value of the fault voltage or the indication for the fault current (shown on a display or
otherwise indicated) show the value for the residual current and not for the rated residual
operating current, this shall be indicated on the display or on the measuring equipment.
Otherwise the fault voltage shall be calculated according to Equation 1:
I
a
UU≤×
  (1)
F
L I
Δn
where
U  is the fault voltage;
F
U  is the conventional touch voltage limit;
L
I is the rated residual operating current;
∆n
I  is the residual operating current.
a
The operating uncertainty of the fault voltage measurement, determined in accordance with
Table 1, shall be in the range of 0 % and +20 % with the conventional touch voltage limit as
fiducial value.
The internal resistance of the voltage measuring equipment should be at least 0,7 kΩ/V of the
full-scale value of the measurement range. The influence of the voltage measurement on the
measurement of the fault current should be taken into consideration.
4.2.4 Measurement of trip time
The measuring equipment shall be capable of measuring the trip time of residual current
devices (RCD) at the rated residual operating current or shall be capable of indicating the
compliance with the maximum permissible trip time. As a minimum, the test equipment shall
include a test with a sinusoidal test current.
When measuring the trip time, the operating uncertainty shall not exceed ±10 % with the
maximum permissible trip time as fiducial value and the influence quantities according
to Table 1.
If trip times are measured with different waveforms, the manufacturer should provide guidance
on the interpretation of the results in the operating instructions.
4.3 Measurement with indicators
On measuring equipment with indicators, the threshold value of the indicators shall be the
value for the calculation of uncertainties.

---------------------- Page: 10 ----------------------
IEC 61557-6:2019 © IEC 2019 – 9 –
4.4 Test with rated residual operating current
When testing with the rated residual operating current, the following conditions shall be met:
– the test current shall be switched on during a zero crossing;
– the starting phase of the test current shall be indicated to the user;
– the test period shall be limited to the maximum allowed trip time of the residual current
device (RCD) under test. When measuring the trip time, these limits of the test periods
need not be applied.

4.5 Fault voltages exceeding U
L
Prevention of danger due to fault voltages exceeding U within the system under test shall be
L
ensured during measurements. This can be achieved as follows:
– automatic disconnection in accordance with IEC 61010-1:2010/AMD1:2016, Figure 2,
when fault voltages > U occur;
L
– use of test resistances R adjustable in steps, or continuously, in such a manner that the
p
test is started with a resistance that permits a maximum current of 3,5 mA to flow when all
parallel-connected circuits are included. An unambiguous detection shall be ensured, for
example by means of a voltmeter, to determine whether this test resistance can be varied
without producing a hazardous fault voltage.
If the measuring equipment indicates the value of the voltage at its measuring terminals, it
shall also indicate if the system voltage exists and if the live conductor is exchanged with the
protective conductor.
4.6 Overvoltage
The user shall not be exposed to danger and the equipment shall not be damaged when the
measuring equipment is connected for at least 10 min to 120 % of the nominal voltage of the
distribution system for which the measuring equipment has been designed. Protective devices
shall not be activated.
The user shall not be exposed to danger and the measuring equipment shall not be damaged
when the measuring equipment is accidentally connected for at least 1 min with up to 173 %
of its rated voltage to earth. Protective devices may be activated.
5 Marking and operating instructions
5.1 Marking
In addition to IEC 61557-1:2019, 5.1 and 5.2, the following information shall be provided on
the measuring equipment.
The rated residual operating current or rated residual operating currents of the residual
current device (RCD) for which the measuring equipment has been designed shall be marked.
The maximum voltage to earth and the rated measuring category shall be marked.
5.2 Explicit indication of the waveform of the testing current
The measuring equipment shall contain the indication that in the case of a half wave testing
current or DC testing current, the tripping test shall be carried out in both directions (see
Annex A for tripping test for different types of RCD). Where there is insufficient space, the
warning symbol according to IEC 61010-1:2010, Table 1 symbol 14 shall be marked adjacent
to the RCD function or a warning shall be given on the display.

---------------------- Page: 11 ----------------------
– 10 – IEC 61557-6:2019 © IEC 2019
5.3 Operating instructions
In addition to IEC 61557-1:2019, 5.3, the operating instructions shall include the following
information.
– Where the measuring circuit has no probe and a voltage present between the protective
conductor and earth will influence the measurements, a warning shall be included.
– Where the measuring circuit uses the N-conductor as a probe, a warning shall be given to
test the connection between the neutral point of the distribution system and earth before
the test is started; a possible voltage between the N-conductor and the earth may
influence the measurements.
– A warning that leakage currents in the circuit following the residual current device (RCD)
may influence the measurements.
– Where the fault voltage is indicated by the test equipment, a clear statement shall be
given as to whether the voltage relates to the rated residual operating current or to the
residual operating current of the protective device. If applicable, a note to
...