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
Current Stage
PPUB - Publication issued
Completion Date
26-Jul-2019
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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
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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 ----------------------
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---------------------- 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

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

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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
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/
__________

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

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
fault current for which the residual current is designed
3.4
residual operating current

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
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

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:
UU≤×
(1)
L I
where
U is the fault voltage;
U is the conventional touch voltage limit;
I is the rated residual operating current;
I is the residual operating current.

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

Prevention of danger due to fault voltages exceeding U within the system under test shall be

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;

– use of test resistances R adjustable in steps, or continuously, in such a manner that the

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
...

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