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 2: Insulation resistance

IEC 61557-2:2019 is available as IEC 61557-2:2019 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.IEC 61557-2:2019 specifies the requirements applicable to equipment for measuring the insulation resistance of equipment and installations in the de-energized state IEC 61557-2:2019 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 as regards measurement category;
b) addition of new requirements for operating instructions;
c) alignment of the structure with that of the 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 2: Résistance d'isolement

IEC 61557-2:2019 est disponible sous forme de IEC 61557-2:2019 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.L'IEC 61557-2:2019 spécifie les exigences applicables aux appareils destinés à mesurer la résistance d'isolement d'appareils et d'installations hors tension. L'IEC 61557-2:2019 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 antérieure:
a) ajout d'une exigence relative à la catégorie de mesure;
b) ajout de nouvelles exigences relatives aux instructions de fonctionnement;
c) 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 61557-2
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 2: Insulation resistance
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 2: Résistance d'isolement
IEC 61557-2:2019-07(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61557-2
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 2: Insulation resistance
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 2: Résistance d'isolement
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.080.01; 29.240.01 ISBN 978-2-8322-7155-1

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 61557-2:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 3

1 Scope .............................................................................................................................. 5

2 Normative references ...................................................................................................... 5

3 Terms and definitions ...................................................................................................... 5

4 Requirements .................................................................................................................. 6

4.1 General requirements ............................................................................................. 6

4.2 Output voltage ........................................................................................................ 6

4.3 Rated current .......................................................................................................... 6

4.4 Measuring current ................................................................................................... 6

4.5 Influence of external capacitors .............................................................................. 6

4.6 Overvoltage ............................................................................................................ 6

5 Marking and operating instructions .................................................................................. 7

5.1 Marking ................................................................................................................... 7

5.2 Operating instructions ............................................................................................. 7

6 Tests ............................................................................................................................... 8

6.1 General ................................................................................................................... 8

6.2 Operating uncertainty .............................................................................................. 8

6.3 Open-circuit voltage ................................................................................................ 8

6.4 Rated current .......................................................................................................... 8

6.5 Measuring current ................................................................................................... 9

6.6 Overvoltage tests .................................................................................................... 9

6.6.1 Overvoltage tests with AC voltage ................................................................... 9

6.6.2 Overvoltage tests with DC voltage ................................................................... 9

6.7 Battery life in battery operated instruments ............................................................. 9

6.8 Stability test ............................................................................................................ 9

Figure 1 – Example of a pictogram for a 500 V AC system ...................................................... 7

Table 1 – Calculation of operating uncertainty ........................................................................ 8

---------------------- Page: 4 ----------------------
IEC 61557-2:2019 © 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 2: Insulation resistance
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 61557-2 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 as regards measurement category;
b) addition of new requirements for operating instructions;
c) alignment of the structure with that of the whole IEC 61557 series.
---------------------- Page: 5 ----------------------
– 4 – IEC 61557-2:2019 © IEC 2019
The text of this International Standard is based on the following documents:
FDIS Report on voting
85/688/FDIS 85/693/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 61557-2:2019 © 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 2: Insulation resistance
1 Scope

This part of IEC 61557 specifies the requirements applicable to equipment for measuring the

insulation resistance of equipment and installations in the de-energized state.
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 61010-031, 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 61010-2-034:2017, Safety requirements for electrical equipment for measurement, control,

and laboratory use – Part 2-034: Particular requirements for measurement equipment for

insulation resistance and test equipment for electric strength

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/
• ISO Online browsing platform: available at http://www.iso.org/obp
____________

A consolidated version of this publication exists, comprising IEC 61010-1:2010 and

IEC 61010-1:2010/AMD1:2016.
---------------------- Page: 7 ----------------------
– 6 – IEC 61557-2:2019 © IEC 2019
3.1
line-to-line voltage
DEPRECATED: phase-to-phase voltage
voltage between two line conductors at a given point of an electric circuit
[SOURCE: IEC 60050-195:1998, 195-05-01]
4 Requirements
4.1 General requirements

In addition to the requirements of IEC 61557-1:2019, Clause 4, the requirements of Clause 4

of this document shall apply.

Insulation measurement equipment shall fulfil the safety requirements of IEC 61010-2-034.

Test leads and test probes used with insulation measuring equipment shall fulfil the

requirements of IEC 61010-031.

Equipment intended for making measurements on distribution systems shall be rated at least

for measurement category III.

Equipment intended for making measurements on electrical equipment shall be rated at least

for measurement category II.
4.2 Output voltage
The output voltage shall be a DC voltage.
The open-circuit voltage shall not exceed 1,25 times the rated output voltage.
4.3 Rated current
The rated current shall be at least 1 mA.
4.4 Measuring current

The measuring current shall not exceed 15 mA peak. Any AC component present shall not

exceed 1,5 mA peak.
4.5 Influence of external capacitors

The indication of a measured resistance of 1 (± 1 %) MΩ shall not differ by more than 10 % as

a result of AC voltage components possibly present in the output voltage, when a capacitor of

2 (± 10 %) µF is connected in parallel with the measured resistance. If the manufacturer

specifies a higher capacitance for the object under test, the 2 µF capacitor shall be replaced

to adhere to the manufacturer's specified capacitance value.
4.6 Overvoltage

The user shall not be subjected to danger when extraneous DC or AC voltages up to 120 % of

the highest rated output voltage are accidentally applied for a duration of not less than 10 s to

the measurement terminals of the measuring equipment.

When the measuring equipment bears one of the following markings, the applied extraneous

AC overvoltage may be reduced to a voltage of 1,1 times the line-to-line voltage:

---------------------- Page: 8 ----------------------
IEC 61557-2:2019 © IEC 2019 – 7 –
a) DO NOT USE IN DISTRIBUTION SYSTEMS WITH VOLTAGES HIGHER THAN ... V.
The marking shall be written in the corresponding country language.

The value of the voltage shown on the marking shall be 1,1 times the maximum line-to-line

voltage.
b) Example of pictogram for a 500 V AC system
Figure 1 – Example of a pictogram for a 500 V AC system

The pictogram and outline in Figure 1 shall contrast with the background. The value of the

voltage shown on the marking shall be 1,1 times the maximum line-to-line voltage.

After applying this reduced AC overvoltage, the equipment shall meet the specifications of 4.6.

5 Marking and operating instructions
5.1 Marking
In addition to the marking in accordance with IEC 61557-1:2019, 5.1 and 5.2 and

IEC 61010-2-034:2017, Clause 5, the following information shall be provided on the

measuring equipment.
– rated output voltage,
– rated current,
– measurement range,
– rated voltage to earth and measuring category.
5.2 Operating instructions

The operating instructions shall state the following information in addition to the statements

specified in IEC 61557-1:2019, 5.3 and in IEC 61010-2-034:2017, Clause 5:

– a warning stating that measurements shall be carried out only on parts of an installation or

equipment that is de-energized;

– a statement on the correct operation when power is supplied by a hand-driven generator;

– the number of possible measurements shall be stated for measuring equipment with power

supplied by batteries/accumulators;

– a statement about the maximum capacitance value of the tested object if higher than 2 µF;

– a statement about intended applications of the equipment;
– a statement about discharge time and relevant capacity of the tested object.
---------------------- Page: 9 ----------------------
– 8 – IEC 61557-2:2019 © IEC 2019
6 Tests
6.1 General

In addition to IEC 61557-1:2019, Clause 6 and IEC 61010-2-034:2017, Clause 6, the following

tests shall be performed.
6.2 Operating uncertainty

The maximum percentage operating uncertainty within the measurement range to be marked

or stated shall not exceed ±30 % with the measured value as fiducial value, as determined in

accordance with Table 1.

The operating uncertainty shall apply under the rated operating conditions in accordance with

IEC 61557-1:
– nominal value of the supply voltage;
– nominal r/min when power is supplied by a hand-driven generator;
– reference temperature 23 °C ± 2 °C;
– reference position in accordance with the manufacturer's statement.
Table 1 – Calculation of operating uncertainty
Requirements
Intrinsic
Reference conditions or Designation or tests in accordance Type of
uncertainty or
specified operating range code with relevant parts of test
influence quantity
IEC 61557
Intrinsic uncertainty Reference conditions A IEC 61557-2:2019, 6.2 R
Position Reference position ±90° E IEC 61557-1:2019, 4.2 R
approximately
Supply voltage At the limits stated by the E IEC 61557-1:2019, 4.2, 4.3 R
manufacturer
Temperature 0 °C and 35 °C E IEC 61557-1:2019, 4.2 T
(± 2 °C)
Operating IEC 61557-2:2019, 6.2 R
uncertainty
Key
B % =±× 100 %
A = intrinsic uncertainty
E = variations
R = routine test
T = type test
F = fiducial value
6.3 Open-circuit voltage

The open-circuit voltage shall be checked with a test circuit with a loading resistance of a

minimum of U × 100 kΩ/V for compliance with the specification in 4.2 (routine test).

6.4 Rated current

The rated current shall be tested through a test resistor of a value of U × 1 000 Ω/V.

Compliance with the requirements in 4.3 shall be checked (routine test).
---------------------- Page: 10 ----------------------
IEC 61557-2:2019 © IEC 2019 – 9 –
6.5 Measuring current

The measuring current shall be tested and compliance with the requirements in 4.4 shall be

checked (routine test).

When an AC voltage is superimposed on the DC voltage, the measuring equipment for

measuring the peak value of the current shall be applied.
6.6 Overvoltage tests
6.6.1 Overvoltage tests with AC voltage

The permissible overvoltage in accordance with 4.6 shall be tested. For this purpose an AC

voltage according to 4.6 shall be applied for a duration of not less than 10 s whilst the

equipment is switched on and off (type test).

The AC test source shall have the capability to activate protective devices and to indicate

weak points of circuitry. If protective devices are activated or parts are damaged, the test

shall be repeated with a test source having a capability according to IEC 61010-1:2010, 16.2.

After the test with AC overvoltage according to 4.6, defects, if any, shall be clearly indicated;

indications and displayed values shall not lead to unsafe interpretations.

After tests with AC overvoltages according to 4.6, the equipment shall stay within the

specification.
This includes reactivation of protective devices by the user without any repair.

The replacement of fuses accessible to the user should be considered as reactivation of a

protective device.
6.6.2 Overvoltage tests with DC voltage

In addition to the overvoltage tests with AC, a DC voltage of 1,2 times the magnitude of the

highest rated output voltage stored on a capacitor of 2 µF shall be applied in both polarities

whilst the equipment is switched on and off. After this, the measuring equipment shall stay

within the specification, but without activation of the protective devices (type test).

6.7 Battery life in battery operated instruments

The number of possible measurements shall be determined until the limit of the voltage range

determined by the battery check facility is reached (type test).

In this process, the measuring equipment shall be loaded with a test resistance of

× 1 000 Ω/V for a loading period not less than 5 s, with intervals of not less than 25 s prior

to each new loading.
6.8 Stability test

Tests shall verify that the indication of measured resistance of 1 (±1 %) MΩ is stable and

does not change by more than 10 % when a capacitor of 2 (±10 %) µF (or a higher

capacitance value, if specified) is connected in parallel. Resistance and inductance of the test

capacitor shall be negligible (type test).
___________
---------------------- Page: 11 ----------------------
– 10 – IEC 61557-2:2019 © IEC 2019
SOMMAIRE

AVANT-PROPOS .................................................................................................................. 11

1 Domaine d'application ................................................................................................... 13

2 Références normatives .................................................................................................. 13

3 Termes et définitions ..................................................................................................... 13

4 Exigences ...................................................................................................................... 14

4.1 Généralités ........................................................................................................... 14

4.2 Tension de sortie .................................................................................................. 14

4.3 Courant assigné .................................................................................................... 14

4.4 Courant de mesure ............................................................................................... 14

4.5 Influence des condensateurs externes .................................................................. 14

4.6 Surtension ............................................................................................................ 14

5 Marquage et instructions de fonctionnement .................................................................. 15

5.1 Marquage ............................................................................................................. 15

5.2 Instructions de fonctionnement ............................................................................. 15

6 Essais ........................................................................................................................... 16

6.1 Généralités ........................................................................................................... 16

6.2 Incertitude de fonctionnement ............................................................................... 16

6.3 Tension en circuit ouvert ....................................................................................... 16

6.4 Courant assigné .................................................................................................... 16

6.5 Courant de mesure ............................................................................................... 17

6.6 Essais de surtension ............................................................................................. 17

6.6.1 Essais de surtension avec une tension alternative ......................................... 17

6.6.2 Essais de surtension avec une tension continue ............................................ 17

6.7 Durée de vie des batteries des instruments fonctionnant sur batterie .................... 17

6.8 Essai de stabilité ................................................................................................... 18

Figure 1 – Exemple de pictogramme pour un réseau de 500 V en courant alternatif .............. 15

Tableau 1 – Calcul de l'incertitude de fonctionnement ........................................................... 16

---------------------- Page: 12 ----------------------
IEC 61557-2:2019 © IEC 2019 – 11 –
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
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 2: Résistance d'isolement
AVANT-PROPOS

1) La Commission Electrotechnique Internationale (IEC) est une organisation mondiale de normalisation

composée de l'ensemble des comités
...

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