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 1: General requirements

This part of IEC 61557 specifies the general requirements for measuring and monitoring equipment for testing the electrical safety in low voltage distribution systems with nominal voltages up to 1 000 V a.c. and 1 500 V d.c. When measuring equipment or measuring installations involve measurement tasks of various measuring equipment covered by this series of standards, then the part of this series of standards relevant to each of the measurement tasks is applicable.

Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V - Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen -- Teil 1: Allgemeine Anforderungen

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1 500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de protection -- Partie 1: Exigences générales

La présente partie de la CEI 61557 établit les exigences générales applicables aux dispositifs de mesure et de surveillance destinés au contrôle de la sécurité électrique dans des installations à basse tension de 1 000 V c.a. et 1 500 V c.c. Lorsque des appareils ou des dispositifs de mesure réalisent des mesures pour lesquelles différents appareils de cette série de normes sont prévus, la partie appropriée de cette série de normes est applicable au type de mesure correspondant. Cette deuxième édition annule et remplace la première édition publiée en 1997. Elle constitue une révision technique. Les principales modifications apportées par cette nouvelle édition sont les suivantes: a) Révision des définitions; b) Ajout des grandeurs d'influence E9 et E10; c) Paragraphe relatif à la compatibilité électromagnétique complété; d) Prise en compte des dispositifs de surveillance de performance dans l'introduction; e) Introduction d'exigences nouvelles pour les instructions de fonctionnement.

Električna varnost v nizkonapetostnih razdelilnih sistemih izmenične napetosti do 1 kV in enosmerne napetosti do 1,5 kV - Oprema za preskušanje, merjenje ali nadzorovanje zaščitnih ukrepov - 1. del: Splošne zahteve (IEC 61557-1:2007)

Ta del IEC 61557 poudarja osnovne zahteve za merjenje in nadzorovanje opreme za preskušanje električne varnosti v nizkonapetostnih razdelilnih sistemih z nazivno napetostjo do 1000 V izmenične in 1500 V enosmerne napetosti. Ko merimo opremo ali inštalacije, so merilne naloge različnih merilnih oprem pokrite s to družino standardov in tako je del te družine standardov relevanten in primeren za vsako merilno nalogo.

General Information

Status
Published
Publication Date
15-Aug-2007
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
13-Jul-2007
Due Date
17-Sep-2007
Completion Date
16-Aug-2007

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SLOVENSKI STANDARD
SIST EN 61557-1:2007
01-september-2007
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SIST EN 61557-1:2000

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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 1: General

requirements
Elektrische Sicherheit in Niederspannungsnetzen bis AC 1 000 V und DC 1 500 V -
Geräte zum Prüfen, Messen oder Überwachen von Schutzmaßnahmen -- Teil 1:
Allgemeine Anforderungen

Sécurité électrique dans les réseaux de distribution basse tension de 1 000 V c.a. et 1

500 V c.c. - Dispositifs de contrôle, de mesure ou de surveillance de mesures de
protection -- Partie 1: Exigences générales
Ta slovenski standard je istoveten z: EN 61557-1:2007
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
29.080.01 (OHNWULþQDL]RODFLMDQD Electrical insulation in
VSORãQR general
29.240.01 2PUHåMD]DSUHQRVLQ Power transmission and
GLVWULEXFLMRHOHNWULþQHHQHUJLMH distribution networks in
QDVSORãQR general
SIST EN 61557-1:2007 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD
EN 61557-1
NORME EUROPÉENNE
March 2007
EUROPÄISCHE NORM
ICS 17.220.20; 29.080.01; 29.240.01 Supersedes EN 61557-1:1997
English version
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 1: General requirements
(IEC 61557-1:2007)
Sécurité électrique dans les réseaux Elektrische Sicherheit
de distribution basse tension in Niederspannungsnetzen
de 1 000 V c.a. et 1 500 V c.c. - bis AC 1 000 V und DC 1 500 V -
Dispositifs de contrôle, de mesure Geräte zum Prüfen,
ou de surveillance de mesures Messen oder Überwachen
de protection - von Schutzmaßnahmen -
Partie 1: Exigences générales Teil 1: Allgemeine Anforderungen
(CEI 61557-1:2007) (IEC 61557-1:2007)

This European Standard was approved by CENELEC on 2007-03-01. CENELEC members are bound to comply

with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard

the status of a national standard without any alteration.

Up-to-date lists and bibliographical references concerning such national standards may be obtained on

application to the Central Secretariat or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CENELEC member into its own language and notified

to the Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 61557-1:2007 E
---------------------- Page: 2 ----------------------
EN 61557-1:2007 - 2 -
Foreword

The text of document 85/290/FDIS, future edition 2 of IEC 61557-1, prepared by IEC TC 85, Measuring

equipment for electrical and electromagnetic quantities, was submitted to the IEC-CENELEC parallel vote

and was approved by CENELEC as EN 61557-1 on 2007-03-01.
This European Standard supersedes EN 61557-1:1997.
The following changes were made with respect to EN 61557-1:1997:
– revision of the definitions;
– addition of influence quantities E and E ;
9 10
– the subclause on Electromagnetic compatibility was complemented;
– inclusion of performance monitoring devices in the introduction;
– addition of new requirements for operating instructions.

This Part 1 specifies the general requirements. Parts 2 to 8 of EN 61557, which are to be used in

conjunction with this Part 1, comprise specific specifications for individual measuring equipment.

The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2010-03-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 61557-1:2007 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 60359 NOTE Harmonized as EN 60359:2002 (not modified).
IEC 60364-6 NOTE Harmonized as HD 60364-6:2007 (modified).
IEC 61326-1 NOTE Harmonized as EN 61326-1:2006 (not modified).
__________
---------------------- Page: 3 ----------------------
- 3 - EN 61557-1:2007
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60038 (mod) 1983 IEC standard voltages HD 472 S1 1989
- - + corr. February 2002
- - A1 1995
A1 1994
A2 1997
IEC 60364-6 (mod) 2006 Low voltage electrical installations - HD 60364-6 2007
Part 6: Verification
2) 3)
IEC 60664-1 - Insulation coordination for equipment within EN 60664-1 2003
low-voltage systems -
Part 1: Principles, requirements and tests
IEC 60529 1989 Degrees of protection provided by enclosures EN 60529 1991
(IP Code) + corr. May 1993
A1 1999 A1 2000
IEC 61010-1 2001 Safety requirements for electrical equipment EN 61010-1 2001
for measurement, control, and laboratory + corr. June 2002
use -
Part 1: General requirements
IEC 61010-2-030 200X Safety requirements for electrical equipment - -
for measurement, control and laboratory use -
Part 2-030: Particular requirements for testing
and measuring circuits
IEC 61326-2-2 2005 Electrical equipment for measurement, EN 61326-2-2 2006
control and laboratory use - EMC
requirements -
Part 2-2: Particular requirements - Test
configurations, operational conditions and
performance criteria for portable test,
measuring and monitoring equipment used in
low-voltage distribution systems

The title of HD 472 S1 is: Nominal voltages for low voltage public electricity supply systems.

Undated reference.
Valid edition at date of issue.
To be published.
---------------------- Page: 4 ----------------------
EN 61557-1:2007 - 4 -
Publication Year Title EN/HD Year
IEC 61326-2-4 2006 Electrical equipment for measurement, EN 61326-2-4 2006
control and laboratory use - EMC
requirements -
Part 2-4: Particular requirements - Test
configurations, operational conditions and
performance criteria for insulation monitoring
devices according to IEC 61557-8 and for
equipment for insulation fault location
according to IEC 61557-9
2) 3)
IEC 61557-2 - Electrical safety in low voltage distribution EN 61557-2 2007
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
2) 3)
IEC 61557-3 - Electrical safety in low voltage distribution EN 61557-3 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 3: Loop impedance
2) 3)
IEC 61557-4 - Electrical safety in low voltage distribution EN 61557-4 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 4: Resistance of earth connection and
equipotential bonding
2) 3)
IEC 61557-5 - Electrical safety in low voltage distribution EN 61557-5 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 5: Resistance to earth
4) 5)
IEC 61557-6 - Electrical safety in low voltage distribution EN 61557-6 200X
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
2) 3)
IEC 61557-7 - Electrical safety in low voltage distribution EN 61557-7 2007
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 7: Phase sequence
2) 5)
IEC 61557-8 - Electrical safety in low voltage distribution EN 61557-8 200X
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 8: Insulation monitoring devices for IT
systems
To be ratified.
---------------------- Page: 5 ----------------------
- 5 - EN 61557-1:2007
Publication Year Title EN/HD Year
2) 3)
IEC 61557-9 - Electrical safety in low voltage distribution EN 61557-9 1999
systems up to 1 kV a.c. and 1,5 kV d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 9: Equipment for insulation fault location
in IT systems
2) 3)
IEC 61557-10 - Electrical safety in low voltage distribution EN 61557-10 2001
systems up to 1 000 V a.c. and 1 500 V d.c. -
Equipment for testing, measuring or
monitoring of protective measures -
Part 10: Combined measuring equipment for
testing, measuring or monitoring of protective
measures
---------------------- Page: 6 ----------------------
NORME CEI
INTERNATIONALE
IEC
61557-1
INTERNATIONAL
Deuxième édition
STANDARD
Second edition
2007-01
Sécurité électrique dans les réseaux
de distribution basse tension de 1 000 V c.a.
et 1 500 V c.c. –
Dispositifs de contrôle, de mesure ou de
surveillance de mesures de protection –
Partie 1: Exigences générales
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 1: General requirements
© IEC 2007 Droits de reproduction réservés ⎯ Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any

utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including

électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from

microfilms, sans l'accord écrit de l'éditeur. the publisher.

International Electrotechnical Commission, 3, rue de Varembé, PO Box 131, CH-1211 Geneva 20, Switzerland

Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

CODE PRIX
PRICE CODE
Commission Electrotechnique Internationale
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 7 ----------------------
61557-1 © IEC:2007 – 3 –
CONTENTS

FOREWORD...........................................................................................................................5

INTRODUCTION.....................................................................................................................9

1 Scope.............................................................................................................................11

2 Normative references......................................................................................................11

3 Terms and definitions .....................................................................................................13

4 Requirements .................................................................................................................21

4.1 Operating uncertainty (B), percentage operating uncertainty (B [%]) .......................23

4.2 Rated operating conditions ....................................................................................25

4.3 Battery check facility..............................................................................................25

4.4 Terminals ..............................................................................................................25

4.5 Class of protection.................................................................................................25

4.6 Class of pollution ...................................................................................................25

4.7 Overvoltage category.............................................................................................25

4.8 Measuring category ...............................................................................................25

4.9 Electromagnetic compatibility.................................................................................27

4.10 Vibration test .........................................................................................................27

5 Marking and operating instructions..................................................................................27

5.1 Marking .................................................................................................................27

5.2 Operating instructions............................................................................................29

6 Tests ..............................................................................................................................29

6.1 Influence of position...............................................................................................29

6.2 Influence of temperature........................................................................................29

6.3 Influence of the supply voltage...............................................................................31

6.4 Battery check facility..............................................................................................31

6.5 Protection class .....................................................................................................31

6.6 Terminals ..............................................................................................................31

6.7 Mechanical requirements .......................................................................................31

6.8 Marking and operating instructions.........................................................................31

Bibliography ..........................................................................................................................33

---------------------- Page: 8 ----------------------
61557-1 © IEC:2007 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
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 1: General requirements
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 61557-1 has been prepared by IEC technical committee 85:

Measuring equipment for electrical and electromagnetic quantities.

This second edition replaces and cancels the first edition published in 1997. It constitutes a

technical revision.
The following changes were made with respect to the previous edition:
a) revision of the definitions
b) addition of influence quantities E and E
9 10
c) the subclause on Electromagnetic compatibility was complemented
d) inclusion of performance monitoring devices in the introduction
e) addition of new requirements for operating instructions
---------------------- Page: 9 ----------------------
61557-1 © IEC:2007 – 7 –
The text of this standard is based on the following documents:
FDIS Report on voting
85/290/FDIS 85/300/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts of the IEC 61557 series, published under the general title Electrical safety in

low voltage distribution systems up to 1000 V a.c. and 1500 V d.c. – Equipment for testing,

measuring or monitoring of protective measures, can be found on the IEC website.

This Part 1 specifies the general requirements. Parts 2 to 8 of IEC 61557, which are to be used

in conjunction with this Part 1, comprise specific specifications for individual measuring

equipment.

The committee has decided that the contents of this publication will remain unchanged until the

maintenance result date indicated on the IEC web site under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 10 ----------------------
61557-1 © IEC:2007 – 9 –
INTRODUCTION

IEC 60364-6:2006, stipulates standardized conditions for the initial test of power installations in

TN, TT or IT (IEC 60364) systems, for continuous monitoring and for testing these installations

after modifications. In addition to general references for the execution of the tests,

IEC 60364-6 contains requirements which have to be verified by measurement. Only in a few

instances, for example when measuring the insulation resistance, the standard contains details

of the characteristics of the measuring device to be used. Circuits which are given as examples

in IEC 60364-6, and referred to within the text, are generally not suitable for practical use.

The tests are carried out in installations where hazardous voltages can occur and where

careless use or a defect in the equipment can easily cause an accident. Therefore, the

technician has to rely on measuring devices which ensure, apart from simplification of the

measurements, safe test methods.

The application of the general safety regulations for electrical and electronic measuring devices

(IEC 61010-1) for testing the protective measures is not sufficient in itself. The execution of

measurements in the installation can cause hazards not only to the technician, but, depending

on the measuring method, also to third persons.

Likewise, reliable and comparable results of measurement with measuring devices from

different manufacturers are an important precondition in order to obtain an objective judgement

about the installation, for example when the installation is handed over for periodic tests, for

continuous insulation monitoring or in the case of performance warranty.

This series of standards has been established with the aim of stipulating common principles for

measuring and monitoring equipment for testing electrical safety and measuring performances in

systems with nominal voltages up to 1 000 V a.c. and 1 500 V d.c. which correspond to the

above-mentioned characteristics.

For this reason, the following common specifications have been stipulated in Part 1 and other

individual parts of the series of standards:
– protection against extraneous voltages;
– protection class II (except insulation monitoring devices);

– specifications and safety precautions against hazardous touch voltages at the measuring

device;

– specifications for the judgement of connection configurations with respect to wiring errors

in the tested equipment;
– special mechanical requirements;
– measuring methods;
– measured quantity;
– specification of the maximum operating uncertainty;

– specifications for testing the influencing quantity and the calculation of the operational

uncertainty;

– uncertainties of the measuring device at the thresholds specified in the respective

standards;

– specification of the nature of type and routine tests and the required conditions for testing.

---------------------- Page: 11 ----------------------
61557-1 © IEC:2007 – 11 –
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 1: General requirements
1 Scope

This part of IEC 61557 specifies the general requirements for measuring and monitoring

equipment for testing the electrical safety in low voltage distribution systems with nominal

voltages up to 1 000 V a.c. and 1 500 V d.c.

When measuring equipment or measuring installations involve measurement tasks of various

measuring equipment covered by this series of standards, then the part of this series of

standards relevant to each of the measurement tasks is applicable.

NOTE The term "measuring equipment" will hereafter be used to designate "testing, measuring and monitoring

equipment".
2 Normative references

The following referenced documents are indispensable for the application 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 60038:1983 , IEC standard voltages
Amendment 1: 1994
Amendment 2: 1997
IEC 60364-6:2006, Electrical installations of buildings – Part 6: Verification

IEC 60664-1, Insulation coordination for equipment within low-voltage systems - Part 1:

Principles, requirements and tests
IEC 60529: 2001, Degrees of protection provided by enclosures (IP code)

IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control and

laboratory use – Part 1: General requirements

IEC 61010-2-030, Safety requirements for electrical equipment for measurement, control, and

laboratory use – Part 2-030: Special requirements for testing and measuring circuits

IEC 61326-2-2:2005, Electrical equipment for measurement, control and laboratory use – EMC

requirements – Part 2-2: Particular requirements – Test configurations, operational conditions

and performance criteria for portable test, measuring and monitoring equipment used in low-

voltage distribution systems
––––––––

There exists a consolidated edition (6.2), which includes IEC 60038:1983 and its Amendments 1 (1994) and 2

(1997).
To be published.
---------------------- Page: 12 ----------------------
61557-1 © IEC:2007 – 13 –

IEC 61326-2-4:2006, Electrical equipment for measurement, control and laboratory use, - EMC

requirements - Part 2: Particular requirements – Test configurations, operational conditions and

performance criteria for insulation monitoring devices according to IEC 61557-8 and for

equipment for insulation fault location according to IEC 61557-9

IEC 61557-2, Electrical safety in low voltage distribution systems up to 1000 V a.c.

and 1500 V d.c. – Equipment for testing, measuring or monitoring of protective measures –

Part 2: Insulation resistance

IEC 61557-3, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 3: Loop

impedance

IEC 61557-4, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 4:

Resistance of earth connection and equipotential bonding

IEC 61557-5, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 5:

Resistance to earth

IEC 61557-6, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 6: Residual

current devices (RCD) in TT and TN systems

IEC 61557-7, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 7: Phase

sequence

IEC 61557-8, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 8: Insulation

monitoring devices for IT systems

IEC 61557-9, Electrical safety in low voltage distribution systems up to 1000 V a.c. and 1500 V

d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 9:

Equipment for insulation fault location in IT systems

IEC 61557-10, Electrical safety in low voltage distribution systems up to 1000 V a.c. and

1500 V d.c. – Equipment for testing, measuring or monitoring of protective measures – Part 10:

Combined measuring equipment for testing, measuring or monitoring of protective measures

3 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1
nominal voltage of the distribution system (U )

voltage by which a distribution system or equipment is designated and to which certain

operating characteristics are referred
[IEC 60038, Clause 1, modified]
---------------------- Page: 13 ----------------------
61557-1 © IEC:2007 – 15 –
3.2
operating voltage in a system

the value of the voltage under normal conditions, at a given instant and a given point of the

system
[IEV 601-01-22, modified]
3.3
voltage against earth

a) in distribution systems with an earthed neutral point, the voltage between a phase conductor

and the earthed neutral point;

b) in all other distribution systems, the voltage present between the remaining phase

conductors and earth when one of the ph
...

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