IEC 61009-1:2010

Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules

IEC 61009-1:2010 applies to residual current operated circuit breakers with integral overcurrent protection functionally independent of, or functionally dependent on, line voltage for household and similar uses (hereafter referred to as RCBOs), for rated voltages not exceeding 440 V a.c. with rated frequencies of 50 Hz, 60 Hz or 50/60 Hz and rated currents not exceeding 125 A and rated short circuit capacities not exceeding 25 000 A for operation at 50 Hz or 60 Hz. This third edition cancels and replaces the second edition, published in 1996, amendment 1 (2002) and amendment 2 (2006). It constitutes a technical revision. This edition includes the following significant technical changes with respect to the previous edition:
- complete revision of EMC sequences, including the new test T.2.6, already approved in IEC 61543;
- clarification of RCDs current/time characteristics reported in Tables 2 and 3;
- revision of test procedure for IΔn between 5 A and 200 A;
- tests for the use of RCBOs in IT systems;
- testing procedure regarding the 6mA d.c. current superimposed to the fault current;
- improvement highlighting RCDs with multiple sensitivity;
- some alignments with IEC 60898-1.

Interrupteurs automatiques à courant différentiel résiduel avec dispositif de protection contre les surintensités incorporé pour usages domestiques et analogues (DD) - Partie 1: Règles générales

La CEI 61009-1:2010 s'applique aux interrupteurs automatiques avec protection contre les surintensités incorporé, à courant différentiel résiduel, fonctionnellement indépendants ou fonctionnellement dépendants de la tension d'alimentation, pour installations domestiques et analogues (en abrégé "DD" dans la suite du texte), ayant une tension assignée ne dépassant pas 440 V alternatifs, avec des fréquences assignées de 50 Hz, 60 Hz ou 50/60 Hz et un courant assigné ne dépassant pas 125 A et un pouvoir de coupure ne dépassant pas 25 000 A pour fonctionnement à 50 Hz ou 60 Hz. Cette troisième édition annule et remplace la deuxième édition, publiée en 1996, ainsi que l'amendement 1 (2002) et l'amendement 2 (2006), dont elle constitue une révision technique. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- révision complète des séquences CEM, incluant le nouvel essai T.2.6, déjà approuvé dans la CEI 61543;
- clarification des caractéristiques courant/temps des DDR incluses dans les Tableaux 2 et 3;
- révision de la procédure d'essai pour IΔn entre 5 A et 200 A;
- essais pour l'emploi des DD dans les systèmes IT;
- procédure d'essai concernant le courant continu 6 mA superposé au courant de défaut;
- des améliorations mettant en relief les DDR avec sensibilité multiple;
- des alignements avec la CEI 60898-1.

General Information

• Status: Published
• Publication Date: 10-Feb-2010
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.120.50 - Fuses and other overcurrent protection devices
• Technical Committee: SC 23E - Circuit-breakers and similar equipment for household use
• Drafting Committee: WG 2 - TC 23/SC 23E/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 31-Jan-2010
• Completion Date: 11-Feb-2010

Relations

• Amended By: IEC 61009-1:2010/AMD1:2012 - Amendment 1 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Amended By: IEC 61009-1:2010/AMD2:2013 - Amendment 2 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:1996/AMD2:2006 - Amendment 2 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:1996/COR1:2003 - Corrigendum 1 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:1996 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023
• Revises: IEC 61009-1:1996/AMD1:2002 - Amendment 1 - Residual current operated circuit-breakers with integral overcurrent protection for household and similar uses (RCBOs) - Part 1: General rules
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 61009-1 CEI 61009-1
(Edition 3.1 – 2012) (Edition 3.1 – 2012)
Consolidated version Version consolidée

Residual current operated circuit-breakers with Interrupteurs automatiques à courant différentiel
integral overcurrent protection for household résiduel avec dispositif de protection contre
and similar uses (RCBOs) – les surintensités incorporé pour usages
domestiques et analogues (DD) –
Part 1: General rules
Partie 1: Règles générales
CO RRI G E NDUM 1
NOTE This corrigendum concerns only NOTE Ce corrigendum ne concerne que
the consolidated version of IEC 61009-1, la ve
...

IEC 61009-1 ®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (DD) –
Partie 1: Règles générales
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
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et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

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IEC 61009-1 ®
Edition 3.0 2010-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (DD) –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
XG
CODE PRIX
ICS 29.120.50 ISBN 978-2-88910-399-7
– 2 – 61009-1 © IEC:2010
CONTENTS
FOREWORD.9
INTRODUCTION.11
1 Scope.12
2 Normative references .13
3 Terms and definitions .14
3.1 Definitions relating to currents flowing from live parts to earth .14
3.2 Definitions relating to the energization of a residual current circuit-breaker .15
3.3 Definitions relating to the operation and functions of residual current circuit-
breakers.15
3.4 Definitions relating to values and ranges of energizing quantities .18
3.5 Definitions relating to values and ranges of influencing quantities .22
3.6 Definitions relating to terminals .23
3.7 Definitions relating to conditions of operation .24
3.8 Definitions relating to constructional elements.25
3.9 Definitions relating to tests .27
3.10 Definitions relating to insulation coordination.27
4 Classification.29
4.1 According to the method of operation .29
4.1.1 RCBO functionally independent of line voltage (see 3.3.8).29
4.1.2 RCBO functionally dependent on line voltage (see 3.3.9) .29
4.2 According to the type of installation.29
4.3 According to the number of poles and current paths .29
4.4 According to the possibility of adjusting the residual operating current .29
4.5 According to resistance to unwanted tripping due to voltage surges .30
4.6 According to behaviour in presence of d.c. components .30
4.7 According to time-delay (in presence of a residual current) .30
4.8 According to the protection against external influences .30
4.9 According to the method of mounting .30
4.10 According to the method of connection.30
4.11 According to the instantaneous tripping current (see 3.4.18) .30
4.12 According to the I²t characteristic .30
5 Characteristics of RCBOs.30
5.1 Summary of characteristics .30
5.2 Rated quantities and other characteristics .31
5.2.1 Rated voltage .31
5.2.2 Rated current (I ) .31
n
5.2.3 Rated residual operating current (I ) .32
Δn
5.2.4 Rated residual non-operating current (I ) .32
Δno
5.2.5 Rated frequency .32
5.2.6 Rated short-circuit capacity (I ) .32
cn
5.2.7 Rated residual making and breaking capacity (I ).32
Δm
5.2.8 RCBO type S.32
5.2.9 Operating characteristics in case of residual currents with d.c.
components.32
5.3 Standard and preferred values .32
5.3.1 Preferred values of rated voltage (U ) .32
n
61009-1 © IEC:2010 – 3 –
5.3.2 Preferred values of rated current (I ) .33
n
5.3.3 Standard values of rated residual operating current (I ) .33
Δn
5.3.4 Standard value of residual non-operating current (I ) .33
Δno
5.3.5 Standard values of rated frequency .33
5.3.6 Values of rated short-circuit capacity .34
5.3.7 Minimum value of the rated residual making and breaking capacity
(I ) .34
Δm
5.3.8 Limiting values of break time and non-actuating time for RCBO of
type AC and A .34
5.3.9 Standard ranges of overcurrent instantaneous tripping .35
5.3.10 Standard values of rated impulse withstand voltage (U ) .36
imp
6 Marking and other product information.36
7 Standard conditions for operation in service and for installation.38
7.1 Standard conditions.38
7.2 Conditions of installation .39
7.3 Pollution degree .39
8 Requirements for construction and operation.39
8.1 Mechanical design.39
8.1.1 General .39
8.1.2 Mechanism .40
8.1.3 Clearances and creepage distances (see also Annex B).41
8.1.4 Screws, current-carrying parts and connections.43
8.1.5 Terminals for external conductors.44
8.1.6 Non-interchangeability.46
8.2 Protection against electric shock .46
8.3 Dielectric properties and isolating capability .47
8.4 Temperature-rise.47
8.4.1 Temperature-rise limits.47
8.4.2 Ambient air temperature .48
8.5 Operating characteristics.48
8.5.1 Under residual current conditions .48
8.5.2 Under overcurrent conditions.48
8.6 Mechanical and electrical endurance.50
8.7 Performance at short-circuit currents.50
8.8 Resistance to mechanical shock and impact.50
8.9 Resistance to heat .50
8.10 Resistance to abnormal heat and to fire .
...

IEC 61009-1 ®
Edition 3.2 2013-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (DD) –
Partie 1: Règles générales
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]
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CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
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IEC 61009-1 ®
Edition 3.2 2013-09
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Residual current operated circuit-breakers with integral overcurrent protection

for household and similar uses (RCBOs) –

Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de

protection contre les surintensités incorporé pour usages domestiques et

analogues (DD) –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-1101-4

IEC 61009-1 ®
Edition 3.2 2013-09
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (DD) –
Partie 1: Règles générales
– 2 – 61009-1  IEC:2010+A1:2012
+A2:2013
CONTENTS
FOREWORD . 10
INTRODUCTION . 12

1 Scope . 13
2 Normative references . 15
3 Terms and definitions . 16
3.1 Definitions relating to currents flowing from live parts to earth . 16
3.2 Definitions relating to the energization of a residual current circuit-breaker . 16
3.3 Definitions relating to the operation and functions of residual current circuit-
breakers . 17
3.4 Definitions relating to values and ranges of energizing quantities . 20
3.5 Definitions relating to values and ranges of influencing quantities . 24
3.6 Definitions relating to terminals . 24
3.7 Definitions relating to conditions of operation . 26
3.8 Definitions relating to constructional elements . 27
3.9 Definitions relating to tests . 28
3.10 Definitions relating to insulation coordination . 28
4 Classification . 30
4.1 According to the method of operation . 30
4.1.1 RCBO functionally independent of line voltage (see 3.3.8) . 30
4.1.2 RCBO functionally dependent on line voltage (see 3.3.9) . 30
4.2 According to the type of installation . 31
4.3 According to the number of poles and current paths . 31
4.4 According to the possibility of adjusting the residual operating current . 31
4.5 According to resistance to unwanted tripping due to voltage surges . 31
4.6 According to behaviour in presence of d.c. components . 31
4.7 According to time-delay (in presence of a residual current) . 31
4.8 According to the protection against external influences . 31
4.9 According to the method of mounting . 32
4.10 According to the method of connection . 32
4.11 According to the instantaneous tripping current (see 3.4.18) . 32
4.12 According to the I²t characteristic . 32
4.13 According to the type of terminals . 32
5 Characteristics of RCBOs . 32
5.1 Summary of characteristics . 32
5.2 Rated quantities and other characteristics . 33
5.2.1 Rated voltage . 33
5.2.2 Rated current (I ) . 33
n
5.2.3 Rated residual operating current (I ) . 34
∆n
5.2.4 Rated residual non-operating current (I ) . 34
∆no
5.2.5 Rated frequency . 34
5.2.6 Rated short-circuit capacity (I ) . 34
cn
5.2.7 Rated residual making and breaking capacity (I ) . 34
∆m
5.2.8 RCBO type S . 34
5.2.9 Operating characteristics in case of residual currents with d.c.
components . 34
5.3 Standard and preferred values . 34

61009-1  IEC:2010+A1:2012 – 3 –
+A2:2013
5.3.1 Preferred values of rated voltage (U ) . 34
n
5.3.2 Preferred values of rated current (I ) . 35
n
5.3.3 Standard values of rated residual operating current (I ) . 35
∆n
5.3.4 Standard value of residual non-operating current (I ) . 35
∆no
5.3.5 Standard values of rated frequency . 35
5.3.6 Values of rated short-circuit capacity . 36
5.3.7 Minimum value of the rated residual making and breaking capacity
(I ) . 36
∆m
5.3.8 Limiting values of break time and non-actuating time for RCBO of
type AC and A . 36
5.3.9 Standard ranges of overcurrent instantaneous tripping . 37
5.3.10 Standard values of rated impulse withstand voltage (U ) . 38
imp
6 Marking and other product information. 38
7 Standard conditions for operation in service and for installation . 40
7.1 Standard conditions . 40
7.2 Conditions of installation . 41
7.3 Pollution degree . 41
8 Requirements for construction and operation . 41
8.1 Mechanical design . 41
8.1.1 General . 41
8.1.2 Mechanism . 42
8.1.3 Clearances and creepage distances (see also Annex B) . 43
8.1.4 Screws, current-carrying parts and connections . 46
8.1.5 Terminals for external conductors . 47
8.1.6 Non-interchangeability . 50
8.
...

IEC 61009-1 ®
Edition 3.1 2012-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Residual current operated circuit-breakers with integral overcurrent protection
for household and similar uses (RCBOs) –
Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de
protection contre les surintensités incorporé pour usages domestiques et
analogues (DD) –
Partie 1: Règles générales
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 la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office Tel.: [phone]
3, rue de Varembé Fax: [phone]
CH-1211 Geneva 20 [e-mail]
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.

Useful links:
IEC publications search - www.iec.ch/searchpub Electropedia - www.electropedia.org
The advanced search enables you to find IEC publications The world's leading online dictionary of electronic and
by a variety of criteria (reference number, text, technical electrical terms containing more than 30 000 terms and
committee,…). definitions in English and French, with equivalent terms in
It also gives information on projects, replaced and additional languages. Also known as the International
withdrawn publications. Electrotechnical Vocabulary (IEV) on-line.

IEC Just Published - webstore.iec.ch/justpublished Customer Service Centre - webstore.iec.ch/csc
Stay up to date on all new IEC publications. Just Published If you wish to give us your feedback on this publication
details all new publications released. Available on-line and or need further assistance, please contact the
also once a month by email. Customer Service Centre: [e-mail].

A propos de la CEI
La Commission Electrotechnique Internationale (CEI) 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 CEI
Le contenu technique des publications de la CEI est constamment revu. Veuillez vous assurer que vous possédez
l’édition la plus récente, un corrigendum ou amendement peut avoir été publié.

Liens utiles:
Recherche de publications CEI - www.iec.ch/searchpub Electropedia - www.electropedia.org
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IEC 61009-1 ®
Edition 3.1 2012-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Residual current operated circuit-breakers with integral overcurrent protection

for household and similar uses (RCBOs) –

Part 1: General rules
Interrupteurs automatiques à courant différentiel résiduel avec dispositif de

protection contre les surintensités incorporé pour usages domestiques et

analogues (DD) –
Partie 1: Règles générales
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CV
ICS 29.120.50 ISBN 978-2-8322-0083-4

– 2 – 61009-1  IEC:2010+A1:2012
CONTENTS
FOREWORD . 10
INTRODUCTION . 12

1 Scope . 13
2 Normative references . 15
3 Terms and definitions . 16
3.1 Definitions relating to currents flowing from live parts to earth . 16
3.2 Definitions relating to the energization of a residual current circuit-breaker . 16
3.3 Definitions relating to the operation and functions of residual current circuit-
breakers . 17
3.4 Definitions relating to values and ranges of energizing quantities . 20
3.5 Definitions relating to values and ranges of influencing quantities . 24
3.6 Definitions relating to terminals . 24
3.7 Definitions relating to conditions of operation . 26
3.8 Definitions relating to constructional elements . 27
3.9 Definitions relating to tests . 28
3.10 Definitions relating to insulation coordination . 28
4 Classification . 30
4.1 According to the method of operation . 30
4.1.1 RCBO functionally independent of line voltage (see 3.3.8) . 30
4.1.2 RCBO functionally dependent on line voltage (see 3.3.9) . 30
4.2 According to the type of installation . 31
4.3 According to the number of poles and current paths . 31
4.4 According to the possibility of adjusting the residual operating current . 31
4.5 According to resistance to unwanted tripping due to voltage surges . 31
4.6 According to behaviour in presence of d.c. components . 31
4.7 According to time-delay (in presence of a residual current) . 31
4.8 According to the protection against external influences . 31
4.9 According to the method of mounting . 32
4.10 According to the method of connection . 32
4.11 According to the instantaneous tripping current (see 3.4.18) . 32
4.12 According to the I²t characteristic . 32
4.13 According to the type of terminals . 32
5 Characteristics of RCBOs . 32
5.1 Summary of characteristics . 32
5.2 Rated quantities and other characteristics . 33
5.2.1 Rated voltage . 33
5.2.2 Rated current (I ) . 33
n
5.2.3 Rated residual operating current (I ) . 34
∆n
5.2.4 Rated residual non-operating current (I ) . 34
∆no
5.2.5 Rated frequency . 34
5.2.6 Rated short-circuit capacity (I ) . 34
cn
5.2.7 Rated residual making and breaking capacity (I ) . 34
∆m
5.2.8 RCBO type S . 34
5.2.9 Operating characteristics in case of residual currents with d.c.
components . 34

61009-1  IEC:2010+A1:2012 – 3 –
5.3 Standard and preferred values . 34
5.3.1 Preferred values of rated voltage (U ) . 34
n
5.3.2 Preferred values of rated current (I ) . 35
n
5.3.3 Standard values of rated residual operating current (I ) . 35
∆n
5.3.4 Standard value of residual non-operating current (I ) . 35
∆no
5.3.5 Standard values of rated frequency . 35
5.3.6 Values of rated short-circuit capacity . 36
5.3.7 Minimum value of the rated residual making and breaking capacity
(I ) . 36
∆m
5.3.8 Limiting values of break time and non-actuating time for RCBO of
type AC and A . 36
5.3.9 Standard ranges of overcurrent instantaneous tripping . 37
5.3.10 Standard values of rated impulse withstand voltage (U ) . 38
imp
6 Marking and other product information. 38
7 Standard conditions for operation in service and for installation . 40
7.1 Standard conditions . 40
7.2 Conditions of installation . 41
7.3 Pollution degree . 41
8 Requirements for construction and operation . 41
8.1 Mechanical design . 41
8.1.1 General . 41
8.1.2 Mechanism . 42
8.1.3 Clearances and creepage distances (see also Annex B) . 43
8.1.4 Screws, current-carrying parts and connections . 46
8.1.5 Terminals for external conductors . 47
8.1.6 Non-interchangeability . 50
8.2 Protection against electric shock . 50
8.3 Dielectric properties and isolating capability . 51
8.4 Temperature-rise . 51
8.4.1 Temperature-rise limits . 51
8.4.2 Ambient air temperature . 52
8.5 Operating characteristics . 52
8.5.1 Under residual current conditions . 52
8.5.2 Under overcurrent conditions . 52
8.6 Mechanical and electrical endurance .
...