IEC TR 60755:2008

General requirements for residual current operated protective devices

The requirements of this technical report apply to residual current operated protective devices (hereinafter referred to as "residual current devices" (RCD)) for rated voltages not exceeding 440 V a.c., intended primarily for protection against shock hazard. They are intended to be used by technical committees when drafting product standards and apply only if they are incorporated or are referred to in the relevant standards. This report is not intended to be used as a stand-alone standard, for example, for certification. IEC 60755 has been revised in order to align the previous version with the latest editions of IEC 61008, IEC 61009, IEC 62423 and IEC 60947-2. This second edition of IEC 60755 cancels and replaces the first edition published in 1983.

Exigences générales pour les dispositifs de protection à courant différentiel résiduel

Les exigences de ce présent rapport s'appliquent aux dispositifs de protection à courant différentiel résiduel (en abrégé " DDR " dans le texte) de tension assignée ne dépassant pas 440 V alternatifs, principalement destinés à la protection contre les chocs électriques. Elles sont destinées à être utilisées par les comités techniques lors de la rédaction des normes produit et s'appliquent uniquement si elles sont incorporées dans ou s'il y en est fait référence dans les normes appropriées. Ce rapport n'est pas destiné à être utilisé en tant que norme autonome, par exemple pour la certification. La CEI 60755 a été révisée en vue d'aligner la version précédente avec les dernières éditions des CEI 61008. CEI 61009, CEI 62423 et CEI 60947-2. Cette seconde édition de la CEI 60755 annule et remplace la première édition publiée en 1983.

General Information

• Status: Replaced
• Publication Date: 29-Jan-2008
• 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: DELPUB - Deleted Publication
• Completion Date: 02-Nov-2017

Relations

• Replaced By: IEC 60755:2017 - General safety requirements for residual current operated protective devices
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC/TR 60755
Edition 2.0 2008-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
General requirements for residual current operated protective devices

Exigences générales pour les dispositifs de protection à courant différentiel
résiduel
IEC/TR 60755:2008
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IEC/TR 60755
Edition 2.0 2008-01
TECHNICAL
REPORT
RAPPORT
TECHNIQUE
General requirements for residual current operated protective devices

Exigences générales pour les dispositifs de protection à courant différentiel
résiduel
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
W
CODE PRIX
ICS : 29.120.50 ISBN 2-8318-9577-4

– 2 – TR 60755 © IEC:2008
CONTENTS
FOREWORD.5

INTRODUCTION.7

1 Scope.8

2 Normative references .9

3 Terms and definitions .9
3.1 Definitions relating to currents flowing from live parts to earth .9
3.2 Definitions relating to the energization of a residual current device .10
3.3 Definitions relating to the operation and to the functions of the residual
current device .10
3.4 Definitions relating to values and ranges of energizing quantities .12
3.5 Definitions relating to values and ranges of influencing quantities .13
3.6 Conditions of operation .14
3.7 Test.15
3.8 short-circuit protective device (SCPD) .15
4 Classification.15
4.1 Classification according to the method of operation.15
4.2 Classification according to the type of installation.15
4.3 Classification according to the number of poles and current paths.15
4.4 Classification according to overcurrent protection.16
4.5 Classification according to the possibility of adjusting the residual operating
current .16
4.6 Classification according to resistance against unwanted tripping due to
current surges caused by impulse voltages .16
4.7 Classification of residual current devices according to their operating
characteristics in case of residual currents with d.c. components .16
4.8 Classification according to the range of ambient air temperature .16
4.9 Classification according to time-delay in presence of a residual current
exceeding I .16
Δn
4.10 Classification according to the method of construction.16
5 Characteristics of residual current devices .16

5.1 Summary of characteristics .16
5.2 Characteristics common to all residual current devices.17
5.3 Characteristics specific to residual current devices without integral
overcurrent protection (see 4.4a)) and to residual current devices with
integral overload protection only (see 4.4c)) .19
5.4 Preferred or standard values .19
6 Marking and other product information.23
7 Standard conditions for operation in service and for installation.24
7.1 Preferred ranges of application, reference values of influencing
quantities/factors and their associated test tolerances.24
7.2 Limits of extreme range of temperature during storage and transportation.25
8 Conditions for construction and operation.25
8.1 Information and marking.25
8.2 Mechanical design.26
8.3 Operating characteristics.27

TR 60755 © IEC:2008 – 3 –
8.4 Test device.29

8.5 Temperature rise.29

8.6 Resistance to humidity .30

8.7 Dielectric properties .30

8.8 Limiting value of non-operation in case of balanced load and unbalanced

load.30

8.9 EMC compliance and unwanted tripping .30

8.10 Behaviour of residual current devices in case of overcurrent conditions .30

8.11 Resistance of the insulation against impulse voltages .30

8.12 Mechanical and electrical endurance.30

8.13 Resistance to mechanical shock.31
8.14 Reliability .31
8.15 Condition for reclosing a reset residual current device (3.3.13) .31
8.16 Protection against electric shock .31
8.17 Resistance to heat .31
8.18 Resistance to abnormal heat and to fire .31
8.19 Behaviour of residual current device within ambient temperature range.31
8.20 Behaviour of residual current device after exposure to extreme temperatures
during storage and transportation .32
9 Guidance for type tests.32
Annex A (informative) .33
Annex B.36
Bibliography.38

Figure A.1 – Diagram for all the short-circuit tests .34
Figure A.2 – Detail of impedance Z or Z .35
Figure B.1 – Possible load and fault currents according to the different electronic
circuits.36

Table 1 – Standard values of maximum break time of non-time-delay type RCDs for
a.c. residual current .21
Table 2 – Standard values of maximum break time of non-time-delay type RCDs for
half-wave pulsating d.c. residual current .21
Table 3 – Standard values of maximum break time of non-time-delay type RCDs for
residual direct currents which result from rectifying circuits and/or smooth d.c. residual

current .21
Table 4 – Acceptable alternative standard values of maximum break times for RCD
with a rated residual current of 6mA and non-time-delay type intended to be used in
bi-phase system 120V with middle point .21
Table 5 – Standard values of break time for a.c. residual current for time-delay type
residual current devices .22
Table 6 – Standard values of break time for pulsating d.c. residual current for time-
delay type residual current devices .22
Table 7 – Standard value
...