IEC 62020-1:2020

IEC 62020-1 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical accessories – Residual current monitors (RCMs) –
Part 1: RCMs for household and similar uses

Petit appareillage électrique – Contrôleurs d'isolement à courant différentiel
résiduel (RCM) –
Partie 1: RCM pour usages domestiques et analogues

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IEC 62020-1 ®
Edition 1.0 2020-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Electrical accessories – Residual current monitors (RCMs) –

Part 1: RCMs for household and similar uses

Petit appareillage électrique – Contrôleurs d'isolement à courant différentiel

résiduel (RCM) –
Partie 1: RCM pour usages domestiques et analogues

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.50 ISBN 978-2-8322-8145-1

– 2 – IEC 62020-1:2020 © IEC 2020
CONTENTS
FOREWORD . 8
INTRODUCTION . 10
1 Scope . 11
2 Normative references . 12
3 Terms and definitions . 13
4 Classification . 15
4.1 According to the method of operation . 15
4.1.1 RCM functionally dependent on line voltage . 15
4.1.2 RCM functionally dependent on an energy source other than line
voltage . 15
4.2 According to the type of installation . 15
4.3 According to the number of current paths . 15
4.4 According to the ability to adjust the residual operating current . 15
4.5 According to the possibility of adjusting the time-delay . 15
4.6 According to the protection against external influences . 15
4.7 According to the method of mounting . 15
4.8 According to the method of connection . 15
4.9 According to the type of connection of the load conductors . 15
4.9.1 RCM to which the monitored line is not directly connected . 15
4.9.2 RCM to which the monitored line is directly connected. 16
4.10 According to fault indicating means . 16
4.11 According to ability to directionally discriminate between supply-side and
load-side residual currents . 16
4.12 According to the supply system . 16
4.12.1 RCM for use in AC supply systems . 16
4.12.2 RCM for use in DC supply systems . 16
4.13 According to the type of residual current monitored. 16
4.14 According to the method of residual current detection . 16
5 Characteristics of RCMs . 16
5.1 Summary of characteristics . 16
5.2 Rated quantities and other characteristics. 17
5.2.1 Rated voltage . 17
5.2.2 Rated current (I ) . 17
n
5.2.3 Rated residual operating current (I ) . 17
Δn
5.2.4 Rated residual non-operating current (I ) . 18
Δno
5.2.5 Rated frequency . 18
5.2.6 Operating characteristics . 18
5.3 Standard and preferred values . 18
5.3.1 Preferred values of rated voltage (U ) . 18
e
5.3.2 Preferred values of rated current (I ) . 19
n
5.3.3 Preferred values of rated residual operating current (I ) . 19
Δn
5.3.4 Standard value of residual non-operating current (I ) . 19
Δno
5.3.5 Standard minimum value of the non-operating overcurrent in the case of
single-phase load through an RCM . 19
5.3.6 Preferred values of rated frequency . 19
5.3.7 Standard and preferred values of the rated conditional short-circuit
current (I ) (only applicable to RCMs classified according to 4.9.2) . 19
nc
5.3.8 Maximum actuating time (T ) . 20
max
5.3.9 Minimum non-actuating time (T ) . 20
min
5.4 Coordination with short-circuit protective devices (SCPDs) (only valid for
RCMs classified according to 4.9.2) . 20
5.4.1 General . 20
5.4.2 Rated conditional short-circuit current (I ) . 20
nc
5.4.3 Rated conditional residual short-circuit current (I ) . 20
Δc
6 Marking and other product information . 20
7 Standard conditions for operation in service and for installation . 23
7.1 Standard conditions . 23
7.2 Conditions of installation . 24
8 Requirements for construction and operation . 24
8.1 Mechanical design . 24
8.1.1 General . 24
8.1.2 Features . 24
8.1.3 Clearances and creepage distances . 25
8.1.4 Screws, current-carrying parts and connections . 26
8.1.5 Terminals for external conductors . 27
8.2 Protection against electric shock . 29
8.3 Dielectric properties . 30
8.4 Temperature rise . 30
8.4.1 General . 30
8.4.2 Temperature rise limits . 30
8.4.3 Ambient air temperature . 31
8.5 Operating characteristic . 31
8.6 Directional discrimination . 31
8.7 Operational endurance . 31
8.8 Performance at short-circuit currents . 31
8.9 Resistance to mechanical impact . 31
8.10 Resistance to heat .
...