Electrical accessories - Residual current monitors (RCMs) - Part 1: RCMs for household and similar uses

IEC 62020-1:2020 applies to residual current monitors for household and similar purposes, having rated operational voltages and a rated voltage of the monitored circuit not exceeding 440 V AC and rated currents not exceeding 125 A.
This first edition cancels and replaces IEC 62020:1998 and IEC 62020:1998/AMD1:2003. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
– definition of Type F and Type B RCM;
– marking of Type F and Type B RCM;
– introduction of a new subclause,  REF _Ref521411992 \r \h \* MERGEFORMAT 8.20 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310031003900390032000000 ;
– modification of  REF _Ref521412027 \r \h \* MERGEFORMAT 9.7 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000320037000000 ;
– update of  REF _Ref521412044 \r \h \* MERGEFORMAT 9.9 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000340034000000 ;
– modification of  REF _Ref521412054 \r \h \* MERGEFORMAT 9.14 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000350034000000 ;
– modification of  REF _Ref521412067 \r \h \* MERGEFORMAT 9.19 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000360037000000 , for introduction of the relevant test for Type F and Type B RCM.
The contents of the corrigendum of July 2020 have been included in this copy.

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

L'IEC 62020-1:2020 s'applique aux contrôleurs d'isolement à courant différentiel résiduel pour usages domestiques et analogues, avec des tensions d'emploi assignées et une tension assignée du circuit surveillé ne dépassant pas 440 V en courant alternatif et des courants assignés ne dépassant pas 125 A.
Cette première édition annule et remplace l'IEC 62020:1998 et l'IEC 62020:1998/AMD1:2003. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
– définitions des RCM de type F et de type B;
– marquage des RCM de type F et de type B;
– ajout d'un nouveau paragraphe,  REF _Ref521411992 \r \h \* MERGEFORMAT 8.20 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310031003900390032000000 ;
– modification du  REF _Ref521412027 \r \h \* MERGEFORMAT 9.7 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000320037000000 ;
– mise à jour du  REF _Ref521412044 \r \h \* MERGEFORMAT 9.9 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000340034000000 ;
– modification du  REF _Ref521412054 \r \h \* MERGEFORMAT 9.14 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000350034000000 ;
– modification du  REF _Ref521412067 \r \h \* MERGEFORMAT 9.19 08D0C9EA79F9BACE118C8200AA004BA90B02000000080000000E0000005F005200650066003500320031003400310032003000360037000000  afin d'ajouter l'essai concernant les RCM de type F et de type B.
Le contenu du corrigendum de juillet 2020 a été pris en considération dans cet exemplaire.

General Information

Status
Published
Publication Date
20-Apr-2020
Current Stage
PPUB - Publication issued
Completion Date
21-Apr-2020
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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
IEC 62020-1:2020-04(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
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

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 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

5.2.3 Rated residual operating current (I ) ........................................................... 17

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

5.3.2 Preferred values of rated current (I ) ............................................................. 19

5.3.3 Preferred values of rated residual operating current (I ) .............................. 19

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

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IEC 62020-1:2020 © IEC 2020 – 3 –

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

5.4.3 Rated conditional residual short-circuit current (I ) ...................................... 20

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 ................................................................................................ 32

8.11 Resistance to abnormal heat and to fire ................................................................ 32

8.12 Test device ........................................................................................................... 32

8.13 Correct operation of RCMs within the supply voltage range................................... 32

8.14 Behaviour of RCMs in case of overcurrents in the main circuit .............................. 32

8.15 Resistance of RCMs to unwanted initiating of an alarm due to current surges

caused by impulse voltages .................................................................................. 33

8.16 Behaviour of RCMs in case of earth fault currents comprising DC

components .......................................................................................................... 33

8.17 Reliability .............................................................................................................. 33

8.18 Electromagnetic compatibility (EMC) ..................................................................... 33

8.18.1 General ......................................................................................................... 33

8.18.2 Immunity requirements .................................................................................. 33

8.18.3 Emission requirements .................................................................................. 33

8.19 Connection of an external current transformer (CT) .............................................. 33

8.20 Response to temporary overvoltages on the LV side due to fault conditions

on the HV side ...................................................................................................... 33

9 Tests ............................................................................................................................. 34

9.1 General ................................................................................................................. 34

9.2 Test conditions ..................................................................................................... 35

---------------------- Page: 5 ----------------------
– 4 – IEC 62020-1:2020 © IEC 2020

9.3 Test of indelibility of marking ................................................................................ 35

9.4 Test of reliability of screws, current-carrying parts and connections ...................... 36

9.5 Test of reliability of terminals for external conductors ............................................ 37

9.6 Verification of protection against electric shock ..................................................... 38

9.7 Test of dielectric properties ................................................................................... 39

9.7.1 Resistance to humidity................................................................................... 39

9.7.2 Insulation resistance of the main circuits of RCMs classified according

to 4.9.2 .......................................................................................................... 39

9.7.3 Dielectric strength of the main circuit of RCMs classified according to

4.9.2 .............................................................................................................. 40

9.7.4 Insulation resistance and dielectric strength of control and auxiliary

circuits ........................................................................................................... 41

9.7.5 Secondary circuit of detection transformers ................................................... 42

9.7.6 Capability of the RCM to withstand high DC voltages due to insulation

measurements ............................................................................................... 42

9.7.7 Verification of impulse withstand voltages ...................................................... 42

9.8 Test of temperature rise ........................................................................................ 44

9.8.1 Ambient air temperature ................................................................................ 44

9.8.2 Test procedure .............................................................................................. 44

9.8.3 Measurement of the temperature rise of parts ................................................ 45

9.8.4 Temperature rise of a part ............................................................................. 45

9.9 Verification of the operating characteristics ........................................................... 45

9.9.1 Test circuit ..................................................................................................... 45

9.9.2 Off-load tests with residual sinusoidal alternating currents at the

reference temperature of 20 °C ± 2 °C ........................................................... 45

9.9.3 Verification of the correct operation with load at the reference

temperature ................................................................................................... 46

9.9.4 Verification of the connection and the function of an external current

transformer (CT) ............................................................................................ 46

9.9.5 Verification of directional discrimination for RCMs classified according

to 4.11 ........................................................................................................... 47

9.10 Verification of operational endurance .................................................................... 48

9.10.1 General ......................................................................................................... 48

9.10.2 Test procedure .............................................................................................. 48

9.11 Verification of short-circuit withstand capability ..................................................... 48

9.11.1 List of the short-circuit tests ........................................................................... 48

9.11.2 Short-circuit tests .......................................................................................... 48

9.12 Verification of resistance to mechanical impact ..................................................... 53

9.12.1 General ......................................................................................................... 53

9.12.2 Test for all RCM types ................................................................................... 53

9.12.3 Rail-mounted RCMs ....................................................................................... 55

9.12.4 Plug-in type RCMs ......................................................................................... 55

9.13 Test of resistance to heat ...................................................................................... 55

9.14 Test of resistance to abnormal heat and to fire ..................................................... 56

9.15 Verification of the operation of the test device at the limits of rated voltage........... 57

9.16 Verification of limiting values of the non-operating current under overcurrent

conditions ............................................................................................................. 57

9.16.1 General ......................................................................................................... 57

9.16.2 Verification of the limiting value of overcurrent in the case of a load

through an RCM with two current paths ......................................................... 57

---------------------- Page: 6 ----------------------
IEC 62020-1:2020 © IEC 2020 – 5 –

9.16.3 Verification of the limiting value of overcurrent in the case of a single-

phase load through a three-pole or four-pole RCM ......................................... 58

9.16.4 Verification of the limiting value of overcurrent in the case of a single-

phase load through an RCM with an external detecting device

(transformer) ................................................................................................. 58

9.17 Verification of resistance against unwanted operation due to current surges

caused by impulse voltages .................................................................................. 59

9.18 Void ...................................................................................................................... 59

9.19 Additional verification of the correct operation at residual currents with DC

components .......................................................................................................... 59

9.19.1 General ......................................................................................................... 59

9.19.2 Verification of the correct operation for RCM Type A, Type F and

Type B ........................................................................................................... 61

9.19.3 Verification of correct operation for RCM Type F and Type B ......................... 62

9.19.4 Verification of correct operation for RCM Type B ........................................... 63

9.20 Verification of reliability ......................................................................................... 66

9.20.1 General ......................................................................................................... 66

9.20.2 Climatic test .................................................................................................. 66

9.20.3 Test with temperature of 40 °C ...................................................................... 68

9.21 Verification of ageing of electronic components .................................................... 68

9.22 Verification of EMC requirements .......................................................................... 68

9.22.1 General ......................................................................................................... 68

9.22.2 Description of quiescent mode and operate mode .......................................... 70

9.22.3 Criterion A1 ................................................................................................... 70

9.22.4 Criterion A2 ................................................................................................... 70

9.22.5 Criterion B ..................................................................................................... 70

9.23 Response of the RCM to temporary overvoltages on the LV side, due to fault

conditions on the HV side ..................................................................................... 71

9.24 Test of resistance to rusting .................................................................................. 71

Annex A (normative) Test sequence and number of samples to be submitted for

verification of conformity to this document .......................................................................... 102

A.1 General ............................................................................................................... 102

A.2 Test sequences .................................................................................................. 102

A.3 Number of samples to be submitted for full test procedure .................................. 103

A.4 Number of samples to be submitted for simplified test procedures in case of

submitting simultaneously a range of RCMs of the same fundamental design ..... 103

Annex B (normative) Determination of clearances and creepage distances ........................ 106

Bibliography ........................................................................................................................ 109

Figure 1 – Standing current in FE conductor ......................................................................... 72

Figure 2 – Standard test finger (9.6) ..................................................................................... 73

Figure 3 – Test circuit for verification of the operating characteristics for RCMs .................... 74

Figure 4 – Test circuit for verification of directional discrimination in IT systems for

RCMs classified according to 4.12 ........................................................................................ 75

Figure 5 – Test circuit for verification of the correct operation of RCMs in the case of

residual pulsating direct currents .......................................................................................... 76

Figure 6 – Test circuit for verification of the correct operation of RCMs in the case of

residual pulsating direct currents superimposed by smooth direct current of 0,006 A ............ 78

Figure 7 – Test circuit for verification of the coordination with an SCPD of an RCM with

two current paths (9.11) ........................................................................................................ 79

---------------------- Page: 7 ----------------------
– 6 – IEC 62020-1:2020 © IEC 2020

Figure 8 – Test circuit for verification of the coordination with an SCPD of an RCM with

three current paths in a three-phase circuit (9.11) ................................................................. 80

Figure 9 – Test circuit for verification of the coordination with an SCPD of an RCM with

four current paths on a three-phase circuit with neutral (9.11) ............................................... 81

Figure 10 – Test apparatus for verification of the minimum I t and I values to be

withstood by the RCM (9.11.2.1 a)) ....................................................................................... 82

Figure 11 – Mechanical impact test apparatus (9.12.2) ......................................................... 83

Figure 12 – Striking element for pendulum impact test apparatus (9.12.2) ............................ 84

Figure 13 – Mounting support for sample for mechanical impact test (9.12.2) ....................... 85

Figure 14 – Example of mounting an unenclosed RCM for mechanical impact test

(9.12.2) ................................................................................................................................. 86

Figure 15 – Example of mounting of panel mounting type RCM for the mechanical

impact test (9.12.2) ............................................................................................................... 87

Figure 16 – Application of force for mechanical test of rail-mounted RCM (9.12.3) ................ 88

Figure 17 – Ball-pressure test apparatus (9.13.3) ................................................................. 88

Figure 18 – Test circuit for verification of the limiting value of overcurrent in the case of

single-phase load ......................................
...

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